CovidV2, Pmc, Corpus, bibRecord, 000235

Human PBMC-transferred murine MHC class I/II-deficient NOG mice enable long-term evaluation of human immune responses

Identifieur interne : 000235 ( Pmc/Corpus ); précédent : 000234; suivant : 000236

Human PBMC-transferred murine MHC class I/II-deficient NOG mice enable long-term evaluation of human immune responses

Auteurs : Tomonori Yaguchi ; Asuka Kobayashi ; Takashi Inozume ; Kenji Morii ; Haruna Nagumo ; Hiroshi Nishio ; Takashi Iwata ; Yuyo Ka ; Ikumi Katano ; Ryoji Ito ; Mamoru Ito ; Yutaka Kawakami

Source :

Cellular and Molecular Immunology [ 1672-7681 ] ; 2017.

RBID : PMC:6207709

Abstract

Immunodeficient mice engrafted with human peripheral blood cells are promising tools for in vivo analysis of human patient individual immune responses. However, when human peripheral blood mononuclear cells (PBMCs) are transferred into NOG (NOD/Shi-scid, IL-2rg^null) mice, severe graft versus host disease (GVHD) hinders long term detailed analysis. Administration of human PBMCs into newly developed murine MHC class I- and class II-deficient NOG (NOG-dKO; NOG- Iab, B2m-double-knockout) mice showed sufficient engraftment of human immune cells with little sign of GVHD. Immunization with influenza vaccine resulted in an increase in influenza-specific human IgG Ab, indicating induction of antigen-specific B cells in the NOG-dKO mice. Immunization with human dendritic cells pulsed with HLA-A2 restricted cytomegalovirus peptide induced specific cytotoxic T cells, indicating the induction of antigen-specific T cells in the NOG-dKO mice. Adoptive cell therapies (ACTs) using melanoma antigen recognized by T cells (MART-1)-specific TCR-transduced activated T cells showed strong tumor growth inhibition in NOG-dKO mice without any sign of GVHD accompanied by preferential expansion of the transferred MART-1-specific T cells. ACTs using cultured human melanoma infiltrating T cells also showed anti-tumor effects against autologous melanoma cells in NOG-dKO mice, in which changes in human cancer phenotypes by immune intervention, such as increased CD271 expression, could be evaluated. Therefore, NOG-dKO mice are useful tools for more detailed analysis of both the induction and effector phases of T-cell and B-cell responses for a longer period than regular NOG mice.

Url:

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6207709

DOI: 10.1038/cmi.2017.106
PubMed: 29151581
PubMed Central: 6207709

Links to Exploration step

PMC:6207709

Le document en format XML

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<author><name sortKey="Kobayashi, Asuka" sort="Kobayashi, Asuka" uniqKey="Kobayashi A" first="Asuka" last="Kobayashi">Asuka Kobayashi</name>
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<author><name sortKey="Nagumo, Haruna" sort="Nagumo, Haruna" uniqKey="Nagumo H" first="Haruna" last="Nagumo">Haruna Nagumo</name>
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<author><name sortKey="Ito, Mamoru" sort="Ito, Mamoru" uniqKey="Ito M" first="Mamoru" last="Ito">Mamoru Ito</name>
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<author><name sortKey="Kawakami, Yutaka" sort="Kawakami, Yutaka" uniqKey="Kawakami Y" first="Yutaka" last="Kawakami">Yutaka Kawakami</name>
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<series><title level="j">Cellular and Molecular Immunology</title>
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<front><div type="abstract" xml:lang="en"><p id="Par2">Immunodeficient mice engrafted with human peripheral blood cells are promising tools for <italic>in vivo</italic>
 analysis of human patient individual immune responses. However, when human peripheral blood mononuclear cells (PBMCs) are transferred into NOG (NOD/Shi-scid, <italic>IL-2rg</italic>
<sup><italic>null</italic>
</sup>
) mice, severe graft versus host disease (GVHD) hinders long term detailed analysis. Administration of human PBMCs into newly developed murine MHC class I- and class II-deficient NOG (NOG-dKO; NOG- Iab, B2m-double-knockout) mice showed sufficient engraftment of human immune cells with little sign of GVHD. Immunization with influenza vaccine resulted in an increase in influenza-specific human IgG Ab, indicating induction of antigen-specific B cells in the NOG-dKO mice. Immunization with human dendritic cells pulsed with HLA-A2 restricted cytomegalovirus peptide induced specific cytotoxic T cells, indicating the induction of antigen-specific T cells in the NOG-dKO mice. Adoptive cell therapies (ACTs) using melanoma antigen recognized by T cells (MART-1)-specific TCR-transduced activated T cells showed strong tumor growth inhibition in NOG-dKO mice without any sign of GVHD accompanied by preferential expansion of the transferred MART-1-specific T cells. ACTs using cultured human melanoma infiltrating T cells also showed anti-tumor effects against autologous melanoma cells in NOG-dKO mice, in which changes in human cancer phenotypes by immune intervention, such as increased CD271 expression, could be evaluated. Therefore, NOG-dKO mice are useful tools for more detailed analysis of both the induction and effector phases of T-cell and B-cell responses for a longer period than regular NOG mice.</p>
</div>
</front>
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<pmc article-type="research-article"><pmc-dir>properties open_access</pmc-dir>
  <front><journal-meta><journal-id journal-id-type="nlm-ta">Cell Mol Immunol</journal-id>
<journal-id journal-id-type="iso-abbrev">Cell. Mol. Immunol</journal-id>
<journal-title-group><journal-title>Cellular and Molecular Immunology</journal-title>
</journal-title-group>
<issn pub-type="ppub">1672-7681</issn>
<issn pub-type="epub">2042-0226</issn>
<publisher><publisher-name>Nature Publishing Group UK</publisher-name>
<publisher-loc>London</publisher-loc>
</publisher>
</journal-meta>
<article-meta><article-id pub-id-type="pmid">29151581</article-id>
<article-id pub-id-type="pmc">6207709</article-id>
<article-id pub-id-type="publisher-id">113</article-id>
<article-id pub-id-type="doi">10.1038/cmi.2017.106</article-id>
<article-categories><subj-group subj-group-type="heading"><subject>Article</subject>
</subj-group>
</article-categories>
<title-group><article-title>Human PBMC-transferred murine MHC class I/II-deficient NOG mice enable long-term evaluation of human immune responses</article-title>
</title-group>
<contrib-group><contrib contrib-type="author" equal-contrib="yes"><name><surname>Yaguchi</surname>
<given-names>Tomonori</given-names>
</name>
<xref ref-type="aff" rid="Aff1">1</xref>
</contrib>
<contrib contrib-type="author" equal-contrib="yes"><name><surname>Kobayashi</surname>
<given-names>Asuka</given-names>
</name>
<xref ref-type="aff" rid="Aff1">1</xref>
</contrib>
<contrib contrib-type="author"><name><surname>Inozume</surname>
<given-names>Takashi</given-names>
</name>
<xref ref-type="aff" rid="Aff2">2</xref>
</contrib>
<contrib contrib-type="author"><name><surname>Morii</surname>
<given-names>Kenji</given-names>
</name>
<xref ref-type="aff" rid="Aff1">1</xref>
</contrib>
<contrib contrib-type="author"><name><surname>Nagumo</surname>
<given-names>Haruna</given-names>
</name>
<xref ref-type="aff" rid="Aff1">1</xref>
</contrib>
<contrib contrib-type="author"><name><surname>Nishio</surname>
<given-names>Hiroshi</given-names>
</name>
<xref ref-type="aff" rid="Aff1">1</xref>
<xref ref-type="aff" rid="Aff3">3</xref>
</contrib>
<contrib contrib-type="author"><name><surname>Iwata</surname>
<given-names>Takashi</given-names>
</name>
<xref ref-type="aff" rid="Aff1">1</xref>
<xref ref-type="aff" rid="Aff3">3</xref>
</contrib>
<contrib contrib-type="author"><name><surname>Ka</surname>
<given-names>Yuyo</given-names>
</name>
<xref ref-type="aff" rid="Aff4">4</xref>
</contrib>
<contrib contrib-type="author"><name><surname>Katano</surname>
<given-names>Ikumi</given-names>
</name>
<xref ref-type="aff" rid="Aff4">4</xref>
</contrib>
<contrib contrib-type="author"><name><surname>Ito</surname>
<given-names>Ryoji</given-names>
</name>
<xref ref-type="aff" rid="Aff4">4</xref>
</contrib>
<contrib contrib-type="author"><name><surname>Ito</surname>
<given-names>Mamoru</given-names>
</name>
<xref ref-type="aff" rid="Aff4">4</xref>
</contrib>
<contrib contrib-type="author" corresp="yes"><name><surname>Kawakami</surname>
<given-names>Yutaka</given-names>
</name>
<address><email>yutakawa@keio.jp</email>
<email>beatless@rr.iij4u.or.jp</email>
</address>
<xref ref-type="aff" rid="Aff1">1</xref>
</contrib>
<aff id="Aff1"><label>1</label>
<institution-wrap><institution-id institution-id-type="ISNI">0000 0004 1936 9959</institution-id>
<institution-id institution-id-type="GRID">grid.26091.3c</institution-id>
<institution>Division of Cellular Signaling, Institute for Advanced Medical Research,</institution>
<institution>Keio University School of Medicine,</institution>
</institution-wrap>
Tokyo 160-8582, Japan</aff>
<aff id="Aff2"><label>2</label>
<institution-wrap><institution-id institution-id-type="ISNI">0000 0001 0291 3581</institution-id>
<institution-id institution-id-type="GRID">grid.267500.6</institution-id>
<institution>Department of Dermatology,</institution>
<institution>Yamanashi University School of Medicine,</institution>
</institution-wrap>
Yamanashi 409-3898, Japan</aff>
<aff id="Aff3"><label>3</label>
<institution-wrap><institution-id institution-id-type="ISNI">0000 0004 1936 9959</institution-id>
<institution-id institution-id-type="GRID">grid.26091.3c</institution-id>
<institution>Department of Obstetrics and Gynecology,</institution>
<institution>Keio University School of Medicine,</institution>
</institution-wrap>
Tokyo 160-8582, Japan</aff>
<aff id="Aff4"><label>4</label>
<institution-wrap><institution-id institution-id-type="ISNI">0000 0004 0376 978X</institution-id>
<institution-id institution-id-type="GRID">grid.452212.2</institution-id>
<institution>Central Institute for Experimental Animals,</institution>
</institution-wrap>
Kanagawa 210-0821, Japan</aff>
</contrib-group>
<pub-date pub-type="epub"><day>20</day>
<month>11</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="ppub"><month>11</month>
<year>2018</year>
</pub-date>
<volume>15</volume>
<issue>11</issue>
<fpage>953</fpage>
<lpage>962</lpage>
<history><date date-type="received"><day>9</day>
<month>2</month>
<year>2017</year>
</date>
<date date-type="rev-recd"><day>5</day>
<month>9</month>
<year>2017</year>
</date>
<date date-type="accepted"><day>6</day>
<month>9</month>
<year>2017</year>
</date>
</history>
<permissions><copyright-statement>© The Chinese Society of Immunology and The University of Science and Technology of China, All rights reserved 2017</copyright-statement>
<license><license-p>This article is made available via the PMC Open Access Subset for unrestricted research re-use and secondary analysis in any form or by any means with acknowledgement of the original source. These permissions are granted for the duration of the World Health Organization (WHO) declaration of COVID-19 as a global pandemic.</license-p>
</license>
</permissions>
<abstract id="Abs1"><p id="Par2">Immunodeficient mice engrafted with human peripheral blood cells are promising tools for <italic>in vivo</italic>
 analysis of human patient individual immune responses. However, when human peripheral blood mononuclear cells (PBMCs) are transferred into NOG (NOD/Shi-scid, <italic>IL-2rg</italic>
<sup><italic>null</italic>
</sup>
) mice, severe graft versus host disease (GVHD) hinders long term detailed analysis. Administration of human PBMCs into newly developed murine MHC class I- and class II-deficient NOG (NOG-dKO; NOG- Iab, B2m-double-knockout) mice showed sufficient engraftment of human immune cells with little sign of GVHD. Immunization with influenza vaccine resulted in an increase in influenza-specific human IgG Ab, indicating induction of antigen-specific B cells in the NOG-dKO mice. Immunization with human dendritic cells pulsed with HLA-A2 restricted cytomegalovirus peptide induced specific cytotoxic T cells, indicating the induction of antigen-specific T cells in the NOG-dKO mice. Adoptive cell therapies (ACTs) using melanoma antigen recognized by T cells (MART-1)-specific TCR-transduced activated T cells showed strong tumor growth inhibition in NOG-dKO mice without any sign of GVHD accompanied by preferential expansion of the transferred MART-1-specific T cells. ACTs using cultured human melanoma infiltrating T cells also showed anti-tumor effects against autologous melanoma cells in NOG-dKO mice, in which changes in human cancer phenotypes by immune intervention, such as increased CD271 expression, could be evaluated. Therefore, NOG-dKO mice are useful tools for more detailed analysis of both the induction and effector phases of T-cell and B-cell responses for a longer period than regular NOG mice.</p>
</abstract>
<kwd-group xml:lang="en"><title>Keywords</title>
<kwd>adoptive cell therapy</kwd>
<kwd>humanized mouse</kwd>
<kwd>vaccine</kwd>
</kwd-group>
<custom-meta-group><custom-meta><meta-name>issue-copyright-statement</meta-name>
<meta-value>© The Chinese Society of Immunology and The University of Science and Technology of China, All rights reserved 2018</meta-value>
</custom-meta>
</custom-meta-group>
</article-meta>
</front>
<body><sec id="Sec1" sec-type="introduction"><title>Introduction</title>
<p id="Par3">Human <italic>in vivo</italic>
 immune responses are often presumed from mouse models because <italic>in vivo</italic>
 study of human biology is limited by ethical and technical problems. However, there are significant differences between humans and mice, such as T-cell and B-cell signaling pathway components, Th1/Th2 differentiation, Toll-like receptors and cytokines and their receptors.<sup><xref ref-type="bibr" rid="CR1">1</xref>
</sup>
 To overcome these problems, various humanized mice in which the human immune system can be studied <italic>in vivo</italic>
 have been recently developed. The most commonly used humanized mouse models are immunodeficient <italic>Il2rγ</italic>
<sup><italic>null</italic>
</sup>
 mouse strains, such as NOG (NOD/Shi-<italic>Prkdc</italic>
<sup><italic>scid</italic>
</sup>
<italic>Il2rγ</italic>
<sup><italic>tm1Sug</italic>
</sup>
/Jic) mice<sup><xref ref-type="bibr" rid="CR2">2</xref>
</sup>
 or NSG (NOD/LtSz-<italic>Prkdc</italic>
<sup><italic>scid</italic>
</sup>
<italic>Il2rγ</italic>
<sup><italic>tm1Wjl</italic>
</sup>
/J) mice<sup><xref ref-type="bibr" rid="CR3">3</xref>
</sup>
 engrafted with human tissues, human hematopoietic cells (HSCs) or human peripheral blood mononuclear cells (PBMCs), in which human immune cells can be analyzed.</p>
<p id="Par4">In conventional human HSC-engrafted NOG/NSG mice, human multi-lineage hematopoietic cells, including both lymphoid cells and myeloid cells, are developed from transplanted human HSCs,<sup><xref ref-type="bibr" rid="CR4">4</xref>
</sup>
 and these mice are widely used for human immunology research. However, these humanized mice are still insufficient because the developed human cells are not fully functional. For example, although immunization of these humanized mice with antigens leads to the production of antigen-specific IgM, antigen-specific IgG responses are very weak.<sup><xref ref-type="bibr" rid="CR5">5</xref>
,<xref ref-type="bibr" rid="CR6">6</xref>
</sup>
 T-cell differentiation, such as generation of CD4 and CD8 single-positive T cells, seems to be relatively normal in these humanized mice.<sup><xref ref-type="bibr" rid="CR5">5</xref>
,<xref ref-type="bibr" rid="CR7">7</xref>
</sup>
 However, the function of these T cells, especially induction of antigen-specific T-cell responses, remains controversial.<sup><xref ref-type="bibr" rid="CR4">4</xref>
</sup>
 One of the reasons is thought to be mismatches between mouse MHC and HLA of donor human HSCs. To overcome these issues, new immunodeficient <italic>Il2rγ</italic>
<sup><italic>null</italic>
</sup>
 mouse strains that express human HLA class I or class II molecules were generated and showed HLA-restricted antigen-specific CTL responses<sup><xref ref-type="bibr" rid="CR8">8</xref>
</sup>
 or antigen-specific IgG responses.<sup><xref ref-type="bibr" rid="CR9">9</xref>
</sup>
</p>
<p id="Par5">Although these HSC-engrafted humanized mice have improved our understanding of <italic>in vivo</italic>
 human immune cell development and functions,<sup><xref ref-type="bibr" rid="CR10">10</xref>
</sup>
 these mice could not reconstruct the current immune status of human individuals, including patients, because all of the human hematopoietic cells were reconstituted from HSCs. In particular, analyzing the association of T cells and autologous tissues, including cancer cells, in HSC-engrafted humanized mice is nearly impossible because it is difficult to obtain HSCs and tissues from the same patient.</p>
<p id="Par6">Human PBMC-engrafted humanized mice are attractive models for <italic>in vivo</italic>
 analysis of individual human patient immune responses. We previously reported that human PBMCs could be engrafted in NOG mice much better than in other immunodeficient mice.<sup><xref ref-type="bibr" rid="CR11">11</xref>
</sup>
 However, because of severe xenogeneic graft versus host disease (xeno-GVHD) in these mice, there is a limited window for experimentation. All the engrafted T cells are activated by xeno-GVHD, and all the mice die of xeno-GVHD, which makes it difficult to analyze human immune responses precisely. Previously, murine class I MHC and class II MHC-knockout NSG mice were developed and analyzed for xeno-GVHD,<sup><xref ref-type="bibr" rid="CR12">12</xref>
</sup>
 but the phenotypes and immune responses of transferred human PBMCs have not been clearly evaluated yet.</p>
<p id="Par7">In this study, to overcome xeno-GVHD problems in the use of human PBMC-engrafted humanized mice that confound induced human immune responses, we have developed murine MHC class I- and class II-deficient NOG mice and analyzed whether these mice engrafted with human PBMCs could be useful tools for analysis of both the induction and effector phases of human T-cell and B-cell responses.</p>
</sec>
<sec id="Sec2" sec-type="materials|methods"><title>Materials and methods</title>
<sec id="Sec3"><title>Mice</title>
<p id="Par8">NOD.Cg-<italic>Prkdc</italic>
<sup><italic>scid</italic>
</sup>
<italic>Il2rg</italic>
<sup><italic>tm1Sug</italic>
</sup>
/Jic (NOD-<italic>scid IL-2rg</italic>
<sup><italic>null</italic>
</sup>
: NOG) and NOD.Cg-<italic>Prkdc</italic>
<sup><italic>scid</italic>
</sup>
<italic>Il2rg</italic>
<sup><italic>tm1Sug</italic>
</sup>
<italic>H2-Ab1</italic>
<sup><italic>tm1Doi</italic>
</sup>
<italic>B2m</italic>
<sup><italic>tm1Unc</italic>
</sup>
 /Jic (NOG-Iab<sup><italic>null</italic>
</sup>
 B2m<sup><italic>null</italic>
</sup>
: NOG-dKO) mice were used in this study. NOG mice were established as previously reported.<sup><xref ref-type="bibr" rid="CR2">2</xref>
</sup>
 NOG-dKO mice were established as follows. B6;129-H2-Ab1<sup><italic>tm1Doi</italic>
</sup>
 (Iab<sup><italic>null</italic>
</sup>
) and NOD.Cg-<italic>Prkdc</italic>
<sup><italic>scid</italic>
</sup>
<italic>B2m</italic>
<sup><italic>tm1Unc</italic>
</sup>
/SzJ (NOD-scid B2m<sup><italic>null</italic>
</sup>
) mice were a kind gift from Dr Mathis D. of Harvard Medical School and Dr Shultz L. of The Jackson Laboratory (Bar Harbor, ME, USA), respectively. Iab<sup><italic>null</italic>
</sup>
 mice were first backcrossed into C57BL/6JJic mice more than seven generations. The established B6-Iab<sup><italic>null</italic>
</sup>
 mice were further backcrossed into NOG mice with a speed congenic technique combining a marker-assisted selection protocol and <italic>in vitro</italic>
 fertilization to obtain NOG-Iab<sup><italic>null</italic>
</sup>
 mice. NOG-B2m<sup><italic>null</italic>
</sup>
 mice were also established by backcross-mating NOD-scid B2m<sup><italic>null</italic>
</sup>
 to NOG mice to introduce the <italic>Il2rg</italic>
 gene. NOG-dKO mice were obtained by mating NOG-Iab<sup><italic>null</italic>
</sup>
 and NOG-B2m<sup><italic>null</italic>
</sup>
 mice. For genotyping NOG-B2m<sup><italic>null</italic>
</sup>
 mice and NOG-Iab<sup><italic>null</italic>
</sup>
 mice, 3 different primers were used for detection of WT and KO genotypes. The primers used to detect the β2 microglobulin (B2m) gene and I-ab gene were as follows: B2m gene, PI (B2m forward)=5′--3′, PII (B2m reverse WT)=5′--3′, and PIII (B2m reverse Mu)=5′--3′; I-ab gene, PI (Iab forward)=5′--3′, PII (Iab reverse WT)=5′--3′, and PIII (Iab reverse Mu)=5′--3′. Genomic DNA was extracted from the tails of the mice. The PCR reaction conditions were as follows: 94 °C 5 min/94 °C 30 s–60 °C 30 s–72 °C 60 s (35 cycles)/72 °C 10 min. A 676-bp band was detected for mutant B2m from the PI and PIII primer pair. A 488-bp band was detected for wild-type B2m from the PI and PII primer pair. A 587-bp band was detected for mutant Iab from the PI and PIII primer pair. A 335-bp band was detected for wild-type Iab from the PI and PII primer pair. The absence of MHC class I molecule expression in NOG strains (H-2K<sup>d</sup>
 and H-2D<sup>b</sup>
) on the surface of cells from NOG-dKO mice was confirmed by FACS (<xref rid="MOESM2" ref-type="media">Supplementary Figure 1</xref>
). Mouse care and all experimental procedures were performed under pathogen-free conditions in accordance with the established guidelines of Keio University and Central Institute for Experimental Animals. For generating human PBMC-transplanted mice, human PBMCs were collected from healthy volunteers with informed consent using Lymphoprep (AXIS-SHIELD PoC AS, Oslo, Norway) and were injected into mice intravenously (5 × 10<sup>6</sup>
/mouse).</p>
</sec>
<sec id="Sec4"><title>Cells</title>
<p id="Par9">A human melanoma cell line, 526mel, and C1R-A2 cells expressing a transfected genomic clone of HLA-A2.1 were obtained from the Surgery Branch of the National Cancer Institute, National Institutes of Health (Bethesda, MD). Mel2 is a melanoma cell line established from the same patients from which TIL2 cells were established as previously described.<sup><xref ref-type="bibr" rid="CR13">13</xref>
</sup>
 These cells were cultured in RPMI1640 (Invitrogen, Carlsbad, CA, USA) supplemented with 10 % fetal bovine serum and antibiotics. All cell cultures were maintained in a 5% CO<sub>2</sub>
 incubator at 37 °C.</p>
</sec>
<sec id="Sec5"><title>Flow cytometry</title>
<p id="Par10">Peripheral blood cells from hPBMC-NOG mice were stained with fluorescein-conjugated monoclonal antibodies (Abs) for 1 h. After red blood cells were lysed using OptiLyse C (Beckman Coulter Inc., Brea, CA, USA), the stained cells were analyzed using Gallios (Beckman Coulter Inc.). The antibodies used in this study were as follows; PE-Cy7 or Alexa Flour 700 anti-human CD45 (HI30), PE or PE-Cy7 anti-human CD8 (RPA-T8), FITC anti-human CD4 (RPA-T4), Horizon V450 anti-human CD3 (UCHT1), FITC anti-human CD19 (HIB19), Alexa Fluor 700 anti-human HLA-DR (G46-6), PE-Cy7 anti-human CD14 (M5E2), APC anti-human CD27 (M-T271), PE-Cy7 anti-human CD10 (HI10a), Horizon V450 anti-human CD11c (B-ly6), PE anti-H-2K<sup>d</sup>
 (SF1–1.1), Alexa Flour 700 anti-H-2D<sup>b</sup>
 (KH95), V500 or PerCP-Cy5.5 anti-mouse CD45 (30-F11), FITC anti-human CD45RA (L48), PE/Dazzle 594 anti-human CD62L (DREG-56).</p>
</sec>
<sec id="Sec6"><title>Immunohistochemistry</title>
<p id="Par11">All tissue samples were fixed in 10% neutral buffered formalin and embedded in paraffin. After deparaffinization, the sections were incubated in 3% hydrogen peroxide for 30 min at room temperature and pretreated with HistoVTone (Nacalai Tesque, Kyoto, Japan) for 20 min at 90 °C. Then, after being blocked in 1% goat serum, the specimens were incubated with anti-human CD3 Ab (F7.2.38; Dako Japan, Tokyo, Japan) at 4 °C overnight. An avidin-biotin complex method was performed with a VECTASTAIN ABC Human IgG Kit (Vector laboratories, Burlingame, CA, USA), according to the manufacturer’s instructions. The sections were developed with DAB in 0.003% hydrogen peroxide (Muto Pure Chemicals, Tokyo, Japan) and counterstained with hematoxylin. To determine the number of CD3<sup>+</sup>
 T cells, five fields at × 400 magnification per specimen were randomly chosen, and the positive counts were averaged.</p>
</sec>
<sec id="Sec7"><title>Influenza vaccination</title>
<p id="Par12">Influenza hemagglutinin (HA) vaccine (2010–2011 season; Kitasato Institute, Saitama, Japan), which was clinically used for humans, was obtained from the hospital pharmacy. Briefly, 5 μg of HA was intraperitoneally administered one day after human PBMC transplantation (day 0). The anti-HA IgG titer in the sera of mice was measured on day 7 and day 14 by ELISA. On day 16, anti-HA IgG-producing B cells were examined with enzyme-linked immunospot assay (ELISPOT).</p>
</sec>
<sec id="Sec8"><title>ELISA</title>
<p id="Par13">The total human IgG in mouse sera was measured with a Human IgG ELISA Kit (Abcam, Cambridge, UK), according to the manufacturer’s instructions.</p>
<p id="Par14">The relative concentration of anti-HA antibodies in mouse sera was measured by ELISA. Influenza HA vaccine (2010–2011 season; Kitasato Institute, Saitama, Japan) diluted in PBS (5 μg/ml) was coated on a 96-well micro-immune plate (Nunc, Denmark; 100 μl per well) for 2 h at room temperature. After three washes with PBS, the plate was blocked with 5% FBS/PBS (150 μl per well) for 2 h at room temperature. Sample sera were diluted from 1:100 to 1:218700 by threefold serial dilution with 5% FBS/PBS. After being blocked, the plate was washed with PBST (0.1% Tween20/PBS) three times. Then, the serially diluted sample sera and standard serum (100 μl per well) were incubated for 2 h at room temperature. After three washes with PBST, the samples were incubated with horseradish peroxidase (HRP)-conjugated goat anti-human IgG (Southern Biotechnology Associates, Birmingham, AL, USA; 1:5000 in 5% FBS/PBS, 100 μl per well) for 1 h at room temperature. HRP activity was visualized using tetramethyl benzidine-free base (Sigma, St Louis, MO, USA) and phosphate-citrate buffer. The relative concentrations of anti-HA antibodies were estimated by comparison to standard curves on each plate. Serum from a healthy volunteer with anti-HA IgG was used as standard serum. The titer of standard sera was defined as 1000 U/ml.</p>
</sec>
<sec id="Sec9"><title>ELISPOT</title>
<p id="Par15">Splenocytes from NOG-dKO mice were cultured (0.5 × 10<sup>6</sup>
 cells per 200 μl per well) for 2 h in a 96-well plate with a nitrocellulose base (Millititer HA; Millipore, Bedford, MA, USA) coated with influenza HA vaccine (2010–2011 season; Kitasato Institute) diluted in PBS (5 μg per 100 μl per well). After cells were removed, the plates were washed with H<sub>2</sub>
O five times and incubated with 10 mM EDTA-2Na/PBS (150 μl per well) for 10 min at room temperature. Then the plates were washed with PBST three times and PBS one time and incubated with 1% BSA/PBS at 4 °C overnight. Then, the plates were overlaid with an alkaline phosphatase-labeled anti-human IgG1 detection antibody (Southern Biotech, Birmingham, AL, USA) for 1 h at room temperature. After a wash with PBS, a precipitating substrate for alkaline phosphatase was added, and the plates were incubated until spots emerged at the site of the responding cells. The spots were counted using a CTL-ImmunoSpot S5 Micro Analyzer (Cellular Technology Limited, Shaker Heights, OH, USA).</p>
</sec>
<sec id="Sec10"><title>Multiplex cytokine analysis</title>
<p id="Par16">Various cytokines in sera from hPBMC-NOG-dKO mice and hPBMC-NOG mice were measured 23 days after human PBMC implantation using a Bio-plex pro human cytokine Grp 1 panel and Grp 2 panel (Bio-rad, Hercules, CA, USA), according to the manufacturer’s instructions.</p>
</sec>
<sec id="Sec11"><title>Dendritic cell vaccination</title>
<p id="Par17">Human monocyte-derived DCs (Mo-DCs) were generated as previously reported.<sup><xref ref-type="bibr" rid="CR14">14</xref>
</sup>
 Briefly, human CD14<sup>+</sup>
 monocytes were isolated from human PBMCs using MACS beads (Miltenyi Biotec, Bergisch Gladbach, Germany) and cultured with DC medium containing RPMI1640, 1.5% human autologous sera, GM-CSF (100 ng/ml) and IL-4 (50 ng/ml) for 2 days (1.5–2 × 10<sup>7</sup>
 cells/10 cm dish). Then, 10 ng/ml TNF-α, 10 ng/ml IL-1β, 250 ng/ml PGE2, 5000 U/ml IFN-γ, 20 ng/ml poly(I:C) and 1 mg/ml R848 were added for cell maturation. On day 3, the Mo-DCs were harvested and pulsed with HLA-A2 restricted CMVpp65<sub>495–503</sub>
 peptide (NLVPMVATV; 5 μg/ml in 1 ml of AIM-V medium) for 1 h. Then, these 3–5 × 10<sup>6</sup>
 pulsed Mo-DCs were intravenously administered to human PBMC-transferred NOG-dKO mice. This DC vaccine was administered on day 0, day 7 and day 14. Unpulsed Mo-DCs were administered to the control group. On day 21, human T cells were harvested from the spleen, peripheral blood, and bone marrow of vaccinated-NOG-dKO mice using CD3 MACS beads (Miltenyi Biotec). The sorted human T cells (1.5 × 10<sup>6</sup>
per well per 2 ml) were cocultured with irradiated (32 Gy) CD3<sup>+</sup>
 T cell-depleted autologous PBMCs (3 × 10<sup>6</sup>
per well per 2 ml) in a 24-well plate with CMVpp65 peptide (2.5 μg/mL), IL-2 (20 U/ml), and IL-7 (10 ng/mL) for 7 days. Then, T cells were harvested using Lymphoprep (AXIS-SHIELD PoC AS) and stained with PerCP-Cy5.5 anti-CD45, PE-Cy7 anti-CD8, brilliant violet anti-CD3, and PE HLA-A*02:01 CMV pp65 tetramer-NLVPMVATV (MBL, Nagoya, Japan). PE HLA-A*02:01 HIV gag tetramer-SLYNTVATL (MBL) was used as a negative control.</p>
</sec>
<sec id="Sec12"><title>Generation of MART-1-specific T cells</title>
<p id="Par18">MART-1-specific T cells (MART-Ts) were generated as previously described.<sup><xref ref-type="bibr" rid="CR15">15</xref>
</sup>
 Briefly, the plasmid encoding the HLA-A*0201-restricted MART-1-specific TCR was a gift from Dr Ken-ichi Hanada (Surgery Branch, National Cancer Institute, National Institutes of Health, USA). PBMCs from healthy donors were stimulated with soluble OKT-3 (50 ng/ml) and recombinant human IL-2 (300 IU/ml; Novartis, East Hanover, NJ, USA) for 2 days before transduction. The stimulated cells were then transfected with a retrovirus expressing the MART-1-specific TCR gene. The specificity of the generated MART-Ts was evaluated by determining the production of IFN-γ from MART-Ts cocultured with HLA-A2 epitope peptide (gp100<sub>154–162</sub>
: KTWGQYWQV or MART-1<sub>27–35</sub>
: ELAGIGILTV)-pulsed C1R-A2 cells.</p>
</sec>
<sec id="Sec13"><title><italic>In vitro</italic>
 expansion of human melanoma TILs</title>
<p id="Par19">TIL2 cells were cultured tumor infiltrating lymphocytes established from the same patient from which Mel2 cells were established, as described previously.<sup><xref ref-type="bibr" rid="CR13">13</xref>
</sup>
 Briefly, melanoma tumor digests were cultured in a 24-well plate containing 2 ml of RPMI1640 supplemented with 10% human serum, antibiotics and recombinant human IL-2 (6000 IU/ml, Novartis). Five days after initiation, half of the medium was replaced with fresh complete medium containing IL-2; this was repeated every 2 to 3 days thereafter as needed. The recognition of Mel2 cells by TIL2 cells was confirmed by examining IFN-γ production from TIL2 cells (2 × 10<sup>5</sup>
) cocultured with Mel2 cells (1 × 10<sup>5</sup>
) with 10 μg/ml of anti-HLA-ABC Ab (W6/32, BioXcell, West Lebanon, NH, USA) or mouse IgG2a isotype control (C1.18.4, BioXcell).</p>
</sec>
<sec id="Sec14"><title>Adoptive cancer immunotherapy models</title>
<p id="Par20">Briefly, 5 × 10<sup>6</sup>
 526mel cells were subcutaneously inoculated into the flank of NOG or NOG-dKO mice. Cultured MART-Ts (5 × 10<sup>6</sup>
 cells per mouse) were intravenously administered on day 9. 4 × 10<sup>6</sup>
 Mel2 cells were subcutaneously inoculated into the flank of NOG-dKO mice. Cultured TIL2 cells were intraperitoneally administered on day 0 (3.75 × 10<sup>7</sup>
) and day 3 (1 × 10<sup>8</sup>
). Tumor volumes were calculated according to the following formula: [(length) × (width)<sup>2</sup>
]/2.</p>
</sec>
</sec>
<sec id="Sec15" sec-type="results"><title>Results</title>
<sec id="Sec16"><title>Mild GVHD in human PBMC-transplanted murine MHC class I- and class II-deficient NOG mice</title>
<p id="Par21">Murine MHC class I- and class II-deficient NOG (NOD/Shi-<italic>scid</italic>
<italic>IL2rg</italic>
<sup><italic>null</italic>
</sup>
) mice (NOG-dKO) were generated by mating β2-microgrobulin-knockout NOG mice (NOG-B2m<sup><italic>null</italic>
</sup>
) and Iab-knockout NOG mice (NOG-Iab<sup><italic>null</italic>
</sup>
). To verify the usefulness of NOG-dKO mice as a mouse model enabling long-term analysis of immune responses by transplanted human peripheral immune cells, we compared the onset and symptoms of xeno-GVHD between NOG mice and NOG-dKO mice in which 5 × 10<sup>6</sup>
 human PBMCs were transplanted. NOG mice implanted with human PBMCs (hPBMC-NOG) died of severe xeno-GVHD within 2 to 6 weeks with a reduction in body weight (<xref rid="Fig1" ref-type="fig">Figure 1a</xref>
) and with human T-cell infiltration into various organs, including the kidney, liver, colon, skin, lung and spleen, while NOG-dKO mice implanted with human PBMCs (hPBMC-NOG-dKO) survived for >4 months without significant body weight loss and with less human T-cell infiltration in the various organs (<xref rid="Fig1" ref-type="fig">Figures 1a and b</xref>
 and <xref rid="MOESM3" ref-type="media">Supplementary Figure 2</xref>
). We also measured various human cytokines in the mouse sera on day 23 using Bio-plex and found that IFN-γ (NOG-dKO; 910.1±986.7 pg/ml, NOG; 4557.8±1348.1 pg/ml (<italic>P</italic>
<0.005; <italic>t</italic>
-test)) and RANTES (NOG-dKO; 281.4±284.2 pg/ml, NOG; 1423.5±196.4 pg/ml (<italic>P</italic>
<0.001; <italic>t</italic>
-test)), which are known to be related to T-cell activation, were significantly lower in the sera of NOG-dKO mice. These results suggest that the NOG-dKO mouse might be useful as a mouse model for analyzing transferred human PBMCs with less xeno-GVHD effects.<fig id="Fig1"><label>Figure 1</label>
<caption><p>Mild GVHD in human peripheral blood mononuclear cell (PBMC)-transplanted murine MHC class I- and class II-deficient NOG mice. (<bold>a</bold>
) Body weight changes in NOG and NOG-dKO mice with or without intravenous transplantation of human PBMCs are shown. † indicates death of the mouse. Only human PBMC-transferred NOG mice showed severe body weight loss, finally dying of severe graft versus host disease (GVHD). % weight indicates the percentage weight change from the initial weight. Each line indicates an individual mouse (<italic>n</italic>
=4–5). (<bold>b</bold>
) Twenty-eight days after human PBMC transplantation, human CD3<sup>+</sup>
 T cells infiltrating into the kidney and liver (area indicated by the dotted line) were analyzed via immunohistochemistry. For calculating CD3<sup>+</sup>
 T cells, five fields at × 400 magnifications per specimen were randomly chosen, and the positive counts were averaged. Bars represent 200 μm. The data are representative of three experiments. Error bars are ±s.d.; *<italic>P</italic>
<0.05 (<italic>t</italic>
-test).</p>
</caption>
<graphic xlink:href="41423_2018_113_Fig1_HTML" id="d29e829"></graphic>
</fig>
</p>
</sec>
<sec id="Sec17"><title>Engraftment of transferred human PBMCs in NOG-dKO mice</title>
<p id="Par22">CD4<sup>+</sup>
 T cells and CD8<sup>+</sup>
 T cells are the major populations in transferred human PBMCs expanded in NOG mice and NOG-dKO mice (<xref rid="Fig2" ref-type="fig">Figures 2a and b</xref>
). Transferred human T cells increased more moderately in NOG-dKO mice than in NOG mice but could be detected for at least 4 months (<xref rid="Fig2" ref-type="fig">Figure 2b</xref>
). The major populations of CD8<sup>+</sup>
 T cells that expanded in NOG-dKO mice were central memory T cells and effector memory T cells (<xref rid="Fig2" ref-type="fig">Figure 2c</xref>
). Although the number of B cells in the peripheral blood is relatively low, they were detected for at least 4 months (<xref rid="Fig2" ref-type="fig">Figure 2d</xref>
), and human IgG was also detected in sera (68.0±21.1 μg/ml on day 23, 194.9±177.4 μg /ml on day 71). Compared with the spleen and peripheral blood, the bone marrow contained a much higher number of B cells with memory B-cell phenotypes (CD10<sup>−</sup>
, CD27<sup>+</sup>
) on day 83, suggesting possible memory B cell homing to the bone marrow (<xref rid="Fig2" ref-type="fig">Figure 2e</xref>
). While T cells and B cells were detected for at least 4 months in NOG-dKO mice, dendritic cells (CD11c<sup>+</sup>
 HLA-DR<sup>+</sup>
 cells) were detected for only 10 days (<xref rid="Fig2" ref-type="fig">Figure 2f</xref>
). These results indicate that human B cells, T cells and antigen presenting cells can be engrafted in NOG-dKO mice with little sign of GVHD.<fig id="Fig2"><label>Figure 2</label>
<caption><p>Analysis of transferred human PBMCs in NOG-dKO mice. (<bold>a</bold>
, <bold>b</bold>
, <bold>d</bold>
 and <bold>f</bold>
) After intravenous transplantation of human PBMCs into NOG and NOG-dKO mice, human CD45<sup>+</sup>
 leukocytes (<bold>a</bold>
), CD4<sup>+</sup>
 or CD8<sup>+</sup>
 T cells (<bold>b</bold>
), CD19<sup>+</sup>
 B cells (<bold>d</bold>
) and CD11c<sup>+</sup>
 HLA-DR<sup>+</sup>
 dendritic cells (<bold>f</bold>
; representative dot plots are shown in right panels. % of human CD11c<sup>+</sup>
 HLA-DR<sup>+</sup>
 cells in human CD45 cells are shown.) were monitored in the peripheral blood of the mice using FACS. Human T cells and B cells could be detected for >100 days in the NOG-dKO mice. (<bold>c</bold>
) The subsets of CD8<sup>+</sup>
 T cells (naive T cells (T<sub>N</sub>
; CD45RA<sup>+</sup>
, CD62L<sup>+</sup>
), central memory T cells (T<sub>CM</sub>
; CD45RA<sup>−</sup>
, CD62L<sup>+</sup>
), effector memory T cells (T<sub>EM</sub>
; CD45RA<sup>−</sup>
, CD62L<sup>−</sup>
), and terminally differentiated effector memory cells re-expressing CD45RA (T<sub>EMRA</sub>
; CD45RA<sup>+</sup>
, CD62L<sup>−</sup>
)) are shown. (<bold>e</bold>
) Human CD19<sup>+</sup>
 B cells were analyzed in the bone marrow (BM), spleen, and peripheral blood (PB) on day 83 (top panel). The expression of B-cell differentiation markers on B cells in the BM from a representative mouse (bottom panel). The data are representative of 5 experiments. <italic>n</italic>
=4–5. # or * indicates <italic>P</italic>
<0.05 (the numbers of the indicated cells in NOG mice were significantly higher than those in NOG-dKO mice at each day marked with * or # (<bold>a</bold>
, <bold>b</bold>
 and <bold>d</bold>
). * is for CD8 and # is for CD4 (<bold>b</bold>
). The numbers of the indicated cells on d28 or d45 was significantly lower than those on d17 (<bold>c</bold>
). A <italic>t</italic>
-test was applied on the logarithmic scale (<bold>a</bold>
, <bold>b</bold>
 and <bold>d</bold>
) and on the linear scale (<bold>c</bold>
)).</p>
</caption>
<graphic xlink:href="41423_2018_113_Fig2_HTML" id="d29e1024"></graphic>
</fig>
</p>
</sec>
<sec id="Sec18"><title>Induction of antigen-specific B-cell responses by influenza vaccination in human PBMC-transferred NOG-dKO mice</title>
<p id="Par23">Next, we evaluated whether antigen-specific B-cell responses can be induced in the hPBMC-NOG-dKO mice. After human PBMCs were transferred to the NOG-dKO mice from healthy human volunteers who had anti-influenza hemagglutinin (HA) IgG antibodies in their sera, the mice were intraperitoneally immunized with HA vaccine. Then, 14–16 days after the vaccination, an increase in human HA-specific IgG Ab (<xref rid="Fig3" ref-type="fig">Figure 3a</xref>
) and HA-specific IgG production from the transferred human B cells (<xref rid="Fig3" ref-type="fig">Figure 3b</xref>
) were observed in the sera and spleen of the NOG-dKO mice, respectively. These results suggest that antigen-specific B-cell responses can be induced by immunization of the antigen in hPBMC-NOG-dKO mice.<fig id="Fig3"><label>Figure 3</label>
<caption><p>Influenza HA-specific B-cell responses were induced by HA vaccination in the human PBMC-transferred NOG-dKO mice. NOG-dKO mice were intraperitoneally immunized with influenza HA vaccine on the day after intravenous transplantation of human PBMCs. On day 7 and day 14, mice sera were collected and the anti-HA IgG titer was measured by ELISA (<bold>a</bold>
). On day 16, the number of anti-HA IgG-producing human B cells collected from mouse spleens were measured by ELISPOT (<bold>b</bold>
). The data are representative of three experiments. Each dot indicates an individual mouse (<italic>n</italic>
=3–4). *<italic>P</italic>
<0.05 (<italic>t</italic>
-test).</p>
</caption>
<graphic xlink:href="41423_2018_113_Fig3_HTML" id="d29e1060"></graphic>
</fig>
</p>
</sec>
<sec id="Sec19"><title>Induction of antigen-specific T-cell responses by dendritic cell vaccination in human PBMC-transferred NOG-dKO mice</title>
<p id="Par24">Next, we evaluated whether antigen-specific T-cell responses could be induced in the hPBMC-NOG-dKO mice. Because of poor survival of antigen presenting cells, including dendritic cells, in the hPBMC-NOG-dKO mice (<xref rid="Fig2" ref-type="fig">Figure 2f</xref>
), we repeatedly immunized the mice with antigen-pulsed autologous mature monocyte-derived dendritic cells (Mo-DCs) for induction of antigen-specific T cells. After human PBMCs from healthy volunteers who had memory CMV-specific CD8<sup>+</sup>
 T cells were transferred into the NOG-dKO mice, we weakly immunized the mice with autologous Mo-DCs pulsed with HLA-A0201-binding CMV antigen-derived peptide (CMVpp65<sub>495-503</sub>
; NLVPMVATV) three times. After these DC immunizations, human CD3<sup>+</sup>
 T cells were isolated from the spleen, peripheral blood and bone marrow of the immunized hPBMC-NOG-dKO mice on day21, re-stimulated with CMVpp65<sub>495–503</sub>
 peptide for a week <italic>in vitro</italic>
, and evaluated for the induction of CMVpp65-specific T cells using an HLA0201/ CMVpp65<sub>495-503</sub>
-tetramer (<xref rid="Fig4" ref-type="fig">Figure 4a</xref>
). CMVpp65-specific T-cell induction was observed in the spleen, bone marrow, and peripheral blood of the DC-immunized mice (<xref rid="Fig4" ref-type="fig">Figure 4b</xref>
), indicating that the induction of antigen-specific T cells can be evaluated in the hPBMC-NOG-dKO mice.<fig id="Fig4"><label>Figure 4</label>
<caption><p>CMV-specific T-cell responses were induced by dendritic cell vaccines in the human PBMC-transferred NOG-dKO mice. Schema of the experiment (<bold>a</bold>
). Human PBMC-transferred NOG-dKO mice were weekly immunized with HLA-0201-binding peptide (CMVpp65<sub>495–503</sub>
)-pulsed autologous monocyte-derived DCs (Mo-DCs) three times. Control mice were immunized with un-pulsed Mo-DCs. On day 21, human CD3<sup>+</sup>
 T cells were sorted from the peripheral blood (PB), spleen, and bone marrow (BM) and re-stimulated with irradiated CMVpp65 peptide-pulsed CD3-depleted autologous hPBMCs <italic>in vitro</italic>
 for 7 days. Then, CMV-specific CTL induction was evaluated using HLA0201/CMVpp65<sub>495–503</sub>
-tetramer. HLA0201/HIVgag<sub>77-85</sub>
-tetramer was used as negative control. The values are % of tetramer-positive cells in CD8<sup>+</sup>
 positive cells. The data are representative of two experiments (<bold>b</bold>
, left). The CMV-specific CTL induction was calculated as (% of CMV-tetramer)−(% of HIV tetramer), and the averaged CTL induction in the spleen, BM, and PB from two independent experiments was compared between the DC vaccine group and control group. *<italic>P</italic>
<0.05; Mann–Whitney test (<bold>b</bold>
, right).</p>
</caption>
<graphic xlink:href="41423_2018_113_Fig4_HTML" id="d29e1134"></graphic>
</fig>
</p>
</sec>
<sec id="Sec20"><title>Adoptively transferred tumor-specific T cells can show anti-tumor effects with little sign of GVHD in NOG-dKO mice</title>
<p id="Par25">NOG mice have been used previously for evaluation of the <italic>in vivo</italic>
 killing activity of adoptively transferred human tumor-specific T cells. However, severe GVHD has been an obstacle for long-term follow-up and precise evaluation of the function of the T cells. We evaluated whether NOG-dKO mice can be used as a mouse model for T-cell-based adoptive cancer immunotherapies. We implanted 526 mel, a human melanoma cell line expressing MART-1,<sup><xref ref-type="bibr" rid="CR16">16</xref>
</sup>
 a human melanoma antigen, and HLA-0201, in NOG mice and NOG-dKO mice and treated them with MART-1-specific T cells (MART-Ts), which were generated by transducing the HLA-0201-restricted MART-1-specific TCR gene into activated PBMC-derived T cells from healthy human volunteers<sup><xref ref-type="bibr" rid="CR15">15</xref>
</sup>
 (<xref rid="Fig5" ref-type="fig">Figure 5a</xref>
). The NOG-dKO mice showed anti-tumor effects induced by MART-T administration with no body weight loss (<xref rid="Fig5" ref-type="fig">Figures 5b and c</xref>
). Co-administration of exogenous human recombinant IL-2 prolonged the survival of T cells with higher MART-1/HLA-A2 tetramer-positive cells and enhanced the anti-tumor effects in NOG-dKO mice (<xref rid="Fig5" ref-type="fig">Figures 5d and e</xref>
). Although the NOG mice showed stronger anti-tumor effects along with increased transfer of T cells, probably due to strong T-cell expansion via xenogeneic GVHD responses, the ratio of MART-1-specific T cells in the CD8<sup>+</sup>
 T cells was smaller than that in NOG-dKO mice, suggesting that T-cell phenotypes were modified by xenogeneic GVHD responses in NOG mice (<xref rid="Fig5" ref-type="fig">Figure 5e</xref>
). Next, we treated human melanoma-bearing NOG-dKO mice with autologous tumor infiltrating lymphocytes (TILs). In NOG-dKO mice, administration of cultured tumor infiltrating T cells, TIL2<sup><xref ref-type="bibr" rid="CR17">17</xref>
</sup>
 cells (<xref rid="Fig5" ref-type="fig">Figure 5f</xref>
), showed significant anti-tumor effects against an autologous melanoma cell line, Mel2, which was established from the same patient from which the TIL2 cells were established (<xref rid="Fig5" ref-type="fig">Figure 5g</xref>
). CD271 on human melanoma cells, which is reported to be induced by IFN-γ and involved in suppression of melanoma-specific CTLs,<sup><xref ref-type="bibr" rid="CR18">18</xref>
</sup>
 was found to be increased in TIL2-treated melanoma cells (<xref rid="Fig5" ref-type="fig">Figure 5h</xref>
), suggesting that NOG-dKO mice might also be used for evaluation of changes in human cancer phenotypes induced by T-cells following immune interventions. Altogether, the results of this study demonstrated that NOG-dKO mice are more useful for detailed and long-term analysis of B-cell responses and T cell responses at both the induction and effector phases of human peripheral blood than regular NOG mice.<fig id="Fig5"><label>Figure 5</label>
<caption><p>Adoptively transferred tumor-specific T cells can show anti-tumor effects with little sign of GVHD in NOG-dKO mice. (<bold>a</bold>
) The MART-1-specific T cells (MART-Ts) used in the experiment specifically recognized MART-1 in an HLA-0201-restricted manner. MART-Ts were cocultured for 18 h with C1R-A2 cells pulsed with a HLA-0201-binding MART-1 peptide or an HLA-0201-binding gp100 peptide, 526mel (an HLA-A*0201<sup>+</sup>
 MART-1<sup>+</sup>
 melanoma cell line) cells, or 888mel (an HLA-A*0201<sup>−</sup>
 melanoma cell line) cells. IFN-γ in the supernatant was measured by ELISA. (<bold>b</bold>
–<bold>e</bold>
) 526mel cells were inoculated into NOG or NOG-dKO mice and treated with MART-Ts. Body weight changes (<bold>b</bold>
) and tumor growth (<bold>c</bold>
) in NOG and NOG-dKO mice are shown. † indicates death of the mouse. % weight indicates the percentage weight change from the initial weight. The anti-tumor effects of MART-Ts in NOG-dKO mice were augmented by daily administration of recombinant human IL2 (5000 IU per mouse) (<bold>d</bold>
). The absolute numbers of administered human CD3<sup>+</sup>
, CD8<sup>+</sup>
, or HLA-A2/MART-1<sub>27–35</sub>
-tetramer<sup>+</sup>
 cells and the % of HLA-A2/MART-1<sub>27–35</sub>
-tetramer<sup>+</sup>
 cells in CD8<sup>+</sup>
 cells in the peripheral blood of NOG or NOG-dKO mice were measured via FACS (<bold>e</bold>
). <italic>n</italic>
=4–5. (<bold>f</bold>
) The TIL2 cells used in the experiment recognized autologous melanoma (Mel2) cells in an MHC class I-dependent manner. TIL2 and Mel2 cells were cocultured for 18 h with anti-HLA-ABC neutralizing Ab or its isotype control. IFN-γ in the supernatant was measured by ELISA. (<bold>g</bold>
) Mel2 cells were inoculated into NOG-dKO mice and treated with autologous TIL2 cells. <italic>n</italic>
=4. (<bold>h</bold>
) On day 35, CD271 expression on Mel2 cells was evaluated via FACS. Representative FACS dot plots are shown in the right panels. The data are representative of three (<bold>a</bold>
–<bold>e</bold>
) or two (<bold>f</bold>
–<bold>h</bold>
) experiments. Error bars are ±s.d. *<italic>P</italic>
<0.05 (<italic>t</italic>
-test).</p>
</caption>
<graphic xlink:href="41423_2018_113_Fig5_HTML" id="d29e1282"></graphic>
</fig>
</p>
</sec>
</sec>
<sec id="Sec21" sec-type="discussion"><title>Discussion</title>
<p id="Par26">Human PBMC-engrafted immunodeficient mice might be good models for analyzing human individual immune status, such as B-cell responses to vaccination and T-cell responses against autologous cancers. However, severe xeno-GVHD has been a formidable obstacle for long term and precise evaluation of human immune responses induced in these mice. In this study, we newly established murine MHC class I- and class II-deficient NOG mice and showed much milder GVHD induced by transferred human T cells and success of the induction of human B-cell and T-cell immune responses in hPBMC-NOG-dKO mice.</p>
<p id="Par27">Generally, NOG/NSG mice, which additionally lack NK activities, showed significant improvement in survival of engrafted human PBMCs and in xeno-GVHD induction compared with other immunodeficient mouse models, such as NOD/SCID mice.<sup><xref ref-type="bibr" rid="CR4">4</xref>
</sup>
 King <italic>et al.</italic>
<sup><xref ref-type="bibr" rid="CR19">19</xref>
</sup>
 have reported that the development of xeno-GVHD in NSG mice is highly dependent on host expression of both murine MHC class I and class II molecules. They have shown that both MHC class I-single-knockout mice and MHC class II-single-knockout mice developed xeno-GVHD. In this study, double-knockout of both murine MHC class I and class II molecules results in much milder xeno-GVHD in hPBMC-NOG-dKO mice, suggesting that together the MHC class I and MHC class II molecules in recipients play a major role in the pathogenesis of GVHD.</p>
<p id="Par28">Although there was no obvious symptomatic sign of GVHD in hPBMC-NOG-dKO mice, the number of human T cells in hPBMC-NOG-dKO mice continued to increase until three weeks after PBMC engraftment, and mild human T-cell infiltration was observed in their organs (<xref rid="Fig1" ref-type="fig">Figures 1b</xref>
 and <xref rid="Fig2" ref-type="fig">2a</xref>
 and <xref rid="MOESM3" ref-type="media">Supplementary Figure 2</xref>
). One possible mechanism is incomplete downregulation of MHC class I molecules by the deletion of the β2 microglobulin gene, although we confirmed little expression of MHC class I molecules on the surface of cells from NOG-dKO mice (<xref rid="MOESM2" ref-type="media">Supplementary Figure 1</xref>
). The other possible mechanisms involved in the stimulation of engrafted human T cells might be homeostatic proliferation, engrafted human antigen-presenting cells presenting murine proteins, and murine minor histocompatibility antigens (mHAs). Further analysis is needed to elucidate the mechanism underlying this T-cell stimulatory effect.</p>
<p id="Par29">B-cell responses in human PBMC-engrafted immunodeficient mice have been previously reported. For example, Okada <italic>et al.</italic>
<sup><xref ref-type="bibr" rid="CR20">20</xref>
</sup>
 reported that vaccination of cDNA constructs encoding the antigenic protein of severe acute respiratory corona virus induced the production of Ag-specific antibodies. However, the B-cell response in these mice might be influenced by xeno-GVHD reaction. In this study, we showed influenza HA-specific IgG production in hPBMC-NOG-dKO mice vaccinated with HA antigen, suggesting that even with little inflammation caused by xeno-GVHD reaction, B-cell responses can be induced. Lack of xeno-GVHD in our mouse models enables more long-term and precise evaluation of human B-cell characteristics and responses. For example, the observation of B cells homing to the bone marrow (BM) almost 3 months (long-term) after human PBMC transfer in NOG-dKO mice (<xref rid="Fig2" ref-type="fig">Figure 2e</xref>
) is of interest. The mechanism of human B-cell homing to the BM and generation of memory B cells could be analyzed using our mouse models.</p>
<p id="Par30">Considering the lack of <italic>de novo</italic>
 multi-lineage human hematopoiesis, it seems to be difficult to induce primary immune responses in human PBMC-engrafted immunodeficient mouse models.<sup><xref ref-type="bibr" rid="CR10">10</xref>
</sup>
 Thus, the mechanism of IgG production in our mouse models might be related to reactivation of antigen-experienced memory B cells. Whether primary immune responses can be induced by supplying antigen presenting cells in our mouse models remains to be evaluated in the future.</p>
<p id="Par31">Although the development of CD4<sup>+</sup>
 and CD8<sup>+</sup>
 T cells and reconstitution of human acquired immunity<sup><xref ref-type="bibr" rid="CR5">5</xref>
,<xref ref-type="bibr" rid="CR7">7</xref>
,<xref ref-type="bibr" rid="CR21">21</xref>
,<xref ref-type="bibr" rid="CR22">22</xref>
</sup>
 have been shown in human HSC-transplanted immunodeficient <italic>Il2rγ</italic>
<sup><italic>null</italic>
</sup>
 mouse strains, the induction of human HLA-restricted T-cell responses in humanized mice was limited by the lack of HLA expression. Some groups reported that the introduction of human HLA expression improved human HLA-restricted CTL responses.<sup><xref ref-type="bibr" rid="CR8">8</xref>
,<xref ref-type="bibr" rid="CR23">23</xref>
,<xref ref-type="bibr" rid="CR24">24</xref>
,<xref ref-type="bibr" rid="CR25">25</xref>
,<xref ref-type="bibr" rid="CR26">26</xref>
</sup>
 These previous studies used human HSCs to reconstitute human immune systems, which are not suitable for analyzing human current immune status of individuals, including patients.</p>
<p id="Par32">Chun <italic>et al.</italic>
<sup><xref ref-type="bibr" rid="CR27">27</xref>
</sup>
 previously reported that NOD/SCID β<sub>2</sub>
 microglobulin<sup>−/−</sup>
 mice engrafted with human HSCs and further reconstituted with autologous peripheral T cells could induce HLA-restricted T-cell responses against influenza virus vaccines. Spranger <italic>et al.</italic>
<sup><xref ref-type="bibr" rid="CR28">28</xref>
</sup>
 previously reported that in human-PBMC engrafted NSG mice vaccination with human Mo-DCs expressing MART-1 could induce MART-1-specific T cells. These previous studies showed the induction of HLA-restricted T-cell responses from human peripheral blood; however, the influence of xeno-GVHD might be a problem for evaluation of these T-cell responses in these humanized mice. In this study, we showed that immunization with human Mo-DCs pulsed with HLA-A2 restricted CMV peptides induced CMV-specific CTLs in hPBMC-NOG-dKO mice. Our humanized mouse system showed that with little xenogeneic stimulation antigen-specific T cells could be induced, and this system may be an attractive model for more precise evaluation of human peripheral T-cell responses.</p>
<p id="Par33">To evaluate the anti-tumor effect of human tumor-specific T cells, such as tumor infiltrating lymphocytes and genetically engineered human T cells expressing chimeric antigen receptors (CARs)<sup><xref ref-type="bibr" rid="CR29">29</xref>
</sup>
 or TCRs,<sup><xref ref-type="bibr" rid="CR30">30</xref>
</sup>
 previous studies often utilized human tumor-bearing immune deficient mice, such as NOG, NSG, and NOD/SCID mice. In these models, the xeno-GVHD reaction stimulates transferred T cells, alters their phenotypes and masks the real anti-tumor effects. Actually, in our experiment, transferred MART-1-specific T cells were preferentially expanded in NOG-dKO mice compared with NOG mice (<xref rid="Fig5" ref-type="fig">Figure 5e</xref>
). The effector phase of anti-tumor immune responses in which anti-tumor T cells recognize and kill tumor cells can be evaluated more precisely and for a longer period in our NOG-dKO mouse models than in NOG mouse models because of the lack of xeno-GVHD. In particular, T-cell phenotypes, such as anergy or exhaustion, might be effectively evaluated. Our colleagues have recently reported that immunotherapies targeting PD-1 could be more precisely evaluated in our NOG-dKO mice than in NOG mice because the xeno-GVHD reaction induces nonspecific T-cell activation accompanied by PD-1 expression in NOG mice.<sup><xref ref-type="bibr" rid="CR31">31</xref>
</sup>
 On the other hand, because of the short longevity of antigen presenting cells, our current mouse models may not be suitable for evaluation of the induction phase of anti-tumor immune responses if DCs are not supplied, as shown in <xref rid="Fig4" ref-type="fig">Figure 4</xref>
. A variety of immune cells, such as macrophages, MDSCs, Tregs and NK cells, which play important roles in the cancer microenvironment, are also not well supported in our current mouse models. For supporting these cells, we are now developing various human cytokine-producing transgenic NOG strains.<sup><xref ref-type="bibr" rid="CR32">32</xref>
</sup>
</p>
<p id="Par34">In conclusion, compared with NOG mice, hPBMC-NOG-dKO mice are useful for analyzing current human individual immune status and providing long-term and more precise evaluation of human T-cell and B-cell responses.</p>
</sec>
<sec sec-type="supplementary-material"><title>Electronic supplementary material</title>
<sec id="Sec551"><p><supplementary-material content-type="local-data" id="MOESM1"><media xlink:href="41423_2018_113_MOESM1_ESM.docx"><caption><p>Supplementary Figure Legends</p>
</caption>
</media>
</supplementary-material>
<supplementary-material content-type="local-data" id="MOESM2"><media xlink:href="41423_2018_113_MOESM2_ESM.pdf"><caption><p>Supplementary Figure S1</p>
</caption>
</media>
</supplementary-material>
<supplementary-material content-type="local-data" id="MOESM3"><media xlink:href="41423_2018_113_MOESM3_ESM.pdf"><caption><p>Supplementary Figure S2</p>
</caption>
</media>
</supplementary-material>
</p>
</sec>
</sec>
</body>
<back><fn-group><fn><p>These authors contributed equally to this work.</p>
</fn>
<fn><p>Co-corresponding authors.</p>
</fn>
</fn-group>
<sec><title>Electronic supplementary material</title>
<p>Supplementary Information for this article can be found on the <italic>Cellular & Molecular Immunology</italic> website 10.1038/cmi.2017.106
</p>
</sec>
<ack><title>Acknowledgements</title>
<p>This work was supported by Grants-in-aid for Scientific Research from the Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan (22220007, 26221005 and 15K09783); the Project for Development of Innovative Research on Cancer Therapeutics (P-DIRECT) and the Project for Cancer Research And Therapeutic Evolution (P-CREATE) from Japan Agency for Medical Research and Development (AMED); a grant from Tokyo Biochemical Research Foundation; a Keio University Grant-in-Aid for Encouragement of Young Medical Scientists; and a Grant-in-Aid from the Keio Medical Association. We would like to thank Miyuki Saito for technical assistance and Misako Horikawa and Ryoko Suzuki for preparation of the manuscript.</p>
</ack>
<notes notes-type="COI-statement"><title>Conflict of interest</title>
<p id="Par35">The authors declare no conflict of interest.</p>
</notes>
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Human PBMC-transferred murine MHC class I/II-deficient NOG mice enable long-term evaluation of human immune responses

Human PBMC-transferred murine MHC class I/II-deficient NOG mice enable long-term evaluation of human immune responses

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