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Effective Depletion of Regulatory T Cells Allows the Recruitment of Mesothelin‐Specific CD8+ T Cells to the Antitumor Immune Response Against a Mesothelin‐Expressing Mouse Pancreatic Adenocarcinoma

Identifieur interne : 000803 ( Istex/Checkpoint ); précédent : 000802; suivant : 000804

Effective Depletion of Regulatory T Cells Allows the Recruitment of Mesothelin‐Specific CD8+ T Cells to the Antitumor Immune Response Against a Mesothelin‐Expressing Mouse Pancreatic Adenocarcinoma

Auteurs : Ihid C. Leao ; Priya Ganesan ; Todd D. Armstrong ; Elizabeth M. Jaffee [États-Unis]

Source :

RBID : ISTEX:237572302112A935F98DA47984194D457312F603

English descriptors

Abstract

Vaccine‐induced CD8+ T‐cell responses can eradicate developing tumors in vivo in mouse models. Translating these successes into approved treatments for cancer patients has been challenging, since many of these models lack expression of clinically proven/relevant tumor antigens. We have shown that mesothelin is a clinically relevant CD8+ T‐cell target in human pancreas cancer, which is also highly conserved among species. Here, we utilize the murine mesothelin‐expressing pancreatic tumor model (Panc02) to identify the immune‐relevant mesothelin‐derived peptides and study interventions that enhance the antitumor response. We first screened overlapping peptides of the entire murine mesothelin protein to identify two new CD8+ mesothelin‐restricted epitopes. These peptides were then evaluated for recognition by vaccine‐induced T cells from mice treated with vaccine in sequence with low‐dose cyclophosphamide (CY) and an anti‐CD25 IL‐2Rα monoclonal antibody (PC61). These treatments are both known to deplete subpopulations of T regulatory cells (Tregs). Our findings demonstrate that combined Treg‐depleting therapies synergize to enhance vaccine efficacy. Furthermore, our data supports mesothelin as a relevant antigen in murine and clinical models and the use of Panc02 as a clinically relevant murine model of pancreatic cancer for evaluating antigen‐targeted immunotherapies in immune‐tolerant hosts.

Url:
DOI: 10.1111/j.1752-8062.2008.00070.x


Affiliations:


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ISTEX:237572302112A935F98DA47984194D457312F603

Le document en format XML

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<term>Amino acid</term>
<term>Antitumor</term>
<term>Antitumor activity</term>
<term>Axillary lymph nodes</term>
<term>Black line</term>
<term>Cancer patients</term>
<term>Carneiro</term>
<term>Cell depletion</term>
<term>Cell lines</term>
<term>Cell permeabilization</term>
<term>Cell responses</term>
<term>Clin cancer</term>
<term>Combinatorial</term>
<term>Combinatorial approach</term>
<term>Control peptide</term>
<term>Cyclophosphamide</term>
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<term>Effector function</term>
<term>Entire mesothelin protein</term>
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<term>Facs buffer</term>
<term>Flow cytometric analysis</term>
<term>Flow cytometry</term>
<term>Further evaluation</term>
<term>Gray line</term>
<term>Hind limb</term>
<term>Humidified atmosphere</term>
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<term>Johns hopkins university</term>
<term>Kinetic profile</term>
<term>Licensing agreement</term>
<term>Life technologies</term>
<term>Lymph nodes</term>
<term>Lymphocyte</term>
<term>Mammary tumors</term>
<term>Mesothelin</term>
<term>Mesothelin epitopes</term>
<term>Mesothelin expression</term>
<term>Mice vaccinated</term>
<term>Mock vaccine</term>
<term>Monoclonal antibody</term>
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<term>Mouse models</term>
<term>Multiple mechanisms</term>
<term>Murine</term>
<term>Ovarian cancers</term>
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<term>Pancreatic cancers</term>
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<term>Proc natl acad</term>
<term>Regulatory</term>
<term>Regulatory cell depletion</term>
<term>Regulatory cells</term>
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<term>Representative experiment</term>
<term>Right flank</term>
<term>Room temperature</term>
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<term>Similar results</term>
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<term>Specific peptide</term>
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<term>Splenocytes</term>
<term>Subcutaneous injections</term>
<term>Survival curves</term>
<term>Target antigen</term>
<term>Target cells</term>
<term>Total number</term>
<term>Total population</term>
<term>Treg</term>
<term>Treg cell depletion</term>
<term>Treg cells</term>
<term>Treg depletion</term>
<term>Tregs</term>
<term>Tumor</term>
<term>Tumor antigens</term>
<term>Tumor cells</term>
<term>Tumor challenge</term>
<term>Tumor clearance</term>
<term>Tumor immunity</term>
<term>Tumor inoculation</term>
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<term>Vaccine</term>
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<div type="abstract" xml:lang="en">Vaccine‐induced CD8+ T‐cell responses can eradicate developing tumors in vivo in mouse models. Translating these successes into approved treatments for cancer patients has been challenging, since many of these models lack expression of clinically proven/relevant tumor antigens. We have shown that mesothelin is a clinically relevant CD8+ T‐cell target in human pancreas cancer, which is also highly conserved among species. Here, we utilize the murine mesothelin‐expressing pancreatic tumor model (Panc02) to identify the immune‐relevant mesothelin‐derived peptides and study interventions that enhance the antitumor response. We first screened overlapping peptides of the entire murine mesothelin protein to identify two new CD8+ mesothelin‐restricted epitopes. These peptides were then evaluated for recognition by vaccine‐induced T cells from mice treated with vaccine in sequence with low‐dose cyclophosphamide (CY) and an anti‐CD25 IL‐2Rα monoclonal antibody (PC61). These treatments are both known to deplete subpopulations of T regulatory cells (Tregs). Our findings demonstrate that combined Treg‐depleting therapies synergize to enhance vaccine efficacy. Furthermore, our data supports mesothelin as a relevant antigen in murine and clinical models and the use of Panc02 as a clinically relevant murine model of pancreatic cancer for evaluating antigen‐targeted immunotherapies in immune‐tolerant hosts.</div>
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