The inhibitor of autophagy SBI-0206965 aggravates atherosclerosis through decreasing myeloid-derived suppressor cells
Identifieur interne : 000522 ( Pmc/Corpus ); précédent : 000521; suivant : 000523The inhibitor of autophagy SBI-0206965 aggravates atherosclerosis through decreasing myeloid-derived suppressor cells
Auteurs : Bo Wang ; Guanjun Dong ; Qingqiing Zhang ; Fenglian Yan ; Zhihua Li ; Chunxia Li ; Hui Zhang ; Qun Ma ; Jun Dai ; Chuanping Si ; Huabao XiongSource :
- Experimental and Therapeutic Medicine [ 1792-0981 ] ; 2019.
Abstract
Atherosclerosis (AS) is currently the leading cause of mortality worldwide, with the development of new strategies to prevent the formation and rupture of atherosclerotic plaques being a paramount area of research. Amounting evidence suggests autophagy has an important role in the pathogenesis of AS and may be a potential therapeutic target. In this study, the effect of SBI-0206965(6965), a novel inhibitor of autophagy, was tested on the development of AS in apolipoprotein E deficient (ApoE−/−) mice. Systemic application of 6965 was found to aggravate AS, with increased plaque size and decreased plaque stability in comparison with the control. Of note, it was observed that 6965 decreased the proportion of myeloid-derived suppressor cells (MDSCs). Further investigation demonstrated MDSCs markedly alleviated AS in ApoE−/− mice; while 6965 reduced the viability and promoted apoptosis of MDSCs
Url:
DOI: 10.3892/etm.2019.8317
PubMed: 32010311
PubMed Central: 6966176
Links to Exploration step
PMC:6966176Le document en format XML
<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">The inhibitor of autophagy SBI-0206965 aggravates atherosclerosis through decreasing myeloid-derived suppressor cells</title><author><name sortKey="Wang, Bo" sort="Wang, Bo" uniqKey="Wang B" first="Bo" last="Wang">Bo Wang</name><affiliation><nlm:aff id="af1-etm-0-0-8317">Institute of Forensic Medicine and Laboratory Medicine, Jining Medical University, Jining, Shandong 272067, P.R. China</nlm:aff></affiliation><affiliation><nlm:aff id="af2-etm-0-0-8317">Institute of Immunology and Molecular Medicine, Jining Medical University, Jining, Shandong 272067, P.R. China</nlm:aff></affiliation></author><author><name sortKey="Dong, Guanjun" sort="Dong, Guanjun" uniqKey="Dong G" first="Guanjun" last="Dong">Guanjun Dong</name><affiliation><nlm:aff id="af2-etm-0-0-8317">Institute of Immunology and Molecular Medicine, Jining Medical University, Jining, Shandong 272067, P.R. China</nlm:aff></affiliation></author><author><name sortKey="Zhang, Qingqiing" sort="Zhang, Qingqiing" uniqKey="Zhang Q" first="Qingqiing" last="Zhang">Qingqiing Zhang</name><affiliation><nlm:aff id="af2-etm-0-0-8317">Institute of Immunology and Molecular Medicine, Jining Medical University, Jining, Shandong 272067, P.R. China</nlm:aff></affiliation></author><author><name sortKey="Yan, Fenglian" sort="Yan, Fenglian" uniqKey="Yan F" first="Fenglian" last="Yan">Fenglian Yan</name><affiliation><nlm:aff id="af2-etm-0-0-8317">Institute of Immunology and Molecular Medicine, Jining Medical University, Jining, Shandong 272067, P.R. China</nlm:aff></affiliation></author><author><name sortKey="Li, Zhihua" sort="Li, Zhihua" uniqKey="Li Z" first="Zhihua" last="Li">Zhihua Li</name><affiliation><nlm:aff id="af2-etm-0-0-8317">Institute of Immunology and Molecular Medicine, Jining Medical University, Jining, Shandong 272067, P.R. China</nlm:aff></affiliation></author><author><name sortKey="Li, Chunxia" sort="Li, Chunxia" uniqKey="Li C" first="Chunxia" last="Li">Chunxia Li</name><affiliation><nlm:aff id="af2-etm-0-0-8317">Institute of Immunology and Molecular Medicine, Jining Medical University, Jining, Shandong 272067, P.R. China</nlm:aff></affiliation></author><author><name sortKey="Zhang, Hui" sort="Zhang, Hui" uniqKey="Zhang H" first="Hui" last="Zhang">Hui Zhang</name><affiliation><nlm:aff id="af2-etm-0-0-8317">Institute of Immunology and Molecular Medicine, Jining Medical University, Jining, Shandong 272067, P.R. China</nlm:aff></affiliation></author><author><name sortKey="Ma, Qun" sort="Ma, Qun" uniqKey="Ma Q" first="Qun" last="Ma">Qun Ma</name><affiliation><nlm:aff id="af2-etm-0-0-8317">Institute of Immunology and Molecular Medicine, Jining Medical University, Jining, Shandong 272067, P.R. China</nlm:aff></affiliation></author><author><name sortKey="Dai, Jun" sort="Dai, Jun" uniqKey="Dai J" first="Jun" last="Dai">Jun Dai</name><affiliation><nlm:aff id="af2-etm-0-0-8317">Institute of Immunology and Molecular Medicine, Jining Medical University, Jining, Shandong 272067, P.R. China</nlm:aff></affiliation></author><author><name sortKey="Si, Chuanping" sort="Si, Chuanping" uniqKey="Si C" first="Chuanping" last="Si">Chuanping Si</name><affiliation><nlm:aff id="af2-etm-0-0-8317">Institute of Immunology and Molecular Medicine, Jining Medical University, Jining, Shandong 272067, P.R. China</nlm:aff></affiliation></author><author><name sortKey="Xiong, Huabao" sort="Xiong, Huabao" uniqKey="Xiong H" first="Huabao" last="Xiong">Huabao Xiong</name><affiliation><nlm:aff id="af3-etm-0-0-8317">Department of Medicine, Immunology Institute, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA</nlm:aff></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">PMC</idno><idno type="pmid">32010311</idno><idno type="pmc">6966176</idno><idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6966176</idno><idno type="RBID">PMC:6966176</idno><idno type="doi">10.3892/etm.2019.8317</idno><date when="2019">2019</date><idno type="wicri:Area/Pmc/Corpus">000522</idno><idno type="wicri:explorRef" wicri:stream="Pmc" wicri:step="Corpus" wicri:corpus="PMC">000522</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">The inhibitor of autophagy SBI-0206965 aggravates atherosclerosis through decreasing myeloid-derived suppressor cells</title><author><name sortKey="Wang, Bo" sort="Wang, Bo" uniqKey="Wang B" first="Bo" last="Wang">Bo Wang</name><affiliation><nlm:aff id="af1-etm-0-0-8317">Institute of Forensic Medicine and Laboratory Medicine, Jining Medical University, Jining, Shandong 272067, P.R. China</nlm:aff></affiliation><affiliation><nlm:aff id="af2-etm-0-0-8317">Institute of Immunology and Molecular Medicine, Jining Medical University, Jining, Shandong 272067, P.R. China</nlm:aff></affiliation></author><author><name sortKey="Dong, Guanjun" sort="Dong, Guanjun" uniqKey="Dong G" first="Guanjun" last="Dong">Guanjun Dong</name><affiliation><nlm:aff id="af2-etm-0-0-8317">Institute of Immunology and Molecular Medicine, Jining Medical University, Jining, Shandong 272067, P.R. China</nlm:aff></affiliation></author><author><name sortKey="Zhang, Qingqiing" sort="Zhang, Qingqiing" uniqKey="Zhang Q" first="Qingqiing" last="Zhang">Qingqiing Zhang</name><affiliation><nlm:aff id="af2-etm-0-0-8317">Institute of Immunology and Molecular Medicine, Jining Medical University, Jining, Shandong 272067, P.R. China</nlm:aff></affiliation></author><author><name sortKey="Yan, Fenglian" sort="Yan, Fenglian" uniqKey="Yan F" first="Fenglian" last="Yan">Fenglian Yan</name><affiliation><nlm:aff id="af2-etm-0-0-8317">Institute of Immunology and Molecular Medicine, Jining Medical University, Jining, Shandong 272067, P.R. China</nlm:aff></affiliation></author><author><name sortKey="Li, Zhihua" sort="Li, Zhihua" uniqKey="Li Z" first="Zhihua" last="Li">Zhihua Li</name><affiliation><nlm:aff id="af2-etm-0-0-8317">Institute of Immunology and Molecular Medicine, Jining Medical University, Jining, Shandong 272067, P.R. China</nlm:aff></affiliation></author><author><name sortKey="Li, Chunxia" sort="Li, Chunxia" uniqKey="Li C" first="Chunxia" last="Li">Chunxia Li</name><affiliation><nlm:aff id="af2-etm-0-0-8317">Institute of Immunology and Molecular Medicine, Jining Medical University, Jining, Shandong 272067, P.R. China</nlm:aff></affiliation></author><author><name sortKey="Zhang, Hui" sort="Zhang, Hui" uniqKey="Zhang H" first="Hui" last="Zhang">Hui Zhang</name><affiliation><nlm:aff id="af2-etm-0-0-8317">Institute of Immunology and Molecular Medicine, Jining Medical University, Jining, Shandong 272067, P.R. China</nlm:aff></affiliation></author><author><name sortKey="Ma, Qun" sort="Ma, Qun" uniqKey="Ma Q" first="Qun" last="Ma">Qun Ma</name><affiliation><nlm:aff id="af2-etm-0-0-8317">Institute of Immunology and Molecular Medicine, Jining Medical University, Jining, Shandong 272067, P.R. China</nlm:aff></affiliation></author><author><name sortKey="Dai, Jun" sort="Dai, Jun" uniqKey="Dai J" first="Jun" last="Dai">Jun Dai</name><affiliation><nlm:aff id="af2-etm-0-0-8317">Institute of Immunology and Molecular Medicine, Jining Medical University, Jining, Shandong 272067, P.R. China</nlm:aff></affiliation></author><author><name sortKey="Si, Chuanping" sort="Si, Chuanping" uniqKey="Si C" first="Chuanping" last="Si">Chuanping Si</name><affiliation><nlm:aff id="af2-etm-0-0-8317">Institute of Immunology and Molecular Medicine, Jining Medical University, Jining, Shandong 272067, P.R. China</nlm:aff></affiliation></author><author><name sortKey="Xiong, Huabao" sort="Xiong, Huabao" uniqKey="Xiong H" first="Huabao" last="Xiong">Huabao Xiong</name><affiliation><nlm:aff id="af3-etm-0-0-8317">Department of Medicine, Immunology Institute, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA</nlm:aff></affiliation></author></analytic><series><title level="j">Experimental and Therapeutic Medicine</title><idno type="ISSN">1792-0981</idno><idno type="eISSN">1792-1015</idno><imprint><date when="2019">2019</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><p>Atherosclerosis (AS) is currently the leading cause of mortality worldwide, with the development of new strategies to prevent the formation and rupture of atherosclerotic plaques being a paramount area of research. Amounting evidence suggests autophagy has an important role in the pathogenesis of AS and may be a potential therapeutic target. In this study, the effect of SBI-0206965(6965), a novel inhibitor of autophagy, was tested on the development of AS in apolipoprotein E deficient (ApoE<sup>−/−</sup>) mice. Systemic application of 6965 was found to aggravate AS, with increased plaque size and decreased plaque stability in comparison with the control. Of note, it was observed that 6965 decreased the proportion of myeloid-derived suppressor cells (MDSCs). Further investigation demonstrated MDSCs markedly alleviated AS in ApoE<sup>−/−</sup> mice; while 6965 reduced the viability and promoted apoptosis of MDSCs <italic>in vitro</italic>. This is the first study describing an association between autophagy and MDSCs in AS models, providing a novel mechanism to potentially target in the management of this condition.</p></div></front><back><div1 type="bibliography"><listBibl><biblStruct><analytic><author><name sortKey="Lusis, Aj" uniqKey="Lusis A">AJ Lusis</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Zhu, Y" uniqKey="Zhu Y">Y Zhu</name></author><author><name sortKey="Xian, X" uniqKey="Xian X">X Xian</name></author><author><name sortKey="Wang, Z" uniqKey="Wang Z">Z Wang</name></author><author><name sortKey="Bi, Y" uniqKey="Bi Y">Y Bi</name></author><author><name sortKey="Chen, Q" uniqKey="Chen Q">Q Chen</name></author><author><name sortKey="Han, X" uniqKey="Han X">X Han</name></author><author><name sortKey="Tang, D" uniqKey="Tang D">D Tang</name></author><author><name sortKey="Chen, R" uniqKey="Chen R">R Chen</name></author></analytic></biblStruct><biblStruct><analytic><author><name 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<front><journal-meta><journal-id journal-id-type="nlm-ta">Exp Ther Med</journal-id><journal-id journal-id-type="iso-abbrev">Exp Ther Med</journal-id><journal-id journal-id-type="publisher-id">ETM</journal-id><journal-title-group><journal-title>Experimental and Therapeutic Medicine</journal-title></journal-title-group><issn pub-type="ppub">1792-0981</issn><issn pub-type="epub">1792-1015</issn><publisher><publisher-name>D.A. Spandidos</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="pmid">32010311</article-id><article-id pub-id-type="pmc">6966176</article-id><article-id pub-id-type="doi">10.3892/etm.2019.8317</article-id><article-id pub-id-type="publisher-id">ETM-0-0-8317</article-id><article-categories><subj-group subj-group-type="heading"><subject>Articles</subject></subj-group></article-categories><title-group><article-title>The inhibitor of autophagy SBI-0206965 aggravates atherosclerosis through decreasing myeloid-derived suppressor cells</article-title></title-group><contrib-group><contrib contrib-type="author"><name><surname>Wang</surname><given-names>Bo</given-names></name><xref ref-type="aff" rid="af1-etm-0-0-8317">1</xref><xref ref-type="aff" rid="af2-etm-0-0-8317">2</xref></contrib><contrib contrib-type="author"><name><surname>Dong</surname><given-names>Guanjun</given-names></name><xref ref-type="aff" rid="af2-etm-0-0-8317">2</xref></contrib><contrib contrib-type="author"><name><surname>Zhang</surname><given-names>Qingqiing</given-names></name><xref ref-type="aff" rid="af2-etm-0-0-8317">2</xref></contrib><contrib contrib-type="author"><name><surname>Yan</surname><given-names>Fenglian</given-names></name><xref ref-type="aff" rid="af2-etm-0-0-8317">2</xref></contrib><contrib contrib-type="author"><name><surname>Li</surname><given-names>Zhihua</given-names></name><xref ref-type="aff" rid="af2-etm-0-0-8317">2</xref></contrib><contrib contrib-type="author"><name><surname>Li</surname><given-names>Chunxia</given-names></name><xref ref-type="aff" rid="af2-etm-0-0-8317">2</xref></contrib><contrib contrib-type="author"><name><surname>Zhang</surname><given-names>Hui</given-names></name><xref ref-type="aff" rid="af2-etm-0-0-8317">2</xref></contrib><contrib contrib-type="author"><name><surname>Ma</surname><given-names>Qun</given-names></name><xref ref-type="aff" rid="af2-etm-0-0-8317">2</xref></contrib><contrib contrib-type="author"><name><surname>Dai</surname><given-names>Jun</given-names></name><xref ref-type="aff" rid="af2-etm-0-0-8317">2</xref></contrib><contrib contrib-type="author"><name><surname>Si</surname><given-names>Chuanping</given-names></name><xref ref-type="aff" rid="af2-etm-0-0-8317">2</xref></contrib><contrib contrib-type="author"><name><surname>Xiong</surname><given-names>Huabao</given-names></name><xref ref-type="aff" rid="af3-etm-0-0-8317">3</xref><xref rid="c1-etm-0-0-8317" ref-type="corresp"></xref></contrib></contrib-group><aff id="af1-etm-0-0-8317"><label>1</label>Institute of Forensic Medicine and Laboratory Medicine, Jining Medical University, Jining, Shandong 272067, P.R. China</aff><aff id="af2-etm-0-0-8317"><label>2</label>Institute of Immunology and Molecular Medicine, Jining Medical University, Jining, Shandong 272067, P.R. China</aff><aff id="af3-etm-0-0-8317"><label>3</label>Department of Medicine, Immunology Institute, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA</aff><author-notes><corresp id="c1-etm-0-0-8317"><italic>Correspondence to</italic>: Dr Huabao Xiong, Department of Medicine, Immunology Institute, Icahn School of Medicine at Mount Sinai, 1468 Madison Avenue, New York, NY 10029, USA, E-mail: <email>huabao.xiong@mssm.edu</email></corresp></author-notes><pub-date pub-type="ppub"><month>2</month><year>2020</year></pub-date><pub-date pub-type="epub"><day>11</day><month>12</month><year>2019</year></pub-date><pub-date pub-type="pmc-release"><day>11</day><month>12</month><year>2019</year></pub-date><pmc-comment> PMC Release delay is 0 months and 0 days and was based on the
<volume>19</volume><issue>2</issue><fpage>1370</fpage><lpage>1378</lpage><history><date date-type="received"><day>19</day><month>4</month><year>2019</year></date><date date-type="accepted"><day>14</day><month>11</month><year>2019</year></date></history><permissions><copyright-statement>Copyright: © Wang et al.</copyright-statement><copyright-year>2020</copyright-year><license license-type="open-access"><license-p>This is an open access article distributed under the terms of the <ext-link ext-link-type="uri" xlink:href="https://creativecommons.org/licenses/by-nc-nd/4.0/">Creative Commons Attribution-NonCommercial-NoDerivs License</ext-link>, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.</license-p></license></permissions><abstract><p>Atherosclerosis (AS) is currently the leading cause of mortality worldwide, with the development of new strategies to prevent the formation and rupture of atherosclerotic plaques being a paramount area of research. Amounting evidence suggests autophagy has an important role in the pathogenesis of AS and may be a potential therapeutic target. In this study, the effect of SBI-0206965(6965), a novel inhibitor of autophagy, was tested on the development of AS in apolipoprotein E deficient (ApoE<sup>−/−</sup>) mice. Systemic application of 6965 was found to aggravate AS, with increased plaque size and decreased plaque stability in comparison with the control. Of note, it was observed that 6965 decreased the proportion of myeloid-derived suppressor cells (MDSCs). Further investigation demonstrated MDSCs markedly alleviated AS in ApoE<sup>−/−</sup> mice; while 6965 reduced the viability and promoted apoptosis of MDSCs <italic>in vitro</italic>. This is the first study describing an association between autophagy and MDSCs in AS models, providing a novel mechanism to potentially target in the management of this condition.</p></abstract><kwd-group><kwd>autophagy</kwd><kwd>SBI-0206965</kwd><kwd>atherosclerosis</kwd><kwd>plaque stability</kwd><kwd>myeloid-derived suppressor cells</kwd></kwd-group></article-meta></front><body><sec sec-type="intro"><title>Introduction</title><p>Atherosclerosis (AS) is a chronic inflammatory disease characterized by the formation of plaques in the walls of large and medium-sized arteries (<xref rid="b1-etm-0-0-8317" ref-type="bibr">1</xref>). Unstable atherosclerotic plaques-especially those with scarce smooth muscle cells (SMCs) and increased inflammation and apoptosis-are closely related to numerous diseases, including acute coronary syndrome, myocardial infarction and stroke (<xref rid="b2-etm-0-0-8317" ref-type="bibr">2</xref>). Notwithstanding the numerous available therapeutic alternatives, AS remains the leading cause of mortality worldwide. Therefore, the development of novel strategies to prevent the formation and rupture of plaques has become a paramount area of research.</p><p>Macroautophagy (hereafter referred to as autophagy) is an evolutionarily conserved mechanism which eliminates various intracellular components such as damaged proteins, lipid droplets and organelles. Accumulating evidence suggests autophagy has an important role in the pathogenesis of AS and related disorders (<xref rid="b3-etm-0-0-8317" ref-type="bibr">3</xref>–<xref rid="b5-etm-0-0-8317" ref-type="bibr">5</xref>). Basal autophagy maintains cellular lipid homeostasis (<xref rid="b6-etm-0-0-8317" ref-type="bibr">6</xref>–<xref rid="b9-etm-0-0-8317" ref-type="bibr">9</xref>) and the induction of autophagy has been observed to prevent AS (<xref rid="b10-etm-0-0-8317" ref-type="bibr">10</xref>–<xref rid="b13-etm-0-0-8317" ref-type="bibr">13</xref>). However, previous research shows conflicting results concerning the impact of the inhibition of autophagy on AS with some studies indicating impaired autophagy promotes this process (<xref rid="b14-etm-0-0-8317" ref-type="bibr">14</xref>–<xref rid="b18-etm-0-0-8317" ref-type="bibr">18</xref>) and others suggesting otherwise. For example, Chen <italic>et al</italic> (<xref rid="b19-etm-0-0-8317" ref-type="bibr">19</xref>) found inhibition of autophagy in endothelial cells provided anti-atherosclerotic effects. Similarly, Dai <italic>et al</italic> (<xref rid="b20-etm-0-0-8317" ref-type="bibr">20</xref>) found 3-methyladenine (3-MA), a widely used inhibitor of autophagy, hindered the formation of atherosclerotic lesions and increased plaque stabilization. Further research is needed to elucidate the effects and molecular mechanisms of autophagy in AS, in order to explore potential therapeutic targets.</p><p>SBI-0206965 (hereafter referred to 6965) is a newly discovered inhibitor of the uncoordinated (Unc) 51-like kinase 1 (ULK1), which plays a pivotal role in autophagy. As the only conserved serine/threonine kinase in autophagy, ULK1 has become a very attractive target for therapeutic development (<xref rid="b21-etm-0-0-8317" ref-type="bibr">21</xref>). 6965 has also been observed to suppress autophagy induced by inhibition of mammalian target of rapamycin (<xref rid="b22-etm-0-0-8317" ref-type="bibr">22</xref>), inhibit AMP-activated protein kinase (<xref rid="b23-etm-0-0-8317" ref-type="bibr">23</xref>) and induce apoptosis (<xref rid="b24-etm-0-0-8317" ref-type="bibr">24</xref>). In one of the authors' previous studies (<xref rid="b25-etm-0-0-8317" ref-type="bibr">25</xref>), it was reported that 6965 regulated the functionality of granulocytic myeloid-derived suppressor cells (MDSCs), which have been linked to the development of AS (<xref rid="b26-etm-0-0-8317" ref-type="bibr">26</xref>).</p><p>The present study systemically administered 6965 to apolipoprotein E deficient (ApoE<sup>−/−</sup>) mice fed with a high-fat diet (HFD) and assessed its effect on AS. The current study found that 6965 promoted the formation of atherosclerotic lesions and reduced plaque stability. Interestingly, lower levels of cluster of differentiation (CD)11b<sup>+</sup>Gr-1<sup>+</sup> MDSCs were also detected following treatment with 6965. Subsequent <italic>in vitro</italic> experiments revealed 6965 reduced the viability and promoted the apoptosis of MDSCs in the presence of oxidized low-density lipoprotein (oxLDL). Adoptive transfer of MDSCs impaired the development of atherosclerotic plaques in ApoE<sup>−/−</sup> mice. In consonance, these results suggest inhibition of autophagy by 6965 intervenes in the pathophysiology of AS by decreasing levels of MDSCs, outlining the mechanisms underlying the role of autophagy in this process.</p></sec><sec sec-type="materials|methods"><title>Materials and methods</title><sec><title></title><sec><title>Animals</title><p>A total of 40 ApoE<sup>−/−</sup> mice (19–21.5 g) were purchased from Beijing Vital River Laboratory Animal Technology Co., Ltd., and kept in a specific pathogen-free environment. All experiments were conducted according to the institutional guidelines for animal care and use, and ethical approval was obtained prior to the start of the study from an ethics committee of the Jining Medical University (approval number: 2019-FJ-002). The mice were housed at a constant temperature (22°C) and relative humidity 40–70% under a 12 h dark/12 h light cycle. All mice had access to water and food <italic>ad libitum</italic>. To induce AS, 8-week old male ApoE<sup>−/−</sup> mice were fed an HFD (0.25% cholesterol and 15% cocoa butter) for 6 weeks. After one week of HFD, the mice were randomly divided into two groups (n=6 per group): The 6965-treated group, which was injected intraperitoneally with 6965 (Selleck Chemicals), 150 µg/mouse once per week for 4 weeks; and a control group of ApoE<sup>−/−</sup> AS mice injected with PBS following the same pattern. One week after the last treatment, the mice were sacrificed and the tissues were harvested for further use. In the experiment with the adoptive transferring of MDSCs, mice were fed an HFD for 6 weeks. During this time, mice (n=6 per group) received an intravenous injection of 6×10<sup>6</sup> MDSCs or PBS every 10 days in the experimental and control groups, respectively.</p></sec><sec><title>Serum cholesterol levels</title><p>Blood samples (110 µl per mouse) were collected by retro-orbital bleed following general anesthesia (2–4% ether inhalation anesthesia) according to ethical approvals (<xref rid="b27-etm-0-0-8317" ref-type="bibr">27</xref>,<xref rid="b28-etm-0-0-8317" ref-type="bibr">28</xref>). After 30 min of incubation at room temperature, samples were centrifuged at 2,775 × g at room temperature for 10 min to obtain serum, which was stored at −80°C until analysis. Total plasma cholesterol and total triglyceride levels were determined with automated enzymatic techniques (7080; Hitachi, Ltd.).</p></sec><sec><title>Histopathology and immunohistochemistry (IHC)</title><p>After sacrificing, mice were perfused with PBS via the left cardiac ventricle and their hearts and aortic roots were harvested, fixed in 4% paraformaldehyde at room temperature overnight and embedded with paraffin. Serial paraffin sections of 4–6 µm were dissected longitudinally. At least three sections were obtained from each aortic root, with 50 µm of separation between each other. After staining with hematoxylin and eosin (H&E) for 15 and 5 min, respectively (both at room temperature), sections were blocked using 5% goat serum (Beijing Solarbio Science & Technology Co., Ltd.) at room temperature for 30 min. Corresponding sections on separate sliders were then stained for various antibodies at 37°C for 1 h. The antibodies used included Anti-F4/80 (1:400; cat. no. ab111101; Abcam), rabbit anti-α smooth muscle actin (1:200; cat. no. bs-10196R; Biosynthesis Biotechnology Co., Ltd.) or anti-mouse Gr-1 (1:50; cat. no. 108436; Biolegend). The Rabbit two-step test kit (cat. no. PV-9001; Origene Technologies, Inc.) was used for the secondary antibody binding procedure, and the staining with secondary antibodies was performed at 37°C for 15 min, according to the manufacturer's protocol. Terminal deoxynucleotidyl transferase-mediated dUTP nick end labelling (TUNEL) was performed on paraffin sections with a TUNEL kit (Roche Diagnostics) following the manufacturer's protocol in order to assess apoptosis. Images were captured using an Olympus fluorescence/light microscope (IX71; Olympus Corporation) and positive staining was quantified by computer-assisted histomorphometry (Image-Pro Plus 6.0, Media Cybernetics, Inc.). To evaluate vascular obstruction, the ratio of total plaque area to aortic root cross sectional area was calculated. For each IHC analysis, it was calculated as the percentage of immunostained area in relation to the total area. Mean values were calculated from the corresponding three consecutive sections from each mouse.</p></sec><sec><title>Flow cytometry</title><p>After sacrificing the mice, blood, bone marrow and spleen cells were harvested from each group (n=6 per group). Red blood cells were removed using erythrocyte lysis buffer [Multi Sciences (Lianke) Biotech, Co., Ltd.]. Then, the remaining cells were washed with PBS and resuspended in proportions of 1×10<sup>6</sup> cells per ml. Fluorescently labeled antibodies against CD11b (FITC-labeled) and Gr-1 (APC-labeled) were purchased from Biolegend and used at a 1:100 dilution to detect MDSCs (CD11b<sup>+</sup>, Gr-1<sup>+</sup>). Flow cytometry was also performed to detect the apoptosis of cells stained with the Annexin V-PI kit (Annexin V-FITC Apoptosis Detection kit; Biouniquer) according to the manufacturer's protocol.</p></sec><sec><title>Adoptive transfer of MDSCs</title><p>Bone marrow-derived MDSCs were obtained as described previously (<xref rid="b25-etm-0-0-8317" ref-type="bibr">25</xref>). In brief, bone marrow cells were isolated from the tibias and femurs of ApoE<sup>−/−</sup> mice. Then, these were cultured in complete DMEM, which was supplemented and stimulated with combinations of granulocyte macrophage colony stimulating factor (GM-CSF) (40 ng/ml, PeproTech, Inc.) and interleukin (IL)-6 (40 ng/ml, PeproTech, Inc.). The cultures were maintained during 4 days in an atmosphere humidified with 5% CO<sub>2</sub> at 37°C with the objective of inducing MDSCs. The experimental group of ApoE<sup>−/−</sup> mice which underwent adoptive transfer (n=6) received MDSCs suspended in PBS via intravenous injection. Each animal received 6×10<sup>6</sup> cells every 10 days during 6 weeks. The control group was injected with PBS only following the same schedule.</p></sec><sec><title>En face staining analysis</title><p>After the mice were sacrificed, the aortas were harvested from heart to the iliac arteries. Then, they were fixed in 4% paraformaldehyde overnight at room temperature and stained with 0.5% Oil Red O (O0625; Sigma-Aldrich; Merck KGaA) for 12 h at 4°C using a light microscope.</p></sec><sec><title>CCK-8 assay</title><p>Cell viability was tested using Cell Counting Kit-8 (CCK-8) assays (HY-K0301; MedChemExpress) according to the manufacturer's protocols. Mouse MDSCs were seeded in 96-well cell culture plates at 5×10<sup>3</sup> cells per well and divided into two groups: One subjected to oxLDL (25 µg/ml) treatment only, and one preincubated with 6965 (10 µM) for 30 min before treatment with oxLDL. Next, the cells were cultured at 37°C for 24, 48 and 72 h respectively, and then incubated with 10 µk CCK-8 solution at 37°C for 1 h. Well absorbance was set to 450 nm. Each treatment was performed in triplicate.</p></sec><sec><title>Statistical analysis</title><p>Data were expressed as the mean ± standard deviation. Unpaired Student's t-test was used to compare data between different groups. Results were considered significant when P<0.05. Statistical analysis was performed with GraphPad Prism 5.0 software (GraphPad Software, Inc.).</p></sec></sec></sec><sec sec-type="results"><title>Results</title><sec><title></title><sec><title>6965 increases the size of atherosclerotic plaques independent of lipid levels</title><p>To investigate the effects of 6965 on AS, eight-week old male ApoE<sup>−/−</sup> mice were fed an HFD for 6 weeks total in order to induce AS. After one week of HFD, the 6965-treated group was injected intraperitoneally with 6965 for 4 weeks. One week after the last treatment, the mice were sacrificed and analyzed. As shown in <xref rid="f1-etm-0-0-8317" ref-type="fig">Fig. 1A</xref>, 6965 did not affect the lipid profile, including total cholesterol and triglyceride levels. H&E staining revealed 6965 administration was associated with significantly greater plaque size on aortic roots and obvious damage to the adventitia (P<0.05; <xref rid="f1-etm-0-0-8317" ref-type="fig">Fig. 1B</xref>). To assess vascular obstruction, the ratio of total plaque area to aortic root cross-sectional area was measured, and it was found that treatment with 6965 was related to significant increases in this parameter in comparison with the controls. Therefore, the present study surmised that 6965 increased aortic obstruction and aggravated AS independently of cholesterol and triglyceride levels.</p></sec><sec><title>6965 decreases the stability of atherosclerotic plaques</title><p>Plaque stability rather than size may be more important in the development of complications associated with AS. In order to evaluate the effects of 6965 on plaque stability, IHC staining was implemented to observe the proportions of SMC and infiltrated macrophages in local lesions; whereas the TUNEL method was used to assess levels of apoptosis. As shown in <xref rid="f2-etm-0-0-8317" ref-type="fig">Fig. 2</xref>, 6965 significantly increased the proportions of macrophages that presented as F4/80 and decreased the proportion of SMC in plaques (P<0.05). In addition, 6965 significantly increased the number of TUNEL-positive apoptotic cells (P<0.01). These results indicate treatment with 6965 reduced plaque stability.</p></sec><sec><title>6965 decreases the levels of MDSCs in atherosclerosis models with ApoE<sup>−/−</sup> mice</title><p>A recent study reported that CD11b<sup>+</sup> Gr-1<sup>+</sup> MDSCs reduce atherosclerotic plaques in LDLr<sup>−/−</sup> mice (<xref rid="b26-etm-0-0-8317" ref-type="bibr">26</xref>), suggesting these cells play an important role in the pathophysiology of AS. In this study, the proportions of CD11b<sup>+</sup> Gr-1<sup>+</sup> MDSCs in peripheral blood, spleen and bone marrow were determined by flow cytometry. The present study found treatment with 6965 significantly decreased the proportion of CD11b<sup>+</sup> Gr-1<sup>+</sup> MDSCs in comparison with controls. This was the case in the bone marrow, the spleen and the peripheral blood (P<0.05; <xref rid="f3-etm-0-0-8317" ref-type="fig">Fig. 3A</xref>). IHC staining of the lesions showed Gr-1<sup>+</sup> levels were also significantly decreased in 6965-treated mice (P<0.05; <xref rid="f3-etm-0-0-8317" ref-type="fig">Fig. 3B</xref>). This suggests 6965 intervenes in the pathogenesis of AS by lowering the levels of CD11b<sup>+</sup> Gr-1<sup>+</sup> MDSCs.</p></sec><sec><title>Adoptive transfer of MDSCs impairs the development of atherosclerotic plaques in ApoE<sup>−/−</sup> mice</title><p>To assess the role of MDSCs in AS, an adoptive transfer of MDSCs into ApoE<sup>−/−</sup> mice was performed. MDSCs were isolated from the bone marrow of ApoE<sup>−/−</sup> mice without HFD as described previously (<xref rid="b25-etm-0-0-8317" ref-type="bibr">25</xref>), and then injected intravenously in ApoE<sup>−/−</sup> atherosclerotic models. As expected, a significant reduction of atherosclerotic lesions in MDSCs-treated mice in both the aorta (P<0.05; <xref rid="f4-etm-0-0-8317" ref-type="fig">Fig. 4A</xref>) and aortic root (P<0.05; <xref rid="f4-etm-0-0-8317" ref-type="fig">Fig. 4B</xref>) in comparison with the controls was observed, which did not undergo adoptive transfer. This confirms the protective effect of MDSCs on AS in ApoE<sup>−/−</sup> mice.</p></sec><sec><title>6965 reduces the viability and increases the apoptosis of oxLDL-stimulated MDSCs</title><p>In order to investigate the impact of 6965 on MDSCs in AS, 6965-treated MDSCs from C57 mice were exposed to oxLDL <italic>in vitro</italic>. Assessment of CCK-8 levels revealed 6965 reduced MDSCs viability in the presence of oxLDL (<xref rid="f5-etm-0-0-8317" ref-type="fig">Fig. 5A</xref>). Cell Annexin V-PI staining showed 6965 significantly increased the proportion of apoptosis in the presence of oxLDL in comparison with exposure to oxLDL alone (P<0.001; <xref rid="f5-etm-0-0-8317" ref-type="fig">Fig. 5B</xref>).</p></sec></sec></sec><sec sec-type="discussion"><title>Discussion</title><p>Modulation of autophagy is an attractive potential alternative for the treatment of AS; therefore, it is a priority to focus research on the molecular mechanisms underlying this relationship in order to assess the feasibility and clinical applicability of autophagy-regulating agents. In this study, 6965, a novel inhibitor of ULK1, was found to enhance the formation of atherosclerotic lesions and reduced plaque stability; reflected in increased plaque size, reduced SMC content, and increased proportion of macrophage infiltration and apoptosis. Although a few studies have associated inhibition of autophagy with anti-atherosclerotic capacity (<xref rid="b19-etm-0-0-8317" ref-type="bibr">19</xref>,<xref rid="b20-etm-0-0-8317" ref-type="bibr">20</xref>), most studies harmonize with the present conclusions, where inhibition of autophagy results in aggravation of AS. The conflicting results may be due to the heterogeneous modes of action of the various molecules implemented to inhibit autophagy in previous studies. In this study, 6965, a highly selective inhibitor of ULK1 was used. This kinase is one of the most upstream components and the only serine/threonine kinase in the core autophagy pathway, representing an excellent drug target.</p><p>Notably, the proportion of CD11b<sup>+</sup>Gr-1<sup>+</sup> MDSCs were also found to be decreased after treatment with 6965. MDSCs are a heterogeneous population of cells, composed of early myeloid progenitor cells and immature myeloid cells. MDSCs can block hematoprogenitor cell differentiation and play a critical role in suppressing immune responses. Previous research has demonstrated that MDSCs are important immunosuppressive mediators in cancer and inflammatory disorders (<xref rid="b29-etm-0-0-8317" ref-type="bibr">29</xref>–<xref rid="b34-etm-0-0-8317" ref-type="bibr">34</xref>), including endotoxin shock, experimental autoimmune encephalomyelitis, graft-vs.-host disease, rheumatoid arthritis and diabetes. Recently, Foks <italic>et al</italic> (<xref rid="b26-etm-0-0-8317" ref-type="bibr">26</xref>) showed MDSCs reduced AS via suppression of pro-inflammatory immune responses in LDLr-deficient mice. To verify the effect of MDSCs on ApoE<sup>−/−</sup> AS models, MDSCs were transplanted into ApoE<sup>−/−</sup> mice, which resulted in amelioration of the atherosclerotic plaques. In the present study, it was found that treatment with 6965 was associated with a decrease in MDSCs levels. Considering MDSCs mainly migrate to inflamed tissue, Gr1<sup>+</sup> proportions were detected in atherosclerotic lesions and confirmed the decrease of MDSCs in local plaques in 6965-treated mice. Thus, the decrease of MDSCs may be a key mechanism underlying the of pro-atherosclerotic effects of 6965.</p><p>Numerous studies have identified autophagy as a major regulator of MDSC viability and function. Wu <italic>et al</italic> (<xref rid="b35-etm-0-0-8317" ref-type="bibr">35</xref>) demonstrated that the expression of autophagy marker LC3B and p62 was positively associated with MDSCs number. Parker <italic>et al</italic> (<xref rid="b36-etm-0-0-8317" ref-type="bibr">36</xref>) found that autophagy inhibitor chloroquine or bafilomycin reduced MDSCs viability. However, in another research, 3-MA did not induce MDSC-like cell model J774M cell death (<xref rid="b37-etm-0-0-8317" ref-type="bibr">37</xref>). In the authors' previous publication (<xref rid="b25-etm-0-0-8317" ref-type="bibr">25</xref>), inhibition of autophagy was found to contribute to the accumulation of granulocytic MDSCs in the context of endotoxin shock. In the present study, the influence of 6965 on MDSCs in the presence of oxLDL was appraised. The present results showed inhibition of autophagy by 6965 decreased MSDC viability and increased their apoptosis when exposed to oxLDL. It suggested that autophagy might regulate cell survival depending on the cellular context. Various conditions and effector molecules linking to autophagy are known to facilitate MDSC survival. For example, endoplasmic reticulum stress (ER stress) regulates MDSC half-life by controlling TRAIL receptor mediated apoptosis (<xref rid="b38-etm-0-0-8317" ref-type="bibr">38</xref>) and a novel study found that autophagy protected human umbilical vein endothelial cells against ER stress-mediated apoptosis (<xref rid="b39-etm-0-0-8317" ref-type="bibr">39</xref>). It is suggested that inhibition of autophagy might induce MDSC apoptosis through interruption of ER stress pathways. Moreover, increased apoptosis and impaired degradation capacity of lysosomes was observed in tumor-infiltrating autophagy deficient monocytic-MDSCs (<xref rid="b40-etm-0-0-8317" ref-type="bibr">40</xref>) which indicates that interruption of autophagy flux at the late stage induces cell death. Cytokines and chemokines, such as GM-CSF and IL-6, contributed to the expansion and accumulation of MDSCs (<xref rid="b41-etm-0-0-8317" ref-type="bibr">41</xref>). In the authors' previous study, 6965 treatment reduced the levels of IL-6, IL-12, tumor necrosis factor-α and CXCL9 in mice, which suggests that the influence of cytokines of 6965 might also affect the viability of MDSCs. Although there are numerous possible mechanisms, an accurate regulatory pathway remains to be determined.</p><p>In conclusion, 6965 may aggravate AS by reducing MDSCs functionality with a decrease in cell viability and the promotion of apoptosis being key related mechanisms. The present findings confirm the importance of autophagy in the pathophysiology of AS and highlight MDSCs as potential therapeutic targets in this condition.</p></sec></body><back><ack><title>Acknowledgements</title><p>Not applicable.</p></ack><sec><title>Funding</title><p>The present study was supported by the Doctoral Fund of Jining Medical University (grant no. 600353002) and the Teacher Research Support Fund of Jining Medical University (grant no. JYFC2018KJ058).</p></sec><sec sec-type="data-availability"><title>Availability of data and materials</title><p>The datasets used or analyzed during the current study are available from the corresponding author on reasonable request.</p></sec><sec><title>Authors' contributions</title><p>BW and HX designed the experiments. BW, QZ, HZ, ZL and CL performed animal experiments. GD performed flow cytometry. QZ and FY performed animal feeding, weighed mice and injected drugs. JD and BW performed cell culture and CCK-8 assays. CS and QM analyzed the data. BW wrote the manuscript. FY performed animal feeding and <italic>en face</italic> staining. 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orientation="portrait" position="float"><label>Figure 1.</label><caption><p>Treatment with 6965 promotes the development of atherosclerotic lesions independent of cholesterol levels. (A) Total plasma cholesterol and triglyceride levels of the control and 6965 groups. (B) Representative hematoxylin and eosin staining depicting the aortic roots from mice in the control and 6965-treated groups (magnification, ×20). Lesion area (µm<sup>2</sup>) represents the sum of all the areas occupied by plaques in every pathological section. Total plaque area (%) represents the ratio of total plaque area to the cross-sectional area of the aortic root. Data are shown as the mean ± standard deviation. *P<0.05 and **P<0.01 vs. the control.</p></caption><graphic xlink:href="etm-19-02-1370-g00"></graphic></fig><fig id="f2-etm-0-0-8317" orientation="portrait" position="float"><label>Figure 2.</label><caption><p>Treatment with 6965 decreases plaque stability. Representative images of (A) macrophages, (B) smooth muscle cells and (C) apoptosis from the control and 6965-treated groups (magnification, ×40). Macrophage and SMC contents were analyzed through immunohistochemistry. TUNEL staining was used to detect apoptotic cells. Data are presented as the percentage of stained plaque areas in the entirety of the lesions. Data are shown as the mean ± standard deviation. *P<0.05 and **P<0.01 vs. the control. TUNEL, Terminal deoxynucleotidyl transferase-mediated dUTP nick end labelling; SMC, smooth muscle cell.</p></caption><graphic xlink:href="etm-19-02-1370-g01"></graphic></fig><fig id="f3-etm-0-0-8317" orientation="portrait" position="float"><label>Figure 3.</label><caption><p>Treatment with 6965 decreases the levels of MDSCs. (A) Flow cytometry and fluorescent staining were used to evaluate the proportions of CD11b<sup>+</sup> Gr-1<sup>+</sup> MDSCs. Representative images of the bone marrow, spleen and peripheral blood from different groups are shown. Data are presented as the mean ± SD. *P<0.05 and **P<0.01. (B) The expression of Gr-1 in plaques was analyzed by immunohistochemistry and the percentage of Gr-1 positive area was calculated in the total lesioned area (magnification, ×40). Data are shown as the mean ± SD. *P<0.05 vs. the control. SD, standard deviation; CD, cluster of differentiation; MDSCs, myeloid-derived suppressor cells.</p></caption><graphic xlink:href="etm-19-02-1370-g02"></graphic></fig><fig id="f4-etm-0-0-8317" orientation="portrait" position="float"><label>Figure 4.</label><caption><p>Adoptive transfer of MDSCs reduces atherosclerotic lesions in ApoE<sup>−/−</sup> mice. (A) Representative images of oil red O-stained plaques in entire aortas (thoracic aorta and abdominal aorta) from the control and MDSC adoptive transfer groups (magnification, ×10). The black arrow indicates where the plaques are. (B) Representative cross-sections of lesions in the aortic valve area stained with hematoxylin and eosin are shown. Lesion area (µm<sup>2</sup>) represents the sum of all the areas occupied by plaques in every pathological section (magnification, ×20). Total plaque area (%) represents the ratio of total plaque area to the cross-sectional area of the aortic root. Data are shown as the mean ± standard deviation. *P<0.05 vs. the control. MDSCs, myeloid-derived suppressor cells; ApoE<sup>−/−</sup>, apolipoprotein E deficient.</p></caption><graphic xlink:href="etm-19-02-1370-g03"></graphic></fig><fig id="f5-etm-0-0-8317" orientation="portrait" position="float"><label>Figure 5.</label><caption><p>Treatment with 6965 decreases viability and increases apoptosis in oxLDL-stimulated MDSCs. (A) Cells were preincubated with 6965 (10 µM) for 30 min and then stimulated with 25 µg/ml oxLDL. Cell Counting Kit-8 assays were performed at different times after oxLDL stimulation to measure MSDC viability. (B) Flow cytometry detected MDSCs apoptosis. Data are shown as means ± standard deviation, calculated from triplicate experiments. *P<0.05 and ***P<0.001 vs. oxLDL. oxLDL, oxidized low density lipoprotein; MDSCs, myeloid-derived suppressor cells; PI, propidium iodide; OD, optical density.</p></caption><graphic xlink:href="etm-19-02-1370-g04"></graphic></fig></floats-group></pmc></record>Pour manipuler ce document sous Unix (Dilib)
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