CNSC-59. EPIGENETIC POTENTIATION OF ANTI-TUMOR IMMUNE RESPONSES USING VIRAL MIMICRY IN GLIOMAS

Abstract Clinical trials using immune checkpoint inhibition(ICI) have traditionally failed in glioblastoma (GBM). Viral mimicry, which augments anti-tumor immune responses and sensitizes response to immunotherapy in other cancers, involves the epigenetic activation of endogenous retroelements (REs)....

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Veröffentlicht in:Neuro-oncology (Charlottesville, Va.) Va.), 2024-11, Vol.26 (Supplement_8), p.viii54-viii54
Hauptverfasser: Chandar, Jay, Seetharam, Deepa, Desgraves, Jelisah, Ramsoomair, Christian, Castro, Jesus, Hudson, Anna, Govindarajan, Vaidya, Zhang, Yong, Sonabend, Adam, Valdez, Mynor Mendez, Maric, Dragan, Govindarajan, Vasundara, Rivas, Sarah, Lu, Victor, Alvarado, Alexandra, Tiwari, Ritika, Sharifi, Nima, DeMarino, Catherine, Johnson, Kory, De La Fuente, Macarena, Nasany, Ruham Alsiekh, Noviello, Teresa, Ivan, Michael, Komotar, Ricardo, Iavarone, Antonio, Nath, Avindra, Heiss, John, Ceccarelli, Michele, Chiappinelli, Katherine, Figueroa, Maria, Bayik, Defne, Shah, Ashish
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container_end_page viii54
container_issue Supplement_8
container_start_page viii54
container_title Neuro-oncology (Charlottesville, Va.)
container_volume 26
creator Chandar, Jay
Seetharam, Deepa
Desgraves, Jelisah
Ramsoomair, Christian
Castro, Jesus
Hudson, Anna
Govindarajan, Vaidya
Zhang, Yong
Sonabend, Adam
Valdez, Mynor Mendez
Maric, Dragan
Govindarajan, Vasundara
Rivas, Sarah
Lu, Victor
Alvarado, Alexandra
Tiwari, Ritika
Sharifi, Nima
DeMarino, Catherine
Johnson, Kory
De La Fuente, Macarena
Nasany, Ruham Alsiekh
Noviello, Teresa
Ivan, Michael
Komotar, Ricardo
Iavarone, Antonio
Nath, Avindra
Heiss, John
Ceccarelli, Michele
Chiappinelli, Katherine
Figueroa, Maria
Bayik, Defne
Shah, Ashish
description Abstract Clinical trials using immune checkpoint inhibition(ICI) have traditionally failed in glioblastoma (GBM). Viral mimicry, which augments anti-tumor immune responses and sensitizes response to immunotherapy in other cancers, involves the epigenetic activation of endogenous retroelements (REs). REs are silenced via the HUSH complex and H3K9me3. This process is mediated by ZNF638. We aimed to elucidate the role of viral mimicry in enhancing ICI through epigenetic reprogramming of the HUSH complex. We demonstrated that RE expression among 48 superfamilies inversely correlated with ZNF638 expression in gliomas, based on data from 71 newly-diagnosed GBMs. Using transcriptional deconvolution, we showed ZNF638 negatively correlates with innate antiviral immune response signatures(TLR3)(RTLR3=-0.300,pTLR3=0.00006). We validated these in-silico results in pure glioma cell lines, patient-derived GBM neurospheres, and syngeneic murine models. ZNF638 knockdown induced intracellular RE-mediated dsRNA signaling cascades via RIG-I and TLR3. This knockdown significantly increased PD-L1 expression(p50 days, p
doi_str_mv 10.1093/neuonc/noae165.0215
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EPIGENETIC POTENTIATION OF ANTI-TUMOR IMMUNE RESPONSES USING VIRAL MIMICRY IN GLIOMAS</title><source>Oxford University Press Journals Current</source><creator>Chandar, Jay ; Seetharam, Deepa ; Desgraves, Jelisah ; Ramsoomair, Christian ; Castro, Jesus ; Hudson, Anna ; Govindarajan, Vaidya ; Zhang, Yong ; Sonabend, Adam ; Valdez, Mynor Mendez ; Maric, Dragan ; Govindarajan, Vasundara ; Rivas, Sarah ; Lu, Victor ; Alvarado, Alexandra ; Tiwari, Ritika ; Sharifi, Nima ; DeMarino, Catherine ; Johnson, Kory ; De La Fuente, Macarena ; Nasany, Ruham Alsiekh ; Noviello, Teresa ; Ivan, Michael ; Komotar, Ricardo ; Iavarone, Antonio ; Nath, Avindra ; Heiss, John ; Ceccarelli, Michele ; Chiappinelli, Katherine ; Figueroa, Maria ; Bayik, Defne ; Shah, Ashish</creator><creatorcontrib>Chandar, Jay ; Seetharam, Deepa ; Desgraves, Jelisah ; Ramsoomair, Christian ; Castro, Jesus ; Hudson, Anna ; Govindarajan, Vaidya ; Zhang, Yong ; Sonabend, Adam ; Valdez, Mynor Mendez ; Maric, Dragan ; Govindarajan, Vasundara ; Rivas, Sarah ; Lu, Victor ; Alvarado, Alexandra ; Tiwari, Ritika ; Sharifi, Nima ; DeMarino, Catherine ; Johnson, Kory ; De La Fuente, Macarena ; Nasany, Ruham Alsiekh ; Noviello, Teresa ; Ivan, Michael ; Komotar, Ricardo ; Iavarone, Antonio ; Nath, Avindra ; Heiss, John ; Ceccarelli, Michele ; Chiappinelli, Katherine ; Figueroa, Maria ; Bayik, Defne ; Shah, Ashish</creatorcontrib><description>Abstract Clinical trials using immune checkpoint inhibition(ICI) have traditionally failed in glioblastoma (GBM). Viral mimicry, which augments anti-tumor immune responses and sensitizes response to immunotherapy in other cancers, involves the epigenetic activation of endogenous retroelements (REs). REs are silenced via the HUSH complex and H3K9me3. This process is mediated by ZNF638. We aimed to elucidate the role of viral mimicry in enhancing ICI through epigenetic reprogramming of the HUSH complex. We demonstrated that RE expression among 48 superfamilies inversely correlated with ZNF638 expression in gliomas, based on data from 71 newly-diagnosed GBMs. Using transcriptional deconvolution, we showed ZNF638 negatively correlates with innate antiviral immune response signatures(TLR3)(RTLR3=-0.300,pTLR3=0.00006). We validated these in-silico results in pure glioma cell lines, patient-derived GBM neurospheres, and syngeneic murine models. ZNF638 knockdown induced intracellular RE-mediated dsRNA signaling cascades via RIG-I and TLR3. This knockdown significantly increased PD-L1 expression(p&lt;0.001), reduced H3K9 trimethylation, and enhanced cytoplasmic dsRNA accumulation in glioma cell lines. In patient-derived GBM neurospheres, ZNF638 knockdown upregulated immune and antiviral programs. Additionally, knockdown resulted in upregulation of several endogenous repeat elements (Alu, LTR). Single-cell RNA sequencing showed ZNF638 clustering in neural progenitor-like and oligodendrocyte-like cells, with increased retroelement expression in low ZNF638 cells. Tumors with lower ZNF638 expression showed increased CD8+ populations. Bulk RNA sequencing deconvolution revealed that ZNF638 is linked to reduced CD8 and DC infiltration in gliomas (RCD8=-0.202,RDC=-0.198;pCD8=8.79E-06,pDC=1.34E-05). In immunocompetent mice, ZNF638 KO and PD-L1 inhibition significantly improved survival (mOS &gt;50 days, p&lt;0.0001) and reduced tumor volume (p&lt;0.001). Analysis of cohorts from multiple cancer types treated with anti-PD1 therapy demonstrated that ZNF638 expression predicts therapeutic response and overall survival. Our findings suggest that epigenetic reprogramming through HUSH inhibition may potentiate immunotherapy for GBM.</description><identifier>ISSN: 1522-8517</identifier><identifier>EISSN: 1523-5866</identifier><identifier>DOI: 10.1093/neuonc/noae165.0215</identifier><language>eng</language><publisher>US: Oxford University Press</publisher><ispartof>Neuro-oncology (Charlottesville, Va.), 2024-11, Vol.26 (Supplement_8), p.viii54-viii54</ispartof><rights>The Author(s) 2024. Published by Oxford University Press on behalf of the Society for Neuro-Oncology. All rights reserved. For commercial re-use, please contact reprints@oup.com for reprints and translation rights for reprints. All other permissions can be obtained through our RightsLink service via the Permissions link on the article page on our site—for further information please contact journals.permissions@oup.com. 2024</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,776,780,27901,27902</link.rule.ids></links><search><creatorcontrib>Chandar, Jay</creatorcontrib><creatorcontrib>Seetharam, Deepa</creatorcontrib><creatorcontrib>Desgraves, Jelisah</creatorcontrib><creatorcontrib>Ramsoomair, Christian</creatorcontrib><creatorcontrib>Castro, Jesus</creatorcontrib><creatorcontrib>Hudson, Anna</creatorcontrib><creatorcontrib>Govindarajan, Vaidya</creatorcontrib><creatorcontrib>Zhang, Yong</creatorcontrib><creatorcontrib>Sonabend, Adam</creatorcontrib><creatorcontrib>Valdez, Mynor Mendez</creatorcontrib><creatorcontrib>Maric, Dragan</creatorcontrib><creatorcontrib>Govindarajan, Vasundara</creatorcontrib><creatorcontrib>Rivas, Sarah</creatorcontrib><creatorcontrib>Lu, Victor</creatorcontrib><creatorcontrib>Alvarado, Alexandra</creatorcontrib><creatorcontrib>Tiwari, Ritika</creatorcontrib><creatorcontrib>Sharifi, Nima</creatorcontrib><creatorcontrib>DeMarino, Catherine</creatorcontrib><creatorcontrib>Johnson, Kory</creatorcontrib><creatorcontrib>De La Fuente, Macarena</creatorcontrib><creatorcontrib>Nasany, Ruham Alsiekh</creatorcontrib><creatorcontrib>Noviello, Teresa</creatorcontrib><creatorcontrib>Ivan, Michael</creatorcontrib><creatorcontrib>Komotar, Ricardo</creatorcontrib><creatorcontrib>Iavarone, Antonio</creatorcontrib><creatorcontrib>Nath, Avindra</creatorcontrib><creatorcontrib>Heiss, John</creatorcontrib><creatorcontrib>Ceccarelli, Michele</creatorcontrib><creatorcontrib>Chiappinelli, Katherine</creatorcontrib><creatorcontrib>Figueroa, Maria</creatorcontrib><creatorcontrib>Bayik, Defne</creatorcontrib><creatorcontrib>Shah, Ashish</creatorcontrib><title>CNSC-59. EPIGENETIC POTENTIATION OF ANTI-TUMOR IMMUNE RESPONSES USING VIRAL MIMICRY IN GLIOMAS</title><title>Neuro-oncology (Charlottesville, Va.)</title><description>Abstract Clinical trials using immune checkpoint inhibition(ICI) have traditionally failed in glioblastoma (GBM). Viral mimicry, which augments anti-tumor immune responses and sensitizes response to immunotherapy in other cancers, involves the epigenetic activation of endogenous retroelements (REs). REs are silenced via the HUSH complex and H3K9me3. This process is mediated by ZNF638. We aimed to elucidate the role of viral mimicry in enhancing ICI through epigenetic reprogramming of the HUSH complex. We demonstrated that RE expression among 48 superfamilies inversely correlated with ZNF638 expression in gliomas, based on data from 71 newly-diagnosed GBMs. Using transcriptional deconvolution, we showed ZNF638 negatively correlates with innate antiviral immune response signatures(TLR3)(RTLR3=-0.300,pTLR3=0.00006). We validated these in-silico results in pure glioma cell lines, patient-derived GBM neurospheres, and syngeneic murine models. ZNF638 knockdown induced intracellular RE-mediated dsRNA signaling cascades via RIG-I and TLR3. This knockdown significantly increased PD-L1 expression(p&lt;0.001), reduced H3K9 trimethylation, and enhanced cytoplasmic dsRNA accumulation in glioma cell lines. In patient-derived GBM neurospheres, ZNF638 knockdown upregulated immune and antiviral programs. Additionally, knockdown resulted in upregulation of several endogenous repeat elements (Alu, LTR). Single-cell RNA sequencing showed ZNF638 clustering in neural progenitor-like and oligodendrocyte-like cells, with increased retroelement expression in low ZNF638 cells. Tumors with lower ZNF638 expression showed increased CD8+ populations. Bulk RNA sequencing deconvolution revealed that ZNF638 is linked to reduced CD8 and DC infiltration in gliomas (RCD8=-0.202,RDC=-0.198;pCD8=8.79E-06,pDC=1.34E-05). In immunocompetent mice, ZNF638 KO and PD-L1 inhibition significantly improved survival (mOS &gt;50 days, p&lt;0.0001) and reduced tumor volume (p&lt;0.001). Analysis of cohorts from multiple cancer types treated with anti-PD1 therapy demonstrated that ZNF638 expression predicts therapeutic response and overall survival. Our findings suggest that epigenetic reprogramming through HUSH inhibition may potentiate immunotherapy for GBM.</description><issn>1522-8517</issn><issn>1523-5866</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2024</creationdate><recordtype>article</recordtype><recordid>eNqNkNFOgzAUhhujiXP6BN70BcootaVcEtJhE2gXKCbeSAprE43CAtmFb-_Y9gBenXP-nO8k5wPgGYcBDhOyGdxxHPrNMFqHGQ3CCNMbsMI0Iohyxm7PfYQ4xfE9eJjnr3BZYXgFPjJVZ4gmARQ7mQsljMzgThuhjEyN1ArqLUxPAzJNqSsoy7JRAlai3mlVixo2tVQ5fJNVWsBSljKr3qFUMC-kLtP6Edx5-z27p2tdA7MVJntFhc5llhao54QiHyd8T4i3PmI8cR3xccQ6ugSdc_vupbeOe08sjjl1iXPEMt-xxFIeYxt5sgbkcrafxnmenG8P0-ePnX5bHLaLofZiqL0aapf3T1Rwocbj4V_AH1C-Zaw</recordid><startdate>20241111</startdate><enddate>20241111</enddate><creator>Chandar, Jay</creator><creator>Seetharam, Deepa</creator><creator>Desgraves, Jelisah</creator><creator>Ramsoomair, Christian</creator><creator>Castro, Jesus</creator><creator>Hudson, Anna</creator><creator>Govindarajan, Vaidya</creator><creator>Zhang, Yong</creator><creator>Sonabend, Adam</creator><creator>Valdez, Mynor Mendez</creator><creator>Maric, Dragan</creator><creator>Govindarajan, Vasundara</creator><creator>Rivas, Sarah</creator><creator>Lu, Victor</creator><creator>Alvarado, Alexandra</creator><creator>Tiwari, Ritika</creator><creator>Sharifi, Nima</creator><creator>DeMarino, Catherine</creator><creator>Johnson, Kory</creator><creator>De La Fuente, Macarena</creator><creator>Nasany, Ruham Alsiekh</creator><creator>Noviello, Teresa</creator><creator>Ivan, Michael</creator><creator>Komotar, Ricardo</creator><creator>Iavarone, Antonio</creator><creator>Nath, Avindra</creator><creator>Heiss, John</creator><creator>Ceccarelli, Michele</creator><creator>Chiappinelli, Katherine</creator><creator>Figueroa, Maria</creator><creator>Bayik, Defne</creator><creator>Shah, Ashish</creator><general>Oxford University Press</general><scope>AAYXX</scope><scope>CITATION</scope></search><sort><creationdate>20241111</creationdate><title>CNSC-59. EPIGENETIC POTENTIATION OF ANTI-TUMOR IMMUNE RESPONSES USING VIRAL MIMICRY IN GLIOMAS</title><author>Chandar, Jay ; Seetharam, Deepa ; Desgraves, Jelisah ; Ramsoomair, Christian ; Castro, Jesus ; Hudson, Anna ; Govindarajan, Vaidya ; Zhang, Yong ; Sonabend, Adam ; Valdez, Mynor Mendez ; Maric, Dragan ; Govindarajan, Vasundara ; Rivas, Sarah ; Lu, Victor ; Alvarado, Alexandra ; Tiwari, Ritika ; Sharifi, Nima ; DeMarino, Catherine ; Johnson, Kory ; De La Fuente, Macarena ; Nasany, Ruham Alsiekh ; Noviello, Teresa ; Ivan, Michael ; Komotar, Ricardo ; Iavarone, Antonio ; Nath, Avindra ; Heiss, John ; Ceccarelli, Michele ; Chiappinelli, Katherine ; Figueroa, Maria ; Bayik, Defne ; Shah, Ashish</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c835-f798d33faf2689eb3f726b53fafbeedb4cae8ff3a1785e9ee3a6fb69a5871a2f3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2024</creationdate><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Chandar, Jay</creatorcontrib><creatorcontrib>Seetharam, Deepa</creatorcontrib><creatorcontrib>Desgraves, Jelisah</creatorcontrib><creatorcontrib>Ramsoomair, Christian</creatorcontrib><creatorcontrib>Castro, Jesus</creatorcontrib><creatorcontrib>Hudson, Anna</creatorcontrib><creatorcontrib>Govindarajan, Vaidya</creatorcontrib><creatorcontrib>Zhang, Yong</creatorcontrib><creatorcontrib>Sonabend, Adam</creatorcontrib><creatorcontrib>Valdez, Mynor Mendez</creatorcontrib><creatorcontrib>Maric, Dragan</creatorcontrib><creatorcontrib>Govindarajan, Vasundara</creatorcontrib><creatorcontrib>Rivas, Sarah</creatorcontrib><creatorcontrib>Lu, Victor</creatorcontrib><creatorcontrib>Alvarado, Alexandra</creatorcontrib><creatorcontrib>Tiwari, Ritika</creatorcontrib><creatorcontrib>Sharifi, Nima</creatorcontrib><creatorcontrib>DeMarino, Catherine</creatorcontrib><creatorcontrib>Johnson, Kory</creatorcontrib><creatorcontrib>De La Fuente, Macarena</creatorcontrib><creatorcontrib>Nasany, Ruham Alsiekh</creatorcontrib><creatorcontrib>Noviello, Teresa</creatorcontrib><creatorcontrib>Ivan, Michael</creatorcontrib><creatorcontrib>Komotar, Ricardo</creatorcontrib><creatorcontrib>Iavarone, Antonio</creatorcontrib><creatorcontrib>Nath, Avindra</creatorcontrib><creatorcontrib>Heiss, John</creatorcontrib><creatorcontrib>Ceccarelli, Michele</creatorcontrib><creatorcontrib>Chiappinelli, Katherine</creatorcontrib><creatorcontrib>Figueroa, Maria</creatorcontrib><creatorcontrib>Bayik, Defne</creatorcontrib><creatorcontrib>Shah, Ashish</creatorcontrib><collection>CrossRef</collection><jtitle>Neuro-oncology (Charlottesville, Va.)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Chandar, Jay</au><au>Seetharam, Deepa</au><au>Desgraves, Jelisah</au><au>Ramsoomair, Christian</au><au>Castro, Jesus</au><au>Hudson, Anna</au><au>Govindarajan, Vaidya</au><au>Zhang, Yong</au><au>Sonabend, Adam</au><au>Valdez, Mynor Mendez</au><au>Maric, Dragan</au><au>Govindarajan, Vasundara</au><au>Rivas, Sarah</au><au>Lu, Victor</au><au>Alvarado, Alexandra</au><au>Tiwari, Ritika</au><au>Sharifi, Nima</au><au>DeMarino, Catherine</au><au>Johnson, Kory</au><au>De La Fuente, Macarena</au><au>Nasany, Ruham Alsiekh</au><au>Noviello, Teresa</au><au>Ivan, Michael</au><au>Komotar, Ricardo</au><au>Iavarone, Antonio</au><au>Nath, Avindra</au><au>Heiss, John</au><au>Ceccarelli, Michele</au><au>Chiappinelli, Katherine</au><au>Figueroa, Maria</au><au>Bayik, Defne</au><au>Shah, Ashish</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>CNSC-59. EPIGENETIC POTENTIATION OF ANTI-TUMOR IMMUNE RESPONSES USING VIRAL MIMICRY IN GLIOMAS</atitle><jtitle>Neuro-oncology (Charlottesville, Va.)</jtitle><date>2024-11-11</date><risdate>2024</risdate><volume>26</volume><issue>Supplement_8</issue><spage>viii54</spage><epage>viii54</epage><pages>viii54-viii54</pages><issn>1522-8517</issn><eissn>1523-5866</eissn><abstract>Abstract Clinical trials using immune checkpoint inhibition(ICI) have traditionally failed in glioblastoma (GBM). Viral mimicry, which augments anti-tumor immune responses and sensitizes response to immunotherapy in other cancers, involves the epigenetic activation of endogenous retroelements (REs). REs are silenced via the HUSH complex and H3K9me3. This process is mediated by ZNF638. We aimed to elucidate the role of viral mimicry in enhancing ICI through epigenetic reprogramming of the HUSH complex. We demonstrated that RE expression among 48 superfamilies inversely correlated with ZNF638 expression in gliomas, based on data from 71 newly-diagnosed GBMs. Using transcriptional deconvolution, we showed ZNF638 negatively correlates with innate antiviral immune response signatures(TLR3)(RTLR3=-0.300,pTLR3=0.00006). We validated these in-silico results in pure glioma cell lines, patient-derived GBM neurospheres, and syngeneic murine models. ZNF638 knockdown induced intracellular RE-mediated dsRNA signaling cascades via RIG-I and TLR3. This knockdown significantly increased PD-L1 expression(p&lt;0.001), reduced H3K9 trimethylation, and enhanced cytoplasmic dsRNA accumulation in glioma cell lines. In patient-derived GBM neurospheres, ZNF638 knockdown upregulated immune and antiviral programs. Additionally, knockdown resulted in upregulation of several endogenous repeat elements (Alu, LTR). Single-cell RNA sequencing showed ZNF638 clustering in neural progenitor-like and oligodendrocyte-like cells, with increased retroelement expression in low ZNF638 cells. Tumors with lower ZNF638 expression showed increased CD8+ populations. Bulk RNA sequencing deconvolution revealed that ZNF638 is linked to reduced CD8 and DC infiltration in gliomas (RCD8=-0.202,RDC=-0.198;pCD8=8.79E-06,pDC=1.34E-05). In immunocompetent mice, ZNF638 KO and PD-L1 inhibition significantly improved survival (mOS &gt;50 days, p&lt;0.0001) and reduced tumor volume (p&lt;0.001). Analysis of cohorts from multiple cancer types treated with anti-PD1 therapy demonstrated that ZNF638 expression predicts therapeutic response and overall survival. Our findings suggest that epigenetic reprogramming through HUSH inhibition may potentiate immunotherapy for GBM.</abstract><cop>US</cop><pub>Oxford University Press</pub><doi>10.1093/neuonc/noae165.0215</doi></addata></record>
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