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Pasion J, Barisic D, Meydan C, Ng KY, Lafoz MT, Huse M, Melnick A, Wendel HG. Abstract 3731: Epigenetic control of tumor cell killing by natural killer cells. Cancer Res 2022. [DOI: 10.1158/1538-7445.am2022-3731] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Immunotherapies including the activation of endogenous immune cells have stimulated great interest for their anti-tumor functions. An initial focus has been on genetic lesions such as loss of MHC class I and class II molecules that facilitate tumor cell escape. More recently, epigenetic mechanisms such as the disruption of the SWI/SNF remodeling complex PBAF have been implicated in regulating tumor sensitivity to CD8 T cell-mediated killing. Here, I used an unbiased genetic screening approach to examine resistance and sensitivity of breast cancer cells to Natural Killer (NK) cells. Among expected hits including caspases, interferon receptors, and cell death executioners, the screen revealed a surprising role of alternate SWI/SNF complexes in controlling NK cell-mediated cytotoxicity that relate to interferon-γ and perforin/granzyme B, and may be pharmacologically reversible. Altogether, I will discuss a new epigenetic mechanism that affect NK cell-mediated cytotoxicity with a focus on SWI/SNF complexes.
Citation Format: Joyce Pasion, Darko Barisic, Cem Meydan, Kong Y. Ng, Maria Tello Lafoz, Morgan Huse, Ari Melnick, Hans-Guido Wendel. Epigenetic control of tumor cell killing by natural killer cells [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2022; 2022 Apr 8-13. Philadelphia (PA): AACR; Cancer Res 2022;82(12_Suppl):Abstract nr 3731.
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Mohan P, Pasion J, Ciriello G, Lailler N, de Stanchina E, Viale A, van den Berg A, Diepstra A, Wendel HG, Sanghvi VR, Singh K. Frequent 4EBP1 Amplification Induces Synthetic Dependence on FGFR Signaling in Cancer. Cancers (Basel) 2022; 14:2397. [PMID: 35626002 PMCID: PMC9139685 DOI: 10.3390/cancers14102397] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2022] [Revised: 05/06/2022] [Accepted: 05/11/2022] [Indexed: 02/04/2023] Open
Abstract
The eIF4E translation initiation factor has oncogenic properties and concordantly, the inhibitory eIF4E-binding protein (4EBP1) is considered a tumor suppressor. The exact molecular effects of 4EBP1 activation in cancer are still unknown. Surprisingly, 4EBP1 is a target of genomic copy number gains (Chr. 8p11) in breast and lung cancer. We noticed that 4EBP1 gains are genetically linked to gains in neighboring genes, including WHSC1L1 and FGFR1. Our results show that FGFR1 gains act to attenuate the function of 4EBP1 via PI3K-mediated phosphorylation at Thr37/46, Ser65, and Thr70 sites. This implies that not 4EBP1 but instead FGFR1 is the genetic target of Chr. 8p11 gains in breast and lung cancer. Accordingly, these tumors show increased sensitivity to FGFR1 and PI3K inhibition, and this is a therapeutic vulnerability through restoring the tumor-suppressive function of 4EBP1. Ribosome profiling reveals genes involved in insulin signaling, glucose metabolism, and the inositol pathway to be the relevant translational targets of 4EBP1. These mRNAs are among the top 200 translation targets and are highly enriched for structure and sequence motifs in their 5'UTR, which depends on the 4EBP1-EIF4E activity. In summary, we identified the translational targets of 4EBP1-EIF4E that facilitate the tumor suppressor function of 4EBP1 in cancer.
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Affiliation(s)
- Prathibha Mohan
- Cancer Biology and Genetics Program, Memorial Sloan Kettering Cancer Center, New York, NY 10065, USA; (P.M.); (J.P.); (H.-G.W.)
| | - Joyce Pasion
- Cancer Biology and Genetics Program, Memorial Sloan Kettering Cancer Center, New York, NY 10065, USA; (P.M.); (J.P.); (H.-G.W.)
| | - Giovanni Ciriello
- Department of Computational Biology, University of Lausanne, CH-1005 Lausanne, Switzerland;
| | - Nathalie Lailler
- Integrated Genomics Operation, Marie-Josée and Henry R. Kravis Center for Molecular Oncology, Memorial Sloan Kettering Cancer Center, New York, NY 10065, USA; (N.L.); (A.V.)
| | - Elisa de Stanchina
- Molecular Pharmacology Program, Memorial Sloan-Kettering Cancer Center, New York, NY 10065, USA;
| | - Agnes Viale
- Integrated Genomics Operation, Marie-Josée and Henry R. Kravis Center for Molecular Oncology, Memorial Sloan Kettering Cancer Center, New York, NY 10065, USA; (N.L.); (A.V.)
| | - Anke van den Berg
- Department of Pathology and Medical Biology, University of Groningen, University Medical Center Groningen, 9713 GZ Groningen, The Netherlands; (A.v.d.B.); (A.D.)
| | - Arjan Diepstra
- Department of Pathology and Medical Biology, University of Groningen, University Medical Center Groningen, 9713 GZ Groningen, The Netherlands; (A.v.d.B.); (A.D.)
| | - Hans-Guido Wendel
- Cancer Biology and Genetics Program, Memorial Sloan Kettering Cancer Center, New York, NY 10065, USA; (P.M.); (J.P.); (H.-G.W.)
| | - Viraj R. Sanghvi
- Department of Molecular and Cellular Pharmacology, Sylvester Comprehensive Cancer Center, Miller School of Medicine, University of Miami, Miami, FL 33136, USA;
| | - Kamini Singh
- Department of Molecular Pharmacology, Albert Einstein College of Medicine, Albert Einstein Cancer Center, Bronx, NY 10461, USA
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