Abstract
Multiple cancers exhibit aberrant protein arginine methylation by both type I arginine methyltransferases, predominately protein arginine methyltransferase 1 (PRMT1) and to a lesser extent PRMT4, and by type II PRMTs, predominately PRMT5. Here, we perform targeted proteomics following inhibition of PRMT1, PRMT4, and PRMT5 across 12 cancer cell lines. We find that inhibition of type I and II PRMTs suppresses phosphorylated and total ATR in cancer cells. Loss of ATR from PRMT inhibition results in defective DNA replication stress response activation, including from PARP inhibitors. Inhibition of type I and II PRMTs is synergistic with PARP inhibition regardless of homologous recombination function, but type I PRMT inhibition is more toxic to non-malignant cells. Finally, we demonstrate that the combination of PARP and PRMT5 inhibition improves survival in both BRCA-mutant and wild-type patient-derived xenografts without toxicity. Taken together, these results demonstrate that PRMT5 inhibition may be a well-tolerated approach to sensitize tumors to PARP inhibition.
Original language | English (US) |
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Article number | 101326 |
Journal | Cell Reports Medicine |
Volume | 4 |
Issue number | 12 |
DOIs | |
State | Published - Dec 19 2023 |
Funding
N.S. is a CPRIT Scholar in Cancer Research with funding from the Cancer Prevention and Research Institute of Texas (CPRIT) New Investigator Grant RR160021, a recipient of the Early Career Award by Ovarian Cancer Research Alliance (grant 649968); the Blanton-Davis Ovarian Cancer Research Program; and the Andrew Sabin Family Foundation Fellowship. Funding support to D.J.M. was provided by Susan G. Komen grant PDF17483544. Additional funding was provided by Susan G. Komen Foundation grant CCR19609287 (S.S.Y.); NIH R35GM133658 (S.S.Y.); NCI CA16672 (RPPA Core Facilities/Y. Lu); NIH R50CA221675 (Y. Lu); NIH R35GM137836 (N.S.); CPRIT Core Facility Grant RP170628 (Flow Cytometry and Imaging Core Facilities/C.R.J.); NCI CA125123 (M.T.L. L.E.D. C.S.); CPRIT Core Facilities Support Grant RP170691 (M.T.L. L.E.D. C.S.); CPRIT RP200520 (W.P.); SPORE in Ovarian Cancer (CA216785); Ovarian Cancer Moon Shot (A.K.S.); the American Cancer Society (A.K.S.); the Frank McGraw Memorial Chair in Cancer Research (A.K.S.); and US Department of Defense Breast Cancer Research Program W81XWH2210018 (M.L.M.). Y. Li, L.E.D. C.S. T.D.K. D.B. Y.W. S.A. B.K. S.W. Y. Lu, C.R.J. and D.J.M. performed experiments and compiled experimental data. X.Z. and J.L. developed organoid models. W.P. M.L.M. G.P. S.N.W. A.K.S. M.T.L. J.D. S.S.Y. and M.T.B provided guidance on data interpretation, analysis, and project direction. M.T.B. D.J.M. and N.S. conceptualized the project. D.J.M. and N.S. wrote the manuscript with critical input from all authors. D.J.M. and N.S. supervised the project. M.T.L. is a founder and limited partner in StemMed, Ltd. and a manager in StemMed Holdings, its general partner. He is a founder and equity stakeholder in Tvardi Therapeutics, Inc. Some PDXs are exclusively licensed to StemMed, Ltd. resulting in royalty income to M.T.L. L.E.D. is a compensated employee of StemMed, Ltd. Some PDXs are exclusively licensed to StemMed, Ltd. resulting in royalty income to L.E.D. A.K.S. discloses the following competing interests: consulting (Merck, GSK, ImmunoGen, Iylon, Kiyatec, Astra Zeneca, Onxeo), shareholder (BioPath), and patent (EGFL6 antibody). N.S. is a CPRIT Scholar in Cancer Research with funding from the Cancer Prevention and Research Institute of Texas (CPRIT) New Investigator Grant RR160021 , a recipient of the Early Career Award by Ovarian Cancer Research Alliance (grant 649968 ); the Blanton-Davis Ovarian Cancer Research Program; and the Andrew Sabin Family Foundation Fellowship. Funding support to D.J.M. was provided by Susan G. Komen grant PDF17483544 . Additional funding was provided by Susan G. Komen Foundation grant CCR19609287 (S.S.Y.); NIH R35GM133658 (S.S.Y.); NCI CA16672 (RPPA Core Facilities/Y. Lu); NIH R50CA221675 (Y. Lu); NIH R35GM137836 (N.S.); CPRIT Core Facility Grant RP170628 (Flow Cytometry and Imaging Core Facilities/C.R.J.); NCI CA125123 (M.T.L., L.E.D., C.S.); CPRIT Core Facilities Support Grant RP170691 (M.T.L., L.E.D., C.S.); CPRIT RP200520 (W.P.); SPORE in Ovarian Cancer ( CA216785 ); Ovarian Cancer Moon Shot (A.K.S.); the American Cancer Society (A.K.S.); the Frank McGraw Memorial Chair in Cancer Research (A.K.S.); and US Department of Defense Breast Cancer Research Program W81XWH2210018 (M.L.M.).
Keywords
- DNA replication stress
- PARP inhibitors
- PRMT inhibitors
- arginine methylation
- breast cancer
- ovarian cancer
ASJC Scopus subject areas
- General Biochemistry, Genetics and Molecular Biology