Protein arginine methyltransferase 5 (PRMT5) promotes survival of lymphoma cells via activation of WNT/β-catenin and AKT/GSK3β proliferative signaling.

Abstract

Epigenetic regulation by the type II protein arginine methyltransferase, PRMT5, plays an essential role in the control of cancer cell proliferation and tumorigenesis. In this report, we investigate the relationship between PRMT5 and WNT/β-CATENIN as well as AKT/GSK3β proliferative signaling in three different types of non-Hodgkin's lymphoma cell lines, clinical samples, and mouse primary lymphoma cells. We show that PRMT5 stimulates WNT/β-CATENIN signaling through direct epigenetic silencing of pathway antagonists, AXIN2 and WIF1, and indirect activation of AKT/GSK3β signaling. PRMT5 inhibition with either shRNA-mediated knockdown or a specific small molecule PRMT5 inhibitor, CMP-5, not only leads to derepression of WNT antagonists and decreased levels of active phospho-AKT (Thr-450 and Ser-473) and inactive phospho-GSK3β (Ser-9) but also results in decreased transcription of WNT/β-CATENIN target genes, CYCLIN D1, c-MYC, and SURVIVIN, and enhanced lymphoma cell death. Furthermore, PRMT5 inhibition leads to reduced recruitment of co-activators CBP, p300, and MLL1, as well as enhanced recruitment of co-repressors HDAC2 and LSD1 to the WNT/β-CATENIN target gene promoters. These results indicate that PRMT5 governs expression of prosurvival genes by promoting WNT/β-CATENIN and AKT/GSK3β proliferative signaling and that its inhibition induces lymphoma cell death, which warrants further clinical evaluation.

• Authors: Jihyun Chung, Vrajesh Karkhanis, Robert A Baiocchi, Saïd Sif
• Journal: The Journal of biological chemistry (J Biol Chem) Vol. 294 Issue 19 Pg. 7692-7710 (05 10 2019) ISSN: 1083-351X [Electronic] United States
• PMID: 30885941 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
• Copyright: © 2019 Chung et al.

Chemical References

• beta Catenin
• Prmt5 protein, mouse
• Protein-Arginine N-Methyltransferases
• Glycogen Synthase Kinase 3 beta
• Gsk3b protein, mouse
• Proto-Oncogene Proteins c-akt

Topics

• Animals
• Cell Line, Tumor
• Cell Survival
• Gene Expression Regulation, Neoplastic
• Glycogen Synthase Kinase 3 beta (genetics, metabolism)
• Lymphoma (genetics, metabolism, pathology)
• Mice
• Protein-Arginine N-Methyltransferases (genetics, metabolism)
• Proto-Oncogene Proteins c-akt (genetics, metabolism)
• Signal Transduction
• Wnt Signaling Pathway
• beta Catenin (genetics, metabolism)