Role of Coactivator Associated Arginine Methyltransferase 1 (CARM1) in the Regulation of the Biological Function of 1,25-Dihydroxyvitamin D

Overview

Journal Cells

Publisher MDPI

Specialties Biochemistry
Biophysics
Cell Biology
Molecular Biology

Date 2023 Jul 6

PMID 37408241

Authors

Leila J Mady

Yan Zhong

Puneet Dhawan

Sylvia Christakos

Affiliations

Soon will be listed here.

Abstract

1,25-Dihydroxyvitamin D3 (1,25(OH)D), the hormonally active form of vitamin D, activates the nuclear vitamin D receptor (VDR) to mediate the transcription of target genes involved in calcium homeostasis as well as in non-classical 1,25(OH)D actions. In this study, CARM1, an arginine methyltransferase, was found to mediate coactivator synergy in the presence of GRIP1 (a primary coactivator) and to cooperate with G9a, a lysine methyltransferase, in 1,25(OH)D induced transcription of (the gene involved in the metabolic inactivation of 1,25(OH)D). In mouse proximal renal tubule (MPCT) cells and in mouse kidney, chromatin immunoprecipitation analysis demonstrated that dimethylation of histone H3 at arginine 17, which is mediated by CARM1, occurs at vitamin D response elements in a 1,25(OH)D dependent manner. Treatment with TBBD, an inhibitor of CARM1, repressed 1,25(OH)D induced expression in MPCT cells, further suggesting that CARM1 is a significant coactivator of 1,25(OH)D induction of renal expression. CARM1 was found to act as a repressor of second messenger-mediated induction of the transcription of CYP27B1 (involved in the synthesis of 1,25(OH)D), supporting the role of CARM1 as a dual function coregulator. Our findings indicate a key role for CARM1 in the regulation of the biological function of 1,25(OH)D.

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