Transrepressive function of TLX requires the histone demethylase LSD1.
TLX is an orphan nuclear receptor (also called NR2E1) that regulates the expression of target genes by functioning as a constitutive transrepressor. The physiological significance of TLX in the cytodifferentiation of neural cells in the brain is known. However, the corepressors supporting the transrepressive function of TLX have yet to be identified. In this report, Y79 retinoblastoma cells were subjected to biochemical techniques to purify proteins that interact with TLX, and we identified LSD1 (also called KDM1), which appears to form a complex with CoREST and histone deacetylase 1. LSD1 interacted with TLX directly through its SWIRM and amine oxidase domains. LSD1 potentiated the transrepressive function of TLX through its histone demethylase activity as determined by a luciferase assay using a genomically integrated reporter gene. LSD1 and TLX were recruited to a TLX-binding site in the PTEN gene promoter, accompanied by the demethylation of H3K4me2 and deacetylation of H3. Knockdown of either TLX or LSD1 derepressed expression of the endogenous PTEN gene and inhibited cell proliferation of Y79 cells. Thus, the present study suggests that LSD1 is a prime corepressor for TLX.
Yokoyama
Atsushi
A
Institute of Molecular and Cellular Biosciences, University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-0032, Japan.
Takezawa
Shinichiro
S
Schüle
Roland
R
Kitagawa
Hirochika
H
Kato
Shigeaki
S
D002460:Cell Line; D045744:Cell Line, Tumor; D049109:Cell Proliferation; D005786:Gene Expression Regulation; D017930:Genes, Reporter; D006655:Histone Deacetylases / Q000378:metabolism; D056466:Histone Demethylases; D006657:Histones / Q000378:metabolism; D006801:Humans; D008954:Models, Biological; D057093:Orphan Nuclear Receptors; D010089:Oxidoreductases, N-Demethylating / Q000378:metabolism / Q000502:physiology*; D011401:Promoter Regions, Genetic; D017434:Protein Structure, Tertiary; D018160:Receptors, Cytoplasmic and Nuclear / Q000378:metabolism*
D006657:Histones; C088601:NR2E1 protein, human; D057093:Orphan Nuclear Receptors; D018160:Receptors, Cytoplasmic and Nuclear; D056466:Histone Demethylases; C495195:KDM1A protein, human; D010089:Oxidoreductases, N-Demethylating; D006655:Histone Deacetylases