title: Senescence delay and repression of p16INK4a by Lsh via recruitment of histone deacetylases in human diploid fibroblasts.
abstract: Lymphoid specific helicase (Lsh) belongs to the family of SNF2/helicases. Disruption of Lsh leads to developmental growth retardation and premature aging in mice. However, the specific effect of Lsh on human cellular senescence remains unknown. Herein, we report that Lsh overexpression delays cell senescence by silencing p16(INK4a) in human fibroblasts. The patterns of p16(INK4a) and Lsh expression during cell senescence present the inverse correlation. We also find that Lsh requires histone deacetylase (HDAC) activity to repress p16(INK4a) and treatment with trichostatin A (TSA) is sufficient to block the repressor effect of Lsh. Moreover, overexpression of Lsh is correlated with deacetylation of histone H3 at the p16 promoter, and TSA treatment in Lsh-expressing cells reverses the acetylation status of histones. Additionally, we demonstrate an interaction between Lsh, histone deacetylase 1 (HDAC1) and HDAC2 in vivo. Furthermore, we demonstrate that Lsh interacts in vivo with the p16 promoter and recruits HDAC1. Our data suggest that Lsh represses endogenous p16(INK4a) expression by recruiting HDAC to establish a repressive chromatin structure at the p16(INK4a) promoter, which in turn delays cell senescence.
authors: Department of Biochemistry and Molecular Biology, Peking University Health Science Center, Research Center on Aging, Beijing 100191, People's Republic of China.
authors: Rui
authors: R
authors: Zhou
authors: Limin
authors: L
authors: Han
authors: Guodong
authors: G
authors: Li
authors: Tanjun
authors: T
authors: Tong
mesh_terms: D002460:Cell Line; D049109:Cell Proliferation; D016922:Cellular Senescence / Q000235:genetics*; D019941:Cyclin-Dependent Kinase Inhibitor p16 / Q000235:genetics* / Q000378:metabolism; D004248:DNA (Cytosine-5-)-Methyltransferases / Q000378:metabolism; D004265:DNA Helicases / Q000037:antagonists & inhibitors / Q000235:genetics / Q000378:metabolism*; D004171:Diploidy; D005347:Fibroblasts / Q000166:cytology / Q000201:enzymology / Q000378:metabolism; D016193:G1 Phase; D020868:Gene Silencing; D006570:Heterochromatin / Q000737:chemistry; D056284:Histone Deacetylase 1; D056464:Histone Deacetylase 2; D006655:Histone Deacetylases / Q000378:metabolism*; D006801:Humans; D011401:Promoter Regions, Genetic; D012097:Repressor Proteins / Q000378:metabolism; D001616:beta-Galactosidase / Q000378:metabolism
chemical_list: D019941:Cyclin-Dependent Kinase Inhibitor p16; D006570:Heterochromatin; D012097:Repressor Proteins; D004248:DNA (Cytosine-5-)-Methyltransferases; D001616:beta-Galactosidase; C110550:HDAC1 protein, human; C533424:Hdac2 protein, mouse; D056284:Histone Deacetylase 1; D056464:Histone Deacetylase 2; D006655:Histone Deacetylases; D004265:DNA Helicases; C412063:HELLS protein, human