title: Znhit1 causes cell cycle arrest and down-regulates CDK6 expression.
abstract: Cyclin-dependent kinase 6 (CDK6) is the key element of the D-type cyclin holoenzymes which has been found to function in the regulation of G1-phase of the cell cycle and is presumed to play important roles in T cell function. In this study, Znhit1, a member of a new zinc finger protein family defined by a conserved Zf-HIT domain, induced arrest in the G1-phase of the cell cycle in NIH/3T3 cells. Of the G1 cell cycle factors examined, the expression of CDK6 was found to be strongly down-regulated by Znhit1 via transcriptional repression. This effect may have correlations with the decreased acetylation level of histone H4 in the CDK6 promoter region. In addition, considering that CDK6 expression predominates in T cells, the negative regulatory role of Znhit1 in TCR-induced T cell proliferation was validated using transgenic mice. These findings identified Znhit1 as a CDK6 regulator that plays an important role in cell proliferation.
authors.affiliation: Laboratory of Molecular Cell Biology, Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, 320 Yueyang Road, Shanghai 200031, China.
authors.forename: Zhengmin
authors.initials: Z
authors.lastname: Yang
authors.forename: Yonghao
authors.initials: Y
authors.lastname: Cao
authors.forename: Xiaoyan
authors.initials: X
authors.lastname: Zhu
authors.forename: Ying
authors.initials: Y
authors.lastname: Huang
authors.forename: Yuqiang
authors.initials: Y
authors.lastname: Ding
authors.forename: Xiaolong
authors.initials: X
authors.lastname: Liu
mesh_terms: D000818:Animals; D002352:Carrier Proteins / Q000235:genetics / Q000378:metabolism*; D002453:Cell Cycle / Q000235:genetics*; D049109:Cell Proliferation; D051361:Cyclin-Dependent Kinase 6 / Q000037:antagonists & inhibitors / Q000235:genetics*; D015536:Down-Regulation; D005347:Fibroblasts / Q000166:cytology / Q000378:metabolism; D015971:Gene Expression Regulation, Enzymologic; D051379:Mice; D008822:Mice, Transgenic; D041681:NIH 3T3 Cells; D011401:Promoter Regions, Genetic; D013601:T-Lymphocytes / Q000166:cytology / Q000378:metabolism
chemical_list: D002352:Carrier Proteins; C542324:Znhit1 protein, mouse; C495912:Cdk6 protein, mouse; D051361:Cyclin-Dependent Kinase 6