Fbxw8 is involved in the proliferation of human choriocarcinoma JEG-3 cells.
Fbxw8 is the F-box component of a SCF-like E3 ubiquitin ligase complex. Mice lacking Fbxw8 exhibit pathological defects in placenta and embryo similar to fetal growth retardation, suggesting a role of Fbxw8 in placentation. Proliferative capacity of trophoblast cells is very important in placental development. In this context, we revealed that Fbxw8 was expressed in four different human trophoblast cell lines. Silencing of Fbxw8 expression by siRNA inhibited the growth of choriocarcinoma JEG-3 cells. By Western blotting, cell cycle analysis, we showed that down-regulation of Fbxw8 by RNAi induced cell-growth arrest at G2/M phase through decreasing the levels of CDK1, CDK2, cyclin A and cyclin B1 and up-regulation of p27 at protein level. Conversely, over-expression of Fbxw8 led to the opposite effect. These results suggest that Fbxw8 plays an essential role in the proliferation of human trophoblast cells, especially JEG-3 cells, via G2/M phase transition in association with regulation of CDK1, CDK2, cyclin A, cyclin B1 and p27 expression.
Lin
Ping
P
Department of Biochemistry and Molecular Biology, College of Basic Medical Science, Harbin Medical University, Harbin 150081, China.
Fu
Jiejun
J
Zhao
Binjiahui
B
Lin
Feng
F
Zou
Haifeng
H
Liu
Leiyu
L
Zhu
Cheng
C
Wang
Hongmei
H
Yu
Xiaoguang
X
D002453:Cell Cycle / Q000235:genetics; D018797:Cell Cycle Proteins / Q000378:metabolism; D045744:Cell Line, Tumor; D049109:Cell Proliferation; D002822:Choriocarcinoma / Q000235:genetics / Q000473:pathology*; D015536:Down-Regulation / Q000235:genetics; D044783:F-Box Proteins / Q000235:genetics / Q000378:metabolism*; D015972:Gene Expression Regulation, Neoplastic; D006801:Humans; D014162:Transfection; D014327:Trophoblasts / Q000378:metabolism; D015854:Up-Regulation / Q000235:genetics
D018797:Cell Cycle Proteins; D044783:F-Box Proteins; C526069:FBXW8 protein, human