[Functional study on TGF-beta/Smads signaling pathway in human ovarian cancer cells].
Resistance to the growth inhibitory effects of transforming growth factor-beta (TGF-beta) is a characteristic of many transformed cells. The purpose of this study was to determine the response of ovarian cancer cells to TGF-beta1 and to investigate the roles of components of the TGF-beta/Smads signaling pathway in carcinogenesis of ovarian cancer. Three ovarian cancer cell lines, HO-8910, HO-8910PM and SKOV3, were treated with TGF-beta1 and assayed for growth response by MTT assay. Furthermore, expression and subcellular localization of the components of TGF-beta/Smads signaling pathway in these cell lines in the absence or presence of TGF-beta1 were determined by RT-PCR and immunofluorescence analysis. We found that proliferation of SKOV3 cell was not significantly inhibited by TGF-beta1 while it expressed all components of the TGF-beta/Smads signaling pathway. After exposure to TGF-beta1, Smad7 protein in SKOV3 increased transiently and translocated to cytoplasm from nucleus while P-Smad2 translocated into nucleus from cytoplasm. Taken together, the results suggested that the TGF-beta/Smads signaling pathway remained functional in human ovarian cancer cells, HO-8910, HO-8910PM and SKOV3, and the abnormalities of the downstream effectors of Smads proteins might contribute to the resistance of SKOV3 cell to TGF-beta1.
Zhang
Yun-Yan
YY
Laboratory of Medical Genetics, Harbin Medical University, Harbin 150086, China.
Li
Xue
X
Sui
Li-Hua
LH
Wang
Qi
Q
Li
Pu
P
Fu
Song-Bin
SB
D045744:Cell Line, Tumor; D004268:DNA-Binding Proteins / Q000235:genetics / Q000502:physiology*; D005260:Female; D006801:Humans; D010051:Ovarian Neoplasms / Q000378:metabolism* / Q000473:pathology; D015398:Signal Transduction / Q000502:physiology*; D051899:Smad2 Protein; D051906:Smad7 Protein; D015534:Trans-Activators / Q000235:genetics / Q000502:physiology*; D016212:Transforming Growth Factor beta / Q000494:pharmacology*; D053773:Transforming Growth Factor beta1
D004268:DNA-Binding Proteins; C497782:SMAD2 protein, human; C497806:SMAD7 protein, human; D051899:Smad2 Protein; D051906:Smad7 Protein; C508960:TGFB1 protein, human; D015534:Trans-Activators; D016212:Transforming Growth Factor beta; D053773:Transforming Growth Factor beta1