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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Jpn+J+Cancer+Res
1996 ; 87
(4
): 377-84
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gab.com Text
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English Wikipedia
Inhibition of cell growth by transforming growth factor beta 1 is associated with
p53-independent induction of p21 in gastric carcinoma cells
#MMPMID8641969
Akagi M
; Yasui W
; Akama Y
; Yokozaki H
; Tahara H
; Haruma K
; Kajiyama G
; Tahara E
Jpn J Cancer Res
1996[Apr]; 87
(4
): 377-84
PMID8641969
show ga
Cell cycle regulators such as cyclins, cyclin-dependent kinases (cdks) and their
inhibitors control the growth of cells. SDI1/CIP1/WAF1/p21 is a potent inhibitor
of G1 cdks, whose expression is induced by wild-type p53. To elucidate the
mechanism of growth inhibition by transforming growth factor beta 1 (TGFbeta 1),
we examined the effect of TGFbeta 1 on the expression of p21, G1 cyclins and cdks
by human gastric cancer cell lines. TGFbeta 1 induced p21 expression and
subsequently suppressed cdk2 kinase activity, followed by a reduction in
phosphorylation of the product of the retinoblastoma tumor suppressor gene in
TMK-1 cells, which are responsive to TGFbeta 1. Coimmunoprecipitation analysis
demonstrated that TGFbeta 1 increased the level of p21 protein present in
complexes with cdk2. In contrast, TGFbeta 1 did not induce p21 in TGFbeta
1-resistant MKN-28 cells. TGFbeta 1 did not affect the levels of p53 mRNA and
protein in TMK-1 and MKN-28 cells, which contain mutated p53 genes. These mutated
p53 complementary DNAs, when overexpressed, failed to activate transcription from
the p21 promoter. Furthermore, TGFbeta 1 caused a reduction in the steady-state
level of cyclin A protein concomitantly with inhibition of cdk2 kinase activity
in TMK-1 cells. These results suggest that the growth inhibition of tumor cells
by TGFbeta 1 is associated with p53-independent induction of p21, subsequent
suppression of cdk activity and a decrease in cyclin A protein in TMK-1 cells.