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. 1997 Sep;88(9):855–860. doi: 10.1111/j.1349-7006.1997.tb00461.x

Expressions of Cell Cycle Regulators in Human Colorectal Cancer Cell Lines

Osamu Tominaga 1, Marcelo Eidi Nita 1, Hirokazu Nagawa 1, Shin Fujii 1, Takashi Tsuruo 2, Tetsuichiro Muto 1
PMCID: PMC5921521  PMID: 9369933

Abstract

To study the altered mechanisms of cell cycle regulation in colorectal cancer, the expressions of cyclins, cyclin‐dependent kinases (CDKs), CDK inhibitors, p53 and retinoblastoma (Rb) protein were analyzed by western blotting in a series of human colorectal cancer cell lines. The colorectal cancer cell lines exhibited various expression patterns of cell cycle regulators, which may reflect differences in the biological characteristics of cancer cells and in the genetic backgrounds of carcinogenesis. A correlation was found between p53 gene alteration and p21 expression, suggesting that p53 gene mutation usually suppresses p21 expression, though p21 expression could be induced via both ap53‐dependent and a p53 ‐independent pathway in colorectal cancer. None of the cell lines studied expressed p16 protein, suggesting that inactivation of p16 may be a common alteration in colorectal cancer. Moreover, all the D‐type cyclins, especially D2 and D3, were expressed at a high level in most of the cell lines. Loss of p16 expression and increased expression of D‐type cyclins promote CDK‐mediated Rb phosphorylation. All of the colorectal cancer cell lines studied herein expressed Rb protein, but the growth‐suppressive properties of Rb may be inactivated by the loss of p16 expression and increased expressions of D‐type cyclins. In view of the pivotal role of Rb in cell cycle regulation, loss of p16 expression and overexpression of D‐type cyclins may be critical alterations in colorectal cancer.

Keywords: Cell cycle, Colorectal cancer, Cyclin, Cyclin‐dependent kinase, Cyclin‐dependent kinase inhibitor

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