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ATP inhibition of proliferation of immortalized human fibroblasts is greater than that of normal human diploid fibroblasts.

Abstract：

:It is known that cancers develop by a multi-step process. Normal cells are first immortalized, and then transformed into tumorigenic cells. Normal human cells are very rarely immortalized, but once they are, they are relatively easily transformed into tumorigenic cells. This indicates that the immortalization step plays a critical part in the development of human cancers. Thus, elucidation of the mechanisms of this step would shed light on the process of carcinogenesis in human cells. To understand the causes of immortalization, it is important to determine the differences in cellular phenotype between immortalized and normal human cells. In this study, we found that immortalized human fibroblasts were more sensitive to the growth inhibitory effects of ATP than normal human fibroblasts. ADP was as effective as ATP, but AMP, adenosine, and phosphoric acid were not. These results indicate that a high-energy bound of ATP and ADP may contribute to the growth inhibition of the cells. When the immortalized cells were pulse-labeled with [32P]-ATP, 30-, 31-, 33- and 40-kDa membrane fraction proteins were more prominently labeled in the immortalized cells than in the normal cells. At present, the characteristics of these proteins are being investigated.

journal_name

Int J Mol Med

journal_title

International journal of molecular medicine

authors

Katayama B,Sakaguchi M,Li JW,Pu H,Inoue Y,Namba M

doi

10.3892/ijmm.2.5.603

subject

Has Abstract

pub_date

1998-11-01 00:00:00

pages

603-6

issue

5

eissn

1107-3756

issn

1791-244X

journal_volume

2

pub_type

杂志文章

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