Malignant transformation of human fibroblasts previously immortalized with 60Co gamma rays.

Abstract:

:Normal human fibroblasts obtained from a whole embryo were malignantly transformed with only 60Co gamma rays, but after extensive passage. The fibroblasts were exposed intermittently to 60Co gamma rays, 13 times, 2,800 rads in total, from the primary culture to the 40th passage level. At the 50th passage level the cells became morphologically changed, showing chromosomal abnormalities, and serial passages showed them to be immortalized. They were not tumorigenic on transplantation into nude mice, but became malignant after extensive passage; i.e., at the 547th passage level and 2,800 days after initiation of the culture. Our results indicate that several different genotypic changes are necessary for malignant transformation of human cells over long periods. No mutation at codons 12 and 61 of H-, K- and N-ras was detected in the malignant cells. Thus, this system may be useful to detect other cellular genes that may contribute to the malignant phenotypes of human fibroblasts.

journal_name

Int J Cancer

authors

Mihara K,Bai L,Kano Y,Miyazaki M,Namba M

doi

10.1002/ijc.2910500426

keywords:

subject

Has Abstract

pub_date

1992-02-20 00:00:00

pages

639-43

issue

4

eissn

0020-7136

issn

1097-0215

journal_volume

50

pub_type

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