Transformation of immortalized woodchuck hepatic cell lines with the c-Ha-ras proto-oncogene.

Abstract:

:Woodchuck hepatocytes were immortalized with the simian virus 40 T antigen (SV40 T-ag) oncogene and utilized in an oncogenic transformation assay. Transfection of these cell lines with an activated C-Ha-ras oncogene (EJ6.6) resulted in the transformation of cells to a phenotype characterized by anchorage-independent growth in soft agar. Colonies of transformed cells were subcloned and up to 80% were positive for oncoprotein expression detected by immunoblot and Northern blot procedures. When compared with the parental cell lines, ras-transformed derivatives were altered both morphologically and in growth rate. The tumorigenic potential of c-Ha-ras transformed cells was demonstrated in severe combined immunodeficient (SCID) mice. There was a latency period of 1 to 4 weeks before tumors were detectable and a period of 7 weeks was required for tumors to reach a diameter of 1 cm. Histologically, tumors derived from cell lines fully transformed by the SV40 T-ag had the appearance of well-differentiated hepatocellular carcinoma (HCC) while tumors derived from c-Ha-ras transformed cell lines had the appearance of poorly differentiated HCC. The capacity to induce oncogenic transformation events in immortalized woodchuck hepatic cell lines should provide the opportunity to study the cooperative effects of hepadnaviral genes in hepatocarcinogenesis in vitro.

journal_name

Carcinogenesis

journal_title

Carcinogenesis

authors

Jacob JR,Tennant BC

doi

10.1093/carcin/17.4.631

subject

Has Abstract

pub_date

1996-04-01 00:00:00

pages

631-6

issue

4

eissn

0143-3334

issn

1460-2180

journal_volume

17

pub_type

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