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. 1985 Apr;5(4):780–786. doi: 10.1128/mcb.5.4.780

Expression of c-Ki-ras, c-Ha-ras, and c-myc in specific cell types during hepatocarcinogenesis.

P Yaswen, M Goyette, P R Shank, N Fausto
PMCID: PMC366782  PMID: 2581126

Abstract

We examined the expression of six proto-oncogenes in (i) whole rat liver and isolated liver cell populations during the course of hepatocarcinogenesis induced by a choline-deficient diet containing 0.1% ethionine and (ii) fetal rat liver at different stages of development. The abundance of c-Ki-ras, c-Ha-ras, and c-myc transcripts in polysomal polyadenylated RNA from liver cells increased by 2 weeks after the start of the carcinogenic diet. c-Ki-ras and c-myc expression remained elevated during the 35 weeks of the diet, whereas c-Ha-ras transcripts increased transiently. A primary tumor sampled at 35 weeks after the carcinogenic diet was started contained high levels of both c-Ki-ras and c-myc RNA. The abundance of c-src transcripts was unchanged throughout carcinogenesis; c-abl and c-mos transcripts were not detected in either preneoplastic or neoplastic livers. To determine which cell types within the liver contained proto-oncogene transcripts, we isolated hepatocytes, oval cells, and bile duct cells from normal and preneoplastic livers. The results indicate that proto-oncogenes are expressed differentially in these cell types during hepatocarcinogenesis and that the expression of c-Ki-ras and c-myc is high in oval cells throughout carcinogenesis. In developing livers, c-Ki-ras, c-Ha-ras, and c-myc transcript levels were high at 17 days of gestation but reached the low values characteristic of adult rat livers between 20 days of gestation and 3 days after birth.

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Selected References

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