Abstract
We have studied the expressions of nine proto-oncogenes (c-myc, N-myc, c-fos, C-jun, p53, H-ras, N-ras, c-raf, hst) and two other genes (PCNA, GST-P) during the spontaneous development of hepatocellular carcinomas (HCCs) in LEC rats. Expression of c-myc, H-ras, N-ras, C-raf, p53 and PCNA genes was detected, but this did not significantly change during the development of HCCs in LEC rats. Expression of N-myc and hst genes was not detectable. Expression of c-fos gene was detected in one HCC case out of four. Significantly increased expression of c-jun gene was observed in the liver tissues of LEC rats aged 8 months. This high expression was decreased with the development of HCCs. On the other hand, the expression of GST-P gene increased in parallel with the clinical course of the development of HCCs in LEC rats. The pattern of c-jun mRNA augmentation was different from that of GST-P mRNA. These observations suggest that c-jun gene may play a role in the spontaneous development of HCCs in LEC rats.
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