Expression of transforming growth factor alpha/epidermal growth factor receptor, hepatocyte growth factor/c-met and acidic fibroblast growth factor/fibroblast growth factor receptors during hepatocarcinogenesis.

Abstract:

:It is widely believed that abnormal production of polypeptide growth factors, together with other molecular alterations, play an important role in neoplastic development. Transforming growth factor alpha (TGFalpha), hepatocyte growth factor (HGF) and acidic fibroblast growth factor (aFGF) are the three major growth factors that contribute to liver regeneration occurring via both hepatocyte replication and oval cell proliferation. It is not clear, however, whether and to what extent these growth factors are also involved in hepatocarcinogenesis. In the present study, the gene expression of TGFalpha, HGF and aFGF and their corresponding receptors was examined by Northern blotting and in situ hybridization during hepatocarcinogenesis induced by the Solt-Farber protocol. All three growth factor/receptor systems, TGFalpha/epidermal growth factor receptor (EGFR), HGF/c-met and aFGF/FGF receptors (flg and bek) were significantly elevated at early time points when oval cells were proliferating. Their respective expression decreased after 1 month and remained at a low level until the development of liver tumors. In all hepatocellular carcinomas (HCC) examined, the transcripts of TGFalpha and aFGF were highly expressed, while those of HGF were low. With regard to the receptor expression in the tumors, EGFR was present at varying levels, c-met was expressed at higher levels and flg increased significantly, whereas bek remained at low levels. These data suggest that TGFalpha and aFGF are the major growth factors involved in the progression of HCC, and that the signal of aFGF is mainly transduced by the receptor flg in HCC. Furthermore, HCC cells were phenotypically very similar to oval cells with regard to the gene expression of growth factor/receptor systems. These results, along with the finding that all the HCC cells are positive for the oval cell antigen OV6, and that cytokeratin 19 is heavily expressed in both tumor and oval cells, strongly suggest that at least some of the HCC induced by the Solt-Farber protocol may be derived from oval cells.

journal_name

Carcinogenesis

journal_title

Carcinogenesis

authors

Hu Z,Evarts RP,Fujio K,Omori N,Omori M,Marsden ER,Thorgeirsson SS

doi

10.1093/carcin/17.5.931

subject

Has Abstract

pub_date

1996-05-01 00:00:00

pages

931-8

issue

5

eissn

0143-3334

issn

1460-2180

journal_volume

17

pub_type

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