Hepatocyte growth factor transforms immortalized mouse liver epithelial cells

Area of Science:

• Cell Biology
• Molecular Biology
• Oncology

Background:

• Hepatocyte growth factor (HGF) is a key regulator of cell growth, motility, and morphogenesis.
• The role of HGF in carcinogenesis, particularly through autocrine or paracrine mechanisms, requires further investigation.

Purpose of the Study:

• To investigate the transforming activity of HGF in immortalized mouse hepatocytes (MLE-10).
• To determine the in vitro and in vivo effects of exogenous HGF expression on MLE-10 cell behavior.

Main Methods:

• Transfection of MLE-10 cells with rat HGF cDNA using the cytomegalovirus promoter and neomycin resistance gene.
• Establishment of HGF-producing (MLE-10-HGF) and control (MLE-10-CMV) cell lines.
• Assessment of cell growth, soft agar colony formation, and tumor development in nude mice.

Main Results:

• MLE-10-HGF cell lines exhibited significantly enhanced proliferation and soft agar colony formation compared to control cells.
• High HGF-producing cell lines formed tumors in nude mice within two weeks.
• A direct correlation was observed between HGF expression levels and the extent of transformation (soft agar growth and tumor formation).

Conclusions:

• Exogenous HGF expression confers transforming activity on immortalized mouse hepatocytes.
• The HGF/HGFR/met system may play a significant role in carcinogenesis via autocrine and/or paracrine signaling pathways.
• These findings highlight the potential involvement of HGF in tumor development and progression.