The expression of oncogenes in human developing liver and hepatomas

Area of Science:

• Oncology
• Molecular Biology
• Hepatology

Background:

• Oncogenes play critical roles in cell growth and differentiation.
• Aberrant oncogene expression is implicated in various cancers, including hepatocellular carcinoma.
• Understanding oncogene expression during development and in disease is crucial for targeted therapies.

Purpose of the Study:

• To investigate the expression patterns of various oncogenes in human fetal liver and hepatoma.
• To compare oncogene expression in normal adult liver, fetal liver, cirrhotic liver, and hepatoma.
• To explore the relationship between Erb B oncogene expression and its gene structure alterations in liver disease.

Main Methods:

• Analysis of oncogene mRNA levels using techniques like Northern blotting or RT-PCR.
• Comparison of gene expression profiles across different human liver tissues: fetal, adult normal, cirrhotic, and hepatoma.
• Detailed examination of Erb B gene structure in relation to its expression levels.

Main Results:

• Elevated expression of Erb (B), erb (A+B), Ha-ras, myc, fos, and fms oncogenes was observed in specific fetal liver development stages and in hepatoma compared to normal adult liver.
• Oncogenes such as rel, src, mos, sis, myb, Ki-ras, and bas showed no significant changes in mRNA levels during fetal liver development or in hepatoma.
• A strong correlation was found between Erb B oncogene expression and alterations in its gene structure within human cirrhotic liver and hepatoma tissues.

Conclusions:

• Specific oncogenes are differentially expressed during human fetal liver development and are upregulated in hepatoma.
• The expression of certain oncogenes remains stable during liver development and in hepatoma.
• Alterations in Erb B gene structure are associated with its elevated expression in cirrhotic liver and hepatoma, suggesting a role in hepatocarcinogenesis.