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[Proto-oncogene C-erbB-2 and human cancer]
1Dept. of Oncology, University of Tokyo.
Gan to Kagaku Ryoho. Cancer & Chemotherapy
|March 1, 1990
Summary
The C-erbB-2 (also known as HER-2) gene, a protein-tyrosine kinase, can transform cells through mutation, deletion, or amplification. Its overexpression in tumors indicates a high risk of metastasis and malignancy.
Area of Science:
- Molecular Biology
- Oncology
- Genetics
Background:
- The C-erbB-2 gene, homologous to V-erbB, encodes a receptor-type protein-tyrosine kinase.
- It shares structural similarity with the epidermal growth factor receptor (EGF-r: C-erbB-1).
- The rat counterpart of C-erbB-2 is known as the proto-neu gene.
Purpose of the Study:
- To investigate the mechanisms by which the C-erbB-2 gene acquires transforming capabilities.
- To understand the expression patterns of C-erbB-2 in human development and tumors.
- To correlate C-erbB-2 amplification or overexpression with tumor malignancy and metastatic potential.
Main Methods:
- Molecular hybridization under relaxed conditions to identify C-erbB-2.
- Analysis of NIH 3T3 cell transformation induced by C-erbB-2 alterations.
- Examination of C-erbB-2 expression in human embryonic and adult tissues.
- Assessment of C-erbB-2 gene amplification and overexpression in human tumors.
Main Results:
- C-erbB-2 transforms NIH 3T3 cells via specific mutations (e.g., Val659Glu), C-terminal deletions, or gene amplification/overexpression.
- C-erbB-2 is expressed in human embryos (mucous membranes, glands) but minimally in adult tissues.
- High C-erbB-2 expression or amplification in human tumors correlates with increased risk of metastasis and higher malignancy.
Conclusions:
- The C-erbB-2 (HER-2) gene's transforming ability is linked to specific genetic alterations and overexpression.
- Aberrant expression of C-erbB-2 in tumors is a significant indicator of poor prognosis.
- Further research into C-erbB-2 is crucial for understanding cancer progression and developing targeted therapies.
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