Abstract:
:The HER-2/neu proto-oncogene is homologous with, but distinct from, the epidermal growth factor receptor. Current evidence indicates that this gene is frequently amplified and/or overexpressed in some human breast and ovarian cancers and that these alterations may be clinically important; however, little is known about the expression pattern of the gene in normal tissues. Using immunohistochemistry and northern blot analyses to identify the HER-2/neu protein and transcript respectively, we have evaluated a variety of normal adult and fetal tissues for HER-2/neu expression. HER-2/neu protein was identified on cell membranes of epithelial cells in the gastro-intestinal, respiratory, reproductive, and urinary tract as well as in the skin, breast and placenta. Northern hybridization confirmed the presence of the 4.5 kb transcript encoding the protein in these tissues. The amount of HER-2/neu message and protein was generally higher in fetal tissues than in the corresponding normal adult tissues. HER-2/neu expression levels in these normal tissues were similar to the levels found in non-amplified, non-overexpressing breast cancers and breast cancer cell lines. Southern hybridization of extracted DNA showed that none of the normal tissues expressing HER-2/neu had amplification of the gene. These results confirm that HER-2/neu is normally a membrane constituent of a variety of epithelial cell types.
journal_name
Oncogenejournal_title
Oncogeneauthors
Press MF,Cordon-Cardo C,Slamon DJsubject
Has Abstractpub_date
1990-07-01 00:00:00pages
953-62issue
7eissn
0950-9232issn
1476-5594journal_volume
5pub_type
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