Abstract:
:Heparin-binding epidermal growth factor (EGF)-like growth factor (HB-EGF) is a member of the EGF family of polypeptide growth factors, which includes EGF, transforming growth factor alpha(TGF-alpha), amphiregulin (AR) and betacellulin (BTC). To assess the potential role of HB-EGF in human gastric carcinomas, the expression of HB-EGF and EGF receptor (EGF-R) was examined in normal and cancerous gastric tissues and cultured gastric cancer cell lines. By Northern blot analysis, there was a 4.7-fold increase in HB-EGF mRNA levels in human gastric cancers compared with normal gastric tissues. There was a concomitant 3.9-fold increase in EGF-R mRNA levels in these cancers. Immunostaining revealed co-localization in 72% of the cancer cells of HB-EGF and EGF-R. AR and BTC moieties were not evident by Northern blot analysis. However, using PCR, both AR and BTC mRNA species were demonstrated in normal and cancerous gastric tissues. By Northern blot analysis, HB-EGF, TGF-alpha, AR, BTC and EGF-R mRNA moieties were co-expressed in KATO III and NCI-N87 gastric cancer cell lines. Furthermore, HB-EGF, EGF and TGF-alpha enhanced the growth of both cell lines in a dose-dependent manner. Our findings suggest that HB-EGF is relatively abundant in human gastric cancers and that co-expression of the EGF ligand family may lead to excessive activation of EGF-R in this disorder.
journal_name
Int J Cancerjournal_title
International journal of cancerauthors
Naef M,Yokoyama M,Friess H,Büchler MW,Korc Mdoi
10.1002/(SICI)1097-0215(19960503)66:3<315::AID-IJCsubject
Has Abstractpub_date
1996-05-03 00:00:00pages
315-21issue
3eissn
0020-7136issn
1097-0215pii
10.1002/(SICI)1097-0215(19960503)66:3<315::AID-IJCjournal_volume
66pub_type
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journal_title:International journal of cancer
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