Gene/Protein Disease Symptom Drug Enzyme Compound
Pivot Concepts:   Target Concepts:
Query: UNIPROT:P04626 (erbB-2)
 5,251 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Much attention has recently focused upon hepatocyte growth factor (HGF) as a potential regulator of epithelial branching morphogenesis. However, since neither the HGF nor c-met "knockout" mice show abnormal kidney branching morphogenesis, we sought to analyze the relative importance of HGF in in vitro branching morphogenesis compared with other factors secreted by the embryonic kidney. Exploiting an assay that employs kidney epithelial cells (murine inner medullary collecting duct, mIMCD3) seeded in collagen cocultured with the embryonic kidney, we found that a tyrosine kinase inhibitor that is highly specific for the epidermal growth factor (EGF) receptor (EGFR), tyrphostin AG1478, inhibited mIMCD3 cell process formation (an early step in branching tubulogenesis) by 40%, whereas high concentrations of neutralizing anti-HGF antibodies had a lesser effect (20% inhibition), suggesting that EGFR ligands account for a larger fraction of branching morphogens secreted by the embryonic kidney than HGF. In addition, when an embryonic epithelial cell line derived from c-met (-/-) mice was cocultured with the embryonic kidney, these c-met (-/-) cells underwent process formation. EGFR ligands but not HGF were able to induce branching tubulogenesis in these cells. All EGFR ligands tested, including EGF, transforming growth factor-alpha, heparin-binding EGF, betacellulin, and amphiregulin, induced mIMCD3 cell tubulogenesis. EGFR ligands caused upregulation of urokinase, urokinase receptor, and matrix metalloprotease-1, and tubulogenesis could be inhibited by the metalloprotease inhibitor 1,10-phenanthroline. Our results support the notion that multiple parallel and potentially redundant growth factor-dependent pathways regulate branching tubulogenesis.
 ...
PMID:EGF receptor ligands are a large fraction of in vitro branching morphogens secreted by embryonic kidney. 932 21

Neuromedin B (NMB), a member of the bombesin family of peptides, is an autocrine growth factor for many lung cancer cells. The present study investigated the ability of NMB to cause transactivation of the epidermal growth factor (EGF) receptor in lung cancer cells. By Western blot, addition of NMB or related peptides to NCI-H1299 human non-small cell lung cancer (NSCLC) cells, caused phosphorylation of Tyr(1068) of the EGF receptor. The signal was amplified using NCI-H1299 cells stably transected with NMB receptors. The transactivation of the EGF receptor or the tyrosine phosphorylation of ERK caused by NMB-like peptides was inhibited by AG1478 or gefitinib (tyrosine kinase inhibitors) and NMB receptor antagonist PD168368 but not the GRP receptor antagonist, BW2258U89. The transactivation of the EGF receptor caused by NMB-like peptides was inhibited by GM6001 (matrix metalloprotease inhibitor), PP2 (Src inhibitor), or transforming growth factor (TGF)alpha antibody. The transactivation of the EGF receptor and the increase in reactive oxygen species caused by NMB-like peptides was inhibited by N-acetylcysteine (NAC) or Tiron. Gefitinib inhibited the proliferation of NCI-H1299 cells and its sensitivity was increased by the addition of PD168368. The results indicate that the NMB receptor regulates EGF receptor transactivation by a mechanism dependent on Src as well as metalloprotease activation and generation of reactive oxygen species.
 ...
PMID:Neuromedin B receptors regulate EGF receptor tyrosine phosphorylation in lung cancer cells. 2038 7