Abstract
Heparin-binding epidermal growth factor-like growth factor (HB-EGF) is a potent mitogen and chemotactic factor for fibroblasts, smooth muscle cells and keratinocytes. It is demonstrated that HB-EGF is not only a ligand for HER1, as previously reported, but for HER4 as well. HB-EGF binds to NIH 3T3 cells overexpressing either HER1 or HER4 alone, but not HER2 or HER3 alone. Binding to HER4 is independent of HER1. The ability of HB-EGF to bind to two different receptors is in contrast to EGF which binds to HER1, but not to HER4, and heregulin-beta1 which binds to HER4, but not to HER1. Besides binding, HB-EGF activates HER4. For example (i) it induces tyrosine phosphorylation of HER4 in cells overexpressing this receptor and of endogenous HER4 in MDA-MB-453 cells and astrocytes; (ii) it induces association of phosphatidylinositol 3-kinase (PI3-K) activity with HER4; and (iii) it is a potent chemotactic factor for cells overexpressing HER4. Chemotaxis is inhibited by wortmannin, a PI3-K inhibitor, suggesting a possible role for PI3-K in mediating HB-EGF-stimulated chemotaxis. On the other hand, HB-EGF is not a mitogen for cells expressing HER4, in contrast to its ability to stimulate both chemotaxis and proliferation in cells expressing HER1. It was concluded that HER4 is a newly described receptor for HB-EGF and that HB-EGF can activate two EGF receptor subtypes, HER1 and HER4, but with different biological responses.
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