gamma -Secretase cleavage and nuclear localization of ErbB-4 receptor tyrosine kinase
- PMID: 11679632
- DOI: 10.1126/science.1065412
gamma -Secretase cleavage and nuclear localization of ErbB-4 receptor tyrosine kinase
Abstract
ErbB-4 is a transmembrane receptor tyrosine kinase that regulates cell proliferation and differentiation. After binding of its ligand heregulin (HRG) or activation of protein kinase C (PKC) by 12-O-tetradecanoylphorbol-13-acetate (TPA), the ErbB-4 ectodomain is cleaved by a metalloprotease. We now report a subsequent cleavage by gamma-secretase that releases the ErbB-4 intracellular domain from the membrane and facilitates its translocation to the nucleus. gamma-Secretase cleavage was prevented by chemical inhibitors or a dominant negative presenilin. Inhibition of gamma-secretase also prevented growth inhibition by HRG. gamma-Secretase cleavage of ErbB-4 may represent another mechanism for receptor tyrosine kinase-mediated signaling.
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