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描述:
HB-EGF was originally purified based on its heparinbinding property and mitogenic activity
on BALB-3T3 fibroblasts from the conditioned medium of the human U-937 histiocytic
lymphoma cell line. The natural protein has an apparent molecular mass of 19 -23 kDa and
exists in multiple forms as a result of heterogenous Oglycosylation and/or Nterminal
truncation. In addition to fibroblasts, HB-EGF is also a potent mitogen for keratinocytes and
smooth muscle cells but not for capillary endothelial cells. HB-EGF is produced in monocytes
and macrophages. In addition, transcription of HB-EGF can be induced in vascular endothelial
cells as well as aortic smooth muscle cells (SMC), suggesting that HB-EGF may have an
important role in the pathogenesis of atherosclerosis.
HB-EGF is a member of the EGF family of mitogens which also include transforming growth
factorα (TGF-α), amphiregulin (AR), rat schwanomaderived growth factor (SDGF), vaccinia
growth factor (VGF), and the various ligands for the HER2/erbB2/neu receptor. All these
cytokines are derived from transmembrane precursors that contain one or several EGF
structural units in their extracellular domain. Many of these transmembrane precursors are
biologically active and seem to play a role in juxtacrine stimulation of adjacent cells.
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