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The VEGF-A gene encodes ligands that are involved in orchestrating new blood vessel growth during embryonic and postnatal development, and then in homeostatic survival of endothelial cells, as well as in physiological and pathological situations inthe adult. VEGF signaling via three receptor tyrosine kinases(VEGFR-1¨C3) is regulated at multiple levels, reflecting thiscomplexity of purpose. Thus, VEGF gene expression can by upregulated both by hypoxia and by oncogene signaling .Additionally, VEGF ligands can be sequestered in the extracellular matrix in latent forms that are subject to release and activation by extracellular matrix-degrading proteasesIn addition, other proangiogenicsignals, such as members of the fibroblast growth factor (FGF)family, have been implicated in sustaining tumor angiogenesiswhen their expression is chronically upregulated |
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RXMCDM: ½ð±Ò+1 2014-04-23 09:39:22
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RXMCDM: ½ð±Ò+1 2014-04-23 09:39:22
ÕæÇ¿±ØÊ¤: ½ð±Ò+2, лл 2014-04-24 09:30:44
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