Tanespimycin, also known as 17-AAG, is an orally bioavailable, small-molecule inhibitor of several receptor protein tyrosine kinases with potential antiangiogenic and antineoplastic activities. Telatinib binds to and inhibits the vascular endothelial growth factor receptors (VEGFRs) type 2 and 3, platelet-derived growth factor receptor beta (PDGFRb) and c-Kit, which may result in the inhibition of angiogenesis and cellular proliferation in tumors in which these receptors are upregulated. These telatinib-inhibited receptor protein tyrosine kinases are overexpressed or mutated in many tumor cell types and may play key roles in tumor angiogenesis and tumor cell proliferation. 17-AAG is a synthetic analogue of the benzoquinone ansamycin antibiotic geldanamycin and has also been found to inhibit the molecular chaperone Hsp90.
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