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Human ortholog of Drosophila Melted impedes SMAD2 release from TGF-? receptor I to inhibit TGF-? signaling #MMPMID26039994
Shathasivam P; Kollara A; Ringuette MJ; Virtanen C; Wrana JL; Brown TJ
Proc Natl Acad Sci U S A 2015[Jun]; 112 (23): E3000-9 PMID26039994show ga
Ventricular zone expressed pleckstrin homology domain-containing 1 (VEPH1) is among genes on chromosome 3q24-26, a region amplified in several cancers. Although little is known of mammalian VEPH1, its Drosophila ortholog, Melted, is involved in neural and eye development, metabolism, and size determination through effects on Forkhead box O, target of rapamycin, and Hippo signaling. We show that VEPH1 expression affects similar gene categories as Melted and potently inhibits transforming growth factor-? (TGF-?) signaling. VEPH1 interacts with TGF-? type I receptor (T?RI) and inhibits dissociation of activated Sma- and Mad-related protein 2 from T?RI, resulting in impaired TGF-? signaling. TGF-? acts initially as a tumor suppressor through its cytostatic activity, but subsequently promotes tumor progression. These findings suggest that VEPH1 could affect TGF-? activity during cancer development/progression.