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• W2068160958 endingPage "4917" @default.
• W2068160958 startingPage "4906" @default.
• W2068160958 abstract "Both IGF-I and IGF-II stimulate migration of human extravillous trophoblast (EVT) cells. Although IGF-I is known to signal through IGF type 1 receptor (IGF1R), IGF-II signals through IGF1R as well as in an IGF1R-independent manner. The purpose of this study was to investigate the roles of Rho GTPases in IGF1R-independent and -dependent actions of IGF-II on EVT cell migration. To distinguish IGF1R-dependent and -independent actions, we used picropodophyllin, a selective inhibitor of IGF1R tyrosine kinase, and IGF analogs with differential affinities for IGF1R, IGF-II/cation-independent mannose 6-phosphate receptor, and IGF-binding proteins. IGF1R-dependent actions of IGF-II were confirmed by showing the effects of IGF1R-selective agonist Des1-3 IGF-I. We used pharmacological inhibitors or selective small interfering RNAs to investigate the roles of RhoA, RhoC, Rac1, Cdc42, and Rho effector kinases called ROCK-I and -II in IGF-induced EVT cell migration. Although basal migration of EVT cells required each member of the Rho GTPase family studied, IGF1R-dependent and -independent EVT cell migration exhibited differential requirements for these enzymes. IGF1R-mediated EVT cell migration was found to depend on RhoA and RhoC but not on Rac1 or Cdc42. However, IGF1R-independent effect of IGF-II on EVT cell migration required ROCKs but not RhoA, RhoC, Rac1, or Cdc42. Most importantly, IGF1R-independent action of IGF-II was found to be exaggerated when RhoA or RhoC was down-regulated. Thus, different members of the Rho GTPase family regulate IGF-II-mediated EVT cell migration differentially, depending upon whether it signals through IGF1R or in an IGF1R-independent manner." @default.
• W2068160958 created "2016-06-24" @default.
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• W2068160958 date "2007-10-01" @default.
• W2068160958 modified "2023-10-01" @default.
• W2068160958 title "Rho Guanosine 5′-Triphosphatases Differentially Regulate Insulin-Like Growth Factor I (IGF-I) Receptor-Dependent and -Independent Actions of IGF-II on Human Trophoblast Migration" @default.
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• W2068160958 doi "https://doi.org/10.1210/en.2007-0476" @default.
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