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We studied the activity of mutants involving the aminoterminal extracellular, seven-transmembrane (7TM) and carboxy-terminal tail domains of the human Ca2+ receptor to gain insight into the functional interactions between these domains during receptor activation. Missense mutations of highly conserved residues, D190 and E297, in the extracellular domain (ECD), and a mutation within part of the proximal...
Insulin-like growth factor-I (IGF-I) plays an essential role in reproductive function. Leydig cells express specific IGF-I receptors, and IGF-I enhances human chorionic gonadorphin (hCG)-induced testosterone formation. In the present study, we evaluate the effect of IGF-I on the gene expression and protein levels of steroidogenic acute regulatory protein (StAR), the rate-limiting step in steroidogenesis...
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