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SGK, renal function and hypertension Lang F; Huang DY; Vallon VJ Nephrol 2010[Nov]; 23 Suppl 16 (0 16): S124-9Serum- and glucocorticoid-inducible kinase 1 (SGK1) is expressed following cell stress and exposure to a variety of hormones including glucocorticoids and mineralocorticoids. It is activated by insulin and growth factors via phosphatidylinositol-3-kinase and the 3-phosphoinositide-dependent kinase PDK1. SGK1 enhances the activity of a variety of ion channels such as ENaC, TRPV5, ROMK, KCNE1/KCNQ1 and ClCKb; carriers such as NHE3, NKCC2, NCC and SGLT1; as well as the Na+/K+-ATPase. SGK1 contributes to Na+ retention and K+ elimination of the kidney as well as mineralocorticoid stimulation of salt appetite. A certain SGK1 gene variant (combined polymorphisms in intron 6 [I6CC] and in exon 8 [E8CC/CT]) is associated with moderately enhanced blood pressure. The SGK1 gene variant has been shown to affect 3%-5% of whites and some 10% of Africans. The gene variant sensitizes the carriers to the hypertensive effects of hyperinsulinemia. Moreover, the SGK1 gene variant is associated with increased body mass index, presumably a result of enhanced SGLT1 activity with accelerated intestinal glucose absorption. Obesity predisposes the carriers of the gene variant to development of type 2 diabetes. Moreover, SGK1 stimulates coagulation. Thus, SGK1 may participate in the pathogenesis of metabolic syndrome or syndrome X, a condition characterized by the coincidence of essential hypertension, procoagulant state, obesity, insulin resistance and hyperinsulinemia.|Animals[MESH]|Epithelial Sodium Channels/physiology[MESH]|Humans[MESH]|Hypertension/*etiology[MESH]|Immediate-Early Proteins/*physiology[MESH]|Kidney/*physiology[MESH]|Metabolic Syndrome/etiology[MESH]|Protein Serine-Threonine Kinases/*physiology[MESH]|Sodium/metabolism[MESH] |
