title: Role of serum and glucocorticoid-regulated kinase-1 in the protective effects of erythropoietin during renal ischemia/reperfusion injury.
abstract: Erythropoietin (EPO) protects the kidneys from ischemia/reperfusion (I/R) injury; however, the exact signalling mechanisms are not fully understood. The serum and glucocorticoid-regulated kinase 1 (SGK1) is an anti-apoptotic protein kinase regulated through the phosphatidylinositol 3-kinase (PI3-kinase) pathway by cellular stimuli, hormones and growth factors. The objective of the present study was to examine the role of SGK1 in the renoprotective effects of EPO in renal I/R injury. In vitro, cultures of HEK293 cells were exposed to 16h hypoxia. Incubation with EPO at a doses of 400U/ml exerted a protective effect on cell death assessed by LDH release and Annexin V FACS analysis. This was paralleled by up-regulation of SGK1 expression, as well as phosphorylation. Downregulation of SGK1 expression by small interfering RNA technique ameliorated the anti-apoptotic effect of EPO treatment. In an in vivo rat model of unilateral renal I/R injury, rats were treated with 500U/kg EPO 24h prior to ischemia. EPO resulted in less severe tissue injury and ameliorated the elevation in creatinine and urea nitrogen levels 24h after reperfusion. Furthermore, SGK1 expression and phosphorylation were higher in EPO compared to vehicle-treated rats as demonstrated by real-time PCR, Western blot and immunofluorescence technique. We conclude that EPO protects from renal I/R injury and SGK1 might contribute to the mediation of EPO effects under ischemic conditions.
authors: First Department of Pediatrics, Semmelweis University, Budapest, Hungary. rusai@gyer1.sote.hu
authors: Krisztina
authors: K
authors: Rusai
authors: Agnes
authors: A
authors: Prókai
authors: Beáta
authors: B
authors: Szebeni
authors: Andrea
authors: A
authors: Fekete
authors: András
authors: A
authors: Treszl
authors: Adám
authors: A
authors: Vannay
authors: Veronika
authors: V
authors: Müller
authors: György
authors: G
authors: Reusz
authors: Uwe
authors: U
authors: Heemann
authors: Jens
authors: J
authors: Lutz
authors: Tivadar
authors: T
authors: Tulassay
authors: Attila J
authors: AJ
authors: Szabó
mesh_terms: D000818:Animals; D017209:Apoptosis / Q000187:drug effects; D002478:Cells, Cultured; D004921:Erythropoietin / Q000494:pharmacology*; D006801:Humans; D017874:Immediate-Early Proteins / Q000037:antagonists & inhibitors / Q000502:physiology*; D007668:Kidney / Q000098:blood supply*; D008297:Male; D010766:Phosphorylation; D017346:Protein Serine-Threonine Kinases / Q000037:antagonists & inhibitors / Q000502:physiology*; D051381:Rats; D017208:Rats, Wistar; D011994:Recombinant Proteins; D015427:Reperfusion Injury / Q000201:enzymology / Q000517:prevention & control*; D000099184:Serum-Glucocorticoid Regulated Kinases
chemical_list: D004921:Erythropoietin; D017874:Immediate-Early Proteins; D017346:Protein Serine-Threonine Kinases; D011994:Recombinant Proteins; D000099184:Serum-Glucocorticoid Regulated Kinases; C103998:epoetin beta