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Latest publication 01/30/2011

Diabetes mellitus abrogates erythropoietin-induced cardioprotection against isch

Recent studies reported cardioprotective effects of erythropoietin (EPO) against ischemia-reperfusion (I/R) injury through activation of the...

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    [title] => Diabetes mellitus abrogates erythropoietin-induced cardioprotection against isch
    [paragraph] => Diabetes mellitus abrogates erythropoietin-induced cardioprotection against ischemic-reperfusion injury by alteration of the RISK/GSK-3_ signaling. 
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Authors
N. Ghaboura, S. Tamareille, P.-H. Ducluzeau, L. Grimaud, L. Loufrani et al. 

 Lab
Protection et Remodelage du Myocarde, UPRES EA 3860, Université d'Angers, Faculté de Médecine, Angers, France.
Journal
Basic Research in Cardiology
Abstract
Recent studies reported cardioprotective effects of erythropoietin (EPO) against ischemia-reperfusion (I/R) injury through activation of the reperfusion injury salvage kinase (RISK) pathway. As RISK has been reported to be impaired in diabetes and insulin resistance syndrome, we examined whether EPO-induced cardioprotection was maintained in rat models of type 1 diabetes and insulin resistance syndrome. Isolated hearts were obtained from three rat cohorts: healthy controls, streptozotocin (STZ)-induced diabetes, and high-fat diet (HFD)-induced insulin resistance syndrome. All hearts underwent 25 min ischemia and 30 min or 120 min reperfusion. They were assigned to receive either no intervention or a single dose of EPO at the onset of reperfusion. In hearts from healthy controls, EPO decreased infarct size (14.36 ± 0.60 and 36.22 ± 4.20% of left ventricle in EPO-treated and untreated hearts, respectively, p < 0.05) and increased phosphorylated forms of Akt, ERK1/2, and their downstream target GSK-3_. In hearts from STZ-induced diabetic rats, EPO did not decrease infarct size (32.05 ± 2.38 and 31.88 ± 1.87% in EPO-treated and untreated diabetic rat hearts, respectively, NS) nor did it increase phosphorylation of Akt, ERK1/2, and GSK-3_. In contrast, in hearts from HFD-induced insulin resistance rats, EPO decreased infarct size (18.66 ± 1.99 and 34.62 ± 3.41% in EPO-treated and untreated HFD rat hearts, respectively, p < 0.05) and increased phosphorylation of Akt, ERK1/2, and GSK-3_. Administration of GSK-3_ inhibitor SB216763 was cardioprotective in healthy and diabetic hearts. STZ-induced diabetes abolished EPO-induced cardioprotection against I/R injury through a disruption of upstream signaling of GSK-3_. In conclusion, direct inhibition of GSK-3_ may provide an alternative strategy to protect diabetic hearts against I/R injury.
BIOSEB Instruments Used
Non Invasive Pressure Measurement (LE5001),Warming chambers for pressure measurement (LE5610)
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