Impact of a novel cardioprotective agent on the ischaemia-reperfusion-induced Akt kinase activation.

Abstract:

:Cardioprotective effect of a free radical-scavenging compound (HO-3073) was examined during ischaemia-reperfusion (IR) in isolated heart perfusion system and its influence on the pro-survival Akt signalling pathway was addressed. Rat hearts were perfused according to the Langendorff method and subjected to a global 25-min ischaemia and 15, 45 and 90-min reperfusion either untreated or treated with HO-3073 (2, 5 and 10 microM) and/or wortmannin (100 nM, inhibitor of phosphatidylinositol-3-kinase). HO-3073 facilitated the recovery of myocardial energy metabolism as assessed by 31P NMR spectroscopy (creatine phosphate recovery in reperfusion was 76+/-5%, while in untreated hearts 32+/-4%). Functional performance of the hearts followed by a left ventricular balloon manometer was also markedly improved by HO-3073 administration (recovery of rate-pressure product related to normoxia was 47+/-3%, while in untreated hearts 12+/-3%). HO-3073 diminished the infarct size measured by TTC staining (29+/-6% as opposed to 64+/-7% in untreated ischaemia-reperfusion). HO-3073 also significantly attenuated lipid peroxidation (thiobarbituric acid reactive substances) and protein oxidation (protein carbonyl content) compared to untreated hearts. HO-3073 enhanced the ischaemia-reperfusion-triggered phosphorylation of Akt-1 (activation) and glycogen synthase kinase-3 beta (inactivation) as evidenced by Western blot analysis. Wortmannin co-administration neutralised the beneficial effects of HO-3073 on cardiac energetics, contractile function, infarct size, as well as Akt signalling. Our results first display that a radical-scavenging molecule possesses the ability to intensify the pro-survival functioning of phosphatidylinositol-3-kinase/Akt pathway, which is presumed to play an additive role in the cardioprotective properties of HO-3073.

journal_name

Biochem Pharmacol

journal_title

Biochemical pharmacology

authors

Toth A,Kovacs K,Deres P,Halmosi R,Czopf L,Hanto K,Kalai T,Hideg K,Sumegi B,Toth K

doi

10.1016/j.bcp.2003.08.007

subject

Has Abstract

pub_date

2003-12-01 00:00:00

pages

2263-72

issue

11

eissn

0006-2952

issn

1873-2968

pii

S0006295203006257

journal_volume

66

pub_type

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