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Can J Physiol Pharmacol. 2016 Mar;94(3):324-31. doi: 10.1139/cjpp-2015-0040. Epub 2015 Sep 18.

Nandrolone decanoate negatively reverses the beneficial effects of exercise on cardiac muscle via sarcolemmal, but not mitochondrial K(ATP) channel.

Author information

1
a Department of Physiology and Pharmacology, School of Medicine, Alborz University of Medical Sciences, Karaj, Iran.
2
b Department of Physiology, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran.
3
c Deptartment of Physiology, School of Medicine, Shahid Sadoughi University of Medical Sciences, Yazd, Iran.
4
d Department of Pharmacology, School of Medicine, Shiraz University of Medical Sciences, Shiraz, Iran.
5
e Department of Anatomy, School of Medicine, Zanjan University of Medical Sciences, Zanjan, Iran.

Abstract

ATP-sensitive potassium channels are supposed to have a substantial role in improvement of cardiac performance. This study was performed to evaluate whether nandrolone decanoate (ND) and (or) exercise training could affect the expression of cardiac K(ATP) channel subunits. Thirty-five male albino Wistar rats were randomly divided into 5 groups, including sedentary control (SC), sedentary vehicle (SV), sedentary ND (SND), exercise control (EC), and exercise and ND (E+ND). Exercise training was performed on a treadmill 5 times per week. ND was injected (10 mg/kg/week, i.m.) to the rats in the SND and E+ND groups. Following cardiac isolation, the expression of both sarcolemmal and mitochondrial subunits of K(ATP) channel was measured using Western blot method. The expression of sarcolemmal, but not mitochondrial, subunits of K(ATP) channel (Kir6.2 and SUR2) of EC group was significantly higher compared with SC group while ND administration (SND group) did not show any change in their expression. In the E+ND group, ND administration led to decrease of the over-expression of sarcolemmal Kir6.2 and SUR2 which was previously induced by exercise. There was no significant association between the mitochondrial expression of either Kir6.2 or SUR2 proteins and administration of ND or exercise. Supra-physiological dosage of ND negatively reverses the effects of exercise on the cardiac muscle expression of sarcolemmal, but not mitochondrial, K(ATP) channel subunits.

KEYWORDS:

KATP channel; Kir6.2; SUR2; canal KATP; d├ęcanoate de nandrolone; entra├«nement physique; exercise; mitochondria; mitochondrie; nandrolone decanoate; sarcolemma; sarcolemme

PMID:
26909616
DOI:
10.1139/cjpp-2015-0040
[Indexed for MEDLINE]

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