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Chronic treatment with the peroxisome proliferator-activated receptor alpha agonist Wy-14,643 attenuates myocardial respiratory capacity and contractile function.

Abstract：

:We investigated whether chronic in vivo treatment with the peroxisome proliferator-activated receptor alpha agonist Wy-14,643 attenuates cardiac contractile function by impairing mitochondrial respiration. Wy-14,643 (25 mg kg(-1) day(-1)) was administered to Wistar rats by oral gavage for 14 consecutive days, after which ex vivo heart function, myocardial mitochondrial respiratory capacity, and metabolic gene expression were determined. Body and heart weights were not significantly altered following 14 days of Wy-14,643 administration. Heart perfusion studies showed significantly reduced systolic and developed pressures, while the rate pressure product declined by 36 +/- 2.6% (P < 0.01 vs. vehicle) after 14 days of Wy-14,643 treatment. State 3 mitochondrial respiration was lower in the Wy-14,643 group (P = 0.06 vs. vehicle). State 4 respiration and oligomycin-insensitive proton leak were significantly increased compared with matched controls. The rate of ADP phosphorylation was also decreased by 44.9 +/- 1.9% (P < 0.05 vs. vehicle). Pyruvate dehydrogenase kinase 4 (PDK4) and uncoupling protein 3 (UCP3) transcript levels were upregulated, while cytochrome oxidase II (COXII) expression was decreased following Wy-14,643 treatment. This study demonstrates that chronic in vivo Wy-14,643 administration impaired cardiac contractile function in parallel with decreased mitochondrial respiratory function and increased uncoupling.

journal_name

Mol Cell Biochem

journal_title

Molecular and cellular biochemistry

authors

Zungu M,Young ME,Stanley WC,Essop MF

doi

10.1007/s11010-009-0100-y

subject

Has Abstract

pub_date

2009-10-01 00:00:00

pages

55-62

issue

1-2

eissn

0300-8177

issn

1573-4919

journal_volume

330

pub_type

杂志文章

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