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Am J Physiol Regul Integr Comp Physiol (May 14, 2008). doi:10.1152/ajpregu.90374.2008
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Submitted on April 21, 2008
Revised on May 7, 2008
Accepted on May 13, 2008

Chronically ischemic mouse skeletal muscle exhibits myopathy in association with mitochondrial dysfunction and oxidative damage

Iraklis I. Pipinos1*, Stanley A. Swanson, Zhen Zhu, Aikaterini A. Nella, Dustin J. Weiss, Tanuja L. Gutti, Rodney D. McComb, B. Timothy Baxter, Thomas G. Lynch, and George P. Casale

1 Univ of Nebraska

* To whom correspondence should be addressed. E-mail: ipipinos{at}unmc.edu.

A myopathy characterized by mitochondrial pathology and oxidative stress is present in patients with peripheral arterial disease (PAD). Patients with PAD differ in disease severity, mode of presentation and presence of comorbid conditions. In this study we used a mouse model of hindlimb ischemia to isolate and directly investigate the effects of chronic inflow arterial occlusion on skeletal muscle microanatomy, mitochondrial function and expression, and oxidative stress. Hindlimb ischemia was induced by staged ligation/division of the common femoral and iliac arteries in C57BL/6 mice and muscles were harvested twelve weeks later. Muscle microanatomy was examined by bright-field microscopy and mitochondrial content was determined as citrate synthase activity in muscle homogenates and ATP synthase expression by fluorescence microscopy. Electron transport chain (ETC) complexes I through IV were analyzed individually by respirometry. Oxidative stress was assessed as total protein carbonyls and 4-hydroxy-2-nonenal (HNE) adducts and altered expression and activity of manganese superoxide dismutase (MnSOD). Ischemic muscle exhibited histological features of myopathy and increased mitochondrial content compared to control muscle. Complex-dependent respiration was significantly reduced for ETC complexes I, III, and IV in ischemic muscle. Protein carbonyls, HNE adducts and MnSOD expression were significantly increased in ischemic muscle. MnSOD activity was not significantly changed suggesting MnSOD inactivation. Using a mouse model, we have demonstrated for the first time that inflow arterial occlusion alone, i.e., in the absence of other comorbid conditions causes myopathy with mitochondrial dysfunction and increased oxidative stress, recapitulating the muscle pathology of PAD patients.







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