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Toxicologic Pathology
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Article

Fenofibrate-Induced Muscular Toxicity Is Associated with a Metabolic Shift Limited to Type-1 Muscles in Rats

Miyoko Okada*, Fumiko Sano, Itsuko Ikeda, Jiro Sugimoto, Shiro Takagi, Hiroki Sakai, and Tokuma Yanai

* To whom correspondence should be addressed. E-mail: Okada.Miyoko{at}mg.mt-pharma.co.jp.


  Abstract

Morphological changes and mRNA expression levels in type-1 predominant soleus and type-2 predominant tensor fasciae latae muscles of rats treated with fenofibrate were investigated. After fenofibrate by oral gavage at 300 mg/kg/day for 28 days, degeneration/necrosis and regeneration of muscle fibers, cellular infiltration, and fibrosis were seen in soleus muscle. Additionally, expression of PDK4, CPT1-M, CPT2, and FACO mRNAs was increased. In contrast, no morphological changes or mRNA induction were apparent in tensor fasciae latae muscle. These data suggest that sensitivity to fenofibrate-induced muscle toxicity differs among muscles, with only type-1 fibers being susceptible. The up-regulation of PDK4, CPTs and FACO mRNA expression in soleus muscle indicates that the energy source is switched from glucose to fatty acids, and this might be related to the observed fenofibrate-induced muscular toxicity.

First published on April 24, 2009, doi:10.1177/0192623309336151

Toxicologic Pathology 2009;37:517.

A more recent version of this article appeared on June 1, 2009

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