Abstract
Steroid myopathy is a well-known adverse effect of glucocorticoids that causes muscle weakness and atrophy; however, its pathogenic mechanism is still unclear. Recently, oxidative stress was reported to contribute to steroid myopathy, but there is no report that actually attempts to measure hydroxyl radical. I developed an animal model of steroid myopathy in rat with dexamethasone (9-Fluoro-11beta,17, 21-trihydroxy-16alpha-methylpregna-1,4-diene-3,20-dione), and measured hydroxyl radical using the salicylate trapping method. There was significant dose-dependent relation between both 2,5- and 2,3-dihydroxybenzoic acids and dexamethasone in the treated group, compared to the control group. These results suggest that hydroxyl radical plays a role in the pathogenesis of steroid myopathy.
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