Supplementation with olive oil, but not fish oil, improves cutaneous wound healing in stressed mice

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Abstract

Supplementation with olive and fish oils reverses the effects of stress on behavioral activities and adrenal activation. However, previous studies have not shown whether supplementation with olive and fish oil could inhibit the effects of stress on cutaneous wound healing. Thus, this study investigated the effects of supplementation with fish or olive oil on cutaneous healing in stressed mice. Mice were subjected to rotational stress and treated with olive or fish oil daily until euthanasia. An excisional lesion was created on each mouse, and 14 days later, the lesions were analyzed. In addition, murine skin fibroblasts were exposed to elevated epinephrine levels plus olive oil, and fibroblast activity was evaluated. In the in vivo studies, administration of olive oil, but not fish oil, inhibited stress-induced reduction in wound contraction, reepithelialization, hydroxyproline levels, and blood vessel density. Stress-induced increases in vascular endothelial growth factor expression and the numbers of macrophages and neutrophils were reversed only by olive oil. Both oils reversed stress-induced increase in catecholamine levels and oxidative damage. In in vitro studies, olive oil treatment reversed the reduction in fibroblast migration and collagen deposition and the increase in lipid peroxidation induced by epinephrine. In conclusion, supplementation with olive oil, but not fish oil, improves cutaneous wound healing in chronically stressed mice.

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