Abstract
Thymol is a major component of thyme, and it has been reported that thymol administration reduces body weight, plasma insulin and blood glucose in type-2 diabetes. Skeletal muscle is the most important metabolism organs in the body; however, to date, there is no report on the effect of thymol on skeletal muscle. Our goal was to determine whether thymol has an effect on the different types of skeletal muscle fibers and their metabolism characteristics. Hence, we performed in vivo and in vitro experiments. In vivo, SD rats (4 weeks old) were fed with different concentrations of thymol for 4 weeks, and in vitro C2C12 myotubes were directly treated with thymol for 2 days. The rats fed with 0.025% thymol showed a significantly lower body weight, subcutaneous white adipose tissue index and gastrocnemius muscle index (P < 0.05), while their proportion of brown adipose tissue significantly increased (P < 0.05). The protein and mRNA expression of MyHC I and MyHC IIa in the gastrocnemius muscle of the rats significantly increased (P < 0.05), while the protein level of MyHC II and mRNA expression of MyHC IIb decreased (P < 0.05). Furthermore, 0.025% thymol supplement significantly reduced (P < 0.05) the activity of lactate dehydrogenase (...Continue Reading
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