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Mar. Drugs 2018, 16(9), 328;

Pyropia yezoensis Protein Supplementation Prevents Dexamethasone-Induced Muscle Atrophy in C57BL/6 Mice

Institute of Fisheries Sciences, Pukyong National University, Busan 46041, Korea
Department of Marine Bio-Materials & Aquaculture, Pukyong National University, Busan 48513, Korea
Department of Food Science and Nutrition, Pukyong National University, Busan 48513, Korea
Authors to whom correspondence should be addressed.
Received: 22 August 2018 / Revised: 5 September 2018 / Accepted: 9 September 2018 / Published: 11 September 2018
(This article belongs to the Special Issue The Pharmacological Potential of Marine-Derived Peptides and Proteins)
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We investigated the protective effects of Pyropia yezoensis crude protein (PYCP) against dexamethasone (DEX)-induced myotube atrophy and its underlying mechanisms. DEX (3 mg/kg body weight, intraperitoneal injection) and PYCP (150 and 300 mg/kg body weight, oral) were administrated to mice for 18 days, and the effects of PYCP on DEX-induced muscle atrophy were evaluated. Body weight, calf thickness, and gastrocnemius and tibialis anterior muscle weight were significantly decreased by DEX administration (p < 0.05), while PYCP supplementation effectively prevented the DEX-induced decrease in body weight, calf thickness, and muscle weight. PYCP supplementation also attenuated the DEX-induced increase in serum glucose, creatine kinase, and lactate dehydrogenase levels. Additionally, PYCP supplementation reversed DEX-induced muscle atrophy via the regulation of the insulin-like growth factor-I/protein kinase B/rapamycin-sensitive mTOR complex I/forkhead box O signaling pathway. The mechanistic investigation revealed that PYCP inhibited the ubiquitin-proteasome and autophagy-lysosome pathways in DEX-administrated C57BL/6 mice. These findings demonstrated that PYCP increased protein synthesis and decreased protein breakdown to prevent muscle atrophy. Therefore, PYCP supplementation appears to be useful for preventing muscle atrophy. View Full-Text
Keywords: dexamethasone; muscle atrophy; protein breakdown; protein synthesis; Pyropia yezoensis dexamethasone; muscle atrophy; protein breakdown; protein synthesis; Pyropia yezoensis

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Lee, M.-K.; Choi, J.-W.; Choi, Y.H.; Nam, T.-J. Pyropia yezoensis Protein Supplementation Prevents Dexamethasone-Induced Muscle Atrophy in C57BL/6 Mice. Mar. Drugs 2018, 16, 328.

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