Dietary Supplementation with Shiikuwasha Extract Attenuates Dexamethasone-induced Skeletal Muscle Atrophy in Aged Rats

Overview

Journal Springerplus

Date 2016 Jul 9

PMID 27390656

Citations 7

Authors

Yasuyuki Sakata

Tomoyuki Okamoto

Kazutaka Oshio

Hirohiko Nakamura

Hiroshi Iwamoto

Kazuyoshi Namba

Yasuhiro Takeda

Fumiaki Yoshizawa

Affiliations

Soon will be listed here.

Abstract

Background: Skeletal muscle atrophy is caused by a variety of diseases and conditions. In particular, skeletal muscle atrophy in the elderly contributes to a loss of independence with advanced age and increases the risk of falling. However, the effect of food consumed on a daily basis on skeletal muscle atrophy has been the focus of little research. In this study, the effects of dietary supplementation with shiikuwasha extract or grape extract on dexamethasone-induced skeletal muscle atrophy were evaluated in aged rats.

Methods: Aged male rats (15-month-old) were fed a diet supplemented with either 1 % shiikuwasha extract or 1 % grape extract for 19 days. During the last 5 days of the feeding period, rats were injected with dexamethasone to induce muscle atrophy.

Results: Body weight and hind-limb muscle weight were significantly decreased by dexamethasone treatment. The supplementation of shiikuwasha extract showed no effect on body weight loss, but markedly attenuated tibialis anterior muscle weight loss induced by dexamethasone. On the other hand, grape extract did not affect muscle weight loss. Furthermore, shiikuwasha extract significantly reduced dexamethasone-induced expression of atrogin-1 and MuRF1 mRNA, but did not reduce LC3B-II protein levels.

Conclusion: These results suggest that shiikuwasha extract may partially inhibit the activation of the ubiquitin-proteasome system and may consequently attenuate skeletal muscle atrophy induced by dexamethasone in aged rats.

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