Effects of Gravitational Loading Levels on Protein Expression Related to Metabolic And/or Morphologic Properties of Mouse Neck Muscles

Overview

Journal Physiol Rep

Specialty Physiology

Date 2014 Apr 19

PMID 24744868

Citations 5

Authors

Tomotaka Ohira

Takashi Ohira

Fuminori Kawano

Tsubasa Shibaguchi

Hirooki Okabe

Katsumasa Goto

Futoshi Ogita

Masamichi Sudoh

Roland Richard Roy

Victor Reggie Edgerton

Ranieri Cancedda

Yoshinobu Ohira

Affiliations

Soon will be listed here.

Abstract

The effects of 3 months of spaceflight (SF), hindlimb suspension, or exposure to 2G on the characteristics of neck muscle in mice were studied. Three 8-week-old male C57BL/10J wild-type mice were exposed to microgravity on the International Space Station in mouse drawer system (MDS) project, although only one mouse returned to the Earth alive. Housing of mice in a small MDS cage (11.6 × 9.8-cm and 8.4-cm height) and/or in a regular vivarium cage was also performed as the ground controls. Furthermore, ground-based hindlimb suspension and 2G exposure by using animal centrifuge (n = 5 each group) were performed. SF-related shift of fiber phenotype from type I to II and atrophy of type I fibers were noted. Shift of fiber phenotype was related to downregulation of mitochondrial proteins and upregulation of glycolytic proteins, suggesting a shift from oxidative to glycolytic metabolism. The responses of proteins related to calcium handling, myofibrillar structure, and heat stress were also closely related to the shift of muscular properties toward fast-twitch type. Surprisingly, responses of proteins to 2G exposure and hindlimb suspension were similar to SF, although the shift of fiber types and atrophy were not statistically significant. These phenomena may be related to the behavior of mice that the relaxed posture without lifting their head up was maintained after about 2 weeks. It was suggested that inhibition of normal muscular activities associated with gravitational unloading causes significant changes in the protein expression related to metabolic and/or morphological properties in mouse neck muscle.

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