NDLI: Effects of heat stress on muscle mass and the expression levels of heat shock proteins and lysosomal cathepsin L in soleus muscle of young and aged mice

Content Provider	Springer Nature Link
Author	Oh, Yoshitaka Yamada, Sumio Goto, Ayumi Ikuta, Akihiro Sugiura, Takao Ohira, Yoshibu Yoshioka, Toshitada Goto, Katsumasa
Copyright Year	2012
Abstract	Effects of heat stress on skeletal muscle mass in young and aged mice were investigated. Young (7-week) and aged (106-week) male C57BL/6J mice were randomly assigned to control and heat-stressed groups in each age. Mice in heat-stressed group were exposed to heat stress (41 °C for 60 min) in an incubator without anesthesia. Seven days after the exposure, soleus muscles were dissected from both hindlimbs. Protein content and the relative composition of Type II fibers in aged soleus were lower than those in young muscle. In aged soleus, higher baseline expression levels of HSP25, HSP72, and cathepsin L were observed compared with those in young muscle (p < 0.05). However, there were no significant differences in the expression levels of phosphorylated p70 S6 kinase (p-p70S6K), calpain 1, and calpain 2 of soleus between two age groups. A significant increase in muscle mass of both age groups was induced by heat stress (p < 0.05). Heat stress also upregulated the expressions of HSP25, HSP72, and p-p70S6K in both ages (p < 0.05). On the other hand, a significant decrease in cathepsin L expression by heating was observed in aged soleus, but not in young (p < 0.05). Both the percentage of Type I fibers and the expression of calpains in both age groups were unchanged following heat stress. Heat stress-associated downregulation of cathepsin L may be attributed to the upregulation of HSP72, which stabilizes lysosomal membranes (p < 0.05). Upregulations of HSP25, HSP72, and p-p70S6K and/or the downregulation of cathepsin L may play a role in heat stress-associated muscle hypertrophy in aged soleus muscle.
Starting Page	45
Ending Page	53
Page Count	9
File Format	PDF
ISSN	03008177
Journal	Molecular and Cellular Biochemistry
Volume Number	369
Issue Number	1-2
e-ISSN	15734919
Language	English
Publisher	Springer US
Publisher Date	2012-06-24
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Skeletal muscle Heat stress Aging Heat shock proteins Lysosomal enzyme Cardiology Oncology Medical Biochemistry Biochemistry
Content Type	Text
Resource Type	Article
Subject	Cell Biology Medicine Clinical Biochemistry Molecular Biology

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