The Journal of Physiological Sciences
Online ISSN : 1880-6562
Print ISSN : 1880-6546
ISSN-L : 1880-6546
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Gene Expression Levels of Heat Shock Proteins in the Soleus and Plantaris Muscles of Rats after Hindlimb Suspension or Spaceflight
Akihiko IshiharaHidemi FujinoFumiko NagatomoIsao TakedaYoshinobu Ohira
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2008 Volume 58 Issue 6 Pages 413-417

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Abstract
Gene expression levels of heat shock proteins (HSPs) in the slow-twitch soleus and fast-twitch plantaris muscles of rats were determined after hindlimb suspension or spaceflight. Male rats were hindlimb-suspended for 14 d or exposed to microgravity for 9 d. The mRNA expression levels of HSP27, HSP70, and HSP84 in the hindlimb-suspended and microgravity-exposed groups were compared with those in the controls. The mRNA expression levels of the 3 HSPs in the soleus muscle under normal conditions were higher compared with those in the plantaris muscle. The mRNA expression levels of the 3 HSPs in the soleus muscle were inhibited by hindlimb suspension and spaceflight. The mRNA expression levels of the 3 HSPs in the plantaris muscle did not change after hindlimb suspension. It is suggested that the mRNA expression levels of the 3 HSPs are regulated by the mechanical and neural activity levels, and therefore the decreased mRNA expression levels of HSPs in the slow-twitch muscle following hindlimb suspension and spaceflight are related to a reduction in the mechanical and neural activity levels.
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© 2008 by The Physiological Society of Japan
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