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Articles in PresS, published online ahead of print November 9, 2001
J Appl Physiol, 10.1152/jap.00739.2001
Submitted on July 17, 2001
Accepted on November 5, 2001
1 Muscle Physiology, Kumamoto University, Kumamoto, Japan
2 Neurochemistry, Kyoto University, Kyoto, Japan
3 Health and Sport Science, Osaka University, Osaka, Japan
4 Brain Research, University of California, Los Angeles, Los Angeles, California, USA
* To whom correspondence should be addressed. E-mail: oishi{at}gpo.kumamoto-u.ac.jp.
An original method to induce heat stress was used to clarify the time course of changes in heat shock proteins (HSPs) in rat skeletal muscles during recovery after a single bout of heat stress. One hindlimb was inserted into a stainless steel can and directly heated by raising the air temperature inside the can via a flexible heater twisted around the steel can. Muscle temperature was increased gradually and maintained at 42°C for 60 min. Core rectal and contralateral muscle temperatures were increased <1.5°C during the heat stress. HSP60, HSP72 and heat shock cognate (HSC)73 content in the slow soleus and fast plantaris in both limbs were determined immediately (0) and 2, 4 , 8, 12, 24, 36, 48 or 60 h after heat stress. Within 0 to 4 h, all HSPs were ~1.5- to 2.2-fold higher in the heat stressed than contralateral soleus. Compared to the contralateral plantaris, the heat-stressed plantaris had a higher (1.5-fold) HSP60 content immediately and 2 h and a higher (2.5- to 6.8-fold) HSP72 content between 24 and 48 h after heat stress. Plantaris HSC73 content was not affected by heat stress. This unique heat stress method provides advantages over existing systems: muscle temperature can be controlled precisely during heating and the HSP response can be compared between muscles in heat stressed and contralateral limbs of individual rats. The results show a differential response of HSPs in the soleus and plantaris during recovery after heat stress: soleus demonstrated a more rapid and broader HSP response to heat stress than the plantaris.
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