Cellular distribution of Hsp70 expression in rat skeletal muscles. Effects of moderate exercise training and chronic hypoxia |
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| Authors: | Elena Tarricone Cristina Scapin Maurizio Vitadello Fabio Esposito Vittoria Margonato Giuseppina Milano Michele Samaja Luisa Gorza |
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| Institution: | Department of Biomedical Sciences, University of Padova, Padova, Italy. |
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| Abstract: | Rat hindlimb muscles constitutively express the inducible heat shock protein 72 (Hsp70), apparently in proportion to the slow myosin content. Since it remains controversial whether chronic Hsp70 expression reflects the overimposed stress, we investigated Hsp70 cellular distribution in fast muscles of the posterior rat hindlimb after (1) mild exercise training (up to 30 m/min treadmill run for 1 h/day), which induces a remodeling in fast fiber composition, or (2) prolonged exposure to normobaric hypoxia (10%O2), which does not affect fiber-type composition. Both conditions increased significantly protein Hsp70 levels in the skeletal muscle. Immunohistochemistry showed the labeling for Hsp70 in subsets of both slow/type 1 and fast/type 2A myofibers of control, sedentary, and normoxic rats. Endurance training increased about threefold the percentage of Hsp70-positive myofibers (P | |
| Keywords: | Exercise HO-1 HSP70 Hypoxia Skeletal muscle |
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