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J Appl Physiol 93: 1999-2008, 2002. First published August 23, 2002; doi:10.1152/japplphysiol.00097.2002
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Vol. 93, Issue 6, 1999-2008, December 2002

H2O2 activates ryanodine receptor but has little effect on recovery of releasable Ca2+ content after fatigue

Toshiharu Oba1, Chieko Kurono2, Ritsuko Nakajima3, Tetsuo Takaishi4, Kazuto Ishida5, Geraldine A. Fuller6, Wuthichai Klomkleaw6, and Mamoru Yamaguchi6

1 Departments of Regulatory Cell Physiology, and 2 Morphological Anatomy, Graduate School of Medical Sciences, 3 Nagoya City University School of Nursing, 4 Department of Health Science, Institute of Natural Sciences, Nagoya City University, Nagoya 467-8601; 5 Department of Physical Therapy, Nagoya University School of Health Sciences, Nagoya 461-8673, Japan; and 6 Department of Veterinary Biosciences, College of Veterinary Medicine, The Ohio State University, Columbus, Ohio 43210

We studied whether hydrogen peroxide (H2O2) at <= 10 µM activates the ryanodine receptor and decreases releasable Ca2+ content in the sarcoplasmic reticulum after fatigue. Exposure of rabbit or frog skeletal muscle ryanodine receptors to 10 µM H2O2 enhanced channel activity in lipid bilayers when the redox potential was defined at cis = -220 mV and trans = -180 mV. Channel activation by 10 µM H2O2 was also observed when cis potential was set at -220 mV without defining trans potential, but the effect was less. Reduction of trans redox potential from -180 to -220 mV did not alter channel activity. H2O2 at 500 µM failed to activate the channel when the redox potential was not controlled. Stimulation of the frog muscle fiber for 2 min (50 Hz, a duty cycle of 200 ms/s) decreased tetanus tension by ~50%. After 1 min, tetanus recovered rapidly to ~70% of control and thereafter slowly approached the control level. Amplitudes of caffeine- and 4-chloro-m-cresol-induced contractures were decreased after a 60-min rest. The decrease is not enhanced by exposure to 10 µM H2O2. These results suggest that H2O2 markedly activates the ryanodine receptor under the redox control in vitro, but externally applied H2O2 may not play an important role in the postfatigue recovery process.

redox potential; single-channel current; calcium content in sarcoplasmic reticulum; catalase; hydrogen peroxide


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T. G. Favero, J. Webb, M. Papiez, E. Fisher, R. J. Trippichio, M. Broide, and J. J. Abramson
Hypochlorous acid modifies calcium release channel function from skeletal muscle sarcoplasmic reticulum
J Appl Physiol, April 1, 2003; 94(4): 1387 - 1394.
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