Abstract
Taurine protects against tissue damage in a variety of models involving inflammation, especially the muscle. We set up a heavy exercise bout protocol for rats consisting of climbing ran on a treadmill to examine the effect of an intraabdominal dose of taurine (300 mg/kg/day) administered 1 h before heavy exercise for ten consecutive days. Each group ran on the treadmill at 20 m/min, 25% grade, for 20 min or until exhaustion within 20 min once each 10 days. Exhaustion was the point when an animal was unable to right itself when placed on its side. The muscle damage was associated with an increased accumulation of 8-nitroguanine and 8-OHdG in the nuclei of skeletal muscle cells. The immunoreactivities for NF-κB and iNOS were also increased in the exercise group. Taurine ameliorated heavy exercise-induced muscle DNA damage to a significant extent since it reduced the accumulation of 8-nitroguanine and 8-OHdG, possibly by down-regulating the expression of iNOS through a modulatory action on NF-κB signaling pathway. This study demonstrates for the first time that taurine can protect against intense exercise-induced nitrosative inflammation and ensuing DNA damage in the skeletal muscle of rats by preventing iNOS expression and the nitrosative stress generated by heavy exercise.
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Abbreviations
- ROS:
-
Reactive oxygen species
- O2 − :
-
Superoxide anion
- NF-κB:
-
Nuclear factor kappa-B
- iNOS:
-
Inducible NO synthase
- 8-OHdG:
-
8-Hydroxydeoxyguanosine
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Acknowledgments
This work was supported by Grants-in-Aid for Scientific Research from the Ministry of Education, Science, Sports, and Culture of Japan.
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Sugiura, H. et al. (2013). Protection by Taurine Against INOS-Dependent DNA Damage in Heavily Exercised Skeletal Muscle by Inhibition of the NF-κB Signaling Pathway. In: El Idrissi, A., L'Amoreaux, W. (eds) Taurine 8. Advances in Experimental Medicine and Biology, vol 775. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-6130-2_20
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DOI: https://doi.org/10.1007/978-1-4614-6130-2_20
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