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Effects of long-term taurine supplementation on age-related changes in skeletal muscle function of Sprague–Dawley rats

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Abstract

Taurine (2-aminoethanesulfonic acid) is a free amino acid found abundantly in mammalian tissues. Increasing evidence suggests that taurine plays a role in the maintenance of skeletal muscle function and increase of exercise capacity. Most energy drinks contain this amino acid; however, there is insufficient research on the effects of long-term, low-dose supplementation of taurine. In this study, we investigated the effects of long-term administration of taurine at low doses on aging in rodents. In Experiment 1, we examined age-related changes in aging Sprague–Dawley (SD) rats (32–92 weeks old) that O2 consumption and spontaneous activity decreased significantly with aging. In Experiment 2, we examined the effects of long-term (21-week) administration of taurine on healthy aging SD rats. SD rats were stabilized for 32–34 weeks and divided into three groups, administrated water (control), 0.5% taurine (25 mg/kg  body weight (BW)/day), or 1% taurine (50 mg/kg  BW/day) from age 34 to 56 weeks (5 days/week, 5 mL/kg BW). Our findings suggest that long-term administration of taurine at relatively low dose could attenuate the age-related decline in O2 consumption and spontaneous locomotor activity. Upon intestinal absorption, taurine might modulate age-related changes in respiratory metabolism and skeletal muscle function via peroxisome proliferator-activated receptor gamma coactivator 1-alpha (PGC-1α), succinate dehydrogenase (SDH), cytochrome c (Cycs), myocyte enhancer factor 2A (MEF2A), glucose transporter 4 (GLUT4), and myoglobin, which are regulated by the activation of AMP-activated protein kinase (AMPK). This article examines the mechanism underlying the effects of taurine on age-related changes, which may have potential clinical implications.

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Acknowledgements

We would like to thank all members of the present study group for their ideas, suggestions, participation and support. This work was supported by TOKUBETSU KENKYUHI of Okayama Prefectural University.

Funding

This work was supported by TOKUBETSU KENKYUHI of Okayama Prefectural University.

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YM, BS, HM, CI, and HY conceived, designed, and performed the experiments; YM, BS, HM, and HY analyzed the data; HY organized the funding. YM, HM, and HY wrote the paper.

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Correspondence to Hiromi Yamashita.

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The authors declare that they have no conflict of interest.

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All animal experiments were conducted in accordance with the guidelines of Okayama Prefectural University and the laws and notifications of the Japanese government. All animal experiments were approved by the Animal Care and Use Committee of Okayama Prefectural University (protocol number 31-5).

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Ma, Y., Maruta, H., Sun, B. et al. Effects of long-term taurine supplementation on age-related changes in skeletal muscle function of Sprague–Dawley rats. Amino Acids 53, 159–170 (2021). https://doi.org/10.1007/s00726-020-02934-0

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  • DOI: https://doi.org/10.1007/s00726-020-02934-0

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