Abstract
Taurine is a non-proteinogenic sulfonic acid found in high concentrations inside vertebrate cardiomyocytes and its movement across the sarcolemmal membrane is critical for cell volume regulation. Taurine deficiency is rare in mammals, where it impairs cardiac contractility and leads to congestive heart failure. In fish, cardiac taurine levels vary substantially between species and can decrease by up to 60% in response to environmental change but its contribution to cardiac function is understudied. We addressed this gap in knowledge by generating a taurine-deficient rainbow trout (Oncorhynchus mykiss) model using a feed enriched with 3% β-alanine to inhibit cellular taurine uptake. Cardiac taurine was reduced by 17% after 4 weeks with no effect on growth or condition factor. Taurine deficiency did not affect routine or maximum rates of O2 consumption, aerobic scope, or critical swimming speed in whole animals but cardiac contractility was significantly impaired. In isometrically contracting ventricular strip preparations, the force–frequency and extracellular Ca2+-sensitivity relationships were both shifted downward and maximum pacing frequency was significantly lower in β-alanine fed trout. Cardiac taurine deficiency reduces sarcoplasmic reticular Ca2+-ATPase activity in mammals and our results are consistent with such an effect in rainbow trout. Our data indicate that intracellular taurine contributes to the regulation of cardiac contractility in rainbow trout. Aerobic performance was unaffected in β-alanine-fed animals, but further study is needed to determine if more significant natural reductions in taurine may constrain performance under certain environmental conditions.
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Acknowledgements
We would like to thank Dr. Jim Duston, Ms. Audrie-Jo McConkey, Ms. Jamie Fraser, and Mr. Kare Tonning for considerable technical assistance with the preparation of the experimental feed and completion of the initial feeding trial. We also thank Mr. Wayne Anderson for animal husbandry assistance.
Funding
MAG was supported by a Natural Sciences and Engineering Research Council of Canada (NSERC) undergraduate student research assistantship. AJM, SGL, and TJM were supported by NSERC Discovery Grants.
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Gates, M.A., Morash, A.J., Lamarre, S.G. et al. Intracellular taurine deficiency impairs cardiac contractility in rainbow trout (Oncorhynchus mykiss) without affecting aerobic performance. J Comp Physiol B 192, 49–60 (2022). https://doi.org/10.1007/s00360-021-01407-4
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DOI: https://doi.org/10.1007/s00360-021-01407-4