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Use of deuterium oxide (2H2O) to assess muscle protein synthesis in juvenile red drum (Sciaenops ocellatus) fed complete, and valine-deficient diets

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Abstract

The use of 2H2O in tank water to assess protein synthesis rates in fish is a relatively novel methodology that could allow for a better understanding of the effects of particular nutritional and environmental variables on rates of protein accretion. As such, this study involved an assessment and comparison of protein synthesis rates in the muscle of juvenile red drum fed a control diet (nutritionally complete) versus a valine (Val)-deficient diet. Six groups of 12 juvenile red drum, initially weighing ~ 4.5 g/fish, were stocked in six separate 38-L aquaria operating as a recirculating system. Fish were acclimatized to experimental conditions for 2 weeks while being fed the control diet. Just prior to initiating the protein synthesis assay, one aquarium of fish was fed the control diet while a second aquarium of fish was fed the Val-deficient diet. Immediately after consuming the experimental diets, each group of fish was moved to an independent aquarium containing 2H2O, and the fractional synthetic rate (FSR) of protein synthesis was obtained at 12, 24, 36 and 48 h after feeding by collecting two fish per treatment at each time point. This protein synthesis assay procedure was performed in three separate sessions, and considered as replicates over time (n = 3) for fish fed the control or Val-deficient diets immediately before initiating the session. Results indicated that a one-time feeding of a diet deficient in Val significantly reduced protein synthesis rates in the muscle of red drum. In addition, a significant effect of time after feeding was found, where observed FSR values peaked at 12 h after feeding and decreased as time progressed. In conclusion, deuterium methodologies were applicable to red drum, and this approach had the sensitivity to assess differences in protein synthesis rates when dietary perturbations were introduced.

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Acknowledgements

Financial support for this research was provided by Texas A&M AgriLife Research. At the time of this study, Sergio Castillo was a Tom Slick Senior Graduate Fellow at Texas A&M University. The authors gratefully acknowledge the assistance provided by Mr. Alejandro Velasquez for processing the amino acid data for this study, and Mr. Brian Ray for the technical support during the feeding trial.

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Texas A&M AgriLife Research.

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Correspondence to Delbert M. Gatlin III.

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This study was carried out with the compliance of the Institutional Animal Care and Use Committee at Texas A&M University (IACUC 2016–0368).

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Handling editor: N. Le Floc'h.

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Castillo, S., Yamamoto, F.Y., O’Reilly, C. et al. Use of deuterium oxide (2H2O) to assess muscle protein synthesis in juvenile red drum (Sciaenops ocellatus) fed complete, and valine-deficient diets. Amino Acids 53, 1431–1439 (2021). https://doi.org/10.1007/s00726-021-03036-1

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  • DOI: https://doi.org/10.1007/s00726-021-03036-1

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