Abstract
The role of cortisol in the mobilization and metabolism of amino acids following exhaustive exercise in rainbow trout (Onorhynchus mykiss) was investigated. Plasma cortisol levels were elevated for 4h following exercise and 6, of a total of 22 amino acids, showed significant responses. In white muscle, alanine and glutamine were elevated immediately after exercise through to 4h, whereas glutamate, and the branched-chain amino acids (BCAA), isoleucine, leucine and valine, all decreased over this time. In plasma all of these amino acids increased from 2-4h post-exercise, while in liver, alanine and glutamine increased, glutamate did not change and the BCAAs declined over this time. Blockade of the post-exercise elevation in plasma cortisol with either metyrapone (cortisol synthesis inhibitor) or dexamethasone (cortisol release blocker) prevented the changes in tissue amino acid levels. This study demonstrates that cortisol can act rapidly (within minutes to hours) to alter amino acid metabolism in fish. A model is presented to explain the action of cortisol on amino acid metabolism.
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Anderson, D.E., Reid, S.D., Moon, T.W. and Perry, S.F. 1991. Metabolic effects associated with chronically elevated cortisol in rainbow trout (Oncorhynchus mykiss). Can. J. Fish. Aquat. Sci. 48: 1811–1817.
Barton, K.N., Gerrits, M.F. and Ballantyne, J.S. 1995. Effects of exercise on plasma nonesterified fatty acids and free amino acids in Arctic char (Salvelinus alpinus). J. Exp. Zool. 271: 183–189.
Block, K.P., Richmond, W.B., Mehard, W.B. and Buse, M.G. 1987. Glucocorticoid-mediated activation of muscle branched-chain a-keto acid dehydrogenasein vivo. Am. J. Physiol. 252: E396–E407.
Chamberlin, M.E., Glement, H.G. and Ballantyne, J.S. 1991. Glutamine metabolism in a holostean (Amia calva) and teleost fish (Salvelinus alpinus). Am. J. Physiol. 260: R159–R16.
Cohen, S.A and Strydom, D.J. 1988. Amino acid analysis utilizing phenylisothiocyanate derivatives. Anal. Biochem. 174: 1–16.
Eros, S. and Milligan, C.L. 1996. The effect of cortisol on recovery from exhaustive exercise in rainbow trout: potential mechanisms of action. Physiol. Zool. 69: 1196–1214.
Henderson, I.W. and Garland, H.O. 1980. General, Comparative and Clinical Endocrinology of the Adrenal Cortex. Academic Press, London.
Henriksson, J. 1991. Effect of exercise on amino acid concentrations in skeletal muscle and plasma. J. Exp. Biol. 160: 149–166.
Hughes, S.G., Rumsey, G.L. and Nesheim, M.C. 1983. Branched-chain amino acid aminotransferase activity in the tissues of lake trout. Comp. Biochem. Physiol. 76B: 429–431.
MacLean, D.A., Spreit, L.L., Hultman, E. and Graham, T.E. 1991. Plasma and muscle amino acid and ammonia responses during prolonged exercise in humans. J. Appl. Physiol. 70: 2095–2103.
McDonald, D.G. and Milligan, C.L. 1992. Chemical properties of the blood.In Fish Physiology. Vol. 12A, pp. 55–133. Edited by W.S. Hoar, D.J. Randall and A.P. Farrell. Academic Press, San Diego.
Milligan, C.L. 1996. Metabolic recovery from exhaustive exercise in rainbow trout. Comp. Biochem. Physiol. 113A: 51–60.
Milligan, C.L. and Girard, S.G. 1993. Lactate metabolism in rainbow trout. J. Exp. Biol. 180: 175–193.
Milligan, C.L. and Wood, C.M. 1986. Tissue intracellular acid-base status and the fate of lactate after exhaustive exercise in the rainbow trout. J. Exp. Biol. 123: 123–144.
Mommsen, T.P., French, C.J. and Hochachka, P.W. 1980. Sites and patterns of protein and amino acid utilization during the spawning migration of salmon. Can. J. Zool. 58: 1785–1799.
Moon, T.W. and Johnston, I.A. 1981. Amino acid transport and interconversions in tissue of freshly caught and food-deprived plaice,Pleuronectes platessa L. J. Fish Biol. 19: 653–664.
Narayansingh, T. and Eales, J.G. 1975. Effects of thyroid hormones on in vivo 1-14C-L-leucine incorporation into plasma and tissue protein of brook trout (Salvelinus fontinalis) and rainbow trout (Salmo gairdneri). Comp. Biochem. Physiol. 52B: 399–405.
Pagnotta, A., Brooks, L. and Milligan, L. 1994. The potential regulatory role of cortisol in the recovery from exhaustive exercise in rainbow trout. Can. J. Zool. 72: 2136–2146.
Soivio, A., Westman, K. and Nyholm, K. 1972. Improved method of dorsal aorta catheterization haematological effects followed for three weeks in rainbow trout (Salmo gairdneri). Finnish Fish. Res. 1: 11–21.
Storey, K.B. 1991. Metabolic consequences of exercise in organs of the rainbow trout. J. Exp. Zool. 260: 157–164.
van den Thillart, G. 1986. Energy metabolism of swimming trout (Salmo gairdneri). Oxidation rates of palmitate, glucose, lactate, alanine, leucine and glutamate. J. Comp. Physiol. B. 156: 511–520.
van der Boon, J., van den Thillart, G.E.E.J.M. and Addink, A.D.F. 1991. The effects of cortisol administration on intermediary metabolism in teleost fish. Comp. Biochem. Physiol. 100A: 47–53.
van der Boon, J., Eelkema, F.A., van den Thillart, G.E.E.J.M. and Addink, A.D.F. 1992. Influence of anoxia on free amino acid levels in blood, liver and skeletal muscles of the goldfish,Carassius auratus L. Comp. Biochem. Physiol. 101B: 193–198.
van Waarde, A. 1988. Biochemistry of non-protein nitrogenous compounds in fish including the use of amino acids for anaerobic energy production. Comp. Biochem. Physiol. 9B: 207–228.
van Waarde, A. and Kesbeke, F. 1982. Nitrogen metabolism in goldfish,Carassius auratus (L.). Activities of amidases and amide synthetases in goldfish tissues. Comp. Biochem. Physiol. 71B: 599–603.
Vijayan, M.M., Ballantyne, J.S. and Leatherland, J.F. 1991. Cortisol-induced changes in some aspects of the intermediary metabolism ofSalvelinus fontinalis. Gen. Comp. Endocrinol. 82: 476–486.
Wagenmakers, A.J.M., Brookes, J.H., Coakley, J.H., Reilly, T. and Edwards, R.H.T. 1989. Exercise-induced activation of the branched-chain 2-oxo acid dehydrogenase in human muscle. Eur. J. Appl. Physiol. 59: 159–167.
Wagenmakers, A.J.M., Beckers, E.J., Brouns, F., Kuipers, H., Soeters, P.B. van der Vusse, G.J. and Saris, W.H.M. 1991. Carbohydrate supplementation, glycogen depletion and amino acid metabolism during exercise. Am. J. Physiol. 260: E883–E89.
Walton, M.J. and Cowey, C.B. 1982. Aspects of intermediary metabolism in salmonid fish. Comp. Biochem. Physiol. 73B: 59–79.
Wang, Y., Heigenhauser, G.J.F. and Wood, C.M. 1994. Integrated responses to exhaustive exercise and recovery in rainbow trout white muscle: acid-base, phosphogen, carbohydrate, lipid, ammonia, fluid volume and electrolyte metabolism. J. Exp. Biol. 195: 227–258.
Wood, C.M. 1993. Ammonia and urea metabolism and excretion.In The Physiology of Fishes. pp. 379–425. Edited by D.H. Evans. CRC Press, Boca Raton.
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Milligan, C.L. The role of cortisol in amino acid mobilization and metabolism following exhaustive exercise in rainbow trout (Oncorhynchus mykiss Walbaum). Fish Physiol Biochem 16, 119–128 (1997). https://doi.org/10.1007/BF00004669
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DOI: https://doi.org/10.1007/BF00004669