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Potential for non-shivering thermogenesis in perfused chicken (Gallus domesticus) muscle

Citation

Eldershaw, TPD and Duchamp, C and Clark, MG and Colquhoun, EQ, Potential for non-shivering thermogenesis in perfused chicken (Gallus domesticus) muscle , Comparative Biochemistry and Physiology. A: Comparative Physiology, 117, (4) pp. 545-554. ISSN 0300-9629 (1997) [Refereed Article]

DOI: doi:10.1016/S0300-9629(96)00401-X

Abstract

The humoral modulation of resting muscle heat production of chickens (Gallus domesticus) was investigated in vitro. The resting distal lower limb was perfused via the popliteal artery at 25°C without erythrocytes at constant flow. The preparation was stable for at least 3 hr, showing a constant oxygen uptake (MO2) and perfusion pressure as well as adequately maintaining muscle energy charge and creatine phosphate:creatine ratio. Noradrenaline (NOR), adrenaline (ADR) and serotonin (5-HT) each caused a dose-dependent rise in perfusion pressure. NOR and ADR evoked increased MO2 at low doses eventually followed by decreased MO2 at higher agonist concentrations. 5-HT gave smaller but qualitatively similar MO2 effects. The actions of 50 nM NOR were blocked by prazosin (10 μM) and nitroprusside (0.5 mM), but not altered by propranolol (10 μM). NOR-induced stimulatory MO2 changes in the presence of pharmacological concentrations (1 μM) of glucagon were more pronounced and the thermogenic concentration range of NOR was increased. Taken together, these in vitro findings demonstrate a potential for vasoconstrictor-controlled muscle nonshivering thermogenesis in birds as in marsupials and mammals, suggesting that vascular control of muscle MO2 may be a widespread biological mechanism. The possible implications of these findings for avian nonshivering thermogenesis are discussed.

Item Details

Item Type:Refereed Article
Research Division:Medical and Health Sciences
Research Group:Medical Physiology
Research Field:Systems Physiology
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Environmental Sciences
Author:Clark, MG (Professor Michael Clark)
Author:Colquhoun, EQ (Dr Eric Colquhoun)
ID Code:11257
Year Published:1997
Web of Science® Times Cited:21
Deposited By:Biochemistry
Deposited On:1997-08-01
Last Modified:2011-08-12
Downloads:0

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