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Am J Physiol Regul Integr Comp Physiol 292: R827-R836, 2007. First published October 12, 2006; doi:10.1152/ajpregu.00379.2006 Free Article
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Sex Differences in Renal and Cardiovascular Function: Physiology and Pathophysiology

Sex differences in energy metabolism and performance of teleost cardiac tissue

Pavan K. Battiprolu, Kelli J. Harmon, and Kenneth J. Rodnick

Department of Biological Sciences, Idaho State University, Pocatello, Idaho

Submitted 1 June 2006 ; accepted in final form 4 October 2006

This study examined the effects of different oxygenation levels and substrate availability on cardiac performance, metabolism, and biochemistry in sexually immature male and female rainbow trout (Oncorhynchus mykiss). Ventricle strips were electrically paced (0.5 Hz, 14°C) in hyperoxic or hypoxic Ringer solution. Our results demonstrate that 1) males sustain isometric force production (F) longer than females under hyperoxia (PO2 = 640 mmHg) with exogenous glucose present; 2) contractility is not maintained under moderate (PO2 = 130 mmHg) or severe hypoxia (PO2 = 10–20 mmHg) with glucose in either sex; however, following reoxygenation, F is higher in females compared with males; and 3) female tissue has higher lactate levels, net lactate efflux, and lactate dehydrogenase activity than males, whereas males have higher glycogen, citrate synthase, and beta-hydroxy acyl-CoA dehydrogenase activities, and greater inotropic responses to exogenous glucose and octanoate. No sex differences were detected in responsiveness to epinephrine and inhibitors of glucose transport or activities of hexokinase and pyruvate kinase. We conclude that sex differences exist in rainbow trout cardiac tissue: females appear to prefer glycolysis for ATP production, whereas males have a higher capacity for aerobic and lipid metabolism.

glucose; glycogen; lactate; oxygenation; rainbow trout


Address for reprint requests and other correspondence: K. J. Rodnick, Dept. of Biological Sciences, Idaho State Univ., Pocatello, ID 83209–8007 (e-mail: rodnkenn{at}isu.edu)




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 Am. J. Physiol. Regul. Integr. Comp. Physiol.Home page
K. Denton and C. Baylis
Physiological and molecular mechanisms governing sexual dimorphism of kidney, cardiac, and vascular function
Am J Physiol Regulatory Integrative Comp Physiol, February 1, 2007; 292(2): R697 - R699.
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