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First published online June 29, 2006
Journal of Experimental Biology 209, 2678-2685 (2006)
Published by The Company of Biologists 2006
doi: 10.1242/jeb.02317
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Mitochondrial proton leak rates in the slow, oxidative myotomal muscle and liver of the endothermic shortfin mako shark (Isurus oxyrinchus) and the ectothermic blue shark (Prionace glauca) and leopard shark (Triakis semifasciata)

Cindy A. Duong1, Chugey A. Sepulveda2,*, Jeffrey B. Graham2 and Kathryn A. Dickson1,{dagger}

1 Department of Biological Science, California State University Fullerton, Fullerton, CA 92834, USA
2 Marine Biology Research Division and Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California, San Diego, La Jolla, CA 92093-0204, USA


Figure 1
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  		Fig. 1. Mean proton leak rates (± s.e.m.) at 20°C as a function of membrane potential (± s.e.m.) for mitochondria isolated from the slow, oxidative (red) locomotor muscle of three shark species: shortfin mako (N=5), blue (N=4) and leopard (N=5) sharks. Proton leak rates were calculated by assuming the H+:O ratio of 6 when using succinate as the respiratory substrate. Proton leak rates at 160 mV in red muscle mitochondria did not differ significantly among the three species (ANOVA, P=0.313).

 

Figure 2
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  		Fig. 2. Average proton leak rates (± s.e.m.) at 20°C as a function of membrane potential (± s.e.m.) for liver mitochondria from three shark species: shortfin mako (N=5), blue (N=4) and leopard (N=5) sharks. Proton leak rates at 160 mV in red muscle mitochondria did not differ significantly among the three species (ANOVA, P=0.161).

 

Figure 3
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  		Fig. 3. Proton leak curves at 20°C in red muscle and liver mitochondria of the shortfin mako shark (A), blue shark (B) and leopard shark (C). Each data point represents the mean (± s.e.m.) of all individuals sampled for that species. The red muscle curve is higher than the liver curve in all three shark species, but only in the blue shark were the proton leak rates at 160 mV significantly different (paired t-test; P=0.86 for mako shark, 0.02 for blue shark and 0.07 for leopard shark).

 




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