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Gamete Biology |
Department of Life Sciences, Graduate School of Arts and Sciences, University of Tokyo, Meguro-ku, Tokyo 153-8902, Japan
The mammalian sperm must be highly motile for a long time to fertilize a egg. It has been supposed that ATP required for sperm flagellar movement depends predominantly on mitochondrial respiration. We assessed the contribution of mitochondrial respiration to mouse sperm motility. Mouse sperm maintained vigorous motility with high beat frequency in an appropriate solution including a substrate such as glucose. The active sperm contained a large amount of ATP. When carbonyl cyanide m-chlorophenylhydrazone (CCCP) was applied to suppress the oxidative phosphorylation in mitochondria, the vigorous motility was maintained and the amount of ATP was kept at the equivalent level to that without CCCP. When pyruvate or lactate was provided instead of glucose, both sperm motility and the amount of ATP were high. However, they were drastically decreased when oxidative phosphorylation was suppressed by addition of CCCP. We also found that sperm motility could not be maintained in the presence of respiratory substrates when glycolysis was suppressed. 2-Deoxy-D-glucose (DOG) had no effect on mitochondrial respiration assessed by a fluorescent probe, 5,5',6,6'-tetrachloro-1,1',3,3'-tetraethylbenzimidazolylcarbocyanine iodide (JC-1), but, it inhibited motility and decreased ATP content when pyruvate or lactate were provided as substrates. The present results suggest that glycolysis has an unexpectedly important role in providing the ATP required for sperm motility throughout the length of the sperm flagellum.
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