Abstract
In swim-up-selected spermatozoa of 38 normozoospermic patients, capacitated spermatozoa exhibited enhanced pentose phosphate pathway (PPP) activity and increased expression of glucose-6-phosphate dehydrogenase (G6PD). The G6PD inhibitor DHEA and the inhibitors of NADPH oxidase apocynin and diphenylene iodonium (DPI) prevented both superoxide generation and capacitation in human spermatozoa, but whereas DPI and DHEA inhibited PPP, apocynin did not influence it, suggesting that PPP activation during capacitation is not a response to increased oxidative stress but exerts a role by supplying reducing equivalents to oxygen.
Copyright 2010 American Society for Reproductive Medicine. Published by Elsevier Inc. All rights reserved.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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Acetophenones / pharmacology
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Enzyme Inhibitors / pharmacology
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Gene Expression Regulation, Enzymologic
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Glucose-6-Phosphate / metabolism
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Glucosephosphate Dehydrogenase / genetics
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Glucosephosphate Dehydrogenase / metabolism
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Humans
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Male
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NADPH Oxidases / antagonists & inhibitors
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NADPH Oxidases / metabolism
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Onium Compounds / pharmacology
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Pentose Phosphate Pathway / drug effects
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Pentose Phosphate Pathway / genetics
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Pentose Phosphate Pathway / physiology*
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Semen Analysis
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Sperm Capacitation / drug effects
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Sperm Capacitation / genetics
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Sperm Capacitation / physiology*
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Spermatozoa / drug effects
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Spermatozoa / metabolism*
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Spermatozoa / physiology
Substances
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Acetophenones
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Enzyme Inhibitors
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Onium Compounds
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Glucose-6-Phosphate
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diphenyleneiodonium
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acetovanillone
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Glucosephosphate Dehydrogenase
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NADPH Oxidases