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Investigations on the Motility of Human Spermatozoa in a Defined Medium in the Presence of Metabolic Inhibitors and of Carnitine

Summary:  When washed human sperm were incubated in a modified Krebs‐Ringer buffer solution in the absence of exogenous metabolizable substrates at 30° C they maintained progressive motility for at least six hours. Under these conditions the spermatozoa apparently utilize endogenous substrates but addition of exogenous substrates (glucose, fructose, acetate, short‐chain fatty acids, branched chain amino acids) did not affect the % progressive motility or % total motility of the cells. The phospholipase inhibitors, quin‐acrine and Upjohn No. 1002, inhibited progressive motility when added to sperm utilizing endogenous substrate, and subsequent addition of oxidative or glycolytic substrates did not reverse the inhibition. In contrast, the inhibition by KCN of progressive motility based upon utilization of endogenous substrate was reversed upon addition of glycolyzable compounds (glucose or fructose).