Activation of Respiration and Initiation of Motility in Rainbow Trout Spermatozoa : Physiology

概要

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It is well established that sperm motility of rainbow trout is initiated by the decrease in K^+ concentration surrounding sperm which triggers the intracellular cAMP-dependent initiation process. Present study showed that K^+ did not affect sperm respiration but inhibited flagellar movement and thus suggested that K^+ regulates sperm motility through its effect on flagellum. On the other hand, inhibitors of respiratory chain or uncoupler of oxidative phosphorylation affected sperm respiration and inhibited sperm motility, suggesting that energy producing system at mitochondria contributes to sperm motility. Motility was initiated even if O_2 was eliminated from dilution medium, although CO_2 suppressed both respiration and motility. This result suggested that sperm motility is not O_2-limited but CO_2 is responsible for the regulation of sperm motility through the activation of respiration. It is likely that regardless of K^+ -dependent cAMP system at sperm flagella, there is another system at mitochondria: enhancement of respiration by the release from CO_2 suppression at spawning may relate to the initiation of sperm motility in rainbow trout.
社団法人日本動物学会の論文
1988-10-15