Phosphorylation of a Protein and the Initiation of Flagellar Motility in Rainbow Trout Spermatozoa

  • Hiroshi Hayashi
  • Masaaki Morisawa
Part of the Advances in Experimental Medicine and Biology book series (NATO ASI F, volume 231)


In many higher organisms, the life span of an individual commences at the time when two gametes, an egg and a spermatozoon, fuse together. From that very moment, ageing of an individual organism inevitably starts. The drama of reproduction of life has several prologues, for example maturation and spawning of gamates. Concerning the latter event, especially release of sperm cells, it is well known that spermatozoa which are quiescent in the male reproductive organ, start to move when they are released into the spawning ground. At this moment, there must be some means for the sperm cells to detect the change of environment and subsequently to initiate the flagellar motility. This idea has been proposed more than half a century by sir James Gray who described that initiation of motility in sea urchin spermatozoa occurs by the mechanical dilution whereby spawned sperm obtain open space for movement1. Furthermore, a number of investigators tried to find the factor(s) indispensable for the initiation of sperm motility by studying mainly marine invertebrates. Nevertheless, the mechanism underlying the initiation of sperm motility has been obscure.


Sperm Cell Sperm Motility Seminal Plasma Salmonid Fish Male Reproductive Organ 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer Science+Business Media New York 1988

Authors and Affiliations

  • Hiroshi Hayashi
    • 1
    • 2
  • Masaaki Morisawa
    • 1
    • 2
  1. 1.Department of Molecular Biology, School of ScienceNagoya UniversityNagoya 464Japan
  2. 2.Ocean Research InstituteUniversity of TokyoNakano-ku, Tokyo 164Japan

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