Motility initiation of sterlet sturgeon (Acipenser ruthenus) spermatozoa: Describing the propagation of the first flagellar waves

Theriogenology
Galina ProkopchukJacky Cosson

Abstract

In the present study, for the first time in fish spermatozoa, we describe the precise chronology of motility initiation of sterlet (sturgeon) sperm from completely immotile flagella to regular full wave propagation. The successive activation steps were investigated by high-speed video microscopy, using specific experimental situation, where sperm motility initiation was delayed in time up to several seconds (10 ± 2.68 seconds). Starting from fully immotile, the flagellum shows some trembling for a brief period, soon followed by appearance of the first real bend (so-called "principal bend") with a large wave amplitude 4.28 ± 0.65 μm, then by the "reverse bend," the latter presenting a lower (P < 0.05) wave amplitude (1.14 ± 0.32 μm). This couple of first bends formed at the basal region begins to propagate toward the flagellar tip but gradually fades when reaching the midflagellum, wherein consequently the sperm cell remains nonprogressive. This behavior repeats several times until a stage where the amplitude of the reverse bend gradually reaches a value similar that of the principal bend: The larger amplitude of this couple of bends finally leads to sustain a real "takeoff" of the sperm cell characterized by a full flagellar wa...Continue Reading

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Citations

Dec 4, 2015·Animal Reproduction Science·Galina ProkopchukJacky Cosson
Apr 14, 2018·Reproduction, Fertility, and Development·Sergii BoryshpoletsBorys Dzyuba
Jun 16, 2017·The Journal of Experimental Biology·Ian A E ButtsTrevor E Pitcher
Oct 22, 2020·Fish Physiology and Biochemistry·Jacky Cosson
Jul 3, 2019·Theriogenology·Sayyed Mohammad Hadi AlaviOtomar Linhart
Jun 3, 2021·Fish Physiology and Biochemistry·Fabio HerreraSergii Boryshpolets

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