Motility initiation of sterlet sturgeon (Acipenser ruthenus) spermatozoa: Describing the propagation of the first flagellar waves.
Identifieur interne : 000121 ( Main/Exploration ); précédent : 000120; suivant : 000122Motility initiation of sterlet sturgeon (Acipenser ruthenus) spermatozoa: Describing the propagation of the first flagellar waves.
Auteurs : Galina Prokopchuk [République tchèque] ; Boris Dzyuba [République tchèque] ; Olga Bondarenko [République tchèque] ; Marek Rodina [République tchèque] ; Jacky Cosson [République tchèque]Source :
- Theriogenology [ 1879-3231 ] ; 2015.
English descriptors
- KwdEn :
- MESH :
- cytology : Spermatozoa.
- physiology : Fishes, Flagella, Spermatozoa.
- Animals, Aquaculture, Male, Sperm Motility.
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 wave propagation generating an active forward displacement similar to that occurring during regular steady state motility (several seconds after activation). Starting from the earliest stages of motility initiation, the wave propagation along the flagellum and formation of new waves proceeded in a helical manner leading to a 3-dimensional rotation of the whole spermatozoon. Eventually, we estimated that the time period needed from the activation signal (contact with fresh water) to full wave propagation ranges from 0.4 to 1.2 seconds.
DOI: 10.1016/j.theriogenology.2015.02.011
PubMed: 25794841
Affiliations:
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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 wave propagation generating an active forward displacement similar to that occurring during regular steady state motility (several seconds after activation). Starting from the earliest stages of motility initiation, the wave propagation along the flagellum and formation of new waves proceeded in a helical manner leading to a 3-dimensional rotation of the whole spermatozoon. Eventually, we estimated that the time period needed from the activation signal (contact with fresh water) to full wave propagation ranges from 0.4 to 1.2 seconds.</div></front></TEI><affiliations><list><country><li>République tchèque</li></country></list><tree><country name="République tchèque"><noRegion><name sortKey="Prokopchuk, Galina" sort="Prokopchuk, Galina" uniqKey="Prokopchuk G" first="Galina" last="Prokopchuk">Galina Prokopchuk</name></noRegion><name sortKey="Bondarenko, Olga" sort="Bondarenko, Olga" uniqKey="Bondarenko O" first="Olga" last="Bondarenko">Olga Bondarenko</name><name sortKey="Cosson, Jacky" sort="Cosson, Jacky" uniqKey="Cosson J" first="Jacky" last="Cosson">Jacky Cosson</name><name sortKey="Dzyuba, Boris" sort="Dzyuba, Boris" uniqKey="Dzyuba B" first="Boris" last="Dzyuba">Boris Dzyuba</name><name sortKey="Rodina, Marek" sort="Rodina, Marek" uniqKey="Rodina M" first="Marek" last="Rodina">Marek Rodina</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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