The ability of whale haploid spermatogenic cells to induce calcium oscillations and its relevance to oocyte activation.
Zygote
; 15(2): 103-8, 2007 May.
Article
in En
| MEDLINE
| ID: mdl-17462102
ABSTRACT
Interspecies microinsemination assay was applied to examine the ability of minke whale haploid spermatogenic cells to induce Ca2+ oscillations and oocyte activation. Populations of round spermatids (RS), early-stage elongating spermatids (e-ES), late-stage elongating spermatids (1-ES) and testicular spermatozoa (TS) were cryopreserved in the presence of 7.5% glycerol on board ship in the Antarctic Ocean. Repetitive increases of intracellular Ca2+ concentration occurred in 0, 65, 81 and 96% of BDF1 mouse oocytes injected with the postthaw RS, e-ES, 1-ES and TS, respectively. A normal pattern of the Ca2+ oscillations was observed in 26-47% of the responding oocytes. Most oocytes that exhibited Ca2+ oscillations, regardless of the oscillation pattern, resumed meiosis (83-94%). These results indicate that whale spermatogenic cells acquire SOAF activity, which is closely related to their Ca2+ oscillation-inducing ability at the relatively early stage of spermiogenesis.
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Collection:
01-internacional
Database:
MEDLINE
Main subject:
Oocytes
/
Spermatids
/
Spermatozoa
/
Calcium Signaling
/
Haploidy
Limits:
Animals
Language:
En
Journal:
Zygote
Journal subject:
EMBRIOLOGIA
Year:
2007
Document type:
Article
Affiliation country:
Japan