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- W3156036698 abstract "In mammals, hyperactivation is essential for sperm fertilization with oocytes in vivo. Two types of hyperactivation full-type and nonfull-type patterns can be observed in the spermatozoa from boars, bulls, and mice. We have a hypothesis that the full-type hyperactivation is a physiological (in vivo) pattern and are elucidating its molecular bases. The aims of this study were to detect calmodulin in boar sperm flagella by Western blotting and indirect immunofluorescence and to investigate effects of extracellular Ca2+ and calmodulin antagonists W-7 and W-5 (W-5; a less potent antagonist) on the occurrence of full-type hyperactivation in boar spermatozoa. Calmodulin was specifically detected as the 17-kDa antigen in the flagella and postacrosomal region of the heads. Full-type hyperactivation could be induced effectively in the samples incubated with 3.42 mM CaCl2 for 120-180 min, and it was significantly reduced in the concentration-dependent manners of W-7 and W-5. Suppressing effects of W-7 on the full-type hyperactivation were stronger than those of W-5. These observations indicate that flagellar calmodulin is involved in the occurrence of extracellular Ca2+ -dependent full-type hyperactivation in boar spermatozoa. This is the first indication of the intracellular Ca2+ -sensing molecule which can function in the full-type hyperactivation." @default.
- W3156036698 created "2021-04-26" @default.
- W3156036698 creator A5001104972 @default.
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- W3156036698 date "2021-01-01" @default.
- W3156036698 modified "2023-10-18" @default.
- W3156036698 title "Calmodulin is involved in the occurrence of extracellular Ca 2+ ‐dependent full‐type hyperactivation in boar ejaculated spermatozoa incubated with cyclic AMP analogs" @default.
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- W3156036698 doi "https://doi.org/10.1111/asj.13552" @default.
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