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• W2166579879 abstract "Abstract Digital image analysis of the flagellar movements of cynomolgus macaque spermatozoa hyperactivated by caffeine and cAMP was carried out to understand the change in flagellar movements during hyperactivation. The degree of flagellar bending increased remarkably after hyperactivation, especially at the base of the midpiece. Mainly two beating patterns were seen in the hyperactivated monkey sperm flagella: remarkably asymmetrical flagellar bends of large amplitude and relatively symmetrical flagellar bends of large amplitude. The asymmetrical bends were often seen in the early stage of hyperactivation, whereas the symmetrical bends executed nonprogressive, figure‐of‐eight movement. Beat frequency of the hyperactivated spermatozoa significantly decreased while wavelength of flagellar waves roughly doubled. To determine the conditions under which the axonemes of hyperactivated sperm flagella have asymmetrical or symmetrical bends, the plasma membranes of monkey spermatozoa were extracted with Triton X‐100 and motility was reactivated with MgATP 2− under various conditions. The asymmetrical flagellar bends were brought about by Ca 2+ , whereas the symmetrical flagellar bends resulted from low levels of Ca 2+ and high levels of cAMP. Under these conditions, beat frequency and wavelength of flagellar waves of demembranated, reactivated spermatozoa were similar to those of the hyperactivated spermatozoa. These results suggest that during hyperactivation of monkey spermatozoa intracellular Ca 2+ concentrations first rise, and then decrease while cAMP concentrations increase simultaneously. Mol. Reprod. Dev. 1129–1139, 2006. © 2006 Wiley‐Liss, Inc." @default.
• W2166579879 created "2016-06-24" @default.
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• W2166579879 date "2006-06-29" @default.
• W2166579879 modified "2023-10-16" @default.
• W2166579879 title "Hyperactivation of monkey spermatozoa is triggered by Ca²⁺ and completed by cAMP" @default.
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• W2166579879 doi "https://doi.org/10.1002/mrd.20420" @default.
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