Results 1 to 10 of about 9,958 (250)
Flagellar hyperactivation of bull and boar spermatozoa [PDF]
Reproductive Medicine and Biology, 2018 Background In mammals, flagellar hyperactivation is indispensable to sperm fertilization with oocytes in vivo, although there are species differences in regulatory mechanisms for this event.
Hiroshi Harayama
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Energy Metabolism and Hyperactivation of Spermatozoa from Three Mouse Species under Capacitating Conditions [PDF]
Cells, 2022 Mammalian sperm differ widely in sperm morphology, and several explanations have been presented to account for this diversity. Less is known about variation in sperm physiology and cellular processes that can give sperm cells an advantage when competing ...
Ester Sansegundo +2 more
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Serotonergic signals enhanced hamster sperm hyperactivation
Journal of Reproduction and Development, 2021 In the present study, we investigated the regulatory mechanisms underlying sperm hyperactivation enhanced by 5-hydroxytryptamine (5-HT) in hamsters. First, we examined the types of 5-HT receptors that regulate hyperactivation.
Masakatsu Fujinoki, Satoshi Obayashi
exaly +3 more sources
Enhancement of rat spermatozoal hyperactivation by progesterone
The Journal of Reproduction and Development, 2023 Progesterone (P) is a well-known enhancer of hyperactivation which is associated with the success of in vitro fertilization (IVF). In this study, we examined whether P-enhanced hyperactivation affected IVF success in rats.
Yuki MIYAZAWA, Masakatsu FUJINOKI
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Non‐genomic regulation of mammalian sperm hyperactivation
Reproductive Medicine and Biology, 2009 AbstractAlthough it has been suggested that the acrosome reaction is induced through non‐genomic regulation in a ligand‐dependent manner, it is not known whether hyperactivation is similarly regulated. Progesterone and melatonin have been identified as ligands that regulate hyperactivation, the former through non‐genomic regulation with phospholipase C
Masakatsu Fujinoki
exaly +3 more sources
Frontiers in Cell and Developmental Biology, 2021 To fertilize an egg, mammalian sperm must undergo capacitation in the female genital tract. A key contributor to capacitation is the calcium (Ca2+) channel CatSper, which is activated by membrane depolarization and intracellular alkalinization.
Juan J. Ferreira +5 more
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Heat-Induced Hyperactivation [PDF]
Journal of Assisted Reproduction and Genetics, 1998 The objectives of this study were (1) to determine the sperm hyperactivation and related kinematic parameters at 40 degrees C after using four sperm wash procedures and (2) to correlate the heat-induced hyperactivation data with cases of clinical pregnancies from either artificial insemination or standard in vitro fertilization (IVF).Semen samples (n =
P J, Chan +4 more
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Frontiers in Physiology, 2021 Potassium channels are involved in membrane hyperpolarization and ion homeostasis regulation during human sperm capacitation. However, the types of potassium channels in human sperm remain controversial.
Tian Gao +11 more
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New Approaches to Define The Functional Competency of Human Sperm Subpopulations and Its Relationship to Semen Quality [PDF]
International Journal of Fertility and Sterility, 2022 Background: This study aimed at comparing a comprehensive set of functional and structural sperm characteristics betweensperm motility fractions and correlating results to the standard semen parameters.
Shannen Keyer +2 more
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Frontiers in Cell and Developmental Biology, 2021 To become fully competent to fertilize an egg, mammalian sperm undergo a series of functional changes within the female tract, known as capacitation, that require an adequate supply and management of energy.
María Milagros Giaccagli +6 more
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