Behavioral Mechanism during Human Sperm Chemotaxis: Involvement of Hyperactivation
نویسندگان
چکیده
منابع مشابه
Behavioral Mechanism during Human Sperm Chemotaxis: Involvement of Hyperactivation
When mammalian spermatozoa become capacitated they acquire, among other activities, chemotactic responsiveness and the ability to exhibit occasional events of hyperactivated motility--a vigorous motility type with large amplitudes of head displacement. Although a number of roles have been proposed for this type of motility, its function is still obscure. Here we provide evidence suggesting that...
متن کاملBehavioral mechanism of human sperm in thermotaxis: a role for hyperactivation.
STUDY QUESTION What is the behavioral mechanism underlying the response of human spermatozoa to a temperature gradient in thermotaxis? SUMMARY ANSWER Human spermatozoa swim up a temperature gradient by modulating their speed and frequencies of hyperactivation events and turns. WHAT IS KNOWN ALREADY Capacitated human spermatozoa are capable of thermotactically responding to a temperature gra...
متن کاملMolecular Mechanism for Human Sperm Chemotaxis Mediated by Progesterone
Sperm chemotaxis is a chemical guiding mechanism that may orient spermatozoa to the egg surface. A picomolar concentration gradient of Progesterone (P), the main steroidal component secreted by the cumulus cells that surround the egg, attracts human spermatozoa. In order to elucidate the molecular mechanism of sperm chemotaxis mediated by P, we combine the application of different strategies: p...
متن کاملMathematical modeling of calcium signaling during sperm hyperactivation.
Mammalian sperm must hyperactivate in order to fertilize oocytes. Hyperactivation is characterized by highly asymmetrical flagellar bending. It serves to move sperm out of the oviductal reservoir and to penetrate viscoelastic fluids, such as the cumulus matrix. It is absolutely required for sperm penetration of the oocyte zona pellucida. In order for sperm to hyperactivate, cytoplasmic Ca(2+) l...
متن کاملControl of hyperactivation in sperm.
BACKGROUND Sperm hyperactivation is critical to fertilization, because it is required for penetration of the zona pellucida. Hyperactivation may also facilitate release of sperm from the oviductal storage reservoir and may propel sperm through mucus in the oviductal lumen and the matrix of the cumulus oophorus. Hyperactivation is characterized by high amplitude, asymmetrical flagellar bending. ...
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ژورنال
عنوان ژورنال: PLoS ONE
سال: 2011
ISSN: 1932-6203
DOI: 10.1371/journal.pone.0028359