capacitation


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Related to capacitation: Acrosome reaction

capacitation

 [kah-pas″ĭta´shun]
the process by which the glycoprotein coat and the seminal proteins are removed from the surface of the sperm's acrosome by substances secreted by the uterus or fallopian tubes of the female genital tract, thereby permitting the acrosome reaction to occur.

ca·pac·i·ta·tion

(kă-pas'i-tā'shŭn),
Capacitation is a process whereby the glycoprotein coat is modified and seminal proteins are removed from the surface of the sperm. There are no morphologic changes. Capacitation also occurs in in vitro fertilization; after capacitation, the acrosomal reaction can occur.
[L. capacitas, fr. capax, capable of]

capacitation

/ca·pac·i·ta·tion/ (kah-pas″ĭ-ta´shun) the process by which spermatozoa in the ampullary portion of a uterine tube become capable of going through the acrosome reaction and fertilizing an oocyte.

capacitation

[kəpas′itā′shən]
the process in which the spermatozoon, after it reaches the ampulla of the fallopian tube, undergoes a series of changes that lead to its ability to fertilize an ovum.

capacitation

A biochemical event in mammals that consists of the post-ejaculation maturation of sperm, which are capable of penetrating the zona pellucida and fertilising an oocyte. Capacitation is due to exposure to secretions—sterol binding albumin, lipoproteins, proteases and glycosidases—in the uterus, and requires the correct concentration of the tripeptide fertilisation promoting peptide, which is present in seminal fluid. Capacitation destabilises the acrosomal sperm-head membrane, facilitating binding of a sperm to the oocyte by removing steroids (e.g., cholesterol) and non-covalently bound seminal glycoprotein; the process is reversible and includes all of the events up to the acrosome reaction, which is irreversible.

capacitation

Reproductive medicine The postrelease maturation in sperm, which are capable of penetrating the zona pellucida and fertilizing an oocyte after exposure to secretions in the ♀ genital tract. Cf Acrosome reaction.

ca·pac·i·ta·tion

(kă-pas'i-tā'shŭn)
A conditioning process whereby the glycoprotein coat and seminal proteins are removed from the acrosome of a sperm. After capacitation has occurred, perforations develop in the acrosome.
[L. capacitas, fr. capax, capable of]

capacitation

changes occurring in SPERM while inside the female reproductive tract, where the acidic environment causes alterations to the cell membrane of the sperm that make possible its adhesion to the secondary OOCYTE.

capacitation

the physiological changes the spermatozoa must undergo in the female tract or in vitro before being capable of penetrating the ovum.
References in periodicals archive ?
The percentage of motility, live, intact plasma membrane, capacitation and acrosome reaction of spermatozoa after treatment:
Cholesterol and zinc usually stabilize sperm cell membrane and must be removed during capacitation to enable acrosomal reaction and penetration of the ova.
The videos, as Puar reads them, address their imagined audience with a kind of offer: Open yourself to the wide embrace of neoliberal capacitation and the scenes of debility in which you find yourself will indeed get better.
In order for fertilization to occur, the spermatozoa must first undergo capacitation in which the protective plasma coating covering the spermatozoa surface molecules is removed to allow sperm to be able to bind to the oocyte.
Conditions influencing human sperm capacitation and penetration of zona-free hamster ova.
Much has been done to understand capacitation, but with the tools that we have within the lab we can now identify how specific sites on individual proteins are modified during this process.
La mobilisation des forces politiques, qui seront a meme de promouvoir le developpement integre, est basee sur la capacitation des citoyens demunis des biens materiels essentiels, des droits sociaux et politiques.
Taken within 72 hours of unprotected sex, EC can inhibit ovulation; inhibit the migration of the sperm into the fallopian tube, where fertilization usually occurs; or interfere with sperm capacitation, the process by which sperm becomes capable of fertilizing an egg.
The directive states, "If, after appropriate testing, there is no evidence that conception has occurred already, she may be treated with medications that would prevent ovulation, sperm capacitation or fertilization.
1986), The true value of lambder would appear to be zero: An essay on career criminals, criminal careers, selective in capacitation, and related topics.
Sperm cell capacitation, which involves shedding the outer layer of the sperm head, can be accomplished in vitro during the washing and incubation period.
Antioxidant-prooxidant balance in boar semen is an important regulator of many physiological processes, including sperm attachment to oviductal epithelial cells, capacitation and hyperactivation, binding to the oocyte zona pellucida, acrosome reaction, penetration of the zona, and fusing with and penetrate the oolemma (Bailey et al.