acrosomal reaction


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acrosomal reaction

[ak′rəsō′məl]
the pattern of various chemical changes that occur in the anterior of the head of the spermatozoon in response to contact with the ovum and that lead to the sperm's penetration and fertilization of the ovum.

Acrosomal Reaction

A necessary and irreversible step in fertilisation, which is triggered by a sperm receptor, in which the sperm’s and ovum’s plasma membranes fuse and the sperm penetrates the ovum’s zona pellucida.

acrosomal reaction

Reproductive medicine A necessary and irreversible step in fertilization which is triggered by sperm receptor, in which the sperm's and ovum's plasma membranes fuse and the sperm penetrates the zona pellucida. Cf Capacitation.

acrosomal reaction

(ak″rŏ-sō′măl)
The release of enzymes from the acrosome on the head of the sperm. This process causes the sperm to penetrate the zona pellucida of the egg and begin fertilization.
References in periodicals archive ?
Combination of Trolox and EDTA partly improved frozen-thawed sperm motility and reduced the spontaneous acrosomal reaction of sperm.
This might reflect an increase of acrosomal volume, which could be related to the acrosomal reaction process.
Cholesterol and zinc usually stabilize sperm cell membrane and must be removed during capacitation to enable acrosomal reaction and penetration of the ova.
Manipulation of cord structures is not associated with the production of ASA (20) and even the effect of ASA on acrosomal reaction has been challenged in some studies (21).
At this point you might be wondering how binding of the sperm to the zona pellucida induces the morphologic changes associated with the acrosomal reaction.
Induction of the acrosomal reaction in mouse spermatozoa by the solution of pellucid zone from alpaca (Lama pacos L.
The second, third and fourth steps of this process, respectively, are the acrosomal reaction, the sperm cell and egg cell adhesion through the vitelline envelope, and the actual membrane contact between the two cells.
0 mM)] were thawed and evaluated under phase-contrast microscope (40 A-) for sperm motility whereas sperm viability plasma membrane integrity and acrosomal integrity were assessed by the supravital staining hypo-osmotic swelling test (HOST) and normal acrosomal reaction respectively.
7) These glycoconjugates are involved in spermatogenesis, (2) capacitation, and acrosomal reaction.
After incubation, sperm swim through the egg jelly coat and become bound to the vitelline envelope within 30 sec, followed by an acrosomal reaction at 1 min.
1991) have reported that the maturation condition of the nucleus and cytoplasm of follicular oocytes plays a decisive role in the growth of in vitro fertilized oocytes after fertilization, and cumulus cells mediate an important effect on acrosomal reaction of sperms, in vitro fertilization and the growth of fertilized oocytes in pigs.
F-actin pre acrosomal reaction denotes the amount of filamentous actin present in unreacted sperm visualized by fluorescent staining and electron microscopy.