Contents
Academic literature on the topic 'Itraplasmatic injection of spermatozoa into the oocyte'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Itraplasmatic injection of spermatozoa into the oocyte.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Journal articles on the topic "Itraplasmatic injection of spermatozoa into the oocyte"
1
Abramova, S., and D. Korobkov. "Survey look at the problem of subsidiary reproductive technologies." Bulletin of Science and Practice, no. 8 (August 15, 2017): 120–27. https://doi.org/10.5281/zenodo.842907.
Full textAbstract:
This review the problems of modern reproductive technologies. Due to the global introduction and application of assisted reproductive technologies that contribute to the restoration of fertility in infertile couples and allow the realization of the function of procreation in various diseases that until recently were considered completely incompatible with the onset of pregnancy is one of the topical problems of reproductive medicine. The problem of restoring human fertility has largely stimulated the development of new directions in assisted reproductive technologies, which include in vitro fertilization (IVF), embryo transfer (EТ), and itraplasmatic injection of spermatozoa into the oocyte (IISО).
2
Kasai, T., K. Hoshi, and R. Yanagimachi. "Effect of sperm immobilisation and demembranation on the oocyte activation rate in the mouse." Zygote 7, no. 3 (1999): 187–93. http://dx.doi.org/10.1017/s0967199499000568.
Full textAbstract:
To analyse the effect of the state of the sperm plasma membrane on oocyte activation rate following intracytoplasmic sperm injection (ICSI), three types of human and mouse spermatozoa (intact, immobilised and Triton X-100 treated) were individually injected into mouse oocytes. At 30, 60 and 120 min after injection, maternal chromosomes and sperm nuclei within oocytes were examined. Following human sperm injection, the fastest and the most efficient oocyte activation and sperm head decondensation occurred when the spermatozoa were treated with Triton X-100. Intact spermatozoa were the least effective in activating oocytes. Thus, the rate of mouse oocyte activation following human sperm injection is greatly influenced by the state of the sperm plasma membrane during injection. When mouse spermatozoa were injected into mouse oocytes, the rates of oocyte activation and sperm head decondensation within activated oocytes were the same irrespective of the type of sperm treatment prior to injection. We witnessed that live human spermatozoa injected into moue oocytes often kept moving very actively within the ooplasm for more than 60 min, whereas motile mouse spermatozoa usually became immotile within 20 min after injection into the ooplasm. In 0.002% Triton X-100 solution, mouse spermatozoa are immobilised faster than human spermatozoa. These facts seem to suggest that human sperm plasma membranes are physically and biochemically more stable than those of mouse spermatozoa. Perhaps the physical and chemical properties of the sperm plasma membrane vary from species to species. For those species whose spermatozoa have ‘stable’ plasma membranes, prior removal or ‘damage’ of sperm plasma membranes would increase the success rate of ICSI.
3
Yazawa, Hiroyuki, Kaoru Yanagida, Shoutaro Hayashi, and Akira Sato. "The oocyte activation and Ca2+ oscillation-inducing abilities of mouse and human dead (sonicated) spermatozoa." Zygote 17, no. 2 (2009): 175–84. http://dx.doi.org/10.1017/s0967199408005157.
Full textAbstract:
SummaryIn ICSI procedures, it is well known that the selection of viable (live) spermatozoa and certain types of immobilization prior to injection is very important for obtaining successful results, but unfortunately there are rare situations when only immotile spermatozoa are available (such as in severe asthenozoospermia or necrozoospermia). In such cases, failure of oocyte activation after ICSI often occurs and may be due to the lack of SOAF (sperm-borne oocyte activating factor) activity. In order to investigate the SOAF activities of dead spermatozoa, mouse and human spermatozoa were immobilized (killed by sonication), maintained in THF medium for varying time intervals (up to 72 h) and then injected into mature unfertilized mouse oocytes. Injected mouse oocytes were examined for their activation, development into blastocysts and Ca2+ responses by imaging and confocal laser scanning microscope. The rates of oocyte activation, blastocyst development and normal patterns of Ca2+ oscillation from the killed-sperm-injected oocytes decreased gradually in accordance with the maintenance interval between sonication and injection. For injection with mouse sonicated spermatozoa, the rate of normal Ca2+ oscillations declined first (after a 3 h maintenance interval) and then blastocyst development was gradually obstructed (after approx. 10 h). The oocyte activation-inducing ability of dead spermatozoa was maintained for a relatively long period, but began to decline after 20 h. The activation rates and Ca2+ response of the oocytes that were injected with human sonicated spermatozoa decreased earlier than those injected with mouse spermatozoa. Although the oocyte activation-inducing ability was maintained for a relatively long time after the death of the spermatozoa, embryo development into blastocysts and the rate of normal Ca2+ oscillations declined after a short maintenance interval between sonication and injection. The Ca2+ response seemed to be the most sensitive indicator for the evaluating the SOAF activity of dead (killed) spermatozoa.
4
Katayama, Mike, Takashi Miyano, Masashi Miyake, and Seishiro Kato. "Progesterone treatment of boar spermatozoa improves male pronuclear formation after intracytoplasmic sperm injection into porcine oocytes." Zygote 10, no. 2 (2002): 95–104. http://dx.doi.org/10.1017/s0967199402002137.
Full textAbstract:
Boar spermatozoa were prepared for intracytoplasmic sperm injection (ICSI) by two different treatments to facilitate sperm chromatin decondensation and improve fertilisation rates after ICSI in pigs: spermatozoa were either frozen and thawed without cryoprotectants, or treated with progesterone. Morphological changes of the sperm heads after the treatments were examined and then the activation of oocytes and the transformation of the sperm nucleus following ICSI were assessed. After freezing and thawing, the plasma membrane and acrosomal contents over the apical region of sperm head were lost in all the spermatozoa. Following treatment with 1 mg/ml progesterone, the acrosome reaction was induced in 61% of spermatozoa. After injection of three types of spermatozoa, non-treated spermatozoa and progesterone-treated (i.e. acrosome-reacted) spermatozoa induced oocyte activation, but frozen-thawed spermatozoa induced oocyte activation at a significantly lower rate. Sixty-two per cent of sperm heads remained orcein-negative for 6 h, however, resulting in delayed sperm chromatin decondensation and low male pronuclear formation in the oocytes injected with a non-treated spermatazoon. Since the treatments of freezing and thawing and progesterone for spermatozoa accelerated the initial change in sperm chromatin and the latter treatment induced oocyte activation earlier, it is considered that the delay in oocyte activation and decondensation of sperm chromatin after injection of non-treated spermatozoa is caused by the existence of the sperm plasma membrane. These results show that progesterone treatment efficiently induces the acrosome reaction in boar spermatozoa without destroying their potency for oocyte activation, and the induction of the acrosome reaction results in the promotion of male pronuclear formation after ICSI.
5
Rybouchkin, Andrei V., Paul De Sutter, and Marc Dhont. "Unprotected freezing of human spermatozoa exerts a detrimental effect on their oocyte activating capacity and chromosome integrity." Zygote 4, no. 04 (1996): 263–68. http://dx.doi.org/10.1017/s0967199400003208.
Full textAbstract:
SummaryThe influence of unprotected freezing of mammalian spermatozoa on their oocyte activating capacity and chromosome integrity is unknown. However, this type of sperm treatment has been used in assisted reproduction by intracytoplasmic sperm injection in cattle and humans. The mouse oocyte injection test was used to analyse the influence of unprotected freezing of human spermatozoa on their reproductive characteristics. Mouse oocytes were microinjected with intact human spermatozoa or spermatozoa treated with two cycles of unprotected freeze-thawing. Oocytes surviving the injection were either cultured without further treatment or exposed to ethanol solution to induce parthenogenetic activation. Both injected and activated oocytes were used for sperm chromosome analysis. The results revealed a significant reduction in oocyte activating capacity and a tenfold increase in the incidence of structural chromosomal abnormalities in human spermatozoa treated by unprotected freezing. We conclude that unprotected freezing of human spermatozoa has a detrimental effect on their reproductive characteristics. Our data also provide a new perspective on the stability of mammalian spermatozoa to physical factors and demonstrate the importance of detailed analysis of the stability of sperm structures for successful development of new approaches in assisted reproduction.
6
Wakayama, T., T. Uehara, Y. Hayashi, and R. Yanagimachi. "The response of mouse oocytes injected with sea urchin spermatozoa." Zygote 5, no. 3 (1997): 229–34. http://dx.doi.org/10.1017/s096719940000366x.
Full textAbstract:
SummarySea urchin spermatozoa were injected into mature mouse oocytes to determine whether they can activate mouse oocytes and, if so, how they behave within the oocyte cytoplasm of such a distant species. While injection of a single spermatozoon into each oocyte did not activate any of the oocytes, injection of 10 spermatozoa activated about 20%. Within the cytoplasm of unactivated oocytes, sperm heads commonly transformed into chromosome-like structures. When a single spermatozoon was injected, and oocytes were then activated by Sr2+, about 30% of the activated oocytes had both female (mouse) and male (sea urchin) pronuclei when examined 8 h after sperm injection. These results indicated that sperm-borne oocyte activating factor(s) and the cytoplasmic factors controlling the development of the sperm pronucleus are not strictly species-specific.
7
Okitsu, Osamu, Shuji Yamano, and Toshihiro Aono. "Activation of bovine oocytes matured in vitro by injection of bovine and human spermatozoa or their cytosolic fractions." Zygote 9, no. 1 (2001): 89–95. http://dx.doi.org/10.1017/s0967199401001095.
Full textAbstract:
The aim of this study was to investigate whether bovine spermatozoa possess so-called sperm factor in the cytosolic fraction (CF) which activates bovine oocytes, and whether bovine oocytes matured in vitro are activated by microinjection of CF extracted from spermatozoa of other species. In the first experiment, bovine and human spermatozoa were microinjected into ooplasm of bovine oocytes matured in vitro. Secondly, CF from bovine and human spermatozoa were injected into bovine oocytes. In the third, CF from human spermatozoa was injected into human unfertilised oocytes obtained 18-20 h after clinical intracytoplasmic sperm injection (ICSI). We found that microinjection of bovine spermatozoa into bovine oocytes induced oocyte activation, as shown by resumption of meiosis and formation of a female pronucleus, at a significantly higher rate than the bovine sham injection (63.0% vs 43.0%; p < 0.05). On the other hand, there was no significant difference in activation rate between the human sperm injection (35.9%) and the human sham injection (22.9%). Furthermore, microinjection of bovine sperm CF into bovine oocytes induced oocyte activation at a significantly higher rate than the human CF injection or sham injection (75.9% vs 14.8%, 20.4%; p < 0.01). Formation of a single female pronucleus and second polar body extrusion was observed in 95.1% of activated oocytes after bovine sperm CF injection. When human sperm CF was injected into human unfertilised oocytes, the activation rate was significantly higher than following sham injection (76.9% vs 44.0%; p < 0.05). These results indicate the presence of sperm factor in bovine sperm CF which activate bovine oocytes, and suggest the possibility that sperm factor has species-specificity at least between bovine and human.
8
Kobayashi, Toshihiro, Kazue Amemiya, Kana Takeuchi, et al. "Contribution of spermatozoal centrosomes to the microtubule-organizing centre in Antarctic minke whale (Balaenoptera bonaerensis)." Zygote 14, no. 1 (2006): 45–51. http://dx.doi.org/10.1017/s0967199406003522.
Full textAbstract:
Using an interspecies microinsemination assay with bovine oocytes, it was examined whether centrosomes of Antarctic minke whale spermatozoa function as the microtubule-organizing centre (MTOC). Bull and rat spermatozoa were used as positive and negative controls, respectively. Vitrified-warmed bovine mature oocytes were subjected to immunostaining against α-tubulin 4–6 h after intracytoplasmic injection (ICSI) of 5 mM dithiothreitol-treated spermatozoa. Aster formation occurred from whale spermatozoa (33%) and bull spermatozoa (33%), but very little from rat spermatozoa (3%). Activation treatment for the microinseminated oocytes with 7% ethanol + 2 mM 6-dimethylaminopurine resulted in a similar proportion of oocytes forming a whale sperm aster (35% vs 27% in the non-treated group; 4 h after ICSI) but a significantly larger aster (ratio of aster diameter to oocyte diameter, 0.57 vs 0.30 in the non-treated group). These results indicate that the centrosome introduced into bovine oocytes by whale spermatozoa contributes to the MTOC and that assembly of the microtubule network is promoted by oocyte activation.
9
Gonzalez-Castro, Raul A., Fabio Amoroso-Sanches, JoAnne E. Stokes, James K. Graham та Elaine M. Carnevale. "Localisation of phospholipase Cζ1 (PLCZ1) and postacrosomal WW-binding protein (WBP2 N-terminal like) on equine spermatozoa and flow cytometry quantification of PLCZ1 and association with cleavage in vitro". Reproduction, Fertility and Development 31, № 12 (2019): 1778. http://dx.doi.org/10.1071/rd19217.
Full textAbstract:
Oocyte activation is initiated when a fertilising spermatozoon delivers sperm-borne oocyte-activating factor(s) into the oocyte cytoplasm. Candidates for oocyte activation include two proteins, phospholipase Cζ1 (PLCZ1) and postacrosomal WW-binding protein (PAWP; also known as WBP2 N-terminal like (WBP2NL)). We localised PLCZ1 and WBP2NL/PAWP in stallion spermatozoa and investigated the PLCZ1 content and sperm parameters as well as cleavage after intracytoplasmic sperm injection (ICSI). PLCZ1 was identified as 71-kDa protein in the acrosomal and postacrosomal regions, midpiece and principal piece of the tail. Anti-WBP2NL antibody identified two WBP2NL bands (~28 and ~32kDa) in the postacrosomal region, midpiece and principal piece of the tail. PLCZ1 and WBP2NL expression was positively correlated (P=0.04) in sperm heads. Flow cytometry evaluation of PLCZ1 revealed large variations in fluorescence intensity and the percentage of positively labelled spermatozoa among stallions. PLCZ1 expression was significantly higher in viable than non-viable spermatozoa, and DNA fragmentation was negatively correlated with PLCZ1 expression and the percentage of positively labelled spermatozoa (P&lt;0.05). The use of equine sperm populations considered to have high versus low PLCZ1 content resulted in significantly higher cleavage rates after ICSI of bovine and equine oocytes, supporting the importance of PLCZ1 for oocyte activation.
10
Ishchuk, Mariia A., Evgeniia M. Komarova, Elena A. Lesik, et al. "DNA-fragmented sperm ability to bind to the zona pellucida." Journal of obstetrics and women's diseases 72, no. 6 (2023): 63–76. http://dx.doi.org/10.17816/jowd569417.
Full textAbstract:
BACKGROUND: A high percentage of the infertile couples are classified as having unexplained infertility. At the same time, male partners may have both normozoospermia and high level of sperm DNA fragmentation. The investigation of the selectivity of the oocyte zona pellucida for spermatozoa with fragmented DNA is an extremely promising direction. The novel data could improve sperm selection methods, which in turn will increase the efficiency of IVF cycles.
 AIM: The aim of this study was to assess the ability of spermatozoa with fragmented DNA to bind to the zona pellucida.
 MATERIALS AND METHODS: The material for the study was ejaculate samples from patients with normozoospermia (n = 5) and sperm donors (n = 4), as well as the zona pellucida of immature oocytes (n = 25) from nine patients. Sperm preparation was carried out by centrifugation in a density gradient of silicone particles and the swim-up method. Sperm DNA fragmentation was assessed using the method of fluorescent labeling of single- and double-stranded DNA breaks (TUNEL assay). Manipulations with gametes and the zona pellucida were performed using micromanipulation equipment and a femtosecond laser.
 RESULTS: Spermatozoa with fragmented DNA can effectively bind to the oocyte zona pellucida. However, among the zona pellucida-bound spermatozoa, the proportion of cells with fragmented DNA was significantly lower than among the unbound ones. The data obtained suggest the key role of the oocyte zona pellucida in the selection of spermatozoa with intact DNA.
 CONCLUSIONS: Spermatozoa with fragmented DNA retain the ability to bind to the oocyte zona pellucida. The use of the selective binding of spermatozoa with intact DNA to the zona pellucida can serve as a method for selecting gametes for intracytoplasmic injection of spermatozoa into the oocyte. Data on the selective properties of the oocyte zona pellucida can serve to select the optimal strategy in cases of “hidden” male factor, in which men with normozoospermia experience impaired fertility, in particular, due to sperm DNA fragmentation.
Book chapters on the topic "Itraplasmatic injection of spermatozoa into the oocyte"
1
Tournaye, Herman J. "Insemination, in vitro fertilization, and intracytoplasmic sperm injection." In Oxford Textbook of Endocrinology and Diabetes. Oxford University Press, 2011. http://dx.doi.org/10.1093/med/9780199235292.003.9111.
Full textAbstract:
Anamnesis, physical examination, and additional tests may reveal a specific cause of reproductive failure in infertile men. Whenever this is found, a specific treatment or cure should be applied. When no such treatment is available, or when specific treatment has failed, techniques of assisted reproduction may be proposed to couples suffering from long-standing male infertility. The rationale behind these is to bring the spermatozoa closer to the oocyte in an attempt to enhance the fertilization process. In recent years the role of assisted reproduction has become more important, and it has often been stated that these techniques have made clinical work-up or specific treatment of the male partner pointless. However, this is far from true. Not only may correction of a specific dysfunction in the male avoid the use of assisted reproductive techniques, but careful work-up and treatment may also enhance the outcome of these treatments. Assisted reproductive techniques should not be viewed as a primary treatment option, but rather as a complementary treatment when other treatments have failed, or have been judged inadequate after a complete work-up.