Zona Pellucida
Mostrando 1-12 de 68 artigos, teses e dissertações.
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1. Intrafollicular barriers and cellular interactions during ovarian follicle development
Abstract Follicles are composed of different interdependent cell types including oocytes, cumulus, granulosa, and theca cells. Follicular cells and oocytes exchange signaling molecules from the beginning of the development of the primordial follicles until the moment of ovulation. The follicular structure transforms during folliculogenesis; barriers form bet
Anim. Reprod.. Publicado em: 28/11/2019
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2. Molecular adjuvant interleukin-33 enhances the antifertility effect of Lagurus lagurus zona pellucida 3 DNA vaccine administered by the mucosal route
It has been shown that cytokines can act as molecular adjuvant to enhance the immune response induced by DNA vaccines, but it is unknown whether interleukin 33 (IL-33) can enhance the immunocontraceptive effect induced by DNA vaccines. In the present study, we explored the effects of murine IL-33 on infertility induced by Lagurus lagurus zona pellucida 3 (Lz
Braz J Med Biol Res. Publicado em: 10/12/2013
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3. Cryopreservation of testicular and epididymal sperm: techniques and clinical outcomes of assisted conception
The introduction of the technique of intracytoplasmic sperm injection to achieve fertilization, especially using surgically retrieved testicular or epididymal sperm from men with obstructive or non-obstructive azoospermia, has revolutionized the field of assisted reproduction. The techniques for the retrieval of spermatozoa vary from relatively simple percut
Clinics. Publicado em: 2013
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4. Estimativa da população, caracterização morfométrica e ultraestrutural e criopreservação de folículos ovarianos pré-antrais de gatas domésticas
The aim of the present study was to estimate the population and morphometrically and ultrastructurally characterize preantral follicles from queen ovaries. In the first experiment, a total of 190 preantral follicles (100 primordial, 60 primary and 30 secondary) were analyzed by light microscopy. The diameters of the follicle, oocyte and oocyte nucleus were t
Publicado em: 2009
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5. Use of biotech manipulation of oocytes enclosed in preantral follicles for in vitro evaluation of potential anti-zona pellucida to imunoesterilização bitches. / Utilização da biotécnica de manipulação de oócitos inclusos em folículos pré-antrais para a avaliação in vitro do potencial de anticorpos anti-zona pelúcida para a imunoesterilização de cadelas.
The aim of this study was do evaluate the potential of anti-zona pellucida antibodies for immunosterilization in dogs, through analyzing the capability of anti-porcine zona pellucida (pZP) antibodies to cause atresia of preantral follicles (PF). For this purpose, the biotechnique of manipulation of oocytes enclosed in preantral follicles was employed to esta
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 22/12/2008
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6. Foliculogênese, maturação nuclear e citoplasmática de oócitos bubalinos - Bubalus bubalis : uma análise estrutural
The rusticity and milk production with high market value make possible to buffalos be bred in low or highly technified production system. On the other way, some species inherent characteristics make difficult to apply reproductive biotechniques to multiply animals (mainly females) with high genetic potential. Considering this, the present research establishe
Publicado em: 2008
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7. Synthesis of zona pellucida proteins by denuded and follicle-enclosed mouse oocytes during culture in vitro
During growth of the ovarian follicle, the mammalian oocyte becomes surrounded by an acellular coat called the zona pellucida. Whether the zona pellucida originates from the oocyte, surrounding follicle cells, or both has remained an unresolved issue. In experiments described here, denuded and follicle-enclosed mouse oocytes at various stages of growth were
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8. Adherence of bovine viral diarrhea virus to bovine oocytes and embryos with a hardened zona pellucida cultured in vitro
The purpose of this study was to investigate the adherence of bovine viral diarrhea virus (BVDV) to bovine mature, or immature, cumulus-free oocytes and to in vitro fertilized embryos, maintained in vitro in a ligated bovine oviduct to allow for the hardening of the zona pellucida. Incubation of the oocytes and embryos in the oviduct for 5 h caused hardening
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9. Early Contact Interactions between Mammalian Gametes In Vitro: Evidence That the Vitellus Influences Adherence between Sperm and Zona Pellucida
A study in vitro of interactions between gametes of the golden hamster showed that the spermatozoon associates with the zona pellucida, or outer coat of the ovum, by two successive steps termed attachment and binding. Attachment, apparently the first step in fertilization, is not species-specific; it is insensitive to temperature (2°) and is reversible. Bin
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10. Conserved Furin Cleavage Site Not Essential for Secretion and Integration of ZP3 into the Extracellular Egg Coat of Transgenic Mice
The extracellular zona pellucida surrounding mammalian eggs is formed by interactions of the ZP1, ZP2, and ZP3 glycoproteins. Female mice lacking ZP2 or ZP3 do not form a stable zona matrix and are sterile. The three zona proteins are synthesized in growing oocytes and secreted prior to incorporation into the zona pellucida. A well-conserved furin site upstr
American Society for Microbiology.
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11. Targeted disruption of the mZP3 gene results in production of eggs lacking a zona pellucida and infertility in female mice.
Mammalian eggs are surrounded by a thick extracellular coat, the zona pellucida, that plays important roles during early development. The mouse egg zona pellucida is constructed of three glycoproteins, called mZP1, mZP2, and mZP3. The gene encoding mZP3 is expressed only by growing oocytes during a 2- to 3-week period of oogenesis. Here, the mZP3 gene was di
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12. Modulation of fertilization in vitro by peptides released during hamster sperm-zona pellucida interaction.
The penetration of the zona-pellucida by hamster sperm in vitro (assay drops) was inhibited by aliquots of ultrafiltrates obtained from another set of drops (experimental drops) in which capacitated sperm had interacted with the surface of the zona pellucida. This inhibition was inversely related to the concentration of sperm in the assay drop, and it was no