233 resultados para espermatozóides do epidídimo


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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

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Pós-graduação em Medicina Veterinária - FMVZ

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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

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Pós-graduação em Medicina Veterinária - FMVZ

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Pós-graduação em Medicina Veterinária - FMVZ

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A presente invenção permite produzir por centrifugação em gradiente de densidade, em empresas especializadas na produção e comercialização de sêmen congelado, doses de sêmen enriquecidas com espermatozóides portadores do cromossomo X ou Y, sem comprometer a capacidade fecundante destes espermatozóides. Pela presente invenção, doses de espermatozóides contendo ambos espermatozóides X e Y podem ser separadas para produzir sub populações de espermatozóides enriquecidas em portadores do cromossomo X ou Y, as quais são substancialmente puras em relação ao espermatozóide desejado e substancialmente livres do outro tipo de espermatozóide.

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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

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Aquaporins (AQPs) are membrane protein channels expressed in a wide variety of cells and tissues that are involved in the transport of water. In the male excurrent duct, the movement of fluid and solutes across the epithelium is essential for establishing the proper luminal environment in which sperm mature and are stored. The initial aim of the present propose is to localize AQP 2 e 9 in epithelium of the initial segment, caput, corpus and cauda epididymidis in Mongolian gerbil during postnatal development (10, 30, 60, 120 and 300 days), observing possible changes in the pattern of expression of the AQPs along the postnatal development. The animals will be killed by inhalation of carbon dioxide. After euthanasia, the epididymis will be removed and the different regions will be isolated. The biological material obtained will be processed in accordance with the routines of histological techniques and imunnohistochemistry to study the expression and localization of the AQPs 2 and 9. The results obtained will be analyzed and photographed in conventional light microscope

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Infertility is directly related to chromosomal abnormalities in germ cells. Among them, the aneuploidies are the most frequent chromosomal abnormalities and responsible for embryo implantation failures, miscarriages, fetal losses and newborns with congenital malformations, mental disability and neuropsychomotor developmental delay. Male patients with normal somatic karyotype may present different rates of aneuploidies in sperm, resulting in abnormal embryos. This study aimed to correlate the frequency of chromosomal aneuploidies in spermatozoa with embryo implantation rate in couples undergoing assisted reproductive techniques. The methodology has included chromosomal analysis by GTG banding and molecular cytogenetic study using Fluorescent In Situ Hybridization technique for evaluation of chromosomes 9, X and Y in germ cells of 22 patients referred to the Human Reproduction Service of the Clinical Hospital FMRP-USP. Embryo implantation rates were determined by hormonal evaluation in maternal peripheral blood and ultrasound confirmation. Two patients presented abnormal karyotype, characterized by polymorphism of the heterochromatic region of the long arm of chromosome 9 and a satellite in the short arm of chromosome 22. Both alterations, usually considered variants of normality, have been related to infertility phenotype and miscarriages. Significant differences were detected between couples who presented pregnancy (group 1) and couples with embryo implantation failure (group 2), with higher frequency of aneusomy and diploidy of chromosome 9, as well as total aneuploidy in sperm of group 2 patients. Our results suggest a correlation between aneuploidy and embryo implantation rates, since the infertile group with reproductive failure has showed higher frequency of aneuploidy. Screening for aneuploidies detection in male germ cells should be included in order to decrease embryo implantation failures, miscarriages and fetuses with chromosomal ...

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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)