نتایج جستجو برای: assisted oocyte activation

تعداد نتایج: 568818  

Marziyeh Tavalee Mohammad Hossein Nasr Esfahani Mohammad Reza Deemeh Shahnaz Razavi

The aim of this report has been evaluating protamine content and DNA integrity of two patients with globozoospermia undergoing Intra Cytoplasmic Sperm Injection (ICSI). Semen analysis was carried out according to WHO criteria. Protamine deficiency and DNA fragmentation was assessed using Chromomycin A3 and sperm chromatin dispersion assay respectively. ICSI and chemical activation were carried ...

2018
Juan Enrique Schwarze Paula Borda Pamela Vásquez Carolina Ortega Sonia Villa Javier A. Crosby Ricardo Pommer

OBJECTIVE Preeclampsia (PE) occurs in 4.6% of pregnancies worldwide. The social phenomenon of increasing maternal age has raised the demand for donor oocytes. Egg donation has allowed women with poor ovarian reserve, premature ovarian failure, genetic disorders or surgical menopause to get pregnant. Recipients provide a unique model of immune response because of the differences in the genetic m...

Azadbakht M Khazaei M, Rashidi Z Sadri S

Background: Cryopreservation of ovaries is an important technique in assisted reproduction technology. Physical forces like hydrostatic pressure have a pivotal role in reproduction systems. Due to changes in intrafollicular pressure during ovulatory process, this study designed to examine the effects of hydrostatic pressure on oocyte maturation and cell death in cumulus cells from cryopreserved...

2016
Jiang Zhu Fei-Hu Lin Jie Zhang Juan Lin Hong Li You-Wei Li Xiu-Wen Tan Jing-He Tan

In spite of great efforts, the mechanisms for postovulatory oocyte aging are not fully understood. Although our previous work showed that the FasL/Fas signaling facilitated oocyte aging, the intra-oocyte signaling pathways are unknown. Furthermore, the mechanisms by which oxidative stress facilitates oocyte aging and the causal relationship between Ca2+ rises and caspase-3 activation and betwee...

Journal: :Molecular Human Reproduction 2008
Qinglei Li Laurie J. McKenzie Martin M. Matzuk

Prediction and improvement of oocyte competence are two critical issues in assisted reproductive technology to improve infertility therapy. The lack of reliable and objective predictors of oocyte developmental competence for oocyte/embryo selection during in vitro fertilization hampers the effectiveness of this technology. Likewise, the low pregnancy rate resulting from in vitro maturation of h...

Journal: :The International journal of developmental biology 2011
Brigitte Ciapa Christophe Arnoult

A calcium signal during oocyte or egg activation is a conserved event in virtually all species analyzed so far. This signal, that is in the form of calcium oscillations in mammals, is spatially and temporally controlled and is mainly supported by calcium release from internal calcium stores, but how it is triggered after fertilization is far from understood. The sperm factor hypothesis of egg a...

2014
Fernanda Paulini Renata Carvalho Silva José Luiz Jivago de Paula Rôlo Carolina Madeira Lucci

The ultrastructural analysis of oocytes and ovarian follicles has been used to evaluate the effects of assisted reproductive techniques, such as cryopreservation or in vitro oocyte maturation. It also benefits the understanding of such complex mechanisms that occur during folliculogenesis. From the beginning of primordial follicles growth until oocyte maturation in preovulatory follicles oocyte...

2017
Ramon Cesar Botigelli Eduardo Montanari Razza Elisa Mariano Pioltine Marcelo Fábio Gouveia Nogueira

Several discoveries have been described recently (5-10 years) about the biology of ovarian follicles (oocyte, cumulus cells and granulosa cells), including new aspects of cellular communication, the control of oocyte maturation and the acquisition of oocyte competence for fertilization and further embryo development. These advances are nourishing assisted reproduction techniques (ART) with new ...

2012
Ivailo Vangelov Julieta Dineva Krassimira Todorova Soren Hayrabedyan Maria D. Ivanova

The female infertility is a complex phenomenon that at least in part resides in the manifestation, possible perturbations and interplay of innate and adaptive immunity, with the participation of apoptotic and reactive oxygen species pathways, and some paracrine factors as causative and implementing factors in this process. The spread of the assisted reproduction technologies provided an unseen ...

اعتمادی, کتایون, امیری, ایرج, ربیعی, صغری, همت پور, زینب, گودرزی, محمدتقی,

Introduction & Objective: Polycystic ovary syndrome (PCOS) is the most common endocrine disorder in women of reproductive age. According to the Rotterdam criteria, this syndrome is identified by presence of two of three criteria: (1) polycystic ovaries (2) oligo/anovulation and/or (3) clinical or biochemical evidence of hyperandrogenism. Low mature oocyte and embryo have been reported in poly...

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