Results 11 to 20 of about 190,003 (291)
Frontiers in Endocrinology, 2021 BackgroundCurrently, in China, only women undergoing in vitro fertilization/intracytoplasmic sperm injection (IVF/ICSI) cycles can donate oocytes to others, but at least 15 oocytes must be kept for their own treatment.
Zhiqin Bu +3 more
doaj +1 more source
Regulated mitochondrial DNA replication during oocyte maturation is essential for successful porcine embryonic development. [PDF]
, 2007 Cellular ATP is mainly generated through mitochondrial oxidative phosphorylation, which is dependent on mitochondrial DNA (mtDNA). We have previously demonstrated the importance of oocyte mtDNA for porcine and human fertilization.
Alderson, Jon +2 more
core +7 more sources
Nature Communications, 2020 Meiotic cell division in oocytes is asymmetric and requires microtubule spindle migration after anaphase-onset. Here, the authors show that Nampt, an enzyme of the Nicotinamide adenine dinucleotide (NAD) biosynthetic pathway, contributes to post-anaphase
Zhe Wei +3 more
doaj +1 more source
Cells, 2021 Cumulus cells (CCs) originating from undifferentiated granulosa cells (GCs) differentiate in mural granulosa cells (MGCs) and CCs during antrum formation in the follicle by the distribution of location. CCs are supporting cells of the oocyte that protect
Bongkoch Turathum +2 more
doaj +1 more source
Implications of oocyte cryostorage for the practice of oocyte donation [PDF]
Human Reproduction, 2012 As the efficiency of oocyte cryopreservation has increased rapidly in recent years, oocytes are currently being stored either in the course of IVF treatments or as a fertility preservation measure. These practices may have an impact on the number of available donor oocytes due to two different dynamics: first, a certain percentage of women for whom ...
Guido de Wert +3 more
openaire +3 more sources
Transcriptionally inactive oocyte-type 5S RNA genes of Xenopus laevis are complexed with TFIIIA in vitro [PDF]
, 1987 An extract from whole oocytes of Xenopus laevis was shown to transcribe somatic-type 5S RNA genes approximately 100-fold more efficiently than oocyte-type 5S RNA genes.
Eversole-Cire, Pamela +4 more
core +1 more source
Oocyte activation deficiency: a role for an oocyte contribution? [PDF]
Human Reproduction Update, 2015 Infertility affects between 10 and 16% of couples worldwide. Twenty to 30% of cases of infertility are due to a male factor, 20-35% to a female factor, and 25-40% are due to both male and female factors. In ∼10-25% of cases, the precise underlying cause remains unclear.
Yeste, M +4 more
openaire +4 more sources
Porcine oocyte maturation in vitro : role of cAMP and oocyte-secreted factors: a practical approach [PDF]
, 2016 Polyspermy or the penetration of more than one sperm cell remains a problem during porcine in vitro fertilization (IVF). After in vitro culture of porcine zygotes, only a low percentage of blastocysts develop and their quality is inferior to that of in ...
Appeltant, Ruth +4 more
core +2 more sources
Human Reproduction, 1998 Cryopreservation of human oocytes has been employed with little success in clinical practice, even though it may solve the legal and ethical problems linked to embryo freezing. Various attempts to cryopreserve human oocytes have mostly been unsuccessful, leading to low oocyte survival rates after thawing, and the search for an optimal protocol for ...
R, Fabbri +8 more
openaire +2 more sources
cAMP Pulsing of Denuded Mouse Oocytes Increases Meiotic Resumption Via Activation of AMP-activated Protein Kinase [PDF]
, 2009 cAMP plays a critical role in the control of oocyte maturation, as a high level of cAMP maintains oocyte arrest at the first meiotic prophase. Yet this study shows that pulsing meiotically arrested denuded oocytes (DO) with cAMP induces oocyte maturation
Chen, Jing +3 more
core +2 more sources