Talk:In Vitro Fertilization: Difference between revisions
From Embryology
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* Effects of In Vitro Maturation on Histone Acetylation in Metaphase II Oocytes and Early Cleavage Embryos. http://www.ncbi.nlm.nih.gov/pubmed/20613962 | * Effects of In Vitro Maturation on Histone Acetylation in Metaphase II Oocytes and Early Cleavage Embryos. http://www.ncbi.nlm.nih.gov/pubmed/20613962 | ||
** free article http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2896857/?tool=pubmed | ** free article http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2896857/?tool=pubmed | ||
* Reorganization of the Endoplasmic Reticulum and Development of Ca2+ Release Mechanisms During Meiotic Maturation of Human Oocytes. http://www.ncbi.nlm.nih.gov/pubmed/20610804 | |||
** "Oocyte maturation in rodents is characterized by a dramatic reorganization of the endoplasmic reticulum (ER) and an increase in the ability of an oocyte to release Ca(2+) in response to fertilization or inositol 1,4,5-trisphosphate (IP(3)). We examined if human oocytes undergo similar changes during cytoplasmic meiotic maturation both in vivo and in vitro. Immature, germinal vesicle (GV)-stage oocytes had a fine network of ER throughout the cortex and interior, whereas the ER in in vivo-matured metaphase II (MII)-stage oocytes was organized in large (~2-3 microm) accumulations throughout the cortex and interior. Likewise, oocytes matured in vitro exhibited cortical and interior clusters with no apparent polarity with regard to the meiotic spindle. In vivo-matured oocytes contained approximately 1.5X the amount of IP3 receptor protein and released significantly more Ca(2+) in response to IP(3) than GV-stage oocytes; however, oocytes matured in vitro did not contain more IP(3) receptor protein or release more Ca(2+) in response to IP(3) than GV-stage oocytes. These results show that at least one cytoplasmic change occurs during in vitro maturation of human oocytes that might be important for fertilization and subsequent embryonic development but suggest that a low developmental competence of in vitro matured oocytes could be due to deficiencies in the ability to release Ca(2+) at fertilization." | |||
Revision as of 15:18, 20 July 2010
Other Species
- Sheep (ovine) http://www.ncbi.nlm.nih.gov/pubmed/20615540
- Horse (equine) http://www.ncbi.nlm.nih.gov/pubmed/20591059
Effects
- Effects of In Vitro Maturation on Histone Acetylation in Metaphase II Oocytes and Early Cleavage Embryos. http://www.ncbi.nlm.nih.gov/pubmed/20613962
- Reorganization of the Endoplasmic Reticulum and Development of Ca2+ Release Mechanisms During Meiotic Maturation of Human Oocytes. http://www.ncbi.nlm.nih.gov/pubmed/20610804
- "Oocyte maturation in rodents is characterized by a dramatic reorganization of the endoplasmic reticulum (ER) and an increase in the ability of an oocyte to release Ca(2+) in response to fertilization or inositol 1,4,5-trisphosphate (IP(3)). We examined if human oocytes undergo similar changes during cytoplasmic meiotic maturation both in vivo and in vitro. Immature, germinal vesicle (GV)-stage oocytes had a fine network of ER throughout the cortex and interior, whereas the ER in in vivo-matured metaphase II (MII)-stage oocytes was organized in large (~2-3 microm) accumulations throughout the cortex and interior. Likewise, oocytes matured in vitro exhibited cortical and interior clusters with no apparent polarity with regard to the meiotic spindle. In vivo-matured oocytes contained approximately 1.5X the amount of IP3 receptor protein and released significantly more Ca(2+) in response to IP(3) than GV-stage oocytes; however, oocytes matured in vitro did not contain more IP(3) receptor protein or release more Ca(2+) in response to IP(3) than GV-stage oocytes. These results show that at least one cytoplasmic change occurs during in vitro maturation of human oocytes that might be important for fertilization and subsequent embryonic development but suggest that a low developmental competence of in vitro matured oocytes could be due to deficiencies in the ability to release Ca(2+) at fertilization."
