Developmental capacity of mouse oocytes cryopreserved before and after maturation in vitro.
Cell-Survival, Cryopreservation, Female, Fertilization-in-Vitro, FSH, Mice, Mice-Inbred-Strains, Oocytes, Ovulation, Ovum, Support-Non-U, S, -Gov't, Support-U, S, -Gov't-P, H, S
J Reprod Fertil 1990 May; 89(1):43-50.
The survival and developmental capacity of cumulus cell-enclosed oocytes frozen (1) at the germinal vesicle (GV) stage, after maturation in vitro with (2) and without (3) FSH, and (4) after gonadotrophin-stimulated ovulation were assessed. Survival, defined as the number of morphologically normal oocytes, after freeze-thaw at the GV stage (69%), was lower than for oocytes frozen after ovulation (84%), and after maturation in vitro with FSH (88%) and without FSH (81%). Treatment with DMSO without freezing had no effect on survival when compared with untreated controls except in immature GV-stage oocytes for which there was a slight reduction. After insemination in vitro, 9% of frozen-thawed GV-stage oocytes cleaved to two equal blastomeres, but none developed to blastocysts. Of oocytes matured in vitro before freezing, 17% cleaved to the 2-cell stage and 18% of these developed to blastocysts. When oocytes were matured in vitro in the presence of FSH, however, the percentage cleaving to the 2-cell stage after freeze-thaw was improved to 55%, and 77% of 2-cell stage embryos developed to blastocysts. When ovulated cumulus cell-enclosed oocytes were frozen, 88% cleaved and 67% of the cleaved embryos developed to blastocysts. When 158 two-cell embryos resulting from oocytes matured in vitro with FSH were transferred to the oviducts of pseudopregnant foster mothers, 41 genetically marked live young were produced (26%).(ABSTRACT TRUNCATED AT 250 WORDS)
Schroeder, A C.; Champlin, A K.; Mobraaten, L E.; and Eppig, J J., " Developmental capacity of mouse oocytes cryopreserved before and after maturation in vitro." (1990). Faculty Research 1990 - 1999. 49.