Abstract:
:Oocytes have been successfully cryopreserved using rapid and slow freezing procedures. However, variability in the success of replicates has limited its practical application. In the present study, mature mouse oocytes were vitrified in 6 M dimethyl sulfoxide supplemented with 1 mg/ml antifreeze glycoproteins (AFGP) (solution known as VSD + AFGP) from the blood of Antarctic notothenioid fish. Such AFGPs have been used to protect mammalian cells during hypothermia and cryopreservation. However, the degree of protection afforded is a contentious issue. Stepwise addition of cryoprotectant was performed either at room temperature (19-21 degreesC) or on ice (2-4 degreesC), at the final stage of which oocytes were pipetted into 0.25 ml plastic insemination straws and held in liquid nitrogen vapor at -140 degreesC for 3 min before being plunged into liquid nitrogen. Thawing involved holding the straw in the air for 10 s and then in water at 20 degreesC for 10 s before dilution of the VSD solution with 1 M sucrose. Viability was assessed by in vitro fertilization; results have been quoted as median (range). Statistical analyses were performed using Kruskall-Wallis and Mann-Whitney U tests (P < 0.05). Of the oocytes cryopreserved following exposure to VSD + AFGP at room temperature (n = 518, 15 experimental runs), 78% (0-94%) retained normal morphology and, of these, 53% (0-100%) cleaved to two cells. Of these two-cell embryos, 56% (0-100%) went on to develop to blastocyst. The overall percentage development to blastocyst, i.e., number of blastocysts/total number of oocytes treated x 100, was 20% (0-76%). Exposure of oocytes to the VSD + AFGP on ice prior to cryopreservation yielded significantly improved rates of fertilization (94%, 82-100%) and overall development to blastocyst (66%, 24-89%) when compared with oocytes cryopreserved following exposure to the VSD + AFGP at room temperature. Rates of normality (86%, 35-95%) and development to blastocyst (89%, 64-100%) were also improved. Cryopreservation in 6 M dimethyl sulfoxide supplemented with 1 mg/ml AFGP resulted in poor rates of survival which were highly variable when exposure to cryoprotective agent (CPA) was performed at room temperature. Lowering the temperature of exposure to CPA prior to cryopreservation resulted in improved viability.
journal_name
Cryobiologyjournal_title
Cryobiologyauthors
O'Neil L,Paynter SJ,Fuller BJ,Shaw RW,DeVries ALdoi
10.1006/cryo.1998.2098subject
Has Abstractpub_date
1998-08-01 00:00:00pages
59-66issue
1eissn
0011-2240issn
1090-2392pii
S0011-2240(98)92098-3journal_volume
37pub_type
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