Vitrification of canine cumulus-oocyte complexes in DAP213 with a cryotop holder.
Reprod Med Biol 2010;
9:115-120. [PMID:
29662428 DOI:
10.1007/s12522-010-0045-6]
[Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2009] [Accepted: 12/25/2009] [Indexed: 10/19/2022] Open
Abstract
Purpose
The effects of the cryoprotectant and the container (holder) used for the vitrification of canine germinal vesicle stage oocytes were examined to improve the cryopreservation method for canine oocytes and embryos.
Methods
Canine cumulus-oocyte complexes (COCs) were collected from ovaries, and were vitrified with E30S (30% ethylene glycol and 0.5 M sucrose) or DAP213 (2 M dimethyl sulfoxide, 1 M acetamide, and 3 M propylene glycol) solution held by a cryotube or cryotop sheets. After warming, the oocytes were stained with propidium iodide for the assessment of their plasma membrane integrity.
Results
In all the vitrification groups, more than 65% of the vitrified oocytes displayed a normal morphology (E30S-top, 65.6%; DAP-tube, 67.3%; DAP-top, 80.0%). However, when assessed by propidium iodide staining, the viability of oocytes in the DAP-top group (43.6%) was higher than that in the E30S-top group (21.3%, P < 0.05). Furthermore, the viability of the oocytes in the DAP-top group (43.6%) was higher than that in the DAP-tube group (4.1%, P < 0.05).
Conclusions
These results suggest that a combination of DAP213 as the cryoprotectant and a cryotop sheet as the holder improved viability after the vitrification of canine oocytes at the germinal vesicle stage.
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