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Treatment with cholesterol-loaded methyl-beta-cyclodextrin increased the cholesterol in rabbit oocytes, but did not improve developmental competence of cryopreserved oocytes

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URI
http://hdl.handle.net/20.500.11939/5413
DOI
10.1016/j.cryobiol.2013.05.006
Derechos de acceso
openAccess
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Author
Jiménez-Trigos, E.; Vicente, José Salvador; Mocé, Eva; Naturil-Alfonso, C.; Fernandez-Gonzalez, R.; Gutiérrez-Adan, A.; Marco-Jiménez, Francisco
Date
2013
Cita bibliográfica
Jimenez-Trigos, E., Vicente, J.S., Moce, E., Naturil-Alfonso, C., Fernandez-Gonzalez, R., Gutierrez-Adan, A., Marco-Jimenez, F. (2013). Treatment with cholE.ol-loaded methyl-beta-cyclodextrin increased the cholE.ol in rabbit oocytes, but did not improve developmental competence of cryopreserved oocytes. Cryobiology, 67(1), 106-108.
Abstract
Membrane cholesterol:phospholipids ratio is an important determinant of cell chilling sensitivity. At low temperatures, major membrane destabilisation occurs when the membrane undergoes a phase transition. To increase membrane fluidity and stability during cooling and thus increase oocyte cryoresistance, cholesterol has been added to the plasma membrane. This study was conducted to determine if cholesterol could be incorporated into rabbit oocytes by incubation with cholesterol-loaded methyl-beta-cyclodextrin (CLC) and if added cholesterol could improve the developmental ability of cryopreserved oocytes after parthenogenetic activation or intracytoplasmic sperm injection. Fresh, frozen and vitrified oocytes incubated with CLC containing 20% NBD-labelled cholesterol (NBD-CLC) were evaluated using confocal microscopy. Fluorescence intensity was higher in fresh oocytes than in cryopreserved ones. Pre-treating rabbit oocytes with 1 mg of NBD-CLC/mL did not improve cleavage and developmental rates after cryopreservation. Results showed that treatment with CLC increased the cytoplasmic cholesterol content, but did not improve cleavage rate and developmental competence of cryopreserved oocytes.
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