- Academic Editor
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†These authors contributed equally.
Background: Recently, the utilization of sugar as a cryoprotectant has
garnered significant attention. Sucrose and trehalose, as non-permeable
cryoprotectants, can effectively regulate the osmotic pressure inside and outside
cells while maintaining cell membrane stability during cryopreservation.
Furthermore, it has been observed that monosaccharides sugars, particularly
fructose, exhibit superior efficacy in preserving the quality of frozen
substances as compared to disaccharides and trisaccharides
sugars. Nevertheless, there is currently limited research assessing the
cryopreservation effects of sucrose, trehalose, and fructose. The objective of
this experiment is to identify the best cryoprotectant between sucrose,
trehalose, and fructose for intact rat ovaries. Methods:
Intact ovaries with blood vessels were obtained from 20 adult
Lewis female rats and divided accordingly into four groups: control
(non-vitrified), sucrose, fructose, and trehalose. The ovarian samples were
subjected to a stepped cryoprotectant exposure and subsequently follicular
histological analysis using light and electron microscopy.
Ovarian cell apoptosis was evaluated by BCL2-Associated X (BAX)
immunohistochemistry and Terminal Deoxynucleotidyl Transferase-Mediated
Deoxyuridine Triphosphate nick End-Labeling (TUNEL) analyses. Results:
The sucrose and the trehalose groups preserved the ovarian histological structure
better than the fructose group. Additionally, there was no statistical difference
in the total follicle number between the sucrose and trehalose groups, but the
percentage of apoptotic cells in the trehalose group was significantly lower than
that of the sucrose group (p