Journal of Reproduction & Infertility

Journal of Reproduction & Infertility

The Effect of Preincubation Time and Myo-inositol Supplementation on the Quality of Mouse MII Oocytes

Authors
1 Student Research Committee, School of Medicine, Iran University of Medical Sciences (IUMS), Tehran, Iran; Anatomy Department, School of Medicine, Iran University of Medical Sciences (IUMS), Tehran, Iran
2 Shahid Akbar Abadi Clinical Research Development Unit (ShACRDU), Iran University of Medical Sciences (IUMS), Tehran, Iran; Cellular and Molecular Research Center, Iran University of Medical Sciences (IUMS), Tehran, Iran
3 Biochemistry Department, School of Medicine, Iran University of Medical Sciences (IUMS), Tehran, Iran
4 Anatomy Department, School of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran
5 Anatomy Department, School of Medicine, Iran University of Medical Sciences (IUMS), Tehran, Iran; Shahid Akbar Abadi Clinical Research Development Unit (ShACRDU), Iran University of Medical Sciences (IUMS), Tehran, Iran
Abstract
Background: It is demonstrated that optimal preincubation time improves oocyte quality, fertilization potential and developmental rate. This study aimed to evaluate the effect of preincubation time in the simple and myo-inositol supplemented medium on the oocyte quality regarding oxidative stress and mitochondrial alteration. Methods: Cumulus oocyte complexes (COCs) retrieved from superovulated NMRI mice were divided in groups of 0, 4 and 8 hr preincubation time in the simple and 20 mmol/L myo-inositol supplemented media. Intracellular reactive oxygen species (H2O2), glutathione (GSH), mitochondrial membrane potential (MMP), ATP content, and mitochondrial amount were measured and analyzed in experimental groups. One-way ANOVA and Kruskal-Wallis were respectively used for parametric and nonparametric variables. Statistical significance was defined as p<0.05. Results: In comparison to control group, variables including ROS, GSH, mitochondrial amount, fertilization and developmental rates were significantly changed after 4 hr of preincubation in the simple medium, while MMP decreased following 8 hr of preincubation in the simple medium (p˂0.001). Preincubation of oocytes up to 8 hr in the simple medium could not decrease ATP content. For both 4 and 8 hr preincubation times, myo-inositole could decrease H2O2 and increase GSH and MMP levels and consequently could improve fertilization rate compared to oocytes preincubated in the simple culture. Conclusion: It seems that 4 hr or more preincubation time can decrease the oocyte quality and lead to reduced oocyte fertilization and developmental potential. Howevere, myo-inositol may prevent oocyte quality reduction and improve fertilization potential in comparision to the equivalent simple groups.
Keywords

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