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The effects of metformin on stereological and ultrastructural features of the ovary in streptozotocin -induced diabetes adult rats: An experimental study
Mehrabianfar, Parisa; Dehghani, Farzaneh; Karbalaei, Nargess & Mesbah, Fakhroddin
Abstract
Background: Diabetes is a chronic disease that can affect almost all of the body organs,
including male and female reproductive systems.
Objective: This study was designed to investigate the preventive effects of metformin
on stereological and ultrastructure characteristics of the ovary in the streptozotocin-induced
diabetes adult female rats.
Materials and Methods: Seventy adult (8-10 wk) female Sprague-Dawley rats (180-200
gr) were equally divided, as follows: (n = 10/each) control; STZ-induced diabetes (single
dose of 65 mg/kg STZ, IP); metformin-treated (50 mg/100 gr of body weight, orally);
diabetic-metformin-treated; sham 1, (single dose of sodium citrate); sham 2, (0.5 ml of
daily oral distilled water); and sham 3, (sodium citrate + distilled water treated). The
body mass index, ovarian weight, blood sugar level, cholesterol, and triglyceride were
measured. The stereological and ultrastructural features of ovary were assessed.
Results: The blood sugar of induced-diabetic rats was increased (p < 0.01). The BMI (p <
0.01), number of granulosa cells (p = 0.04), primordial, primary and secondary follicles
(p = 0.03), total volume of ovary (p < 0.01) and cortex, nucleus diameter ratio to the
ooplasm were decreased. The number of atretic follicles in the diabetic and diabetic +
metformin-treated rats were increased (p < 0.01). The ultrastructural characteristics of
ovary were more damaged in diabetic rats.
Conclusion: Diabetes has destructive effects on ovarian follicles and causes follicular
atresia. Also, the size of oocytes, numbers of granulosa cells and ooplasmic organelles,
which are involved in the folliculogenesis are affected by diabetes and metformin has
no preventive effects.
Keywords
Diabetes; Metformin; Ovary; Tissue.
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