PURPOSE OF THE STUDY
To study the molecular biological mechanisms of the decrease in ovarian reserve after surgical treatment of deep infiltrative endometriosis in patients of reproductive age.
MATERIALS AND METHODS
A prospective cohort comparative study was carried out. The main group consisted of 70 patients of reproductive age who underwent surgical treatment of deep infiltrative endometriosis (DIE), the comparison group consisted of 50 fertile patients who underwent uterine plastic surgery. All patients underwent an assessment of ovarian reserve before and 6 months after surgical treatment. An immunohistochemical study was performed to determine the level of expression of estrogen receptors, regulators of apoptosis (p53, Bcl-2, AKT, PTEN) and angiogenesis (VEGF R1) in the follicle granulosa of the ovarian biopsy, as well as in the epithelium of the glands and stroma of endometrioid lesions.
RESULTS
When assessing the state of the ovarian reserve, it was found that the level of AMH at the preoperative stage was significantly lower in patients with HIE (2.4±2.0 ng/ml) than in patients of the comparison group (3.6±2.9 ng/ml), p<0.05. Six months after the surgical treatment of DIE, there was a significant decrease in the level of AMH (1.7±1.5 ng/ml) compared with the baseline (2.4±2.0 ng/ml), p<0.05.
A decrease in ovarian reserve in patients with HIE was associated with a reduced expression of estrogen receptors in the ovarian granulosa tissue, which indicates the formation of ovarian hormonal resistance in this disease. In the cortical tissue of the ovaries in patients of the first group, there was a decrease in the expression of PTEN and an increase in the expression of AKT compared to the second group, which indicates the activation of the anti-apoptotic signaling pathway PI3K/Akt/mTOR in endometriosis. On the other hand, there is a weakening of Bcl-2 expression and an increase in p53 expression in ovarian granulosa tissue in patients of the first group with a significant postoperative decrease in ovarian reserve.
CONCLUSION
Activation of the anti-apoptotic signaling pathway PI3K/Akt/mTOR plays a significant role in the decrease in ovarian reserve after surgical treatment of DIE, contributing to the premature depletion of primordial follicles. Compensating for the increased proliferative activity, the ovarian cortex is sensitized to p53-associated apoptosis, which leads to the formation of a vicious pathogenetic circle and the irreversible loss of the follicular reserve. This dictates the need to timely address the issue of surgical treatment of patients of reproductive age with HIE in terms of maintaining the ovarian reserve.