[Age-related characteristics of structural support for ovarian function]

Area of Science:

• Reproductive biology
• Endocrinology
• Histology

Background:

• Ovarian function and reproductive capacity decline with age.
• Microcirculatory changes and the integrity of the hematofollicular barrier are crucial for ovarian health.
• Understanding age-related alterations in ovarian enzyme activity is key to reproductive science.

Purpose of the Study:

• To investigate age-dependent changes in ovarian enzyme activity in rats.
• To explore the role of microcirculation and the hematofollicular barrier in reproductive aging.
• To assess the histophysiological integration of follicular cells in aging ovaries.

Main Methods:

• Histoenzymological assays were performed on rat ovaries from two age groups (3-4 months and 12-14 months).
• Enzyme activities studied included steroid dehydrogenases (3 beta-, 17 beta-, 20 alpha-), glucose-6-phosphate dehydrogenase, NAD and NADP-diaphorases, esterase, acid and alkaline phosphatases.
• Microcirculatory parameters and cell-to-cell linkages within the ovarian follicle were examined.

Main Results:

• Significant age-dependent depression in reproductive and endocrine functions was observed in older rats.
• Alterations in microcirculation, including the hematofollicular barrier, were identified as primary factors in age-related reproductive decline.
• Aging rats showed a lack of linkage between endothelial, thecal, and granular cells, indicating compromised follicular system integration.

Conclusions:

• Microcirculatory transport alterations, particularly at the hematofollicular barrier, are critical in age-related reproductive dysfunction.
• The disruption of cell-to-cell communication within the follicle contributes to the decline in ovarian function during aging.
• Histophysiological mechanisms underlying follicular system integration are impaired in aging rats, impacting fertility.