Abstract
Purpose. The aim of this study was to ascertain the characteristics of major salivary glands endocrine effect on spermatogenesis. Materials and methods. Mature white outbred male rats (2 months, 153 ± 18 g) consisted of the following groups (each containing 30 rats): intact, control, and group of rats subjected to multiple amputation of incisors. To achieve hypertrophy of major salivary glands multiple amputation of incisors was performed: incisors were cut to a level of 1-2 mm above the gingival margin under ether anesthesia once every 3 days within 2 weeks. Animals of the control group were anesthetized with ether at the same time. Rats were sacrificed by CO 2 asphyxia after 2, 3, 4, 6, 8 and 10 weeks after the first amputation of incisors. Fragments of the rat testes were examined on a JEM-1400 “JEOL” (Japan) transmission electron microscope. On electron microscopy images the specific vacuolization of the cytoplasm of Sertoli cells, spermatogonia, spermatocytes and spermatids (standard units) was analyzed by the point counting method. In spermatogenic cells the proportion of mitochondria (%) with morphological signs of swelling was assessed. Results. Transient ultrastructural changes of Sertoli and spermatogenic cells develop in the rats convoluted seminiferous tubules as a result of multiple amputation of the incisors, such as phagosomes and pronounced vacuolization in the Sertoli cells cytoplasm, cytoplasm vacuolization and mitochondrial swelling in spermatogenic cells. Sporadic spermatogenic cells with signs of nuclear (chromatin fragmentation, its condensation on the periphery of the nucleus) and cytoplasm (destruction of membrane organelles) destruction appeared as a result of multiple incisors’ amputation. Ultrastructural changes of Sertoli and spermatogenic cells are most pronounced at 2-3 weeks, decrease at 4 week and are completely leveled by the 6th week of the experiment. Conclusion. Hypertrophy of major salivary glands, caused by multiple amputations of incisors, has similar to sialoadenectomy effect on the spermatogenic epithelium. Multiple incisors’ amputation cause transient depression of granular convoluted cells function. Probably submandibular gland granular convoluted tubules cells endocrine factors make the greatest contribution to the regulation of spermatogenesis in rats.
Highlights
The aim of this study was to ascertain the characteristics of major salivary glands endocrine effect on spermatogenesis
To achieve hypertrophy of major salivary glands multiple amputation of incisors was performed: incisors were cut to a level of 1-2 mm above the gingival margin under ether anesthesia once every 3 days within 2 weeks
Transient ultrastructural changes of Sertoli and spermatogenic cells develop in the rats convoluted seminiferous tubules as a result of multiple amputation of the incisors, such as phagosomes and pronounced vacuolization in the Sertoli cells cytoplasm, cytoplasm vacuolization and mitochondrial swelling in spermatogenic cells
Summary
Выяснение особенностей эндокринного влияния больших слюнных желез на сперматогенез половозрелых крыс. Для оценки эндокринного влияния эпителиоцитов ацинусов и протоков больших слюнных желез моделировали их гипертрофию путем многократной ампутации резцов. В ранние сроки эксперимента в извитых семенных канальцах крыс развивается вакуолизация цитоплазмы сустентоцитов, а также ультраструктурные изменения сперматогенных клеток (вакуолизация цитоплазмы, альтерация митохондрий, разрушение мембранных органелл, фрагментация хроматина). Гипертрофия больших слюнных желез, вызванная многократной ампутацией резцов, оказывает на сперматогенный эпителий влияние, схожее с эффектом сиалоаденэктомии. В результате многократной ампутации резцов угнетается функциональное состояние клеток гранулярных извитых трубок поднижнечелюстных желез. Авторы декларируют отсутствие явных и потенциальных конфликтов интересов, связанных с публикацией настоящей статьи. Для цитирования: Иванова В.В., Тихонов Д.И., Мильто И.В., Серебрякова O.Н., Геренг Е.А., Плешко Р.И. Влияние гипертрофии больших слюнных желез на ультраструктуру сперматогенного эпителия крыс.
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