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Structure and gametogenic potential of seminiferous tubules in ageing mice
Abstract:
The gametogenic potential of young male CBA/Ca mice aged 4-5 months was compared with that of animals 20-23 months of age which had recently ceased to sire offspring. The older mice had substantially lower circulating levels of testosterone and smaller testes. Testicular and epididymal spermatozoa were reduced in number, had more abnormal forms and fewer were progressively motile. Ageing seminiferous tubules varied in the degree of functional atrophy from complete depletion of germ cells to maintenance of sperm production. They were enclosed by a thickened basal lamina and more collagenous connective tissue and occasionally allowed the penetration of lanthanum between Sertoli cells into the ad-luminal compartment. There was no evidence of autosensitization to sperm antigens.
Insights
Aging significantly impairs male fertility in mice, reducing sperm count, motility, and increasing abnormalities. Older mice exhibit lower testosterone and testicular changes, impacting reproductive capacity.
Area of Science:
- Reproductive biology
- Gerontology
- Male reproductive health
Background:
- Male reproductive function declines with age.
- Understanding age-related changes in spermatogenesis is crucial for fertility research.
Purpose of the Study:
- To compare the gametogenic potential of young adult male mice with aged mice nearing the end of their reproductive lifespan.
- To investigate the impact of aging on testicular parameters and sperm quality in mice.
Main Methods:
- Comparative analysis of reproductive parameters between young (4-5 months) and aged (20-23 months) male CBA/Ca mice.
- Assessment of circulating testosterone levels, testes size, sperm count, morphology, and motility.
- Histological examination of seminiferous tubules and Sertoli cell function.
Main Results:
- Aged mice showed significantly lower testosterone levels and smaller testes compared to young mice.
- Testicular and epididymal sperm counts were reduced in aged mice, with increased abnormal forms and decreased progressive motility.
- Seminiferous tubules in aged mice displayed variable functional atrophy, thickened basal lamina, increased collagen, and occasional breaches in the Sertoli cell barrier.
- No evidence of autoimmune response to sperm antigens was observed in aged mice.
Conclusions:
- Aging in male mice leads to a significant decline in reproductive potential, characterized by hormonal, testicular, and sperm quality deterioration.
- Structural changes in seminiferous tubules and Sertoli cell function contribute to age-related infertility.
- The study highlights the multifaceted nature of male reproductive aging and its impact on fertility.