Testicular aging revisited: Current understanding of mechanisms and emerging interventions

Area of Science:

• Reproductive Biology
• Aging Research
• Molecular Mechanisms of Aging

Background:

• Male reproductive aging is characterized by reduced fertility, hormonal imbalances, and impaired spermatogenesis.
• Key molecular factors include mitochondrial dysfunction, oxidative stress, DNA damage, and inflammation.
• Age-related cellular changes affect Sertoli and Leydig cell function, disrupting the blood-testis barrier and germ cell support.

Purpose of the Study:

• To comprehensively review the molecular mechanisms of testicular aging.
• To highlight age-related changes in testicular cells and their functional consequences.
• To discuss emerging therapeutic strategies for male reproductive aging.

Main Methods:

• Literature review of molecular mechanisms in male reproductive aging.
• Synthesis of evidence on cellular and molecular changes in aging testes.
• Analysis of potential therapeutic targets and interventions.

Main Results:

• Testicular aging involves mitochondrial dysfunction, oxidative stress, DNA damage, impaired autophagy, inflammation, senescence, and apoptosis.
• Deterioration of Sertoli and Leydig cells leads to blood-testis barrier disruption, impaired steroidogenesis, and compromised germ cell support.
• Reduced sperm quantity and quality are outcomes of these age-related molecular and cellular changes.

Conclusions:

• Understanding the molecular basis of male reproductive aging is crucial for developing interventions.
• Targeting pathways like oxidative stress, DNA repair, autophagy, and inflammation shows promise for preserving male fertility.
• This review provides a framework for future research and therapeutic development in aging male reproduction.