Porcine Leydig cells: central regulators of boar reproductive development and fertility

Area of Science:

• Reproductive Biology
• Endocrinology
• Cell Biology

Background:

• Leydig cells in the testicular interstitium are vital for producing sex steroids like testosterone and 17β-estradiol.
• These steroids are critical for male fertility, sexual differentiation, and reproductive processes.

Purpose of the Study:

• To detail the unique three-phase development and function of Leydig cells in pigs.
• To elucidate the regulatory mechanisms and key proteins involved in porcine Leydig cell steroidogenesis.
• To highlight the essential role of Leydig cells in maintaining boar fertility.

Main Methods:

• Review of existing literature on porcine Leydig cell development and function.
• Analysis of the steroidogenic pathway and regulatory proteins (e.g., StAR, CYP enzymes, HSDs).
• Examination of the hormonal regulation by luteinizing hormone and the impact on reproductive processes.

Main Results:

• Pigs exhibit three distinct Leydig cell developmental phases: fetal, perinatal, and pre-pubertal to adult.
• Porcine Leydig cells produce androgens and significant levels of estrogens via the Δ5 pathway.
• Steroidogenesis involves acute (cholesterol mobilization, StAR activity) and chronic (gene expression, cell proliferation) responses.

Conclusions:

• Leydig cells are critical for male reproductive success in pigs, influencing fertility from development to adulthood.
• Understanding these unique developmental phases and steroidogenic processes is key to managing boar reproductive health.
• The intricate regulation of steroidogenesis by specific proteins underscores the complexity of male reproductive function.