Apoptosis process in mouse Leydig cells during postnatal development

Area of Science:

• Reproductive Biology
• Developmental Biology
• Cell Biology

Background:

• Mammalian Leydig cell development follows a biphasic pattern, involving fetal and adult populations.
• The role of apoptosis in Leydig cell development and survival remains incompletely understood.

Purpose of the Study:

• To investigate the occurrence and patterns of apoptosis in mouse Leydig cells throughout postnatal testicular development.
• To differentiate Leydig cell apoptosis from germ cell apoptosis during key developmental stages.

Main Methods:

• Utilized electron microscopy for morphological assessment of Leydig cell apoptosis.
• Employed in situ DNA fragmentation analysis using terminal deoxynucleotidyl transferase (TdT) staining.
• Examined testes across neonatal, prepubertal, puberty, and adult developmental periods.

Main Results:

• No evidence of apoptosis was observed in Leydig cells during neonatal, prepubertal, puberty, or adult stages.
• Morphological and DNA fragmentation analyses consistently indicated an absence of Leydig cell apoptosis.
• Apoptotic DNA fragmentation was detected in germ cells within seminiferous tubules during prepubertal and puberty stages.

Conclusions:

• Leydig cells do not undergo apoptosis during postnatal development in mice.
• The involution or degeneration of remaining fetal Leydig cells in neonatal testes may occur through non-apoptotic mechanisms.
• Germ cells, not Leydig cells, exhibit apoptosis during specific postnatal testicular developmental phases.