Initial phases of the rat testis differentiation in vitro

Area of Science:

• Reproductive biology
• Developmental biology
• Cell biology

Background:

• Testicular differentiation is a critical process in male reproductive development.
• Understanding the factors influencing early testicular organogenesis is essential for reproductive health research.

Purpose of the Study:

• To investigate the in vitro effects of fetal calf serum on the differentiation of rat testicular cords.
• To determine the impact of serum on Sertoli cell differentiation and cord formation during early development.

Main Methods:

• Rat gonadal primordia were explanted at various developmental stages (undifferentiated, early differentiation, cord formation).
• Cultures were maintained in CMRL 1066 medium with or without 15% fetal calf serum for 1-4 days.
• Sex was determined using the sex chromatin test on amniotic membrane samples.

Main Results:

• Fetal calf serum prevented seminiferous cord differentiation but allowed primordial Sertoli cell appearance.
• In established testes, serum caused seminiferous cord disintegration.
• Sertoli cell differentiation was not inhibited by serum, but organogenesis/maintenance was impaired.

Conclusions:

• Fetal calf serum negatively impacts the structural organization of early rat testes.
• The results highlight the sensitivity of testicular cord development to specific culture medium components.
• This study supports existing histological findings on initial testicular differentiation stages.