Sertoli cells are the source of stem cell factor for spermatogenesis

Area of Science:

• Reproductive biology
• Cell biology
• Developmental biology

Background:

• Spermatogenesis requires a supportive microenvironment created by various testicular somatic cells.
• The precise sources and roles of key growth factors, like stem cell factor (SCF), in this process remain unclear.
• Previous studies lacked systematic analysis of growth factor expression and conditional gene deletion from specific cell types.

Purpose of the Study:

• To identify the specific cell types responsible for producing stem cell factor (SCF) in the testes.
• To determine the essential role of SCF, particularly from Sertoli cells, in regulating spermatogenesis.
• To investigate the impact of SCF manipulation (deletion and overexpression) in specific testicular cell populations.

Main Methods:

• Single-cell RNA sequencing was employed to analyze gene expression patterns in testicular cells.
• Fluorescent reporter mice were utilized to track and manipulate gene expression in specific cell types.
• Conditional deletion and overexpression strategies were applied to study the function of SCF in vivo.

Main Results:

• Stem cell factor (SCF) is broadly expressed in various testicular stromal cells, including Sertoli cells.
• Conditional deletion of SCF specifically from Sertoli cells resulted in the blockage of spermatogonial differentiation and complete male infertility.
• Conditional overexpression of SCF in Sertoli cells enhanced spermatogenesis, while overexpression in endothelial cells had no significant effect.

Conclusions:

• Sertoli cells are the critical source of SCF required for spermatogenesis.
• The anatomical localization and specific production of SCF by Sertoli cells are essential for regulating male germ cell development.
• Targeting SCF production in Sertoli cells offers a potential strategy for addressing male infertility.