N-cadherin mediates Sertoli cell-spermatogenic cell adhesion

Area of Science:

• Reproductive Biology
• Cell Biology
• Molecular Biology

Background:

• Sertoli and spermatogenic cells form complex structures in the testis.
• Cell surface adhesion molecules are crucial for regulating cell interactions within the seminiferous epithelium.
• N-cadherin mRNA expression in mice suggests its involvement in testicular cell binding.

Purpose of the Study:

• To investigate the presence and function of N-cadherin in rat testicular cell adhesion.
• To determine if N-cadherin mediates Sertoli cell-germ cell adhesion.

Main Methods:

• Western blot analysis of purified plasma membranes from Sertoli and spermatogenic cells using anti-N-cadherin antiserum.
• Immunofluorescence assays to detect N-cadherin on germ cells and Sertoli cells.
• Cytometer-assisted cell-cell binding assay to assess the inhibitory effect of anti-N-cadherin antiserum on testicular cell adhesion.

Main Results:

• N-cadherin was detected on the surface membranes of both rat Sertoli cells and spermatogenic cells.
• Western blot analysis showed N-cadherin reactivity at approximately 130 kDa in both cell types.
• Immunofluorescence confirmed N-cadherin labeling on germ and Sertoli cells.
• Anti-N-cadherin antiserum reduced specific testicular cell-cell adhesion by 30%-50% in vitro.
• Pre-incubation of either cell type with the antiserum was sufficient to inhibit adhesion.

Conclusions:

• N-cadherin is expressed by both Sertoli cells and spermatogenic cells in the rat testis.
• N-cadherin partially mediates Sertoli cell-germ cell adhesion.
• This study provides the first evidence that antibodies against the N-cadherin recognition sequence can inhibit cell-cell interactions.
• N-cadherin is identified as a key regulatory molecule involved in cellular associations within the mammalian seminiferous tubule.