Three-dimensional reconstruction of a rat stage V Sertoli cell: I. Methods, basic configuration, and dimensions

Area of Science:

• Reproductive Biology
• Cell Biology
• Histology

Background:

• Sertoli cells are essential for spermatogenesis, providing structural and metabolic support to developing germ cells.
• Understanding the three-dimensional morphology of Sertoli cells is critical for elucidating their role in the seminiferous epithelium.
• Previous studies have lacked a comprehensive view of the Sertoli cell's external profile.

Purpose of the Study:

• To reconstruct and analyze a three-dimensional model of a stage V rat Sertoli cell.
• To provide an unencumbered external profile of the Sertoli cell.
• To detail the cell's dimensions, shape, and interactions with germ cells.

Main Methods:

• Reconstruction of a stage V rat Sertoli cell from 223 semiserial electron microscopy sections.
• Creation of a 7,800x enlarged, five-part disassemblable Plexiglas model.
• Calculation of cell dimensions and volume based on the physical model.

Main Results:

• The reconstructed Sertoli cell model measured 89.8 µm (centripetal), 41.2 µm (longitudinal), and 29.5 µm (circumferential) axes.
• The cell exhibited an irregularly columnar shape with distinct lateral processes (conical, cup-shaped, flattened) interacting with germ cells.
• Elongate spermatids were housed in deep recesses, with apical processes forming tapered luminal extensions.

Conclusions:

• This study presents the first detailed external profile of a Sertoli cell through a physical 3D model.
• The model illustrates one of two major configurations of Sertoli cells during the spermatogenic cycle.
• The findings enhance our understanding of Sertoli cell structure-function relationships in male reproduction.