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The Sertoli cell in lizards.

B Baccetti, E Bigliardi, M Vegni Talluri

    Journal of Ultrastructure Research
    |October 1, 1983
    PubMed
    Summary
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    Lizard Sertoli cells exhibit complex structures, including a robust blood-testis barrier with unique junctions. These findings offer insights into reptilian reproductive biology and cell junction evolution.

    Area of Science:

    • Comparative cell biology
    • Reproductive biology
    • Herpetology

    Background:

    • Sertoli cells are crucial for spermatogenesis, forming the blood-testis barrier.
    • Understanding Sertoli cell ultrastructure in reptiles provides insights into vertebrate reproductive evolution.

    Purpose of the Study:

    • To characterize the ultrastructure of lizard Sertoli cells.
    • To investigate the components of the blood-testis barrier in lizards.
    • To compare lizard Sertoli cell junctions with those in other vertebrates.

    Main Methods:

    • Transmission electron microscopy was used to examine Sertoli cell ultrastructure.
    • Immunocytochemistry was employed to identify cytoskeletal components.
    • Analysis of junctional complexes between Sertoli cells.

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    Main Results:

    • Lizard Sertoli cells display abundant endoplasmic reticulum, multivesicular bodies, and lipid vacuoles.
    • The cytoskeleton is rich in actin, vimentin, and peripheral microtubules.
    • A highly efficient blood-testis barrier is formed by diverse junctions, including unique 'Sertoli-Sertoli' junctions lacking an actin layer and desmosome-like junctions associated with 7-nm filaments.

    Conclusions:

    • Lizard Sertoli cells possess specialized ultrastructural features related to their function.
    • The identified junctional complexes highlight the efficiency of the reptilian blood-testis barrier.
    • Unique junctional characteristics in lizards contribute to our understanding of Sertoli cell evolution and function across vertebrates.