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Cellular interrelationships in the fetal rabbit testis

B Gondos, C J Connell

    Archives of Andrology
    |January 1, 1978
    PubMed
    Summary
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    Fetal rabbit testes show developing cell junctions, including gap junctions in Leydig cells, crucial for testosterone production. Unlike adults, mature tight junctions are absent, allowing free passage of substances within testicular cords.

    Area of Science:

    • Reproductive Biology
    • Developmental Biology
    • Cell Biology

    Background:

    • The fetal testis undergoes significant development, including the establishment of cellular interrelationships essential for its function.
    • Understanding these early membrane specializations is key to comprehending testicular development and potential disruptions.

    Purpose of the Study:

    • To investigate the membrane interrelationships and junctional specializations in the fetal rabbit testis.
    • To characterize the types and arrangement of cell junctions during early testicular development.

    Main Methods:

    • Coordinated use of freeze-fracture electron microscopy, lanthanum tracer, and standard transmission electron microscopy.
    • Detailed ultrastructural analysis of germ cells, Sertoli cells, peritubular myoid cells, and Leydig cells.

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    Main Results:

    • Desmosomes were observed between germ cells and Sertoli cells, and between adjacent Sertoli cells.
    • Absence of adult-type tight junctions between Sertoli cells; presence of particle strands on Sertoli and peritubular myoid cell membranes.
    • Lanthanum tracer permeated intercellular spaces, indicating no barrier formation within cords; prominent gap junctions found on fetal Leydig cells.

    Conclusions:

    • The fetal rabbit testis exhibits distinct membrane specializations compared to the adult, with developing junctional complexes.
    • The presence of gap junctions in fetal Leydig cells suggests a role in coordinating testosterone production during this critical developmental window.