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Related Experiment Videos

Endothelin stimulates testosterone secretion by rat Leydig cells

D Conte1, P Questino, S Fillo

  • 1Cattedra di Andrologia, Istituto di Clinica Medica V, Università La Sapienza, Rome, Italy.

The Journal of Endocrinology
|February 1, 1993
PubMed
Summary

Endothelin (ET) peptides stimulate rat Leydig cell testosterone production, acting via calcium channels. This study reveals endothelin as a novel paracrine factor influencing testicular steroidogenesis.

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Area of Science:

  • Reproductive biology
  • Endocrinology
  • Cell signaling

Background:

  • Endothelin (ET) is a peptide with known vasoconstrictive properties.
  • Its role in testicular function, specifically steroidogenesis, is not fully elucidated.
  • Prostaglandins (PG) and extracellular calcium are potential mediators in reproductive processes.

Purpose of the Study:

  • To investigate the effects of endothelin-1 (ET-1) and endothelin-3 (ET-3) on rat testicular steroidogenesis in vitro.
  • To determine the involvement of prostaglandins (PG) and extracellular calcium in the mechanism of ET action.
  • To explore the interaction of ET with human chorionic gonadotrophin (hCG) and the influence of specific inhibitors.

Main Methods:

  • Primary rat Leydig cells were used for in vitro experiments.

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  • Effects of ET-1 and ET-3 on basal and hCG-stimulated testosterone secretion were measured.
  • Prostaglandin E2 (PGE2) release was assessed after ET-1 exposure.
  • Experiments included the use of indomethacin (cyclooxygenase inhibitor) and nifedipine (calcium-channel blocker).

    • Main Results:

    • ET-1 and ET-3 significantly stimulated basal testosterone production; ET-3 effect was less pronounced.
    • ET-1 exposure led to a concomitant release of PGE2.
    • A synergistic interaction was observed between ET-1 and hCG in enhancing testosterone production.
    • Indomethacin did not alter ET-1-induced testosterone output, but nifedipine completely blocked the stimulatory effect of ET-1.
    • ET-1 action was dependent on voltage-operated Ca2+ channels, not essential for PGE2 activation.

    Conclusions:

    • Endothelin peptides, particularly ET-1, act as novel paracrine factors influencing steroidogenesis in rat Leydig cells.
    • The steroidogenic effect of ET-1 in Leydig cells is mediated through the activation of voltage-operated calcium channels.
    • Prostaglandin E2 release is associated with ET-1 action but not essential for its steroidogenic effect.