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Endothelin-1: a new autocrine/paracrine factor in rat testis
G Fantoni1, P L Morris, G Forti
1Department of Clinical Physiopathology, University of Florence, Italy.
The American Journal of Physiology
|August 1, 1993
Summary
Sertoli cells in rat testes produce endothelin-1 (ET-1) under hormonal control. Leydig cells possess high-affinity ET-1 receptors, suggesting a local signaling role for ET-1 in the rat testis.
Area of Science:
- Reproductive biology
- Endocrinology
- Cell biology
Background:
- Endothelin-1 (ET-1) is a potent vasoconstrictor peptide.
- The role of ET-1 in testicular function is not fully understood.
Purpose of the Study:
- To investigate the production and localization of ET-1 in rat testes.
- To identify ET-1 binding sites in testicular cells.
Main Methods:
- Cultured rat Sertoli and Leydig cells were used.
- Endothelin-1-like immunoreactivity (ET-1-LI) was measured using radioimmunoassay and HPLC.
- Immunohistochemistry was performed on rat testicular tissue.
- Binding assays were conducted using 125I-labeled ET-1.
Main Results:
- Sertoli cells produced and released ET-1-like immunoreactivity under FSH control.
- Authentic ET-1 was detected in Sertoli cell culture medium.
- ET-1-like immunoreactivity was found in Sertoli cells of young rats and in Sertoli cells and interstitial cells of adult rats.
- Leydig cells exhibited high-affinity binding sites for ET-1, likely ETA receptors, with lower concentrations in Sertoli cells.
Conclusions:
- Testicular ET-1 is produced by Sertoli cells and potentially other testicular cells in adult rats.
- The presence of high-affinity ET-1 receptors on Leydig cells suggests an autocrine or paracrine role for ET-1 in testicular function.