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INSL3 ligand-receptor system in the equine testis.
Thomas Klonisch1, Klaus Steger, Astrid Kehlen
1Departments of Anatomy and Cell Biology, Martin Luther University Halle-Wittenberg, Faculty of Medicine, Halle, Germany. thomas.klonisch@medizin.uni-halle.de
Biology of Reproduction
|February 28, 2003
Summary
Equine Leydig cells express INSL3, a hormone crucial for testicular function. Its expression decreases in cryptorchid and prepubertal testes, indicating transcriptional regulation and identifying the testis as a potential target of INSL3.
Area of Science:
- Reproductive Biology
- Endocrinology
- Molecular Biology
Background:
- INSL3 (insulin-like factor 3) is a key hormone in the insulin-like superfamily.
- Leydig cells are vital for testicular function and hormone production.
Purpose of the Study:
- To investigate INSL3 expression in equine testes across different developmental and functional states.
- To identify the equine INSL3 receptor (Lgr8) and its role.
Main Methods:
- Molecular and immunological techniques including in-situ hybridization, immunohistochemistry, quantitative PCR, and Western blot analysis.
- Analysis of prepubertal, postpubertal (normal and disturbed spermatogenesis), and cryptorchid equine testes.
Main Results:
- INSL3 transcripts and protein were localized to Leydig cells in all investigated equine testes.
- A significant down-regulation of INSL3 and up-regulation of its receptor (Lgr8) were observed in cryptorchid testes.
- Equine proINSL3 expression was significantly lower in cryptorchid and prepubertal testes compared to adult normal testes, suggesting transcriptional regulation.
Conclusions:
- Equine INSL3 expression is transcriptionally regulated and reduced in cryptorchid and prepubertal testes.
- The testis is identified as a potential target of INSL3, with Lgr8 playing a role in its action.