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Hepatocyte growth factor modulates Sertoli-Sertoli tight junction dynamics
A Catizone1, G Ricci, M Galdieri
1Department of Histology and Medical Embryology, School of Medicine, University of Rome Sapienza, Rome, Italy.
Hepatocyte growth factor (HGF) reduces occludin in mammalian testes, impacting Sertoli cell tight junctions and spermatogenesis. HGF also increases active TGF-beta via urokinase-type plasminogen activator (uPA).
Area of Science:
- Reproductive Biology
- Cell Biology
- Molecular Endocrinology
Background:
- Sertoli cells in mammalian testes form crucial tight junctions for spermatogenesis.
- Hepatocyte growth factor (HGF) is a cytokine known to affect cellular tight junctions.
Purpose of the Study:
- To investigate the role of HGF in regulating testicular occludin levels and localization.
- To explore HGF's influence on TGF-beta activation and its relationship with uPA in the testis.
Main Methods:
- Confocal microscopy was used to analyze occludin localization in testicular tissue.
- Levels of occludin, TGF-beta (total and active), and uPA were measured in the presence and absence of HGF.
Main Results:
- HGF decreased testicular occludin levels and altered its localization within tight junctions.
- HGF significantly increased the active fraction of TGF-beta, independent of total TGF-beta levels.
- HGF also significantly increased urokinase-type plasminogen activator (uPA) levels in the testis.
Conclusions:
- HGF modulates Sertoli-Sertoli tight junctions by reducing and redistributing occludin.
- HGF likely regulates active TGF-beta levels through modulation of uPA in the testis.
- These findings suggest HGF plays a significant role in maintaining testicular function and spermatogenesis.
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