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Regulated and Functional Expression of the Corepressor MTA3 in Rodent Testis
1Department of Obstetrics and Gynecology/Reproductive Medical Center (K.H.), The First Affiliated Hospital of Sun Yat-sen University, Guangzhou 510080, People's Republic of China; Department of Urology/Reproductive Medicine Research Center (H.Q.), The Sixth Affiliated Hospital of Sun Yat-sen University, Guangzhou 510655, People's Republic of China; and Departments of Medical Psychology (H.W.), Department of Gynecology and Obstetrics (S.Z.), Reproductive Medicine Center, Tangdu Hospital, Department of Pediatrics (X.-h.Q.), Xijing Hospital, and Department of Histology and Embryology (W.L.), Fourth Military Medical University, Xi'an 710032, People's Republic of China.
Metastasis-associated protein 3 (MTA3) is newly identified in mammalian testes, primarily in Leydig cells. MTA3 regulates steroidogenesis and is linked to hormonal and metabolic signaling, impacting testicular function.
Area of Science:
- Reproductive Biology
- Endocrinology
- Molecular Biology
Background:
- Metastasis-associated protein 3 (MTA3) is a component of the Mi-2/nucleosome remodeling and deacetylase complex.
- MTA3 regulates estrogen-dependent epithelial to mesenchymal transition and other physiological processes.
- Its role in the testis, a highly hormonal environment, remains largely unexplored.
Purpose of the Study:
- To investigate the expression and function of MTA3 in mammalian testes.
- To determine the regulatory mechanisms of MTA3 expression in testicular cells.
- To elucidate the role of MTA3 in testicular steroidogenesis and its association with dysfunction.
Main Methods:
- Immunohistochemistry to detect MTA3 protein in testicular tissue.
- Analysis of Mta3/MTA3 expression modulation by gonadotropins and metabolic signals (dexamethasone, T4, rosiglitazone).
- Short hairpin RNA (shRNA) mediated Mta3 ablation and MTA3 overexpression in MA-10 Leydig cells to assess progesterone secretion.
- Correlation analysis between Mta3 expression and serum testosterone levels in a murine model of type 2 diabetes mellitus.
Main Results:
- MTA3 protein is predominantly expressed in interstitial Leydig cells of mammalian testes.
- Testicular Mta3/MTA3 levels are modulated by pituitary gonadotropins and metabolic factors.
- Mta3 ablation significantly inhibited hCG/db-cAMP-stimulated progesterone secretion, while MTA3 overexpression rescued this effect.
- Reduced Mta3 expression correlated with deregulated serum testosterone in type 2 diabetic mice and was involved in insulin-mediated inhibition of steroidogenesis.
Conclusions:
- This study is the first to reveal the presence and functional significance of MTA3 in the testis.
- MTA3 expression is regulated by developmental, metabolic, and hormonal cues.
- MTA3 plays a crucial role in modulating testicular steroidogenic function and is associated with steroidogenic dysfunction.
