Steroidogenic Effects of Korean Rice Bran Extract (Oryza sativa L.) on Mouse Normal Leydig Cells via Modulation of Steroidogenesis-Related Enzymes

Main Article Content

Hyun Joo Chung https://orcid.org/0000-0001-8741-1934
Jin-Wook Kim http://orcid.org/0000-0003-4157-9365
Chae-Eun Lee https://orcid.org/0000-0001-7016-3719
Soon Chul Myung https://orcid.org/0000-0002-6727-5450

Keywords

Korean rice bran extract (RBE); Oryza sativa L. ; medicinal plant; steroidogenesis; Late-onset hypogonadism (LOH)

Abstract

Background and objective
Many plant extracts have various effects on diseases. In particular, some medicinal plants have been shown to have steroidogenic effects in men. However, the effects of Korean rice bran extract (RBE) on steroidogenesis in men have not been reported previously. Accordingly, in this study, we investigated the effects of RBE (Oryza sativa L.) on mouse normal Leydig cells (TM3), which produce testosterone with increasing levels of key enzymes (e.g., StAR, CYP11A1, and CYP17A1) for male steroidogenesis.


Material and methods
Using mouse normal Leydig cells (TM3), we determined whether RBE had steroidogenic effects by evaluating changes in the levels of steroidogenesis-related enzymes, such as StAR (steroidogenic acute regulatory protein), CYP11A1, and CYP17A1, using quantitative real-time PCR, western blotting analysis, and ELISA method.


Results
RBE significantly enhanced mRNA and protein levels of StAR, CYP11A1, and CYP17A1, thereby enhancing synthetic testosterone levels in mouse Leydig TM3 cell supernatants. These findings indicated that RBE increased the levels of steroidogenic enzymes to modulate steroidogenesis.


Conclusion
RBE enhanced mRNA and protein levels of key enzymes including StAR, CYP11A1, and CYP17A1 for male steroidogenesis. These changes could induce testosterone production by TM3 cells in vitro. Thus, RBE may be used as a food additive or medicinal plant for the treatment of diseases characterized by insuf-ficient testosterone (e.g., late-onset hypogonadism).

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