OCT4 Represses Inflammation and Cell Injury During Orchitis by Regulating CIP2A Expression

Area of Science:

• Reproductive biology
• Immunology
• Molecular biology

Background:

• Octamer-binding transcription factor 4 (OCT4) and cancerous inhibitor of protein phosphatase 2A (CIP2A) are known to be upregulated in testicular cancer.
• Their specific roles in orchitis, a condition of testicular inflammation, remain largely unexplored.

Purpose of the Study:

• To investigate the contribution of OCT4 and CIP2A to lipopolysaccharide (LPS)-induced orchitis.
• To elucidate the underlying molecular mechanisms involving the Keap1-Nrf2-HO-1 signaling pathway.

Main Methods:

• Establishment of a lipopolysaccharide (LPS)-induced orchitis mouse model.
• Analysis of OCT4 and CIP2A expression levels using real-time quantitative PCR.
• Gain-of-function studies involving OCT4 overexpression and CIP2A inhibition (using TD-19).
• Assessment of inflammation, apoptosis, and redox balance in testicular cells.

Main Results:

• LPS-induced orchitis model exhibited significant inflammation, apoptosis, and redox disorder.
• Low levels of OCT4 and CIP2A were observed in testicular tissue and LPS-stimulated cells.
• OCT4 overexpression upregulated CIP2A and suppressed LPS-induced inflammation, apoptosis, and redox disorder.
• Inhibition of CIP2A reversed the protective effects of OCT4 overexpression.
• The Keap1-Nrf2-HO-1 signaling pathway was found to be modulated by OCT4 and CIP2A.

Conclusions:

• OCT4 and CIP2A play a protective role against testicular inflammation and associated cellular damage.
• The findings highlight a potential therapeutic strategy targeting OCT4 and CIP2A for managing orchitis.