TNFα-Induced Altered miRNA Expression Links to NF-κB Signaling Pathway in Endometriosis

Area of Science:

• Gynecological pathology
• Molecular biology
• Immunology

Background:

• Endometriosis is a common inflammatory gynecological disorder linked to immune system dysregulation.
• Tumor necrosis factor-alpha (TNFα), a potent inflammatory cytokine, is implicated in endometriosis progression.
• MicroRNAs (miRNAs) play a role in cellular function and are potentially involved in endometriosis pathogenesis.

Purpose of the Study:

• To investigate the role of TNFα in dysregulating miRNAs associated with NFkB signaling pathways in endometriosis.
• To examine the therapeutic potential of curcumin (CUR) in modulating TNFα-induced miRNA changes and signaling pathways.

Main Methods:

• Quantification of miRNA expression using RT-qPCR in primary cells from endometriosis patients (EESC) and normal endometrial stromal cells (NESC).
• Treatment of NESCs with exogenous TNFα to assess dose-dependent effects on miRNA expression.
• Western blot analysis to measure the phosphorylation of NF-κB, PI3K, AKT, and ERK signaling pathways.
• Assessment of curcumin's effect on miRNA expression and signaling pathway phosphorylation in EESCs.

Main Results:

• Elevated TNFα in EESCs significantly downregulated specific miRNAs compared to NESCs.
• Exogenous TNFα treatment of NESCs mimicked the miRNA downregulation observed in EESCs.
• TNFα significantly increased the phosphorylation of PI3K, AKT, ERK, and NF-κB signaling pathways.
• Curcumin treatment dose-dependently increased miRNA expression and suppressed AKT, ERK, and NF-κB phosphorylation in EESCs.

Conclusions:

• Upregulated TNFα in endometriosis contributes to disease pathophysiology by dysregulating miRNA expression.
• TNFα activation of PI3K/AKT/ERK and NF-κB pathways is involved in endometriosis pathogenesis.
• Curcumin demonstrates therapeutic potential by inhibiting TNFα, restoring miRNA levels, and suppressing key signaling pathways.