Peritoneal Modulators of EZH2-miR-155 Cross-Talk in Endometriosis

Sarah Brunty, Kristeena Ray Wright, K. Wright, Brenda Mitchell, Nalini Santanam
International journal of molecular sciences · 2021 · vol. 22(7) , pp. 3492 · doi:10.3390/ijms22073492 · PMID:33800594 · W3144914663
article OA: gold CC0 ⤵ 12 in-corpus citations
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⚙ AI-generated summary by claude@2026-06, 2026-06-08 ⓘ

This study found that EZH2, miR-155, and PHF19 are differentially expressed and interact in endometriosis tissues and peritoneal fluid, suggesting a novel epigenetic pathway in the disease.

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Abstract

Activation of trimethylation of histone 3 lysine 27 (H3K27me3) by EZH2, a component of the Polycomb repressive complex 2 (PRC2), is suggested to play a role in endometriosis. However, the mechanism by which this complex is dysregulated in endometriosis is not completely understood. Here, using eutopic and ectopic tissues, as well as peritoneal fluid (PF) from IRB-approved and consented patients with and without endometriosis, the expression of PRC2 complex components, JARID2, miR-155 (known regulators of EZH2), and a key inflammatory modulator, FOXP3, was measured. A higher expression of EZH2, H3K27me3, JARID2, and FOXP3 as well as miR-155 was noted in both the patient tissues and in endometrial PF treated cells. Gain-or-loss of function of miR-155 showed an effect on the PRC2 complex but had little effect on JARID2 expression, suggesting alternate pathways. Chromatin immunoprecipitation followed by qPCR showed differential expression of PRC2 complex proteins and its associated binding partners in JARID2 vs. EZH2 pull down assays. In particular, endometriotic PF treatment increased the expression of PHF19 (p = 0.0474), a gene silencer and co-factor that promotes PRC2 interaction with its targets. Thus, these studies have identified the potential novel crosstalk between miR-155-PRC2 complex-JARID2 and PHF19 in endometriosis, providing an opportunity to test other epigenetic targets in endometriosis.

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Condition tags

mesh:D004715endometriosis

MeSH descriptors

Ascitic Fluid Endometriosis Endometrium Enhancer of Zeste Homolog 2 Protein Gene Expression Regulation MicroRNAs Adolescent Adult Ascitic Fluid DNA Methylation Endometriosis Endometrium Enhancer of Zeste Homolog 2 Protein Female Forkhead Transcription Factors Forkhead Transcription Factors Gene Expression Profiling Humans Methylation MicroRNAs

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References (81)

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