[No authors listed]
Endometriosis is a painful gynecological disease with no cure and limited therapeutic options. It has been hypothesized that epigenetic drugs can be used as a nonhormonal treatment for endometriosis. This study was conducted to study the efficacy of an inhibitor of the histone methyltransferase EZH2 using an established rat model of endometriosis. We hypothesized that treatment will block or reduce the number of endometriotic vesicles in this model. We conducted a preclinical drug study in female rats with experimental endometriosis (uterine tissue transplanted next to the intestinal mesentery) or control sham (sutures only). Rats with endometriosis or sham surgery received either treatment with EZH2 inhibitor (5Â mg/kg or 10Â mg/kg) or vehicle (0.1%, 67% DMSO) every other day during 4Â weeks. After treatment completion, the number, area, volume, and weight of vesicles were evaluated. RT [2] Profiler Arrays for neuropathic and inflammation, epithelial to mesenchymal transition, inflammatory response, and autoimmunity pathways were used to examine gene expression changes in the vesicles that developed. Treatment with EZH2 inhibitor (10Â mg/kg) suppressed the development of vesicles, by significantly decreasing the total vesicle number, area, volume, and weight. In addition, EZH2 inhibition significantly increased the expression of CACNA1B and FKBP1A genes, involved in pain and proliferation, respectively. EZH2 inhibition suppresses the growth of vesicles without apparent detrimental effects to other organs. Treatment with this epigenetic inhibitor leads to upregulation of a limited number of genes related to endometriosis-relevant pathways. In conclusion, these data support follow-up studies to evaluate its potential as a therapeutic approach for endometriosis.
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