Expression of membrane progesterone receptors in eutopic and ectopic endometrium of women with endometriosis

Edgar Ricardo Vázquez-Martínez, Claudia Bello‐Alvarez, Ana Lorena Hermenegildo-Molina, Juan Mario Solis-Paredes, Sandra Parra-Hernández, Oliver Cruz-Orozco, José Roberto Silvestri-Tomassoni, Luis Fernando Escobar-Ponce, Luis A. Hernández-López, Christian Reyes-Mayoral, Andrea Olguín-Ortega, Brenda Sánchez-Ramírez, Mauricio Osorio‐Caballero, Elizabeth García-Gómez, Guadalupe Estrada‐Gutiérrez, Marco Cerbón, Ignacio Camacho‐Arroyo
In: Research Square · 2020 · doi:10.21203/rs.2.22812/v1 · W4254373969
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⚙ AI-generated summary by claude@2026-06, 2026-06-08 ⓘ

This study found decreased mRNA and protein expression of membrane progesterone receptors (mPRs) in eutopic and ectopic endometrium of women with endometriosis compared to controls.

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⚙ AI-generated deep summary by claude@2026-06, 2026-06-09 ⓘ

This study evaluated mRNA and protein expression of membrane progesterone receptors from the PAQR family (PAQR7/mPRα, PAQR8/mPRβ, PAQR5/mPRγ, and PAQR6/mPRδ) in endometrium from women with ovarian endometriosis (eutopic and ectopic tissues) versus endometrium from women without endometriosis (controls) using RT-qPCR and western blot. The authors found that PAQR7 and PAQR5 transcripts were reduced in both eutopic and ectopic endometrium of patients, while PAQR8 and PAQR6 were reduced only in eutopic endometrium, and mPRα and mPRβ protein content was decreased in ectopic endometrium. A major caveat explicitly stated in the paper is that results come from a limited number of ectopic samples (9) and were assessed without detailed differentiation beyond tissue type and largely proliferative-phase sampling. This paper is centrally about endometriosis — it measures altered membrane progesterone receptor expression in eutopic and ectopic endometrium of women with endometriosis, relating these changes to progesterone resistance.

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Abstract

Abstract Background: Endometriosis is one of the most frequent gynecological diseases in reproductive age women, but its etiology is not completely understood. Endometriosis is characterized by progesterone resistance, which has been explained in part by a decrease in the expression of the intracellular progesterone receptor in the ectopic endometrium. Progesterone action is also mediated by non-genomic mechanisms via membrane progesterone receptors that belong to the class II members of the progesterone and adipoQ receptor (PAQR) family. The aim of the present study was to evaluate the expression at mRNA and protein levels of PAQR family members in the eutopic and ectopic endometrium of women with endometriosis. Methods: Total RNA and total protein were isolated from control endometrium (17 samples), eutopic endometrium (17 samples), and ectopic endometrium (9 samples). The expression of PAQR7 ( mPRα ) , PAQR8 , (mPRβ) PAQR5 ( mPRγ ) , and PAQR6 ( mPRδ ) at mRNA and protein levels was evaluated by RT-qPCR and western blot. Statistical analysis between comparable groups was performed using one-way ANOVA followed by Tukey's multiple comparisons test with a confidence interval of 95%. Results: The analysis of gene expression showed that PAQR7 and PAQR5 expression was lower in both eutopic and ectopic endometrium as compared to the endometrium of women without endometriosis, whereas the expression of PAQR8 and PAQR6 was only reduced in eutopic endometrium. Furthermore, mPRα and mPRβ protein content was decreased in the ectopic endometrium of women with endometriosis. Conclusions: Our results demonstrate a decrease in the expression and protein content of mPRs in eutopic and ectopic endometrium of patients with endometriosis, which could contribute to the progesterone resistance observed in patients with this disease.

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endometriosis

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