Brazilian Journal of Pain
https://brjp.org.br/article/doi/10.5935/2595-0118.20220056-en
Brazilian Journal of Pain
Original Article

Methylation of the NR3C1 gene in individual with chronic pain: patient profile in a cross-sectional study with users of the public health system

Metilação do gene NR3C1 em indivíduos com dor crônica: perfil de pacientes em estudo transversal com usuários do sistema público de saúde 

Alexandre Lima Castelo-Branco; Tamires dos Santos Vieira; Flávia Vitorino Freitas; Júlia Assis Pinheiro; Iuri Drumond Louro; Adriana Maria Álvares-da-Silva

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Abstract

BACKGROUND AND OBJECTIVES: Studies suggest that shared molecular factors can simultaneously affect different chronic pain syndromes. Understanding the epigenetic mechanisms of various diseases that are associated with chronic pain is essential to comprehend its appearance and progression. The objective of this study is to evaluate the association between DNA methylation of the NR3C1 gene with the presence and intensity of chronic pain, as well as predictive factors also considering socioeconomic, health and lifestyle factors correlated with this association, in adult individuals using the Brazilian Unified Health System (Sistema Único de Saúde - SUS) in a municipality in Southeast Brazil. 
METHODS: This is a cross-sectional study, whose data collection was carried out through interviews to investigate socioeconomic status, lifestyle and health conditions, in addition to anthropometric assessments and blood samples. Data were analyzed by quantitative DNA methylation assays and statistical analysis. 
CONCLUSION: The findings suggest epigenetic involvement in NR3C1 gene methylation in association with chronic pain and suggest the need to seek new evidence in relation to the mechanisms that explain chronic pain, especially from an epigenetic point of view, as they may provide subsidies for the prevention and control of chronic pain targeting individuals with the profile found in this study. 
HIGHLIGHTS
• Suggests epigenetic involvement in association with chronic pain.
• Identifies the profile of individuals affected by chronic pain.
• Evidence subsidies for the prevention and control of chronic pain.

Keywords

Chronic pain, DNA methylation, Life style, Socioeconomic factors.

Resumo

JUSTIFICATIVA E OBJETIVOS: Estudos sugerem que fatores moleculares compartilhados podem afetar simultaneamente diferentes síndromes de dor crônica. Compreender os mecanismos epigenéticos de várias doenças que estão associadas à dor crônica é essencial para entender sua aparência e progressão. O objetivo deste estudo foi avaliar a associação entre metilação do DNA do gene NR3C1, receptor de glicocorticoides, com a presença e intensidade de dor crônica, bem como os fatores preditivos considerando também fatores socioeconômicos, de saúde e de estilo de vida correlacionados com tal associação em pacientes adultos usuários do Sistema Único de Saúde (SUS) em um município do sudeste brasileiro. 
MÉTODOS: Trata-se de um estudo observacional transversal, cuja coleta de dados foi realizada através de entrevistas para investigação do status socioeconômico, condições de estilo de vida e de saúde, além de avaliações antropométricas e coletas de sangue. Os dados foram analisados por meio de ensaios quantitativos de metilação do DNA e análise estatística. 
RESULTADOS: Foi observado que 123 participantes (44,1%) apresentaram metilação da região estudada do gene NR3C1. Análises estatísticas univariadas e multivariada mostraram que as variáveis idade e nível de cortisol estão significativamente associadas com a metilação do gene e a presença de dor crônica. 
CONCLUSÃO: Os achados sugerem envolvimento epigenético na metilação do gene NR3C1 em associação com dor crônica e sugerem a necessidade de se buscar novas evidências em relação aos mecanismos que explicam a dor crônica, sobretudo do ponto de vista epigenético, pois as mesmas poderão trazer subsídios para prevenção e controle da dor crônica visando pacientes com o perfil encontrado nesse estudo.
DESTAQUES
• Sugere envolvimento epigenético em associação com dor crônica.
• Identifica perfil de indivíduos acometidos por dor crônica.
• Evidencia subsídios para prevenção e controle da dor crônica.

Palavras-chave

Dor crônica, DNA metilação, Estilo de vida, Fatores socioeconômicos.

References

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Submitted date:
08/02/2022

Accepted date:
11/15/2022

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