Abstract
Rheumatoid arthritis (RA) is an autoimmune and inflammatory disease with strong genetic influence, especially upon immune response components. Several cytokines from the toll-like receptors activation pathway display recognized role for RA establishment. However, few studies have verified the role of key mediators such as MYD88 gene and its genetic variants. In the present study, we aim to evaluate the rs6853 functional single-nucleotide variation (SNV) role in RA etiopathogenesis, clinical severity status, and its impact in MYD88 mRNA levels and IL-lβ protein levels. For the association study, a total of 423 RA patients and 346 health individuals, enrolled as control, from Northeast and Southeast Brazil were genotyped using specific Taqman probe. For the gene expression assays, we performed a MYD88 rs6853 genotype-guided monocyte cell culture divided into non-stimulated and lypopolysaccharides (LPS)-stimulated cells from healthy individuals. MYD88 gene expression was measured using primer specifics while IL-1β levels were evaluated by ELISA. We observed that A allele and AA genotype were associated to an increased risk to RA development (OR = 1.60; 95% CI 1.24–2.08; p = 0.0004/OR = 2.83; 95% CI 1.25–6.41; p = 0.0152). The AA genotype exhibited lower MYD88 mRNA levels than GG genotype in non-stimulated monocyte cell culture (FC − 3.83; p = 0.003). Additionally, we verified an increase of IL-1β levels when AA genotype non-stimulated monocytes were compared to AA genotype LPS-stimulates (p = 0.021). In summary, MYD88 rs6853 polymorphism associated to RA development in our Brazilian cohort and showed influence upon MYD88 mRNA levels’ expression and IL-lβ production.
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This work was supported by Coordenação de Aperfeiçoamento de Pessoal de Nivel Superior (CAPES), Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), and Fundação de Amparo a Ciência e Tecnologia do Estado de Pernambuco (FACEPE).
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All authors contributed to the study conception and design. Material preparation, and data collection were performed by Silva JEA, Rushansky E, Mariano MHQA, Rolim P, Oliveira RDR, and Louzada-Júnior P, and analysis were performed by Gomes-Silva IIF, Lima CA, and Silva JEA. The first draft of the manuscript was written by Gomes-Silva IIF and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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This study was approved by Research Ethics Committee of the Federal University of Pernambuco (CAAE 43318215.9.0000.5208; CAAE 34636013.9.0000.5208).
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Gomes da Silva, I.I.F., Lima, C.A.D., Silva, J.E.A. et al. Is there an Inflammation Role for MYD88 in Rheumatoid Arthritis?. Inflammation 44, 1014–1022 (2021). https://doi.org/10.1007/s10753-020-01397-5
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DOI: https://doi.org/10.1007/s10753-020-01397-5