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Micro RNA-19a interferes with IL-10 expression in peripheral dendritic cells of patients with nasal polyposis
Xiang-Qian Luo1,2, Jian-Bo Shao1,2, Rui-Di Xie2
1Department of Otolaryngology, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou 510010, China.
Abstract:
The pathogenesis of nasal polyp is to be further investigated. Micro RNA (miR) plays a role in the development of allergic inflammation. Interleukin (IL)-10-producing dendritic cells (DC) have immune tolerogenic properties. This study test a hypothesis that miR-17-92 cluster is associated with suppressing IL-10 in peripheral DC. In this study, peripheral blood samples were obtained from 26 patients with nasal polyp. The CD11c DCs were isolated from the blood samples and analyzed for the expression of IL-10. We observed that, as compared with healthy subjects, the IL-10 expression in peripheral DC was significantly lower in polyp patients. The levels of miR-19a, but not the rest 5 members of the miR-17-92 cluster, were markedly higher in DCs in polyp group. Exposure to recombinant IL-4 suppressed the IL-10 expression in DCs, which was abolished by blocking histone deacetylase-11 or knocking down the miR-19a gene in DCs. We conclude that miR-19a plays a critical role in the suppression of IL-10 in peripheral DCs, which may be a target in the immune therapy for nasal polyp.
Insights
MicroRNA-19a (miR-19a) may suppress interleukin-10 (IL-10) in dendritic cells (DCs) of nasal polyp patients. This finding suggests miR-19a could be a therapeutic target for treating nasal polyps.
Area of Science:
- Immunology
- Molecular Biology
- Otorhinolaryngology
Background:
- Nasal polyps involve allergic inflammation, where microRNAs (miRs) and interleukin-10 (IL-10) producing dendritic cells (DCs) play roles.
- IL-10-producing DCs possess immune-tolerogenic properties, crucial for regulating immune responses.
- The specific role of the miR-17-92 cluster in modulating IL-10 expression in DCs within the context of nasal polyps requires investigation.
Purpose of the Study:
- To investigate the association between the miR-17-92 cluster and the suppression of IL-10 in peripheral DCs from patients with nasal polyps.
- To determine the role of specific microRNAs within the miR-17-92 cluster in regulating IL-10 expression in DCs.
- To explore potential therapeutic targets for nasal polyp treatment by understanding the underlying molecular mechanisms.
Main Methods:
- Peripheral blood samples were collected from 26 nasal polyp patients and healthy controls.
- CD11c+ dendritic cells (DCs) were isolated and analyzed for IL-10 expression.
- Expression levels of miR-17-92 cluster members, particularly miR-19a, were quantified in DCs.
- Functional assays involved exposure to IL-4, blocking histone deacetylase-11, and miR-19a gene knockdown.
Main Results:
- Nasal polyp patients exhibited significantly lower IL-10 expression in peripheral DCs compared to healthy subjects.
- Levels of miR-19a were markedly elevated in DCs from nasal polyp patients, while other miR-17-92 cluster members showed no significant difference.
- Interleukin-4 (IL-4) suppressed DC IL-10 expression, an effect reversed by blocking histone deacetylase-11 or knocking down miR-19a.
Conclusions:
- miR-19a plays a critical role in suppressing IL-10 expression in peripheral DCs.
- The elevated miR-19a in nasal polyp patients' DCs may contribute to reduced immune tolerance.
- Targeting miR-19a presents a potential immunotherapeutic strategy for managing nasal polyps.