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MiR-221-3p Attenuates IL-33-Induced Mast Cell Cytokine Expression by Targeting KIT

Ruowu Liu1, Jiao Zhou2, Jing Zhou1

  • 1Department of Otolaryngology-Head and Neck Surgery, West China Hospital, Sichuan University, Chengdu, China.

International Forum of Allergy & Rhinology
|March 25, 2025
PubMed
Abstract

Insights

MicroRNA-221-3p inhibits mast cell activation and type 2 inflammation in chronic rhinosinusitis with nasal polyps (CRSwNP). This finding identifies miR-221-3p as a potential therapeutic target for CRSwNP.

Area of Science:

  • Immunology
  • Molecular Biology
  • Otorhinolaryngology

Background:

  • Mast cells (MCs) drive type 2 inflammation in chronic rhinosinusitis with nasal polyps (CRSwNP), a process influenced by interleukin-33 (IL-33).
  • MicroRNA-221 (miR-221) is implicated in MC regulation, with miR-221-3p detected in CRSwNP tissues, but its specific role remains unclear.

Purpose of the Study:

  • To investigate the role and mechanism of miR-221-3p in mast cells within the context of CRSwNP.
  • To determine if miR-221-3p modulates IL-33-induced mast cell activation and associated inflammatory responses.

Main Methods:

  • Quantitative PCR and western blotting to assess miR-221-3p, cytokine, and signaling pathway expression in CRSwNP tissues and human MCs.
  • In situ hybridization and immunofluorescence for miR-221-3p localization.
  • Luciferase reporter assays to identify miR-221-3p targets.
  • In vitro experiments using microRNA mimics/inhibitors and lentiviral vectors in IL-33-stimulated human MCs.

Main Results:

  • miR-221-3p expression was elevated in CRSwNP tissues and localized to MCs, negatively correlating with IL-4, IL-5, and IL-13.
  • IL-33 stimulation induced miR-221-3p in MCs, which then suppressed cytokine production and signaling pathways.
  • The receptor KIT, a direct target of miR-221-3p, was downregulated in CRSwNP and essential for MC response to IL-33, with miR-221-3p regulating cytokine expression via KIT targeting.

Conclusions:

  • MiR-221-3p acts as a negative regulator in CRSwNP by inhibiting MC-dependent type 2 inflammation.
  • Targeting miR-221-3p presents a potential therapeutic strategy for CRSwNP by modulating mast cell activity.
Keywords:
CRSwNPIL‐33KITmast cellmiR‐221‐3p

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