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Updated: Sep 3, 2025

Myeloid Innate Signaling Pathway Regulation by MALT1 Paracaspase Activity
Published on: January 7, 2019
RNA-binding protein RBM3 intrinsically suppresses lung innate lymphoid cell activation and inflammation partially
Jana H Badrani1, Allyssa N Strohm1,2, Lee Lacasa1
1Divison of Rheumatology, Allergy and Immunology, Department of Medicine, University of California San Diego, La Jolla, CA, USA.
RNA-binding motif 3 (RBM3) suppresses lung innate lymphoid cell (ILC) responses in asthma. Loss of RBM3 enhances ILC activation and allergic lung inflammation, partly via cysteinyl leukotriene 1 receptor (CysLT1R).
Area of Science:
- Immunology
- Molecular Biology
- Respiratory Medicine
Background:
- Innate lymphoid cells (ILCs) drive asthma pathogenesis via cytokine release.
- RNA-binding proteins (RBPs) regulate gene expression but their role in ILCs is understudied.
- RNA-binding motif 3 (RBM3) is a key RBP with largely unknown functions in lung immunity.
Purpose of the Study:
- To investigate the role of RBM3 in regulating lung ILC function during allergic inflammation.
- To determine if RBM3 acts intrinsically within ILCs to control inflammatory responses.
- To identify downstream pathways regulated by RBM3 in ILCs.
Main Methods:
- Analysis of RBM3 expression in lung ILCs from wild-type and asthma model mice.
- Utilizing Rbm3 knockout (Rbm3-/-) and Rbm3-/-Rag2-/- mice in an Alternaria-induced asthma model.
- Investigating ILC responses following IL-33 stimulation in vivo and in vitro.
- Performing RNA-sequencing on Rbm3-/- lung ILCs.
- Examining Rbm3-/-Cyslt1r-/- double knockout mice.
Main Results:
- RBM3 is highly expressed in lung ILCs and induced by alarmins TSLP and IL-33.
- Rbm3 deficiency exacerbates eosinophilic lung inflammation and ILC activation in asthma models.
- RBM3 suppresses ILC cytokine production intrinsically.
- RNA-seq revealed increased type 2/17 cytokines and CysLT1R expression in Rbm3-/- ILCs.
- Allergen-induced accumulation of ST2+IL-17+ ILCs is partially dependent on CysLT1R in Rbm3-/- mice.
Conclusions:
- RBM3 acts as an intrinsic suppressor of lung ILC responses in allergen-induced type 2 inflammation.
- RBM3-mediated regulation of ILCs involves modulation of cytokine expression and CysLT1R.
- Targeting RBM3 or its downstream pathways may offer novel therapeutic strategies for asthma.
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