Direct vagus nerve stimulation: A new tool to control allergic airway inflammation through α7 nicotinic acetylcholine receptor
Résumé
Abstract Background and Purpose Asthma is characterized by airway inflammation, mucus hypersecretion, and airway hyperresponsiveness. The use of nicotinic agents to mimic the cholinergic anti‐inflammatory pathway (CAP) controls experimental asthma. Yet, the effects of vagus nerve stimulation (VNS)‐induced CAP on allergic inflammation remain unknown. Experimental Approach BALB/c mice were sensitized and challenged with house dust mite (HDM) extract and treated with active VNS (5 Hz, 0.5 ms, 0.05–1 mA). Bronchoalveolar lavage (BAL) fluid was assessed for total and differential cell counts and cytokine levels. Lungs were examined by histopathology and electron microscopy. Key Results In the HDM mouse asthma model, VNS at intensities equal to or above 0.1 mA (VNS 0.1) but not sham VNS reduced BAL fluid differential cell counts and alveolar macrophages expressing α7 nicotinic receptors (α7nAChR), goblet cell hyperplasia, and collagen deposition. Besides, VNS 0.1 also abated HDM‐induced elevation of type 2 cytokines IL‐4 and IL‐5 and was found to block the phosphorylation of transcription factor STAT6 and expression level of IRF4 in total lung lysates. Finally, VNS 0.1 abrogated methacholine‐induced hyperresponsiveness in asthma mice. Prior administration of α‐bungarotoxin, a specific inhibitor of α7nAChR, but not propranolol, a specific inhibitor of β2‐adrenoceptors, abolished the therapeutic effects of VNS 0.1. Conclusion and Implications Our data revealed the protective effects of VNS on various clinical features in allergic airway inflammation model. VNS, a clinically approved therapy for depression and epilepsy, appears to be a promising new strategy for controlling allergic asthma.
Mots clés
BGTX
α-bungarotoxin AM
alveolar macrophages BAL
bronchoalveolar lavage CAP
cholinergic anti-inflammatory pathway Cdyn
dynamic compliance HDM
house dust mite α7nAChR
α7 nicotinic acetylcholine receptor NMUR1
neuromedin U receptor 1 R L
lung resistance TEM
transmission electron microscopy TRP
transient receptor potential VNS
vagus nerve stimulation
α-bungarotoxin
AM
alveolar macrophages
BAL
bronchoalveolar lavage
CAP
cholinergic anti-inflammatory pathway
Cdyn
dynamic compliance
HDM
house dust mite
α7nAChR
α7 nicotinic acetylcholine receptor
NMUR1
neuromedin U receptor 1
R L
lung resistance
TEM
transmission electron microscopy
TRP
transient receptor potential
VNS
Domaines
Sciences du Vivant [q-bio]
Fichier principal
British J Pharmacology - 2024 - Sévoz‐Couche - Direct vagus nerve stimulation A new tool to control allergic airway.pdf (7.63 Mo)
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