Journal
AMERICAN JOURNAL OF PHYSIOLOGY-LUNG CELLULAR AND MOLECULAR PHYSIOLOGY
Volume 323, Issue 1, Pages L27-L36Publisher
AMER PHYSIOLOGICAL SOC
DOI: 10.1152/ajplung.00468.2021
Keywords
airway hyperresponsiveness; Ca(v)1.2; IL-25; tracheal smooth muscle
Categories
Funding
- National Natural Science Foundation of China [81802031, 31771286]
- Natural Science Foundation of Guangdong Province [2018A030310074]
- Social Science and Technology Research Project of Zhongshan Grant [2018B1001]
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IL-25 enhances tracheal smooth muscle contraction and induces airway hyperresponsiveness via the TPL2-ERK1/2-Ca(v)1.2 signaling pathway, providing novel targets for the treatment of asthma with a high-IL-25 phenotype.
Asthma is a common heterogeneous respiratory disease characterized by airway inflammation and airway hyperresponsiveness (AHR) which is associated with abnormality in smooth muscle contractility. The epithelial cell-derived cytokine IL-25 is implicated in type 2 immune pathology including asthma, whereas the underlying mechanisms have not been fully elucidated. This study aims to investigate the effects of IL-25 on mouse tracheal smooth muscle contractility and elucidate the cellular mechanisms. Incubation with IL-25 augmented the contraction of mouse tracheal smooth muscles, which could be suppressed by the L-type voltage-dependent Ca2+ channel (L-VDCC) blocker nifedipine. Furthermore, IL-25 enhanced the cytosolic Ca2+ signals and triggered the upregulation of alpha 1C L-VDCC (Ca(v)1.2) in primary cultured mouse tracheal smooth muscle cells. Knocking down IL-17RA/IL-17RB receptors or inhibiting the transforming growth factor-beta-activated kinase 1 (TAK1)-tumor progression locus 2 (TPL2)-MAPK kinase 1/2 (MEK1/2)-ERK1/2-activating protein-1 (AP-1) signaling pathways suppressed the IL-25-elicited upregulation of Ca(v)1.2 and hyperreactivity in tracheal smooth muscles. Moreover, inhibition of TPL2, ERK1/2 or L-VDCC alleviated the AHR symptom induced by IL-25 in a murine model. This study revealed that IL-25 potentiated the contraction of tracheal smooth muscle and evoked AHR via activation of TPL2-ERK1/2-Ca(v)1.2 signaling, providing novel targets for the treatment of asthma with a high-IL-25 phenotype.
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