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KMID : 1225720240160010022
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Allergy, Asthma & Immunology Research : AAIR
2024 Volume.16 No. 1 p.22 ~ p.41
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ST2-Mediated Neutrophilic Airway Inflammation: A Therapeutic Target for Patients With Uncontrolled Asthma
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Quang Luu Quoc
Thi Bich Tra Cao
Jang Jae-Hyuk
Shin Yoo-Seob
Choi Young-Woo
Park Hae-Sim
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Abstract
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Purpose: Suppression of tumorigenicity 2 (ST2) has been proposed as the receptor contributing to neutrophilic inflammation in patients with type 2-low asthma. However, the exact role of ST2 in neutrophil activation remains poorly understood.
Methods: A total of 105 asthmatic patients (classified into 3 groups according to control status: the controlled asthma [CA], partly-controlled asthma [PA], and uncontrolled asthma [UA] groups), and 104 healthy controls were enrolled to compare serum levels of soluble ST2 (sST2) and interleukin (IL)-33. Moreover, the functions of ST2 in neutrophils and macrophages (Mφ) were evaluated ex vivo and in vivo.
Results: Serum sST2 levels were significantly higher in the UA group than in the CA or PA groups (P < 0.05 for all) with a
negative correlation between serum sST2 and forced expiratory volume in 1 second % (r = ?0.203, P = 0.038). Significantly higher expression of ST2 receptors on peripheral neutrophils was noted in the UA group than in the PA or CA groups. IL-33 exerted its effects on the production of reactive oxygen species, the formation of extracellular traps from neutrophils, and Mφ polarization/activation. In neutrophilic asthmatic mice, treatment with anti-ST2 antibody significantly suppressed proinflammatory cytokines (tumor necrosis factor-alpha and IL-17A) as well as the numbers of immune cells (neutrophils, Mφ, and group 3 innate lymphoid cells) in the lungs.
Conclusions: These results suggest that IL-33 induces the activation of neutrophils and Mφ via ST2 receptors, leading to neutrophilic airway inflammation and poor control status of asthma. ST2 could be a therapeutic target for neutrophilic airway inflammation in patients with UA.
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KEYWORD
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Asthma, IL-33, IL1RL1 protein, neutrophils, macrophages, cytokines, inflammation, therapeutics
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