儿童肥胖型哮喘发病机制的研究

Research on the Pathogenesis of Childhood Obese Asthma

摘要: 目的：肥胖型哮喘是儿童哮喘的独立表型，症状多、控制差、发作频、病情重且对激素治疗不敏感，严重影响生活质量。其发病机制尚不明确，本文从多角度综述儿童肥胖型哮喘的潜在机制，为防治提供理论依据。方法：系统检索并梳理国内外相关文献，汇总已有研究成果。结果：可能机制涉及五方面：1. 机械因素：胸腹脂肪过多限制膈肌及胸廓运动，降低肺顺应性，致气道口径与肺实质不匹配，引起功能残气量等指标下降。2. 炎症机制：肥胖呈慢性低度炎症，脂肪因子(瘦素升高、脂联素降低)及促炎细胞因子(IL-1β、IL-6等)异常，促进气道炎症与纤维化。3. 免疫机制：单核–巨噬、Treg、Th1/Th2/Th17等细胞参与，瘦素调节T细胞及巨噬细胞活性，影响气道免疫。4. 肠道微生态：肠道菌群代谢产物(如短链脂肪酸)可改善过敏反应、调节Th平衡；肠道屏障功能亦减轻肺部炎症。5. 遗传代谢：肥胖与哮喘共享多个易感基因(如LEP、β受体等)，胰岛素抵抗、维生素D缺乏等代谢因素亦相关。结论：儿童肥胖型哮喘是多机制交互的复杂疾病，具体路径仍未完全阐明，部分结果存在分歧，且现有研究多依赖BMI，难以反映肥胖异质性。未来需结合多元分类标准和多学科方法，深入探索病理生理，以推进精准治疗，改善患儿预后。

Abstract: Objective: Obese asthma is an independent phenotype of childhood asthma characterized by numerous symptoms, poor control, frequent exacerbations, severe disease course, and insensitivity to corticosteroid therapy, all of which significantly impair quality of life. Its pathogenesis remains unclear. This article reviews the potential mechanisms of childhood obese asthma from multiple perspectives to provide a theoretical basis for its prevention and treatment. Methods: Relevant domestic and international literature was systematically retrieved and reviewed to summarize existing research findings. Results: The potential mechanisms involve five aspects: 1. Mechanical factors: Excessive thoracoabdominal fat restricts diaphragmatic and chest wall movement, reduces lung compliance, causes a mismatch between airway caliber and lung parenchyma, and leads to a decrease in functional residual capacity and other indicators. 2. Inflammatory mechanisms: Obesity presents as a state of chronic low-grade inflammation. Abnormalities in adipokines (elevated leptin, decreased adiponectin) and pro-inflammatory cytokines (IL-1β, IL-6, etc.) promote airway inflammation and fibrosis. 3. Immune mechanisms: Cells such as monocyte-macrophages, Tregs, and Th1/Th2/Th17 cells are involved. Leptin regulates T cell and macrophage activity, thereby affecting airway immunity. 4. Gut microbiota: Metabolites of gut flora (e.g., short-chain fatty acids) can ameliorate allergic responses and regulate Th balance; intestinal barrier function also helps alleviate pulmonary inflammation. 5. Genetics and metabolism: Obesity and asthma share multiple susceptibility genes (e.g., LEP, β-adrenergic receptors). Metabolic factors such as insulin resistance and vitamin D deficiency are also associated with the condition. Conclusion: Childhood obese asthma is a complex disease involving the interaction of multiple mechanisms. The specific pathways have not yet been fully elucidated, and some findings remain controversial. Furthermore, current studies largely rely on BMI, which fails to reflect the heterogeneity of obesity. Future research should integrate diverse classification criteria and multidisciplinary approaches to deeply explore the pathophysiology, aiming to advance precision medicine and improve patient prognosis.