半乳凝素9在小鼠过敏性炎症和气道高反应性中的作用
2010/02/23
背景:半乳凝素9(Gal-9)是β半乳糖苷结合凝集素家族成员之一。Gal-9是嗜酸性粒细胞趋化因子和Th1细胞凋亡诱导因子。Gal-9的上述作用显示其可能参与了哮喘的致病。本实验在卵清蛋白(OVA)诱导的过敏性哮喘小鼠模型中检测Gal-9表达。
方法:为研究Gal-9在过敏性炎症和气道高反应性(AHR)中的作用,一组BALB/c小鼠采用卵清蛋白致敏(OVA)(GOVA),另一组小鼠除OVA致敏外,同时采用地塞米松治疗(DEX)(GOVA+DEX)。对照组(G(PBS))注射膦酸盐缓冲液作为安慰剂。检测静脉注射乙酰甲胆碱后的气道反应性。
结果:采用流式细胞仪检测支气管肺泡灌洗液(BAL)中Gal-9阳性细胞的百分比和这些细胞内Gal-9含量,以及Th1/Th2细胞因子水平。取肺组织采用实时RT-PCR(逆转录多聚酶联反应)和Western blot检测Gal-9 mRNA表达和蛋白含量。GOVA小鼠显示气道炎症和粘液过度分泌。DEX治疗能显著抑制上述表现。GOVA+DEX或G(OVA+DEX )小鼠相比,GOVA小鼠BAL中Gal-9阳性淋巴细胞、嗜酸性粒细胞和中性粒细胞数量及Th2细胞因子水平显著增加。此外,GOVA小鼠肺组织Gal-9蛋白含量也明显增加。
结论:上述结果显示,Gal-9作为介质之一,参与了过敏性哮喘的炎症的发生。Gal-9可能作为嗜酸性粒细胞趋化因子,并促进Th2细胞因子产生。
(苏楠 审校)
Int Arch Allergy Immunol. 2009 Oct 22;151(4):308-317.[Epub ahead of print]
Galectin-9 in Allergic Airway Inflammation and Hyper-Responsiveness in Mice.
Sziksz E, Kozma GT, Pállinger E, Komlósi ZI, Adori C, Kovács L, Szebeni B, Rusai K, Losonczy G, Szabó A, Vannay A.
Background: Galectin-9 (Gal-9) is a member of the growing family of beta-galactoside-binding lectins. Gal-9 is an eosinophil chemoattractant and inducer of Th1 cell apoptosis. These effects suggest its potential role in the pathogenesis of asthma. Our aim was to study the expression of Gal-9 in an ovalbumin (OVA)-induced mouse model of allergic asthma.
Methods: To investigate the significance of Gal-9 in allergic inflammation and airway hyperresponsiveness (AHR), a group of BALB/c mice was sensitized and challenged with OVA (G(OVA)). Another group of animals was allergized with OVA and also treated with dexamethasone (DEX) (G(OVA+DEX)). The control group (G(PBS)) received phosphate-buffered saline instead of OVA as placebo. Airway reactivity to intravenous methacholine was assessed.
Results: The percentage of Gal-9-positive cells and their intracellular Gal-9 content and Th1/Th2 cytokine levels in the bronchoalveolar lavage (BAL) were determined by flow cytometry. Gal-9 mRNA expression and protein level were measured in the lung tissue by real-time RT-PCR and Western blot. In G(OVA )mice, airway inflammation and mucus hypersecretion developed. DEX treatment inhibited the main features of experimental asthma. The number of Gal-9-positive lymphocytes, eosinophil and neutrophil granulocytes and the levels of Th2 cytokines were higher in the BAL of G(OVA) compared to G(PBS) or G(OVA+DEX )mice. Moreover, Gal-9 protein level was elevated in the lungs of G(OVA) mice.
Conclusions: These results suggest that Gal-9 plays a role as a mediator contributing to the development of allergic airway inflammation. Gal-9 may serve as a recruiter of eosinophil granulocytes and promoter of Th2 dominance
Int Arch Allergy Immunol. 2009 Oct 22;151(4):308-317.[Epub ahead of print]
上一篇:
在长期暴露于环境烟草烟雾和变应原的小鼠中,Toll样受体9激动剂抑制气道炎症、重构和高反应性
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小鼠哮喘模型中有氧训练逆转气道炎症和气道重构