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学科主题: 临床医学
题名:
Effects of epithelial cell injury of the lower respiratory tract in the pathogenesis of allergic responses in a rat model
作者: Chu Wei-li1; Chu Ming; Wang Yue-dan; Hu Yan1; Zhao Can1; Su Li1; Xiong Yan2; Yang Tong-sheng3; Tao Ying-hong3; Li Hai-chao1
关键词: asthma ; airway epithelium ; environmental injury ; pathogenesis
刊名: CHINESE MEDICAL JOURNAL
发表日期: 2013-01-05
DOI: 10.3760/cma.j.issn.0366-6999.20121915
卷: 126, 期:1, 页:72-77
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology
类目[WOS]: Medicine, General & Internal
研究领域[WOS]: General & Internal Medicine
关键词[WOS]: THYMIC STROMAL LYMPHOPOIETIN ; ASTHMA ; EXPRESSION ; DISEASE ; INFLAMMATION ; TSLP ; CHEMOKINES ; EXPOSURE ; RHINITIS ; IMMUNITY
英文摘要:

Background Asthma is a complex disease involving genetic and environment interactions. Atopy is a strong risk factor for asthma. The airway epithelium not only forms a physical barrier but also provides immune defense against harmful materials. To explore the effects of airway epithelium on asthma, we hypothesized that environmental injuries could act on bronchial epithelial cells and damage the physical barrier, which might facilitate allergens to stimulate immunoreactions and play an important role in the pathogenesis of asthma.

Methods Thirty eight-week-old male Wistar rats were randomly divided into five groups with six rats in each group: control group, asthma group, ovalbumin (OVA)+OVA group, lipopolysaccharide (LPS) group and LPS+OVA group. In the control group, 0.9% saline was injected intraperitoneally on day 1. Fourteen days later, the rats were exposed to aerosolized 0.9% saline. In the asthma group, the rats were sensitized with an injection of 10 mg of OVA, followed by an aerosolized 2% OVA challenge14 days later. The OVA+OVA group was sensitized by an inhalation 2% OVA, 20 minutes a day, from day 1 to day 7, and then OVA challenged in the same way as the asthma group. In the LPS group, LPS (200 mu l, 1 mu g/mu l) was given by airway on day 1 and day 3, with a simultaneous aerosol inhalation of 2% OVA for 20 minutes a day from day 1 to day 7. Fourteen days later, the rats were challenged with saline as in the control group. While in the LPS+OVA group, LPS (200 mu l, 1 mu g/mu l) was given by airway on day 1 and day 3, with a simultaneous aerosol inhalation of 2% OVA for 20 minutes a day from day 1 to day 7. Fourteen days later, the rats were challenged with OVA as in the asthma group. The expression of interleukin (IL)-4, interferon-gamma (IFN-gamma) and thymic stromal lymphopoietin (TSLP) in the lungs was detected by reverse transcription polymerase chain reaction (RT-PCR) and the pulmonary pathological changes were also observed. The level of IL-4, IFN-gamma and IgE in plasma was detected by enzyme-linked immunosorbent assay (ELISA). Bronchoalveolar lavage fluid (BALF) was collected to conduct differential cell counts. Flow cytonnetry analysis was also used to count Th1 and Th2 cells.

Results The pathological changes in the LPS+OVA group were similar to the asthma group, while in other groups, the pathological changes were not obvious. The ratio of lymphocytes in BALF, IL-4/IFN-gamma in plasma and the expression of the TSLP and IL-4 in the asthma and LPS+OVA groups were higher than in the control group and the OVA+OVA group (P <0.05). The level of IgE was higher in the asthma, LPS and LPS+OVA groups than in the control group and the OVA+OVA group (P<0.05). By flow cytometry analysis, the Th1/Th2 ratio was lower in the LPS+OVA and asthma groups than in other groups (P<0.05).

Conclusions The experiment results show that the injury to the bronchial epithelial layer may be the initial event of allergic responses. This finding implies that a rational approach to therapeutics would be to increase the resistance of the airways to environmental injuries rather than concentrating on suppressing inflammation.

语种: 英语
WOS记录号: WOS:000319793700014
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.bjmu.edu.cn/handle/400002259/59389
Appears in Collections:北京大学第一临床医学院_呼吸和危重症医学科_期刊论文

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作者单位: 1.Peking Univ, Hosp 1, Dept Resp Med, Beijing 100034, Peoples R China
2.Peking Univ, Hosp 1, Dept Pathol, Beijing 100034, Peoples R China
3.Peking Univ, Hosp 1, Dept Anim Ctr, Beijing 100034, Peoples R China

Recommended Citation:
Chu Wei-li,Chu Ming,Wang Yue-dan,et al. Effects of epithelial cell injury of the lower respiratory tract in the pathogenesis of allergic responses in a rat model[J]. CHINESE MEDICAL JOURNAL,2013,126(1):72-77.
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