过敏性哮喘小鼠气道结构细胞和炎症细胞的NPY和NPY受体
2012/08/28
摘要
目的:过敏性哮喘患者的气道内神经肽Y(NPY)水平增加,抗原提呈细胞(APC)上NPY受体-1(NPY-Y1)的活化是T细胞启动所必须的。但是,NPY-Y1能调节T细胞过度反应,表明APC和T细胞的NPY存在双模式作用。因此,阐明NPY及其受体在哮喘患者气道内的时空表达,有助于了解NPY在过敏性哮喘中的作用。
方法:OVA致敏和激发诱导过敏性哮喘。收集过敏性哮喘急性和慢性期以及正常小鼠的肺,行HE、PAS和三色染色评价肺病理严重程度。通过ELISA和免疫荧光分析评价气道内NPY和NPY-Y受体的表达形式。同时检测BALF内的细胞因子水平。
结果:对照小鼠BALF中NPY几乎检测不到,但在OVA组小鼠80天时NPY水平显著增加。OVA组小鼠的IL-4、TGF-β和TGF-β2也显著增加,在45天时达到峰值,80天时出现下降,这些细胞因子水平与NPY水平呈负相关。NPY表达主要见于肺支气管周围和血管周围区的巨噬细胞样细胞。NPY-Y1和-Y5受体在肺结构细胞和炎症细胞中呈现结构性表达。
结论:活化的巨噬细胞样细胞产生的NPY参与了哮喘患者气道内细胞因子产生和免疫细胞活性的调节。然而,NPY增加是否为一种防御性/代偿性机制来调节炎症性细胞因子尚不清楚。
(苏楠 审校)
Exp Mol Pathol. 2012 Jun 12. [Epub ahead of print]
NPY and NPY receptors in airway structural and inflammatory cells in allergic asthma.
Makinde TO, Steininger R, Agrawal DK.
Abstract
PURPOSE: Neuropeptide Y (NPY) level is elevated in allergic asthmatic airways and activation of NPY receptor-1 (NPY-Y1) on antigen-presenting cells (APCs) is essential for T cell priming. Paradoxically, NPY-Y1 modulates hyper-responsiveness in T cells, suggesting a bimodal role for NPY in APCs and T cells. Therefore, determination of the temporal and spatial expression pattern of NPY and its receptors in asthmatic airways is essential to further understand the role of NPY in allergic asthma.
METHODS: Lungs were isolated from control and acute and chronic stages of OVA-sensitized and challenged mice (OVA). Stains, including H&E, PAS, and trichrome, were used to determine the severity of lung pathology. The expression patterns of NPY and NPY-Y receptors in the airways were determined using ELISA and immunofluorescence. Cytokine levels in the BALF were also measured.
RESULTS: NPY levels were undetectable in the BALF of control mice, but significantly increased in the OVA group at day 80. Levels of IL-4, TGF-β1 and TGF-β2, significantly increased and peaked on day 45 and decreased on day 80 in the OVA group, exhibiting an inverse correlation with NPY levels. NPY expression was localized to macrophage-like cells in the peri-bronchial and peri-vascular areas in the lung tissue. NPY-Y1 and -Y5 receptors were constitutively expressed by both structural and inflammatory cells in the lung tissue.
CONCLUSIONS: NPY produced by activated macrophage-like cells may be involved in regulating cytokine production and cellular activities of immune cells in asthma. However, it remains unclear whether such an increase in NPY is a defensive/compensatory mechanism to modulate the effects of inflammatory cytokines.
Exp Mol Pathol. 2012 Jun 12. [Epub ahead of print]
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