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The development and function of lung-resident macrophages and dendritic cells

机译:肺部巨噬细胞和树突状细胞的发育和功能

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Gas exchange is the vital function of the lungs. It occurs in the alveoli, where oxygen and carbon dioxide diffuse across the alveolar epithelium and the capillary endothelium surrounding the alveoli, separated only by a fused basement membrane 0.2-0.5 mu m in thickness. This tenuous barrier is exposed to dangerous or innocuous particles, toxins, allergens and infectious agents inhaled with the air or carried in the blood. The lung immune system has evolved to ward off pathogens and restrain inflammation-mediated damage to maintain gas exchange. Lung-resident macrophages and dendritic cells are located in close proximity to the epithelial surface of the respiratory system and the capillaries to sample and examine the air-borne and blood-borne material. In communication with alveolar epithelial cells, they set the threshold and the quality of the immune response.
机译:气体交换是肺部的重要功能。它发生在肺泡中,其中氧气和二氧化碳扩散穿过肺泡上皮和围绕肺泡的毛细血管内皮,仅被厚度为0.2-0.5μm的融合基底膜隔开。这种微弱的屏障暴露在危险的或无害的颗粒,毒素,过敏原和传染性物质中,这些微粒被空气吸入或携带在血液中。肺部免疫系统已进化为抵御病原体并抑制炎症介导的损害,以维持气体交换。驻留肺的巨噬细胞和树突状细胞紧邻呼吸系统和毛细血管的上皮表面,以取样和检查空气传播和血液传播的物质。通过与肺泡上皮细胞的沟通,他们设定了免疫反应的阈值和质量。

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