A periciliary brush promotes the lung health by separating the mucus layer from airway epithelia.

A periciliary brush promotes the lung health by separating the mucus layer from airway epithelia.
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DOI:
10.1126/science.1223012
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发表时间:
2012-08-24
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Rubinstein M
Rubinstein M
中科院分区:
其他
文献类型:
--
作者:
Button B;Cai LH;Ehre C;Kesimer M;Hill DB;Sheehan JK;Boucher RC;Rubinstein M

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粘液清除是保护气道免受吸入的传染性和有毒物质的主要防御机制。在目前的凝胶-液体粘液清除模型中,粘液凝胶被推进到纤毛周围的“水状”纤毛周层的顶部。然而,这个模型无法解释健康状态下不同粘液层的形成,也无法解释疾病中粘液清除失败的原因。我们提出了一个凝胶刷模型,其中纤毛周围层被跨膜粘蛋白和粘多糖密集地拴系到气道表面。这种刷子可以防止粘液渗透到睫状体周围空间,并使粘液形成一个独特的层。粘液和纤毛周刷层的相对渗透模量解释了健康状态下粘液清除的稳定性及其在气道疾病中的失败。
Mucus clearance is the primary defense mechanism that protects airways from inhaled infectious and toxic agents. In the current Gel-on-Liquid mucus clearance model mucus gel is propelled on top of a “watery” periciliary layer surrounding the cilia. However, this model fails to explain the formation of distinct mucus layer in health or why mucus clearance fails in disease. We propose a Gel-on-Brush model in which the periciliary layer is occupied by membrane spanning mucins and mucopolysaccharides densely tethered to the airway surface. This brush prevents mucus penetration into the periciliary space and causes mucus to form a distinct layer. The relative osmotic moduli of the mucus and periciliary brush layers explain both the stability of mucus clearance in health and its failure in airway disease.
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