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Normal murine respiratory tract has its mucus concentrated in clouds based on the Muc5b mucin.

Am J Physiol Lung Cell Mol Physiol. 2020 Jun 01;318(6):L1270-L1279. doi:10.1152/ajplung.00485.2019. Epub 2020 Apr 29
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摘要


The organization of the normal airway mucus system differs in small experimental animals from that in humans and large mammals. To address normal murine airway mucociliary clearance, Alcian blue-stained mucus transport was measured ex vivo on tracheal tissues of naïve C57BL/6, Muc5b-/-, Muc5ac-/-, and EGFP-tagged Muc5b reporter mice. Close to the larynx with a few submucosal glands, the mucus appeared as thick bundles. More distally in the trachea and in large bronchi, Alcian blue-stained mucus was organized in cloud-like formations based on the Muc5b mucin. On tilted tissue, the mucus clouds moved upward toward the larynx with an average velocity of 12 µm/s compared with 20 µm/s for beads not associated with clouds. In Muc5ac-/- mice, Muc5b formed mucus strands attached to the tissue surface, while in Muc5b-/- mice, Muc5ac had a more variable appearance. The normal mouse lung mucus thus appears as discontinuous clouds, clearly different from the stagnant mucus layer in diseased lungs.

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