Normal murine respiratory tract has its mucus concentrated in clouds based on the Muc5b mucin
Year: 2020
Type: article
Abstract: 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.
Language: English
Subfield: Pulmonary and Respiratory Medicine
Field: Medicine
Domain: Health Sciences
Open Access status: bronze
Funders: Cystic Fibrosis Foundation, Swedish Cancer Foundation, Stiftelserna Wilhelm och Martina Lundgrens, Hjärt-Lungfonden, IngaBritt och Arne Lundbergs Forskningsstiftelse, Knut och Alice Wallenbergs Stiftelse, Vetenskapsrådet, European Research Council, Sahlgrenska Akademin, National Heart, Lung, and Blood Institute, National Institute of Allergy and Infectious Diseases
Awards: G1087262904, Lung Macrophage Programming in Acute Lung Injury, Biochemistry and function of mucins and related molecules in the respiratory and gastrointestinal tracts, The MUC2 Mucus Gel as an Innate Immune Mechanism that Inhibits Inflammation, G5361026234, Role of mucin in lung homeostasis and pathophysiology, Mechanisms of lung macrophage programming by MUC5B during health and disease
OpenAlex ID: W3019560465