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Mucus and mucins in diseases of the intestinal and respiratory tracts

Gunnar C Hansson
Journal of Internal Medicine 2019 April 8
This review describes the organization and importance of mucus in the intestine and lungs in relation to the diseases cystic fibrosis, ulcerative colitis and COPD. The inner surfaces of the body are protected by mucus built around polymeric glycoproteins called mucins. In the disease Cystic Fibrosis (CF), the small intestinal mucus is in contrast the normal attached to the epithelium, explaining the intestinal problems at this disease. The inner of the two mucus layers of colon is normally impenetrable to bacteria, keeping the commensals away from and protecting the epithelium. This impenetrable property is dependent on the bacterial composition and the host diet, observations that can explain the increased incidence of inflammatory bowel diseases in the western world as bacteria reach the epithelial cells in active ulcerative colitis. The respiratory tract is normally cleared by thick mucus bundles that moved by the cilia sweep the epithelial surface. In CF, the bundles are non-moving already at birth. Cholinergic stimulations stop the bundle movement explaining some of the beneficial effect of anticholinergic treatment in COPD. In this disease as well as in more developed CF, an attached mucus layer is formed. This mucus has features similar to the protective inner colon mucus and is by this able to separate bacteria from the epithelial surface. When formed in healthy individuals this mucus can be coughed up, but in chronically diseased lungs, bacteria colonizing the mucus will remain in the lungs and the resulting inflammation contribute to the destruction of the lungs. This article is protected by copyright. All rights reserved.


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