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The mucus that coats the gastrointestinal tract of all mammals is a dynamic and sticky gel layer and represents the first protective barrier between the host and the hostile environment. There is, however, a lack of detailed knowledge about the mucus gel organization because of the high water content and the complexity of MUC2, the main gel-forming molecule in the intestine. Histological staining and a multilabel immunofluorescence method were used to examine mucus blankets and Muc2 in mouse colon and ileum samples fixed in Carnoy's solution, unveiling an extraordinarily complex but highly structured mucus gel organization. The inner firmly adherent mucus blanket consists of alternating layers. The thicker outer loosely adherent mucus blanket in the colon is made of alternating laminated layers and loose curl-like structures. The layers consist of Muc2 molecules with different fucosylation states and glycoforms remain unmixed in the mucus. Importantly, distinct goblet cell subpopulations throughout the ileum along the crypt-to-villus axis with an alternation of goblet cells secreting fucosylated and non-fucosylated Muc2 are observed. A better understanding of the mucus structure should contribute to improve the efficiency of DNA and drug delivery and will allow for a better understanding and treatment of inflammatory and infectious intestinal diseases.

The Extraordinarily Complex but Highly Structured Organization of Intestinal Mucus-Gel Unveiled in Multicolor Images