Mucin 2 protein (MUC2)

Mucin production in the intestinal epithelium refers primarily to the synthesis and secretion of highly glycosylated proteins called **mucins**, with **Mucin 2 protein (MUC2)** being the predominant form in the intestine. These proteins are secreted by goblet cells within the epithelial lining. The secreted mucins form a structured mucus layer that serves as a critical barrier between luminal contents—including bacteria—and the underlying epithelial cells. This barrier provides lubrication for food passage, protects against commensal microorganisms and pathogens, participates in cell signaling pathways, and shields from environmental irritants. There are two main types of intestinal mucins: - **Secreted gel-forming mucins** (e.g., MUC2), which create the structural backbone for the mucus layer. - **Transmembrane mucins**, which contribute to forming a glycocalyx on epithelial surfaces. The regulation of mucin production involves both basal secretion under normal conditions and regulated/compound exocytosis triggered by microbial products, cytokines, hormones, or neurotransmitters such as acetylcholine. Goblet cell differentiation is controlled by transcription factors like SPDEF as well as Notch/Wnt signaling pathways[1][2]. Deficiency or dysfunction in MUC2 results in loss of this protective barrier—leading to direct bacterial contact with epithelial cells—which can trigger inflammation (as seen in IBD) or increase susceptibility to colorectal cancer[3]. Changes in quantity or quality of secreted mucins are associated with several gastrointestinal diseases. **Note:** "Mucin production" is not itself a molecular target but rather a biological process involving multiple genes/proteins—primarily MUC2—in goblet cells. For structured data purposes focused on drug targets/receptors/enzymes/etc., "Mucin 2 protein" would be considered canonical; "mucin production" is too broad/not specific enough for most target databases.[1][3]

Other names

Intestinal mucinSecreted gel-forming mucinColonic mucin