part of part of paneth cell paneth cell of colon https://cellxgene.cziscience.com/cellguide/CL_0009009 A paneth cell that is located in the epithelium of the colon. paneth cell of epithelium of colon Paneth cells of the colon are specialized secretory epithelial cells that can be found in the large intestine, albeit in small numbers compared with the small intestine where Paneth cells are more abundant. Under disease conditions such as inflammatory bowel disease, Paneth cells increase in numbers in the colon. They reside in the crypts of Lieberkühn, which are glandular structures embedded within the mucosal layer of the small and large intestine. Paneth cells play a crucial role in maintaining intestinal homeostasis and acting as a frontline of defense in our bodies against ingested microbes. They achieve this through the secretion of antimicrobial peptides and proteins such as lysozyme and defensins, which can directly kill or inhibit the growth of various bacteria, fungi, and viruses. They degranulate these substances into the intestinal lumen, especially under conditions of pathogenic invasion or damage to the epithelial lining. Moreover, Paneth cells are essential for the maintenance of intestinal stem cells, which continually replace the epithelium of the intestine. They create a niche for these stem cells at the base of the crypts, secreting various signaling molecules and factors that are essential for the growth and differentiation of intestinal stem cells. In essence, the existence and function of Paneth cells are fundamental to the overall gut health and immune defense system, by providing both antimicrobial functions and a conducive environment for the renewal of the intestinal lining. The role of Paneth cells specifically in the colon is of interest in the context of inflammatory bowel disease, such as ulcerative colitis and Crohn’s disease: Their presence in the colon is thought to represent Paneth cell metaplasia and indicates a chronic inflammatory state. (This extended description was generated by ChatGPT and reviewed by the CellGuide team, who added references, and by the CL editors, who approved it for inclusion in CL. It may contain information that applies only to some subtypes and species, and so should not be considered definitional.) paneth cell of epithelium of large intestine paneth-like cell colon glandular cell Homo sapiens colonic epithelium