part of part of epithelial cell duct epithelial cell Duct epithelial cells are distinctly specialized cells that predominantly form the lining of glandular ducts. These cells play a crucial role in the secretion, absorption, and transport of fluids depending on the organ they inhabit. They are typically organized in a tubular structure, forming collectively the conduit for the transport of substances. These cells exhibit tight junctions, enabling the careful regulation of the passage of substances and ensuring that no unwanted particles seep through. They are predominantly characterized by their polarized nature, having distinct apical and basolateral surfaces that support its functions of secretion and absorption. The apical surface, exposed to the duct lumen, is specialized for secretion and interaction with the luminal environment, while the basolateral surface is oriented towards the underlying tissue, facilitating interactions with neighboring cells and the extracellular matrix. The ducts serve as the bridge between the gland and the site of secretion, allowing the substances produced by the gland to exit into the body. Thus, duct epithelial cells have a sweeping role in various physiological functions, ranging from defense against pathogens in the respiratory and digestive tracts, to secretion of digestive enzymes, to milk production in mammary glands. As a result of their specialized function, any impairment in the function of duct epithelial cells to function properly often leads to certain diseases or disorders. Studies have identified potential correlation between malfunctioning duct epithelial cells and conditions such as cystic fibrosis, chronic obstructive pulmonary disease, and certain cancers, particularly breast and pancreatic. (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.) ZFA:0009372 An epithelial cell that is part of a duct. https://cellxgene.cziscience.com/cellguide/CL_0000068 duct