MUC5B (E4Y5Z) Rabbit mAb #74978

Mucins are a family of macromolecules that line and protect the respiratory epithelium from microbes and pollutants in the local environment. Of the family members that are known to date, some are produced in a cell type and tissue-specific manner, suggesting distinct biological roles for members. Some members polymerize after secretion to form gel-like substances that coat the epithelial layer. MUC5AC and MUC5B are family members that polymerize in this manner. Others do not polymerize, and others yet, have a transmembrane domain and remain physically attached to the epithelia (1). While it is known that mucins are protective to the respiratory epithelium, it has been reported that changes in expression of mucins are associated with several forms of lung disease, such as cystic fibrosis, COPD, asthma, pulmonary fibrosis, and others (1-4). Multiple studies have shown that one of the largest known risks of developing lung fibrosis is linked to a genetic variant of MUC5B (5,6).