MUC5AC (Mucin 5AC, Gastric Mucin)

MUC5AC (gastric mucin) belongs to the gel-forming mucin family of glycoproteins, the major components of the protective mucus layer on the mucosal surfaces of epithelial tissues. Mucus protects the tissue surface from mechanical damage, stabilizes the luminal microenvironment, and traps pathogens including bacteria and viruses for mucociliarly clearance. MUC5AC, like other family members, is differentially expressed. MUC5AC is expressed in airway and gastric epithelial cells and highly expressed in colorectal carcinomas. Although not normally detected by antibody in adult colon, MUC5AC is detectable in fetal colon. It is thought that positive MUC5AC antibody staining in colorectal cancer may be due to the resurgence of MUC5AC expression or the unmasking of an embryonic MUC5AC antibody reactive epitope during tumorigenesis. There are qualitative and quantitative alterations of MUC5AC expression in association with various pathological conditions. For example, S dysentariae infection induced MUC5AC expression in HT29 cells which was inhibited by polymyxin B pretreatment (Raja et al, 2011). Antibody studies identified elevated MUC5AC levels in benign and malignant gallbladder lesions (Xiong et al, 2011). On the other hand, MUC5AC expression is decreased or has abnormal glycosylation in the goblet cells of conjunctiva in a number of eye inflammatory conditions including Sjogren, Steven-Johnson and dry eye syndromes (Contreras-Ruiz, 2012). The MUC5AC antibody is widely used. For example, it has been used as part of an antibody panel to help distinguish esophageal adenocarcinoma (MUC5AC/+) from squamous cell carcinoma (MUC5AC/-) (DiMaio et al, 2012). \n\nApplications: \nSuitable for use in Flow Cytometry, Western Blot, Immunohistochemistry. Other applications not tested.\n\nRecommended Dilution:\nFlow Cytometry: 1ug/10e6 cells\nImmunohistochemistry(Paraffin): 1:500\nOptimal dilutions to be determined by the researcher.\n\nStorage and Stability:\nMay be stored at 4 degrees C for short-term only. Aliquot to avoid repeated freezing and thawing. Store at -20 degrees C. Aliquots are stable for 12 months. For maximum recovery of product, centrifuge the original vial after thawing and prior to removing the cap.

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