Antibody Epitope Destroyed by Enzymatic Digestion (Flow Cytometry (Sample Considerations))

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Accepted Answer

Loss of antibody binding after tissue dissociation or adherent cell detachment. Anti-cadherin and other surface markers show negative or weak staining despite expected expression. Common causes: 1) Trypsin/EDTA treatment cleaves and inactivates cadherin epitopes on adherent cells 2) Harsh enzymatic tissue digestion protocols destroy surface protein epitopes 3) Protease cleavage sites overlap with antibody recognition sequences 4) Extended enzyme exposure time increases epitope damage Solutions: 1) Replace Trypsin/EDTA with gentler detachment solutions like Accutase for adherent cells 2) Optimize tissue/cell preparation protocol to minimize enzyme concentration and incubation time 3) Pilot test different antibody clones targeting alternative epitopes on the same protein 4) Use mechanical dissociation methods (e.g., gentle pipetting, cell scraper) when feasible 5) Validate enzyme compatibility with critical markers using positive control cell lines 6) Consider non-enzymatic dissociation buffers (e.g., EDTA-based, enzyme-free) for epitope-sensitive targets