Brain Homogenate Decoys for Antigen-Specific Cell Amplification.

Multiple sclerosis is complex and heterogeneous. Better tools are needed to be able to monitor this disease among individuals, but blood-based biomarkers are often too rare to profile. In this work, we developed antigen-specific biomaterials to replicate the central nervous system niche where multiple sclerosis biomarkers are amplified. We incorporated mouse brain homogenate into a microporous gelatin methacrylate network. Homogenate-containing biomaterials differentially stimulated cells and led to the marked amplification of disease-relevant, antigen-specific B cells. These results demonstrate that biomaterials containing primary tissue homogenate retain antigen specificity and may be a useful tool for decoding human autoimmunity.