Biomimetic targeting of nanoparticles to immune cell subsets via cognate antigen interactions

Summary

This proof-of-concept study targets immune cells according to the antigen specificity of their receptors rather than a generic lineage marker. Nanoparticles were coated with natural membrane from cells displaying the cognate antigen recognized by the desired immune population. Using red-blood-cell-specific B cells as a model, erythrocyte-membrane-coated particles bound those B cells more strongly than control nanoparticles. The researchers then applied the principle in mouse models of alloimmunity and autoimmunity, where B cells raised against red blood cells could be positively labeled by the biomimetic particles. The principal finding is that a complete antigen-bearing membrane can function as a multivalent bait for immune receptors and thereby identify a disease-relevant clonal subset. This differs from conventional targeting that recognizes all cells of one class, because it resolves cells by what antigen they bind. Its significance is a possible platform for detecting or treating autoreactive populations and, more speculatively, for preventing malignancies involving defined immune-cell receptors. The abstract demonstrates labeling but does not report selective depletion or therapy, sensitivity and specificity, effects on normal B cells, the range of antigens supported, or translation to human autoimmune disease.