Langerhans Cells Orchestrate TFH-Dependent Humoral Immunity.

T follicular helper cells contribute to the development of long-lasting humoral immunity by germinal center formation. Somatic hypermutation and affinity maturation take place in germinal centers leading to the generation of memory B cells and plasma cells. As such, T follicular helper cells impact immunodeficiencies, autoimmunity, and cancer. This necessitates further understanding of how T follicular helper cells are regulated in health and disease. The current study by Levin et al. builds on prior work to further substantiate a critical role for skin migratory dendritic cells and in particular Langerhans cells at governing T follicular helper and germinal center formation after intradermal immunization with HIV p24-coated polylactic acid nanoparticles.