Dendritic Cell Plasticity, Radiation, and Newton's Third Law

Summary Regulatory T cells protect damaged tissues but can undermine the effects of cancer treatments, including radiotherapy (RTx). Intratumoral immunostimulatory dendritic cells (type 1 conventional dendritic cells) respond to RTx with the production of regulatory T cell–attracting MDC/CCL22, undermining RTx effects. That effect can be reversed by EGFR-targeted IFNα, highlighting cDC1 plasticity and relevance as therapeutic targets. See related article by Bugno et al., p. XX