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Significance Dendritic cells (DCs) ingest bacteria at sites of infection, signal the presence of invaders via phagosomal Toll-like receptors (TLRs), and present bacterial antigens to the adaptive immune system. We show that TLR signaling from maturing phagosomes in DCs stimulates the formation of membrane tubules that facilitate content transfer with other signaling phagosomes and thereby promote optimal presentation of phagocytosed antigens. The phagosomal tubules are thus functionally distinct from those of lysosomes and link innate immune signaling to enhanced adaptive immune responses.

TLR-dependent phagosome tubulation in dendritic cells promotes phagosome cross-talk to optimize MHC-II antigen presentation