Role of endosomal system is central to both innate and adaptive immune responses.
Endosomes contribute to antigen presentation of MHCI, MHCII and CD1 molecules.
Endosomes regulate antigen receptor signalling in both B cells and T cells.
A number of immune receptors signal from intracellular endosomal compartments.
The diverse roles of endosomes in a range of immune responses are discussed.