Journal
SEMINARS IN CELL & DEVELOPMENTAL BIOLOGY
Volume 13, Issue 4, Pages 303-311Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/S1084952102000605
Keywords
antigen presentation; exosomes; MHC II; multivesicular bodies; sorting
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Multivesicular bodies (MVBs) are ubiquitous endocytic organelles containing numerous 50-80nm vesicles. MVBs are very dynamic in shape and function. In antigen presenting cells (APCs), MVBs play a central role in the loading of major histocompatibility complex class II (MHC H) with antigenic peptides. How MHC II is transported from MVBs to the cell surface is only partly understood. One way involves direct fusion of MVBs with the plasma membrane. As a consequence, their internal vesicles are secreted as so-called exosomes. An alternative has been illustrated in maturing dendritic cells (DCs). Here, MVBs are reshaped into long tubules by back fusion of the internal vesicles with the MVB limiting membrane. Vesicles derived from the tips of these tubules then carry MHC II to the cell surface.
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