Exosomes are naturally occurring, membranous nanovesicles of 40-100 nm in diameter. They arise from the endocytic cellular pathway through three stages: (i) formation of endocytic vesicles ii) multivesicular bodies (MVBs) formation in the cytosol and (iii) fusion of the MVBs with the plasma membrane to release their nanovesicular cargoes (1, 2).