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. 2021 Apr 23;19:47. doi: 10.1186/s12964-021-00730-1

Table 2.

Exosome composition and roles of main components

Exosome composition
Category Examples Role References
Proteins
Tetraspanins CD9, CD63, CD37, CD81, CD82, CD53 Exosome biogenesis, exosome cargo selection, targeting and uptake [107, 187]
ESCRT machinery/MVB biogenesis Alix, TSG-101 Exosome biogenesis [49, 107]
Heat Shock Proteins (Hsp) Hsp90, Hsc70, Hsp60, Hsp20, Hsp27 Exosomes release, signalling [188190]
Membrane transport and fusion GTPases, Annexins, Flotillin, Rab GTPases, dynamin, syntaxin Exosome secretion and uptake [16, 66, 73, 140]
Major Histocompatibility Complex (MHC) molecules MHC Class I, MHC Class II Antigen presentation to generate immunological response [191, 192]
Cytoskeletal proteins Actin, Cofilin, Tubulin Exosome biogenesis and secretion [16, 19, 30]
Adhesion Integrin-α,-β, P-selectin Exosome targeting and uptake [16, 19]
Glycoproteins β-galactosidase, O-linked glycans, N-linked glycans Exosomes targeting and uptake [193, 194]
Growth factors and cytokine TNF-α, TGF-β, TNF-related apoptosis inducing ligand (TRAIL) Exosome targeting and uptake, signalling [116, 162]
Other signalling receptors Fas ligand (FasL), TNF receptor, Transferrin receptor (TfR) Exosome targeting and signalling including apoptosis induction and iron transport [16, 36, 116]
Category Role References
Lipids
Cholesterol Exosome secretion [195, 196]
Ceramides Cargo sorting and exosome secretion [54, 197]
Sphingomyelin Exosome rigidity and signalling [111, 197]
Phosphatidylserine Exosome formation, signalling and uptake [32, 196, 198]
Phosphatidylcholine Exosome formation and structure
Phosphatidylethanolamine Exosome formation and structure
Phosphatidylinositol Exosome formation and structure
Gangliosides Exosome rigidity