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Hsu, Chieh; Morohashi, Yuichi; Yoshimura, Shin-ichiro; Manrique-Hoyos, Natalia; Jung, SangYong; Lauterbach, Marcel A; Bakhti, Mostafa; Grønborg, Mads; Möbius, Wiebke; Rhee, JeongSeop; Barr, Francis A; Simons, Mikael
The Journal of cell biology, 04/2010, Letnik: 189, Številka: 2Journal Article
Oligodendrocytes secrete vesicles into the extracellular space, where they might play a role in neuron-glia communication. These exosomes are small vesicles with a diameter of 50-100 nm that are formed within multivesicular bodies and are released after fusion with the plasma membrane. The intracellular pathways that generate exosomes are poorly defined. Because Rab family guanosine triphosphatases (GTPases) together with their regulators are important membrane trafficking organizers, we investigated which Rab GTPase-activating proteins interfere with exosome release. We find that TBC1D10A-C regulate exosome secretion in a catalytic activity-dependent manner. We show that Rab35 is the target of TBC1D10A-C and that the inhibition of Rab35 function leads to intracellular accumulation of endosomal vesicles and impairs exosome secretion. Rab35 localizes to the surface of oligodendroglia in a GTP-dependent manner, where it increases the density of vesicles, suggesting a function in docking or tethering. These findings provide a basis for understanding the biogenesis and function of exosomes in the central nervous system.
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in: SICRIS
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