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. 2012 Jun 3;14(7):677-85.
doi: 10.1038/ncb2502.

Syndecan-syntenin-ALIX regulates the biogenesis of exosomes

Maria Francesca Baietti  1 , Zhe Zhang, Eva Mortier, Aurélie Melchior, Gisèle Degeest, Annelies Geeraerts, Ylva Ivarsson, Fabienne Depoortere, Christien Coomans, Elke Vermeiren, Pascale Zimmermann, Guido David
Affiliations

Syndecan-syntenin-ALIX regulates the biogenesis of exosomes

Maria Francesca Baietti et al. Nat Cell Biol. .

Abstract

The biogenesis of exosomes, small secreted vesicles involved in signalling processes, remains incompletely understood. Here, we report evidence that the syndecan heparan sulphate proteoglycans and their cytoplasmic adaptor syntenin control the formation of exosomes. Syntenin interacts directly with ALIX through LYPX(n)L motifs, similarly to retroviral proteins, and supports the intraluminal budding of endosomal membranes. Syntenin exosomes depend on the availability of heparan sulphate, syndecans, ALIX and ESCRTs, and impact on the trafficking and confinement of FGF signals. This study identifies a key role for syndecan-syntenin-ALIX in membrane transport and signalling processes.

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