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Pyruvate kinase type M2 promotes tumour cell exosome release via phosphorylating synaptosome-associated protein 23.

Abstract：

:Tumour cells secrete exosomes that are involved in the remodelling of the tumour-stromal environment and promoting malignancy. The mechanisms governing tumour exosome release, however, remain incompletely understood. Here we show that tumour cell exosomes secretion is controlled by pyruvate kinase type M2 (PKM2), which is upregulated and phosphorylated in tumours. During exosome secretion, phosphorylated PKM2 serves as a protein kinase to phosphorylate synaptosome-associated protein 23 (SNAP-23), which in turn enables the formation of the SNARE complex to allow exosomes release. Direct phosphorylation assay and mass spectrometry confirm that PKM2 phosphorylates SNAP-23 at Ser95. Ectopic expression of non-phosphorylated SNAP-23 mutant (Ser95→Ala95) significantly reduces PKM2-mediated exosomes release whereas expression of selective phosphomimetic SNAP-23 mutants (Ser95→Glu95 but not Ser20→Glu20) rescues the impaired exosomes release induced by PKM2 knockdown. Our findings reveal a non-metabolic function of PKM2, an enzyme associated with tumour cell reliance on aerobic glycolysis, in promoting tumour cell exosome release.

journal_name

Nat Commun

journal_title

Nature communications

authors

Wei Y,Wang D,Jin F,Bian Z,Li L,Liang H,Li M,Shi L,Pan C,Zhu D,Chen X,Hu G,Liu Y,Zhang CY,Zen K

doi

10.1038/ncomms14041

subject

Has Abstract

pub_date

2017-01-09 00:00:00

pages

14041

issn

2041-1723

pii

ncomms14041

journal_volume

8

pub_type

杂志文章

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