TY  - JOUR
A1  - Goyal, Atul
A1  - Neill, Thomas
A1  - Owens, Rick T.
A1  - Schäfer, Liliana
A1  - Iozzo, Renato V.
T1  - Reprint of: Decorin activates AMPK, an energy sensor kinase, to induce autophagy in endothelial cells
T2  - Matrix biology
N2  - The highly conserved eukaryotic process of macroautophagy (autophagy) is a non-specific bulk-degradation program critical for maintaining proper cellular homeostasis, and for clearing aged and damaged organelles. This decision is inextricably dependent upon prevailing metabolic demands and energy requirements of the cell. Soluble monomeric decorin functions as a natural tumor repressor that antagonizes a variety of receptor tyrosine kinases. Recently, we discovered that decorin induces endothelial cell autophagy, downstream of VEGFR2. This process was wholly dependent upon Peg3, a decorin-inducible genomically imprinted tumor suppressor gene. However, the signaling cascades responsible have remained elusive. In this report we discovered that Vps34, a class III phosphoinositide kinase, is an upstream kinase required for Peg3 induction. Moreover, decorin triggered differential formation of Vps34/Beclin 1 complexes with concomitant dissolution of inhibitive Bcl-2/Beclin 1 complexes. Further, decorin inhibited anti-autophagic signaling via suppression of Akt/mTOR/p70S6K activity with the concurrent activation of pro-autophagic AMPK-mediated signaling cascades. Mechanistically, AMPK is downstream of VEGFR2 and inhibition of AMPK signaling abrogated decorin-evoked autophagy. Collectively, these findings hint at the complexity of the underlying molecular relays necessary for decorin-evoked endothelial cell autophagy and reveal important therapeutic targets for augmenting autophagy and combatting tumor angiogenesis.
KW  - Decorin
KW  - IR-A
KW  - Signaling
KW  - Proliferation
Y1  - 2014
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/53683
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30:3-536832
SN  - 1569-1802
SN  - 0945-053X
N1  - Under a Creative Commons license
N1  - Zuerst erschienen in: Matrix biology, 34.2014, S. 46-54, doi:10.1016/j.matbio.2013.12.011
VL  - 35
SP  - 42
EP  - 50
PB  - Elsevier
CY  - Amsterdam [u. a.]
ER  -