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Significance We identified a function for a member of the extracellular matrix in the regulation of autophagy. Decorin, a member of the small leucine-rich proteoglycan family and an established pan-receptor tyrosine kinase inhibitor, evokes endothelial cell autophagy and inhibits angiogenesis. This process is mediated by a high-affinity interaction with VEGFR2 which leads to increased levels of Peg3, a tumor-suppressor gene. We provide mechanistic evidence that Peg3 is required to maintain basal levels of Beclin 1, a major autophagic marker. These data provide a paradigmatic shift for other soluble matrix constituents to regulate autophagy.

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