Platelet Rubicon drives thrombosis independent of autophagy

In this issue of Blood Advances, Alfar et al 1 have identified an unexpected, autophagy-independent function for the protein Rubicon (RUN domain Beclin-1-interacting and cysteine-rich-containing protein) in platelets, demonstrating that it is a key promoter of arterial thrombosis.Rubicon is widely recognized in nucleated cells as a negative regulator that actively inhibits autophagy, a critical housekeeping process during which cellular components are recycled. 2,3The new findings, based on mice with a platelet-specific deletion of Rubicon (Rubcn -/-), reveal that its role in platelets is different, promoting thrombosis without significantly altering the activation-induced recycling mechanisms.This work fundamentally changes our understanding of how Rubicon controls platelet biology and offers a new pathway to explore in the treatment of cardiovascular disease.