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Lysosomal degradation of ubiquitinated β2-adrenergic receptors (β2ARs) serves as a major mechanism of long-term desensitization in response to prolonged agonist stimulation. Surprisingly, the βAR antagonist carvedilol also induced ubiquitination and lysosomal trafficking of both endogenously expressed β2ARs in vascular smooth muscle cells (VSMCs) and overexpressed Flag-β2ARs in HEK-293 cells. Carvedilol prevented β2AR recycling, blocked recruitment of Nedd4 E3 ligase, and promoted the dissociation of the deubiquitinases USP20 and USP33. Using proteomics approaches (liquid chromatography–tandem mass spectrometry), we identified that the E3 ligase MARCH2 interacted with carvedilol-bound β2AR. The association of MARCH2 with internalized β2ARs was stabilized by carvedilol and did not involve β-arrestin. Small interfering RNA–mediated down-regulation of MARCH2 ablated carvedilol-induced ubiquitination, endocytosis, and degradation of endogenous β2ARs in VSMCs. These findings strongly suggest that specific ligands recruit distinct E3 ligase machineries to activated cell surface receptors and direct their intracellular itinerary. In response to β blocker therapy with carvedilol, MARCH2 E3 ligase activity regulates cell surface β2AR expression and, consequently, its signaling.

MARCH2 promotes endocytosis and lysosomal sorting of carvedilol-bound β2-adrenergic receptors