Scribble and Myosin-1c Stabilize Junctions During Angiogenic Sprouting

Key Takeaways

• Scribble binds VE-cadherin to reinforce endothelial junctions
• Myosin-1c generates contractile force stabilizing angiogenic sprouts
• Scribble knockout disrupts junction integrity, impairing sprout formation
• Findings suggest new targets for anti‑angiogenic therapies

Pulse Analysis

Angiogenesis relies on a delicate balance between cell adhesion and contractility, yet the molecular bridges that coordinate these forces have remained elusive. The new study leverages proximity‑labeling (BioID) of VE‑cadherin to map its interactome, uncovering Scribble—a scaffolding protein traditionally linked to cell polarity—as a direct partner. By anchoring myosin‑1c, a single‑headed actin motor, Scribble translates polarity cues into mechanical tension at adherens junctions, ensuring that nascent sprouts maintain cohesion as they elongate.

The functional experiments reinforce this model: endothelial cells lacking Scribble exhibit fragmented VE‑cadherin plaques, reduced myosin‑1c recruitment, and compromised sprout stability in three‑dimensional matrices. Conversely, re‑expressing Scribble restores junctional tension and normal sprouting dynamics. These findings integrate two previously separate research streams—polarity signaling and cytoskeletal contractility—into a unified framework that explains how endothelial cells fine‑tune their adhesive contacts during vessel formation.

Beyond basic biology, the work carries translational weight. Aberrant angiogenesis underpins tumor growth, ocular neovascular diseases, and chronic inflammation. Targeting the Scribble‑myosin‑1c axis could modulate junctional stability without broadly inhibiting VEGF, potentially reducing side effects associated with current anti‑angiogenic drugs. As the field moves toward precision vascular therapeutics, this mechanistic insight offers a promising new lever for controlling pathological vessel growth.