Blood flow guides vessel growth and prunes unused sprouts in zebrafish

Live imaging shows how moving blood coordinates endothelial cells and helps shape developing vascular networks.

Editorial illustration — not from the study.

Researchers used live imaging to study the sub-intestinal venous plexus, a developing network of blood vessels in zebrafish. They found that blood flow coordinated the collective movement of endothelial cells, the cells that line blood vessels, during network remodelling.

Blood flow opposed the cells’ continued movement toward the belly and was needed for non-perfused leading sprouts to regress as the plexus grew. Cells from these sprouts moved against the flow and joined the sub-intestinal vein. When flow was low, sprout regression could still occur but depended on the Vegfr3/Flt4 signalling pathway.

How blood flow reshaped vessels

Blood flow coordinated collective endothelial-cell migration within the developing zebrafish sub-intestinal venous plexus. It opposed continuous movement toward the belly and was required for angiogenic sprout regression, a process that helps refine the growing vascular network. Cells from non-perfused leading sprouts migrated against the blood flow and became incorporated into the sub-intestinal vein. Regression remained possible under low-flow conditions, but required Vegfr3/Flt4 function.

Why vessel pruning matters

The findings show how blood flow can influence both the movement of vessel-lining cells and the decision to retain or remove developing sprouts. They identify Vegfr3/Flt4 as part of the mechanism that supports sprout regression when blood flow is low, adding detail to how developing blood-vessel networks are shaped into more efficient connections.

Evidence and caveats

The study used live imaging and functional experiments in the developing sub-intestinal venous plexus of zebrafish. This provides direct evidence of cell movements and blood-flow-dependent remodelling in that model. The abstract does not establish whether the same processes occur in humans or other tissues, nor does it test a disease or treatment. It also does not provide quantitative measurements of the effects.

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