Science Study Finds Heart Collaterals Grow From Capillaries, Not Existing Arteries
Updated
Updated · BIOENGINEER.ORG · Aug 22
Science Study Finds Heart Collaterals Grow From Capillaries, Not Existing Arteries
2 articles · Updated · BIOENGINEER.ORG · Aug 22
Summary
Genetically engineered mice showed many new coronary collateral arteries arise from capillary endothelial cells after a blockage, overturning the long-held view that backup vessels mainly enlarge from pre-existing arterial links.
Dual lineage-tracing experiments tracked arterial and capillary cell descendants before and after coronary obstruction, showing capillary-derived cells switched on arterial programs and were built into larger conduit-like vessels.
VEGF-linked signaling helped drive that capillary-to-artery transition, suggesting repair depends not just on making more microvessels but on forming durable arteries that connect into the coronary network.
The findings point to a possible way to stimulate the heart's own bypass growth after ischemic injury, but the work remains experimental in mice and VEGF-based therapies still risk abnormal vessel growth and edema.