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Arteriogenesis and Collateral Targeting Research Group, Department of Cardiology, University Hospital Hamburg-Eppendorf, D-20246 Hamburg, Germany
Previous findings have suggested that collateral arteries grow from preexisting arteriolar anastomoses ("arteriogenesis"). To investigate whether collateral growth occurs without preceding angiogenesis, we obtained vascular casts and postmortem angiographies 3, 7, and 21 days after unilateral femoral artery occlusion in the rat. Proliferation kinetics were determined after 5'-bromo-2'-desoxyuridin infusion. A preexisting anastomosis was identified. Proliferation of this vessel began 24 h after femoral artery occlusion, increased maximally during the first 3 days, and reached 60% at day 7. Cell division was restricted to preexisting anastomoses and occurred neither in directly neighboring arterial vessels nor in capillaries. Collateral vessels doubled their diameter within 7 days and assumed a typical corkscrew appearance (increase of length: 21%). After 7 days of occlusion, we measured a further increase of length (14%) but no proliferation or increase of diameter. We conclude that arteriogenesis is a biphasic process involving rapid proliferation of preexisting arteriolar shunts followed by pronounced remodeling processes. Arteriogenesis occurs independently of angiogenesis and denotes a separate entity of vascular proliferation.
angiogenesis; arteriogenesis; collateral growth; vascular remodeling
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