Abstract
The existence of endothelium-derived vascular relaxant factor (EDRF) was postulated by Furchgott and colleagues1 when they observed that acetylcholine paradoxically relaxed preconstricted aortic strip preparations by an endothelium-dependent mechanism. This phenomenon has since been demonstrated in different blood vessels and mammalian species and it can be elicited by several other agents1–6. EDRF has been thought to be a humoral agent, a lipoxygenase derivative and possibly a free radical1. In the study reported here, by using aortic preparations from the rabbit, alone and in cascade experiments with isolated perfused coronary preparations, we demonstate definitively that EDRF is a humoral agent. It is released from unstimulated aortic preparations containing endothelium, its relaase can be stimulated for prolonged periods by acetylcholine, and it is not a lipoxygenase derivative or free radical but an unstable compound with a carbonyl group at or near its active site.
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Griffith, T., Edwards, D., Lewis, M. et al. The nature of endothelium-derived vascular relaxant factor. Nature 308, 645–647 (1984). https://doi.org/10.1038/308645a0
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DOI: https://doi.org/10.1038/308645a0
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