Abstract
OUR understanding of the regulation of vascular tone has been extended since the identification of vasoactive agents such as the atrial natriuretic peptides1, endothelial-derived relaxing factor2 and endothelin3. Unidentified vasopressive agents have been found in platelets4. Here we isolate these vasopressors and identify them as diadenosine pentaphosphate (AP5A) and diadenosine hex-aphosphate (AP6A) by chromatography, mass spectrometry, ultraviolet spectroscopy and enzymatic cleavage. In the vasculature of isolated perfused rat kidney, both diadenosine phosphates were active at a concentration of 10−9 M; in aortic rings, contractions were elicited at 10−8 M.Intra-aortic injection in the rat caused a prolonged increase in blood pressure. We conclude that AP5A and AP6A may play a part in local vasoregulation and possibly in the regulation of blood pressure.
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Schlüter, H., Offers, E., Brüggemann, G. et al. Diadenosine phosphates and the physiological control of blood pressure. Nature 367, 186–188 (1994). https://doi.org/10.1038/367186a0
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DOI: https://doi.org/10.1038/367186a0
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