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Haptoglobin-haemoglobin complex in human plasma inhibits endothelium dependent relaxation: evidence that endothelium derived relaxing factor acts as a local autocoid

Edwards, David Hughes, Griffith, T. M., Ryley, H. C. and Henderson, A. H. 1986. Haptoglobin-haemoglobin complex in human plasma inhibits endothelium dependent relaxation: evidence that endothelium derived relaxing factor acts as a local autocoid. Cardiovascular Research 20 (8) , pp. 549-556. 10.1093/cvr/20.8.549

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Abstract

Endothelium dependent relaxation of isometrically mounted rabbit aortic strip preparations was rapidly inhibited by human plasma at dilutions down to 1:1000. Gel filtration and ion exchange chromatography were used to demonstrate that this inhibitory activity was present in fractions containing haptoglobin. Purified haptoglobin itself possessed no inhibitory action against endothelium dependent relaxation, but the haptoglobin-haemoglobin complex did, consistent with the documented ability of haemoglobin to inhibit this phenomenon. The concentration of haemoglobin normally bound to haptoglobin is sufficient to account for the inhibitory properties of human plasma. This suggests that endothelium derived relaxing factor exerts no downstream intravascular effect in vivo and thus that its physiological dilator role is that of a local autocoid acting on subjacent smooth muscle.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Medicine
Subjects: R Medicine > R Medicine (General)
Uncontrolled Keywords: haptoglobin-haemoglobin complex; endothelium; derived relaxing factor; autocoid
Publisher: Elsevier
ISSN: 0008-6363
Last Modified: 04 Jun 2017 07:59
URI: http://orca-mwe.cf.ac.uk/id/eprint/71227

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