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Endothelium-derived hyperpolarising factors and associated pathways: a synopsis
Pflügers Archiv, 2010-05, Vol.459 (6), p.863-879
[Peer Reviewed Journal]
Springer-Verlag 2010 ;ISSN: 0031-6768 ;EISSN: 1432-2013 ;DOI: 10.1007/s00424-010-0817-1 ;PMID: 20383718
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Title:
Endothelium-derived hyperpolarising factors and associated pathways: a synopsis
Author:
Edwards, Gillian
;
Félétou, Michel
;
Weston, Arthur H.
Subjects:
Animals
;
Apamin - pharmacology
;
Biological Factors - physiology
;
Biomedical and Life Sciences
;
Biomedicine
;
Carbon Monoxide - physiology
;
Cell Biology
;
Eicosanoids - physiology
;
Endothelium, Vascular - physiology
;
Endothelium-Dependent Relaxing Factors - physiology
;
Epoprostenol - physiology
;
Human Physiology
;
Humans
;
Hydrogen Peroxide - metabolism
;
Invited Review
;
Molecular Medicine
;
Muscle Cells - physiology
;
Natriuretic Peptide, C-Type - physiology
;
Neurosciences
;
Nitric oxide
;
Nitric Oxide - physiology
;
Potassium - physiology
;
Potassium Channel Blockers - pharmacology
;
Potassium Channels - physiology
;
Potassium Channels, Calcium-Activated - physiology
;
Pyrazoles
;
Receptors
;
Small-Conductance Calcium-Activated Potassium Channels - physiology
;
Sodium-Potassium-Exchanging ATPase - physiology
Is Part Of:
Pflügers Archiv, 2010-05, Vol.459 (6), p.863-879
Description:
The term endothelium-derived hyperpolarising factor (EDHF) was introduced in 1987 to describe the hypothetical factor responsible for myocyte hyperpolarisations not associated with nitric oxide (EDRF) or prostacyclin. Two broad categories of EDHF response exist. The classical EDHF pathway is blocked by apamin plus TRAM-34 but not by apamin plus iberiotoxin and is associated with endothelial cell hyperpolarisation. This follows an increase in intracellular [Ca 2+ ] and the opening of endothelial SK Ca and IK Ca channels preferentially located in caveolae and in endothelial cell projections through the internal elastic lamina, respectively. In some vessels, endothelial hyperpolarisations are transmitted to myocytes through myoendothelial gap junctions without involving any EDHF. In others, the K + that effluxes through SK Ca activates myocytic and endothelial Ba 2+ -sensitive K IR channels leading to myocyte hyperpolarisation. K + effluxing through IK Ca activates ouabain-sensitive Na + /K + -ATPases generating further myocyte hyperpolarisation. For the classical pathway, the hyperpolarising “factor” involved is the K + that effluxes through endothelial K Ca channels. During vessel contraction, K + efflux through activated myocyte BK Ca channels generates intravascular K + clouds. These compromise activation of Na + /K + -ATPases and K IR channels by endothelium-derived K + and increase the importance of gap junctional electrical coupling in myocyte hyperpolarisations. The second category of EDHF pathway does not require endothelial hyperpolarisation. It involves the endothelial release of factors that include NO, HNO, H 2 O 2 and vasoactive peptides as well as prostacyclin and epoxyeicosatrienoic acids. These hyperpolarise myocytes by opening various populations of myocyte potassium channels, but predominantly BK Ca and/or K ATP , which are sensitive to blockade by iberiotoxin or glibenclamide, respectively.
Publisher:
Berlin/Heidelberg: Springer-Verlag
Language:
English
Identifier:
ISSN: 0031-6768
EISSN: 1432-2013
DOI: 10.1007/s00424-010-0817-1
PMID: 20383718
Source:
AUTh Library subscriptions: ProQuest Central
MEDLINE
Alma/SFX Local Collection
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