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• W2086875100 endingPage "562" @default.
• W2086875100 startingPage "545" @default.
• W2086875100 abstract "The three subtypes of calcium‐activated potassium channels (K Ca ) of large, intermediate and small conductance (BK Ca , IK Ca and SK Ca ) are present in the vascular wall. In healthy arteries, BK Ca channels are preferentially expressed in vascular smooth muscle cells, while IK Ca and SK Ca are preferentially located in endothelial cells. The activation of endothelial IK Ca and SK Ca contributes to nitric oxide (NO) generation and is required to elicit endothelium‐dependent hyperpolarizations. In the latter responses, the hyperpolarization of the smooth muscle cells is evoked either via electrical coupling through myo‐endothelial gap junctions or by potassium ions, which by accumulating in the intercellular space activate the inwardly rectifying potassium channel Kir2.1 and/or the Na + /K + ‐ATPase. Additionally, endothelium‐derived factors such as cytochrome P450‐derived epoxyeicosatrienoic acids and under some circumstances NO, prostacyclin, lipoxygenase products and hydrogen peroxide (H 2 O 2 ) hyperpolarize and relax the underlying smooth muscle cells by activating BK Ca . In contrast, cytochrome P450‐derived 20‐hydroxyeicosatetraenoic acid and various endothelium‐derived contracting factors inhibit BK Ca . Aging and cardiovascular diseases are associated with endothelial dysfunctions that can involve a decrease in NO bioavailability, alterations of EDHF‐mediated responses and/or enhanced production of endothelium‐derived contracting factors. Because potassium channels are involved in these endothelium‐dependent responses, activation of endothelial and/or smooth muscle K Ca could prevent the occurrence of endothelial dysfunction. Therefore, direct activators of these potassium channels or compounds that regulate their activity or their expression may be of some therapeutic interest. Conversely, blockers of IK Ca may prevent restenosis and that of BK Ca channels sepsis‐dependent hypotension. Mandarin translation of abstract" @default.
• W2086875100 created "2016-06-24" @default.
• W2086875100 creator A5033869623 @default.
• W2086875100 date "2009-02-01" @default.
• W2086875100 modified "2023-10-17" @default.
• W2086875100 title "Calcium-activated potassium channels and endothelial dysfunction: therapeutic options?" @default.
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