Activation of Kv7.5 potassium channels in vascular smooth muscle cells via cAMP/protein kinase A.

What is it about?

Kv7 potassium channels are important regulators of vascular smooth muscle contraction. They have been proposed as mediators for beta-adrenergic receptor-induced vascular smooth muscle relaxation, though it is not clear what signaling pathway is responsible or which Kv7 channel subunits are targeted. The findings presented in this research article provide evidence that Kv7.5 channels, but not Kv7.4 channels, in vascular smooth muscle are activated in response to beta-adrenergic receptor stimulation via elevation of cyclic AMP levels and protein kinase A-mediated phosphorylation of the Kv7.5 channel subunits.

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Why is it important?

Relaxation of vascular smooth muscle in response to beta-adrenergic receptor stimulation is an important physiological mechanism for maintaining appropriate blood flow to tissues, and it is also a potential mechanism for therapeutic targeting to treat cardiovascular diseases. The differences in Kv7 channel subunit responses revealed in this study may have important implications in terms of arterial function, as the Kv7 channel subunit expression patterns may differ among vascular beds and may change during development or with disease.