Hypoxic pulmonary vasoconstriction (HPV) is initiated by the inhibition of several 4‐aminopyridine (4‐AP)‐sensitive, voltage‐gated, K+ channels (Kv). Several O2‐sensitive candidate channels (Kv1.2, Kv1.5, Kv2.1, and Kv3.1b) have been proposed, based on similarities between their characteristics in expression systems and the properties of the O2‐sensitive K+ current (IK) in pulmonary artery smooth muscle cells (PASMCs). We used gene targeting to delete Kv1.5 in mice by creating a SWAP mouse that is fu…
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