Title : Acute hypoxia selectively inhibits KCNA5 channels in pulmonary artery smooth muscle cells.

Pub. Date : 2006 Mar

PMID : 16236819






5 Functional Relationships(s)
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1 We have shown that acute hypoxia selectively inhibits I(K(V)) through KCNA5 channels in PASMC. pasmc potassium voltage-gated channel subfamily A member 5 Homo sapiens
2 Overexpression of the human KCNA5 gene increased I(K(V)) and caused membrane hyperpolarization in HEK-293, COS-7, and rat MASMC and PASMC. pasmc potassium voltage-gated channel subfamily A member 5 Homo sapiens
3 However, overexpression of KCNA5 in PASMC conferred its sensitivity to hypoxia. pasmc potassium voltage-gated channel subfamily A member 5 Homo sapiens
4 Reduction of Po(2) from 145 to 35 mmHg reduced I(K(V)) by approximately 40% in rat PASMC transfected with human KCNA5 but had no effect on I(K(V)) in KCNA5-transfected rat MASMC (or HEK and COS cells). pasmc potassium voltage-gated channel subfamily A member 5 Homo sapiens
5 These results indicate that KCNA5 is an important Kv channel that regulates resting membrane potential and that acute hypoxia selectively reduces KCNA5 channel activity in PASMC relative to MASMC and other cell types. pasmc potassium voltage-gated channel subfamily A member 5 Homo sapiens