Key result
The activity of whole cell and single BK channels was significantly higher in cerebral artery smooth muscle cells than in pulmonary artery smooth muscle cells, primarily determined by differential beta1-subunit function.
p-value: p=<0.05
BK channel activity is intrinsically higher in cerebral versus pulmonary artery smooth muscle cells due to differential β1-subunit expression, which selectively regulates systemic but not pulmonary blood pressure.
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May inform artery-specific vasodilator strategies; hypothesis-generating for β1-subunit roles in human vascular disease.
Zheng et al. (2013) studied BK channel activity in vascular smooth muscle cells. Cerebral artery smooth muscle cells (CASMCs) vs Pulmonary artery smooth muscle cells (PASMCs) vs. PASMCs was evaluated on BK channel open probability and whole cell currents (p=<0.05). The activity of whole cell and single BK channels was significantly higher in cerebral artery smooth muscle cells than in pulmonary artery smooth muscle cells, primarily determined by differential beta1-subunit function.
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