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- W2100620173 abstract "Large-conductance Ca 2+ -activated K + (BK) channels are composed of pore-forming α-subunits and accessory β 1 -subunits that modulate Ca 2+ sensitivity. BK channels regulate arterial myogenic tone and renal Na + clearance/K + reabsorption. Previous studies using indirect or short-term blood pressure measurements found that BK channel β 1 -subunit knockout (BK β 1 -KO) mice were hypertensive. We evaluated 24-h mean arterial pressure (MAP) and heart rate in BK β 1 -KO mice using radiotelemetry. BK β 1 -KO mice did not have a higher 24-h average MAP when compared with wild-type (WT) mice, although MAP was ∼10 mmHg higher at night. The dose-dependent peak declines in MAP by nifedipine were only slightly larger in BK β 1 -KO mice. In BK β 1 -KO mice, giving 1% NaCl to mice to drink for 7 days caused a transient (5 days) elevation of MAP (∼5 mmHg); MAP returned to pre-saline levels by day 6. BK β 1 -KO mesenteric arteries in vitro demonstrated diminished contractile responses to paxilline, increased reactivity to Bay K 8644 and norepinephrine (NE), and maintained relaxation to isoproterenol. Paxilline and Bay K 8644 did not constrict WT or BK β 1 -KO mesenteric veins (MV). BK β 1 -subunits are not expressed in MV. The results indicate that BK β 1 -KO mice are not hypertensive on normal or high-salt intake. BK channel deficiency increases arterial reactivity to NE and L-type Ca 2+ channel function in vitro, but the L-type Ca 2+ channel modulation of MAP is not altered in BK β 1 -KO mice. BK and L-type Ca 2+ channels do not modulate murine venous tone. It appears that selective loss of BK channel function in arteries only is not sufficient to cause sustained hypertension." @default.
- W2100620173 created "2016-06-24" @default.
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- W2100620173 date "2011-02-01" @default.
- W2100620173 modified "2023-09-25" @default.
- W2100620173 title "Large-conductance Ca<sup>2+</sup>-activated K<sup>+</sup>channel β<sub>1</sub>-subunit knockout mice are not hypertensive" @default.
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- W2100620173 doi "https://doi.org/10.1152/ajpheart.00975.2010" @default.
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