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Hypoxia increases the activity of Ca(2+)-sensitive K+ channels in cat cerebral arterial muscle cell membranes. Pflugers Arch 1994 Oct;428(5-6):621-30 PMID: 7838685

Abstract

The cellular mechanisms mediating hypoxia-induced dilation of cerebral arteries have remained unknown, but may involve modulation of membrane ionic channels. The present study was designed to determine the effect of reduced partial pressure of O2, PO2, on the predominant K+ channel type recorded in cat cerebral arterial muscle cells, and on the diameter of pressurized cat cerebral arteries. A K(+)-selective single-channel current with a unitary slope conductance of 215 pS was recorded from excised inside-out patches of cat cerebral arterial muscle cells using symmetrical KCl (145 mM) solution. The open state probability (NPo) of this channel displayed a strong voltage dependence, was not affected by varying intracellular ATP concentration [(ATP]i) between 0 and 100 microM, but was significantly increased upon elevation of intracellular free Ca2+ concentration ([Ca2+]i). Low concentrations of external tetraethylammonium (0.1-3 mM) produced a concentration-dependent reduction of the unitary current amplitude of this channel. In cell-attached patches, where the resting membrane potential was set to zero with a high KCl solution, reduction of O2 from 21% to < 2% reversibly increased the NPo, mean open time, and event frequency of the Ca(2+)-sensitive, high-conductance single-channel K+ current recorded at a patch potential of +20 mV. A similar reduction in PO2 also produced a transient increase in the activity of the 215-pS K+ channel measured in excised inside-out patches bathed in symmetrical 145 mM KCl, an effect which was diminished, or not seen, during a second application of hypoxic superfusion. Hypoxia had no effect on [Ca2+]i or intracellular pH (pHi) of cat cerebral arterial muscle cells, as measured using Ca(2+)- or pH-sensitive fluorescent probes. Reduced PO2 caused a significant dilation of pressurized cerebral arterial segments, which was attenuated by pretreatment with 1 mM tetraethylammonium. These results suggest that reduced PO2 increases the activity of a high-conductance, Ca(2+)-sensitive K+ channel in cat cerebral arterial muscle cells, and that these effects are mediated by cytosolic events independent of changes in [Ca2+]i and pHi.

Author List

Gebremedhin D, Bonnet P, Greene AS, England SK, Rusch NJ, Lombard JH, Harder DR

Authors

Debebe Gebremedhin PhD Associate Professor in the Physiology department at Medical College of Wisconsin
Andrew S. Greene PhD Interim Vice Chair, Chief, Professor in the Biomedical Engineering department at Medical College of Wisconsin
David R. Harder PhD Associate Dean, Adjunct Professor in the Physiology department at Medical College of Wisconsin
Julian H. Lombard PhD Professor in the Physiology department at Medical College of Wisconsin

MESH terms used to index this publication - Major topics in bold

Animals
Anoxia
Brain
Calcium Channels
Cats
Cell Hypoxia
Cell Membrane
Electric Conductivity
Female
Male
Muscle, Smooth, Vascular
Potassium Channels
Tetraethylammonium
Tetraethylammonium Compounds



View this publication's entry at the Pubmed website PMID: 7838685
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