Abstract:
:Large-conductance Ca2+-dependent K+ channels (KCa), which are abundant on the sarcolemma of vascular myocytes, provide negative feedback via membrane hyperpolarization that limits Ca2+ entry through L-type Ca2+ channels (ICaL). We hypothesize that local accumulation of subsarcolemmal Ca2+ during ICaL openings amplifies this feedback. Our goal was to demonstrate that Ca2+ entry through voltage-gated ICaL channels can stimulate adjacent KCa channels by a localized interaction in enzymatically isolated rabbit coronary arterial myocytes voltage clamped in whole-cell or in cell-attached patch clamp mode. During slow-voltage-ramp protocols, we identified an outward KCa current that is activated by a subsarcolemmal Ca2+ pool dissociated from bulk cytosolic Ca2+ pool (measured with indo 1) and is dependent on L-type Ca2+ channel activity. Transient activation of unitary KCa channels in cell-attached patches could be detected during long step depolarizations to +40 mV (holding potential, -40 mV; 219 pS in near-symmetrical K+). This local interaction between the channels required the presence of Ca2+ in the pipette solution, was enhanced by the ICaL agonist Bay K 8644, and persisted after impairment of the sarcoplasmic reticulum by incubation with 10 micromol/L ryanodine and 30 micromol/L cyclopiazonic acid for at least 60 minutes. Furthermore, we provide the first direct evidence of simultaneous openings of single KCa (67 pS) and ICaL (3.9 pS) channels in near-physiological conditions, near resting membrane potential. Our data imply a novel sensitive mechanism for regulating resting membrane potential and tone in vascular smooth muscle.
journal_name
Circ Resjournal_title
Circulation researchauthors
Guia A,Wan X,Courtemanche M,Leblanc Ndoi
10.1161/01.res.84.9.1032subject
Has Abstractpub_date
1999-05-14 00:00:00pages
1032-42issue
9eissn
0009-7330issn
1524-4571journal_volume
84pub_type
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更新日期:2017-03-31 00:00:00
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更新日期:2017-02-17 00:00:00
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更新日期:1991-10-01 00:00:00
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更新日期:2015-01-16 00:00:00
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更新日期:1982-08-01 00:00:00
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更新日期:2013-06-07 00:00:00
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更新日期:1990-02-01 00:00:00
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