Voltage-dependent ATP-sensitive potassium channels of skeletal muscle membrane

Nature ◽  
1985 ◽  
Vol 316 (6030) ◽  
pp. 736-738 ◽  
Author(s):  
A. E. Spruce ◽  
N. B. Standen ◽  
P. R. Stanfield
Keyword(s):  
Skeletal Muscle ◽  
Potassium Channels ◽  
Muscle Membrane ◽  
Voltage Dependent

High-affinity [3H]PN200-110 and [3H]ryanodine binding to rabbit and frog skeletal muscle

1994 ◽  
Vol 266 (2) ◽  
pp. C462-C466 ◽  
Author(s):  
K. Anderson ◽  
A. H. Cohn ◽  
G. Meissner
Keyword(s):  
Skeletal Muscle ◽  
Rabbit Skeletal Muscle ◽  
Muscle Membrane ◽  
Scatchard Analysis ◽  
Physical Interaction ◽  
Frog Skeletal Muscle ◽  
Release Channel ◽  
High Affinity ◽  
Voltage Dependent ◽  
Student’S T

In vertebrate skeletal muscle, the voltage-dependent mechanism of sarcoplasmic reticulum (SR) Ca2+ release, commonly referred to as excitation-contraction (E-C) coupling, is mediated by the voltage-sensing dihydropyridine receptor (DHPR), which is believed to affect SR Ca2+ release through a physical interaction with the SR ryanodine receptor (RYR)/Ca2+ release channel. Scatchard analysis of ligand binding of [3H]PN200-110 to the DHPR and [3H]ryanodine to the RYR indicated the presence of high-affinity sites in muscle homogenates, with maximum binding (Bmax) values of 72 +/- 26 and 76 +/- 30 pmol/g wet wt for rabbit skeletal muscle, and 27 +/- 14 and 44 +/- 13 pmol/g wet wt for frog skeletal muscle, respectively. The Bmax values corresponded to a PN200-110-to-ryanodine binding ratio of 0.98 +/- 0.26 and 0.61 +/- 0.24 for rabbit and frog skeletal muscle, respectively, and were found by Student's t test to be significantly different (P < 0.02, n = 7). These results are compared with measurements with isolated rabbit skeletal muscle membrane fractions and discussed in relation to our current understanding of the mechanism of E-C coupling in skeletal muscle.

scholarly journals Interaction between tetraethylammonium and amino acid residues in the pore of cloned voltage-dependent potassium channels.

1991 ◽  
Vol 266 (12) ◽  
pp. 7583-7587
Author(s):  
M P Kavanaugh ◽  
M D Varnum ◽  
P B Osborne ◽  
M J Christie ◽  
A E Busch ◽  
...  
Keyword(s):  
Amino Acid ◽  
Potassium Channels ◽  
Amino Acid Residues ◽  
Voltage Dependent

scholarly journals Remodeling of Arterial Tone Regulation in Postnatal Development: Focus on Smooth Muscle Cell Potassium Channels

2021 ◽  
Vol 22 (11) ◽  
pp. 5413
Author(s):  
Anastasia A. Shvetsova ◽  
Dina K. Gaynullina ◽  
Olga S. Tarasova ◽  
Rudolf Schubert
Keyword(s):  
Smooth Muscle ◽  
Potassium Channels ◽  
Potassium Channel ◽  
Postnatal Development ◽  
Sympathetic Innervation ◽  
Treatment Strategies ◽  
Muscle Membrane ◽  
Postnatal Life ◽  
Vascular Control ◽  
Bkca Channels

Maturation of the cardiovascular system is associated with crucial structural and functional remodeling. Thickening of the arterial wall, maturation of the sympathetic innervation, and switching of the mechanisms of arterial contraction from calcium-independent to calcium-dependent occur during postnatal development. All these processes promote an almost doubling of blood pressure from the moment of birth to reaching adulthood. This review focuses on the developmental alterations of potassium channels functioning as key smooth muscle membrane potential determinants and, consequently, vascular tone regulators. We present evidence that the pattern of potassium channel contribution to vascular control changes from Kir2, Kv1, Kv7 and TASK-1 channels to BKCa channels with maturation. The differences in the contribution of potassium channels to vasomotor tone at different stages of postnatal life should be considered in treatment strategies of cardiovascular diseases associated with potassium channel malfunction.

scholarly journals Activation-inactivation of potassium channels and development of the potassium-channel spike in internally perfused squid giant axons.

1981 ◽  
Vol 78 (1) ◽  
pp. 43-61 ◽  
Author(s):  
I Inoue
Keyword(s):  
Potassium Channels ◽  
Potassium Channel ◽  
Voltage Clamp ◽  
Time Constant ◽  
Equilibrium Potential ◽  
Giant Axons ◽  
Dependent Inactivation ◽  
Voltage Dependent ◽  
Time Courses ◽  
Calcium Permeability

A spike that is the result of calcium permeability through potassium channels was separated from the action potential is squid giant axons internally perfused with a 30 mM NaF solution and bathed in a 100 mM CaCl2 solution by blocking sodium channels with tetrodotoxin. Currents through potassium channels were studied under voltage clamp. The records showed a clear voltage-dependent inactivation of the currents. The inactivation was composed of at least two components; one relatively fast, having a time constant of 20--30 ms, and the other very slow, having a time constant of 5--10 s. Voltage clamp was carried out with a variety of salt compositions in both the internal and external solutions. A similar voltage-dependent inactivation, also composed of the two components, was recognized in all the current through potassium channels. Although the direction and intensity of current strongly depended on the salt composition of the solutions, the time-courses of these currents at corresponding voltages were very similar. These results strongly suggest that the inactivation of the currents in attributable to an essential, dynamic property of potassium channels themselves. Thus, the generation of a potassium-channel spike can be understood as an event that occurs when the equilibrium potential across the potassium channel becomes positive.

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