منابع مشابه
Potassium ions as vasodilators: role of inward rectifier potassium channels.
External potassium ions have long been known as mediators of vasodilation of several vascular beds, including the coronary and cerebral circulations.1–6 Indeed, potassium ions have been viewed as communicators of the metabolic state of the cells that surround blood vessels. For example, release of potassium ions from neurons is communicated through glial cells to regulate cerebral artery diamet...
متن کاملModulation of jellyfish potassium channels by external potassium ions.
The amplitude of an A-like potassium current (I(Kfast)) in identified cultured motor neurons isolated from the jellyfish Polyorchis penicillatus was found to be strongly modulated by extracellular potassium ([K(+)](out)). When expressed in Xenopus oocytes, two jellyfish Shaker-like genes, jShak1 and jShak2, coding for potassium channels, exhibited similar modulation by [K(+)](out) over a range ...
متن کاملSynaptic feed-backs mediated by potassium ions.
Repetitive activity of the neuromuscular system and of neuronal centers leads to K+ efflux from excited cells and to its accumulation within extracellular spaces and synaptic clefts, especially during the generation of postsynaptic responses such as end-plate potentials or excitatory postsynaptic potentials. K+ ions accumulated within the synaptic cleft during activity modulate the transmitter ...
متن کاملStabilization of Streptolysin S by Potassium Ions
Potassium ions, and to a less extent, ammonium, magnesium, and barium ions, protect streptolysin S against thermal inactivation.
متن کاملEffects of Sodium and Potassium Ions
1. A study has been made of the oxygen consumption of kidney homogenates in relation to the ADP concentration as regulated by the cell-membrane adenosine triphosphatase. Stimulation of this enzymic activity by Na+ and K+ caused parallel increases in oxygen consumption and ADP concentration. Similarly, inhibition with ouabain caused a parallel fall. The membrane adenosine triphosphatase concerne...
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ژورنال
عنوان ژورنال: Nature Reviews Neuroscience
سال: 2001
ISSN: 1471-003X,1471-0048
DOI: 10.1038/35097536