This JGP study (Collaço et al. https://doi.org/10.1085/jgp.202413563) reveals that in addition to voltage-gated Ca2+ and K+ channels, ω-grammotoxin-SIA also inhibits voltage-gated Na+ channel currents.
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http://dx.doi.org/10.1085/jgp.202413665 | DOI Listing |
J Gen Physiol
October 2024
Science Writer, Rockefeller University Press, New York, NY, USA.
Neuroscience
April 2007
Department of Bio-signaling Physiology, Graduate School of Medical Sciences, Kyushu University, Fukuoka 812-8582, Japan.
The high potassium-induced potentiation of spontaneous glycine release in extracellular Ca2+-free conditions was studied in mechanically dissociated rat spinal dorsal horn neurons using whole-cell patch-clamp technique. Elevating extracellular K+ concentration reversibly increased the frequency of spontaneous glycinergic inhibitory postsynaptic currents (IPSCs) in the absence of extracellular Ca2+. Blocking voltage-dependent Na+ channels (tetrodotoxin) and Ca2+ channels (nifedipine and omega-grammotoxin-SIA) had no effect on this potassium-induced potentiation of glycine-release.
View Article and Find Full Text PDFJ Physiol
August 1999
Department of Pharmacology, University of Minnesota Medical School, 3-249 Millard Hall, 435 Delaware Street SE, Minneapolis, MN 55455, USA.
1. Store-operated, voltage-independent Ca2+ channels are activated by depletion of intracellular Ca2+ stores and mediate Ca2+ influx into non-excitable cells at resting membrane potential. We used microfluorimetry, patch-clamp and Mn2+-quench techniques to explore the possibility that a similar mechanism exists in rat dorsal root ganglion (DRG) neurones in primary culture.
View Article and Find Full Text PDF1. Intracellular recording techniques were used to study neurotransmitter release mechanisms in postganglionic sympathetic nerve terminals of the rat isolated anococcygeus muscle. 2.
View Article and Find Full Text PDFJ Membr Biol
December 1996
Biophysical Sciences, 120 Cary Hall, SUNY at Buffalo, Buffalo, NY 14214, USA.
As predicted from stretch-induced changes of rate and rhythm in the heart, acutely isolated embryonic chick heart cells exhibit whole-cell mechanosensitive currents. These currents were evoked by pressing on cells with a fire polished micropipette and measured through a perforated patch using a second pipette. The currents were carried by Na+ and K+ but not Cl-, and were independent of external Ca2+.
View Article and Find Full Text PDFEnter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!