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Modulation of calcium-activated potassium channels.
Weiger TM, Hermann A, Levitan IB. Weiger TM, et al. J Comp Physiol A Neuroethol Sens Neural Behav Physiol. 2002 Mar;188(2):79-87. doi: 10.1007/s00359-002-0281-2. Epub 2002 Jan 29. J Comp Physiol A Neuroethol Sens Neural Behav Physiol. 2002. PMID: 11919690 Review.
Potassium currents play a critical role in action potential repolarization, setting of the resting membrane potential, control of neuronal firing rates, and regulation of neurotransmitter release. ...In this review we discuss a few selected examples of the modulatio …
Potassium currents play a critical role in action potential repolarization, setting of the resting membrane potential, control of neu …
Sarcoplasmic calcium-binding protein-immunoreactive material in the central nervous system of the snail, Helix pomatia.
Kerschbaum HH, Kainz V, Hermann A. Kerschbaum HH, et al. Brain Res. 1992 Dec 4;597(2):339-42. doi: 10.1016/0006-8993(92)91491-v. Brain Res. 1992. PMID: 1473005
In Helix pomatia a 10 kDa sarcoplasmic calcium binding protein I (SCP I)-immunoreactive material was localized immunologically in neurons of the central nervous system, including the electrically silent serotonergic metacerebral giant neuron. Antisera against sarcoplasmic …
In Helix pomatia a 10 kDa sarcoplasmic calcium binding protein I (SCP I)-immunoreactive material was localized immunologically in neu …
Acetaldehyde-ethanol interactions on calcium-activated potassium (BK) channels in pituitary tumor (GH3) cells.
Handlechner AG, Hermann A, Fuchs R, Weiger TM. Handlechner AG, et al. Front Behav Neurosci. 2013 Jun 14;7:58. doi: 10.3389/fnbeh.2013.00058. eCollection 2013. Front Behav Neurosci. 2013. PMID: 23785316 Free PMC article.
In the presence of intracellular ACA this increment of BK activity was suppressed in a dose- as well as calcium-dependent manner. ...In contrast BK activation by a hypotonic solution was not affected by internal ACA. CONCLUSIONS: Our data suggest an inhibitory impac …
In the presence of intracellular ACA this increment of BK activity was suppressed in a dose- as well as calcium-dependent manner. ... …
S100 calcium binding proteins and ion channels.
Hermann A, Donato R, Weiger TM, Chazin WJ. Hermann A, et al. Front Pharmacol. 2012 Apr 25;3:67. doi: 10.3389/fphar.2012.00067. eCollection 2012. Front Pharmacol. 2012. PMID: 22539925 Free PMC article.
S100 Ca(2+)-binding proteins have been associated with a multitude of intracellular Ca(2+)-dependent functions including regulation of the cell cycle, cell differentiation, cell motility and apoptosis, modulation of membrane-cytoskeletal interactions, transduction of intra …
S100 Ca(2+)-binding proteins have been associated with a multitude of intracellular Ca(2+)-dependent functions including regulation o …
Nitric oxide decreases a calcium-activated potassium current via activation of phosphodiesterase 2 in Helix U-cells.
Schrofner S, Zsombok A, Hermann A, Kerschbaum HH. Schrofner S, et al. Brain Res. 2004 Feb 27;999(1):98-105. doi: 10.1016/j.brainres.2003.11.038. Brain Res. 2004. PMID: 14746926
Using a two-electrode voltage-clamp technique, we activated a KCa-current either by opening of endogenous voltage-gated Ca2+-channels during depolarizing voltage steps or by ionophoretic injection of Ca2+ via a third electrode containing 100 mM Ca2+. ...These …
Using a two-electrode voltage-clamp technique, we activated a KCa-current either by opening of endogenous voltage-gated Ca2+-c …
Homocysteine augments BK channel activity and decreases exocytosis of secretory granules in rat GH3 cells.
Gaifullina AS, Yakovlev AV, Mustafina AN, Weiger TM, Hermann A, Sitdikova GF. Gaifullina AS, et al. FEBS Lett. 2016 Oct;590(19):3375-3384. doi: 10.1002/1873-3468.12381. Epub 2016 Sep 15. FEBS Lett. 2016. PMID: 27586872
A major finding of our study indicates that short-term application of Hcy increased the open probability of oxidized BK channels in inside-out recordings. ...This decrease was partially prevented by the BK channel inhibitor paxilline and fully prevented by N-acetylcysteine
A major finding of our study indicates that short-term application of Hcy increased the open probability of oxidized BK channels in i
Hydrogen sulfide induces hyperpolarization and decreases the exocytosis of secretory granules of rat GH3 pituitary tumor cells.
Mustafina AN, Yakovlev AV, Gaifullina ASh, Weiger TM, Hermann A, Sitdikova GF. Mustafina AN, et al. Biochem Biophys Res Commun. 2015 Oct 2;465(4):825-31. doi: 10.1016/j.bbrc.2015.08.095. Epub 2015 Aug 28. Biochem Biophys Res Commun. 2015. PMID: 26319431
We suggest that H2S induces hyperpolarization of GH3 cells by activation of KATP channels which results in a truncation of spontaneous action potentials and a decrease of hormone release....
We suggest that H2S induces hyperpolarization of GH3 cells by activation of KATP channels which results in a truncation of spontaneou …
Oxidative Stress and Maxi Calcium-Activated Potassium (BK) Channels.
Hermann A, Sitdikova GF, Weiger TM. Hermann A, et al. Biomolecules. 2015 Aug 17;5(3):1870-911. doi: 10.3390/biom5031870. Biomolecules. 2015. PMID: 26287261 Free PMC article. Review.
In this chapter we summarize effects of oxidative stress and redox mechanisms on some ion channels, in particular on maxi calcium-activated potassium (BK) channels which play an outstanding role in a plethora of physiological and pathophysiological functions in almost all …
In this chapter we summarize effects of oxidative stress and redox mechanisms on some ion channels, in particular on maxi calcium-activated …
Cell proliferation, potassium channels, polyamines and their interactions: a mini review.
Weiger TM, Hermann A. Weiger TM, et al. Amino Acids. 2014 Mar;46(3):681-8. doi: 10.1007/s00726-013-1536-7. Epub 2013 Jul 3. Amino Acids. 2014. PMID: 23820618 Review.
Quinidine, a general K(+) channel blocker, was found to reduce putrescine concentrations, to block the ornithine decarboxylase and halt cell proliferation. ...On the other hand, a block or a deletion of K(+) channels may cause a decrease of the polyami …
Quinidine, a general K(+) channel blocker, was found to reduce putrescine concentrations, to block the ornithine decarboxylase and ha …
Hydrogen sulfide increases calcium-activated potassium (BK) channel activity of rat pituitary tumor cells.
Sitdikova GF, Weiger TM, Hermann A. Sitdikova GF, et al. Pflugers Arch. 2010 Feb;459(3):389-97. doi: 10.1007/s00424-009-0737-0. Epub 2009 Oct 4. Pflugers Arch. 2010. PMID: 19802723
In single channel recordings, H(2)S increased BK channel activity in a concentration-dependent manner. Hydrogen sulfide induced a reversible increase in channel open probability in a voltage-dependent, but calcium independent manner. ...
In single channel recordings, H(2)S increased BK channel activity in a concentration-dependent manner. Hydrogen sulfide induced a
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