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Open Channel Block of Kv3.1 Currents by Genistein, a Tyrosine Kinase Inhibitor
BokHeeChoi, JiHyunPark, SangJuneHahn 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 8 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2006, Vol.10 No.2 3 71-78 (8 pages)
a widely used tyrosine kinase inhibitor, on cloned Shaw-type K currents, Kv3.1 which were stably expressed in Chinese hamster ovary (CHO) cells, using the whole-cell configuration of patch-clamp techniques. In whole-cell recordings, genistein at external concentrations from 10 to 100μM accelerated the rate of inactivation of Kv3.1 currents, thereby concentration-dependently reducing the current at the end of depolarizing pulse with an IC50 value of 15.71⁑0.67μM and a Hill... -
Direct Block of Cloned K+ Channels, Kv1.5 and Kv1.3, by Cyclosporin A, Independent of Calcineurin Inhibition
BokHeeChoi, SangJuneHahn 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 10 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2005, Vol.9 No.6 7 353-362 (10 pages)
The interaction of cyclosporine A (CsA), an immunosuppressant, with rat brain Kv1.5 (Kv1.5) channels, which were stably expressed in Chinese hamster ovary cells, was investigated using the whole-cell patch-clamp technique. CsA reversibly blocked Kv1.5 currents at 50 mV in a reversible concentration- dependent manner with an apparent IC50 of 1.0μM. Other calcineurin inhibitors (cypermethrin, autoinhibitory peptide) had no effect on Kv1.5 and did not prevent the inhibitory effect of CsA.... -
Na+-Ca2+ Exchange Curtails Ca2+ before Its Diffusion to Global Ca2+i in the Rat Ventricular Myocyte
Sung-WanAhnChangMannKo 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 8 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2005, Vol.9 No.2 4 95-102 (8 pages)
in the heart. This possibility was examined in this study by comparing NCX-induced extrusion of Ca2 after its release from SR in the presence and absence of global Ca2i transient in the isolated single rat ventricular myocytes by using patch-clamp technique in a whole-cell configuration. Global Ca2i transient was controlled by an internal dialysis with different concentrations of BAPTA added in the pipette. During stimulation with a ramp pulse from 100 mV to 10... -
Buffering Contribution of Mitochondria to the [Ca2+]i Increase by Ca2+ Influx through Background Nonselective Cation Channels in Rabbit Aortic Endothelial Cells
YoungChulKim, SangJinLee, KiWhanKim 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 8 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2005, Vol.9 No.1 5 29-36 (8 pages)
To prove the buffering contribution of mitochondria to the increase of intracellular Ca2+ level ([Ca2+]i) via background nonselective cation channel (background NSCC), we examined whether inhibition of mitochondria by protonophore carbonylcyanide m-chlorophenylhydrazone (CCCP) affects endothelial Ca2+ entry and Ca2+ buffering in freshly isolated rabbit aortic endothelial cells (RAECs). The ratio of fluorescence by fura-2 AM (R340/380) was measured in RAECs. Biological state was checked by... -
Presynaptic Mechanism Underlying Regulation of Transmitter Release by G Protein Coupled Receptors
TomoyukiTakahashi, YoshinaoKajikawa, MasahiroKimura, NaotoSaitoh, TetsuhiroTsujimoto 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 8 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2004, Vol.8 No.2 1 69-76 (8 pages)
A variety of G protein coupled receptors (GPCRs) are expressed in the presynaptic terminals of central and peripheral synapses and play regulatory roles in transmitter release. The patch-clamp whole-cell recording technique, applied to the calyx of Held presynaptic terminal in brainstem slices of rodents, has made it possible to directly examine intracellular mechanisms underlying the GPCR-mediated presynaptic inhibition. At the calyx of Held, bath-application of agonists for GPCRs such as GABAB... -
Electrophysiological and Morphological Classification of Inhibitory Interneurons in Layer II/III of the Rat Visual Cortex
Duck-JooRhie, HoYoungKang, GyeongRyulRyu, Myung-JunKim, ShinHeeYoon, SangJuneHahn, DoSikMin, Yang-HyeokJo, Myung-SukKim 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 7 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2003, Vol.7 No.6 5 317-323 (7 pages)
the rat primary visual cortex, using patch-clamp recording and confocal reconstruction, and classified inhibitory interneurons into fast spiking (FS), late spiking (LS), burst spiking (BS), and regular spiking non-pyramidal (RSNP) neurons according to their electrophysiological characteristics. Global parameters to identify inhibitory interneurons were resting membrane potential (＞70 mV) and action potential (AP) width (＜0.9 msec at half amplitude). FS could be differentiated from LS,... -
Effects of Noradrenaline on the Membrane Potential of Prostatic Neuroendocrine Cells of Rat
JunHeeKim, SunYoungShin, Dae-YongUhm, SungJoonKim 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 6 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2003, Vol.7 No.1 9 47-52 (6 pages)
The prostate gland contains numerous neuroendocrine cells that are believed to influence the function of the prostate gland. Our recent study demonstrated the expression of both α1- and α2-ARs, signaling the release of stored Ca2 and the inhibition of N-type Ca2 channels, respectively, in rat prostate neuroendocrine cells (RPNECs). In this study, the effects of NA on the resting membrane potential (RMP) of RPNECs were investigated using a whole-cell patch clamp method. Fresh... -
Increase of Intracellular Ca2+ Concentration Induced by Lysophosphatidylcholine in Murine Aortic Endothelial Cells
MeiHongZhu, SungJinPark, HyunJinKim, DongKiYang, SukHyoSuh, InsukSo, KiWhanKim 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 8 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2002, Vol.6 No.2 5 93-100 (8 pages)
Effects of oxidized low-density lipoprotein (ox-LDL), l-α-stearoyl-lysophosphatidylcholine (LPC), on intracellular Ca2 concentration were examined in mouse endothelial cells by measuring intracellular Ca2 concentration ([Ca2]i) with fura 2-AM and reverse transcription-polymerase chain reaction (RT-PCR). LPC increased [Ca2]i under the condition of 1.5 mM [Ca2]o but did not show any effect under the nominally Ca2-free condition. Even after the store... -
Effects of Prostaglandin F2α on Membrane Potentials and K+ Currents in Rabbit Middle Cerebral Arterial Cells
NariKim, JinHan, WonGueKim, EuiyongKim 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 9 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2000, Vol.4 No.4 5 301-309 (9 pages)
F2α (PGF2α) on membrane potentials, Ca2-activated K (KCa) channels, and delayed rectifier K (KV) channels using the patch-clamp technique in single rabbit middle cerebral arterial smooth muscle cells. PGF2α significantly hyperpolarized membrane potentials and increased outward whole-cell K currents. PGF2α increased open-state probability of KCa channels without the change of the open and closed kinetics. PGF2α increased the amplitudes of KV currents with a... -
Relatoinship between Sarcoplasmic Reticular Calcium Release and Na+-Ca2+ Exchange in the Rat Myocardial Contraction
Eun-GiKim, SoonJinKim, ChangMannKo 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 14 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2000, Vol.4 No.3 4 197-210 (14 pages)
Suppressive role of Na-Ca2 exchange in myocardial tension generation was examined in the negative frequency-force relationship (FFR) of electric field stimulated left atria (LA) from postnatal developing rat heart and in the whole-cell clamped adult rat ventricular myocytes with high concentration of intracellular Ca2 buffer (14 mM EGTA). LA twitch amplitudes, which were suppressed by cyclopiazonic acid in a postnatal age-dependent manner, elicited frequency-dependent and...
