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Muscarine M2 Receptor-mediated Presynaptic Inhibition of GABAergic Transmission in Rat Meynert Neurons
Il-SungJangNorioAkaike 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 8 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2002, Vol.6 No.2 1 63-70 (8 pages)
of the Meynert neurons using the conventional whole-cell patch recording configuration. Muscarine (10μM) reversibly and concentration-dependently decreased mIPSC frequency without affecting the current amplitude distribution. Muscarine action on GABAergic mIPSCs was completely blocked by 1μM methoctramine, a selective M2 receptor antagonist, but not by 1μM pirenzepine, a selective M1 receptor antagonist. NEM (10μM), a G-protein uncoupler, attenuated the inhibitory action of muscarine on... -
Forward-Mode Na+-Ca2+ Exchange during Depolarization in the Rat Ventricular Myocytes with High EGTA
Eun-GiKim, ChangMannKo 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 8 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2001, Vol.5 No.6 5 487-494 (8 pages)
5 mM NiCl2, or by Na and Ca2 omission, but not by 0.1μM isoproterenol. The I∼V relationship of the caffeine-induced current elicited inward current from 45 mV to 3 mV with the peak at 25 mV. Taken together, it is concluded that, during activation of the rat ventricular myocyte, forward-mode Na-Ca2 exchange extrudes a fraction of Ca2 released from sarcoplasmic reticulum mainly by voltage-sensitive release mechanism in a micro-domain in the... -
Activation of ATP-sensitive Potassium Channels by the Predominant Metabolite of Isoflurane in Rabbit Ventricular Myocytes
JinHan, NariKim, EuiyongKim, SungjuKim, KangheeCho 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 11 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2001, Vol.5 No.2 7 165-175 (11 pages)
Background: Recent in vivo experimental evidence suggests that isoflurane-induced cardioprotection may involve KATP channel activation. However, it was demonstrated that isoflurane inhibited KATP channel activities in the inside-out patch mode. To explain this discrepancy, the present investigation tested the hypothesis that a metabolite of isoflurane, trifluoroacetic acid (TFA), contributes to isoflurnae-induced cardioprotection via KATP channel activation during myocardial ischemia and... -
Block of ATP-Sensitive K Channels Expressed in Xenopus Oocytes by Dimethyl Sulfoxide
JinBongParkSooWanChae 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 7 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2001, Vol.5 No.2 6 157-163 (7 pages)
The effects of dimethyl sulfoxide (DMSO) were studied in two groups of Xenopus oocytes, one expressing ATP sensitive K (KATP) channel comprised of sulfonylurea receptor SUR1 and inwardly rectifying K channel subunit Kir6.2, and the other expressing renal KATP channel ROMK2. At concentrations of 0.3∼10% (vol/vol) DMSO inhibited whole cell Kir6.2/SUR1 currents elicited by bath application of sodium azide (3 mM) in a concentration-dependent manner. The inhibition constant and Hill coefficient... -
The Alteration of Ca2+-activated K+ Channels in Coronary Arterial Smooth Muscle Cells Isolated from Isoproterenol-induced Cardiac Hypertrophy in Rabbit
NariKim, JinHan, EuiyongKim 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 10 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2001, Vol.5 No.2 5 147-156 (10 pages)
are as follows: (1) the unitary current amplitudes and the slope conductance of coronary KCa channels were decreased without changes of the channel kinetics in isoproterenol-induced cardiac hypertrophy; (2) the sensitivity of coronary KCa channels to the changes of intracellular concentration of Ca2 was reduced in isoproterenol-induced cardiac hypertrophy. From above results, we suggest for the first time that the alteration of KCa channels are involved in impaired coronary reserve in... -
Modulation of L-type Ca2+ Channel Currents by Various Protein Kinase Activators and Inhibitors in Rat Clonal Pituitary GH3 Cell Line
YoungMinBae, Hye-JungBaek, HanaCho, YungEEarm, Won-KyungHo 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 8 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2001, Vol.5 No.2 4 139-146 (8 pages)
a protein tyrosine phosphatase (PTP) inhibitor, increased the Ba2 current through the L-type Ca2 channels. In contrast, bisindolylmaleimide I (BIM I), a PKC inhibitor, and genistein, a protein tyrosine kinase (PTK) inhibitor, suppressed the Ba2 currents. Forskolin, an adenylate cyclase activator, and isobutyl methylxanthine (IBMX), a non-specific phosphodiesterase inhibitor, reduced Ba2 currents. The above results show that the L-type Ca2 channels are activated... -
Role of NF-κB Binding Sites in the Regulation of Inducible Nitric Oxide Synthase by Tyrosine Kinase
YoungSueRyu, JangHeeHong, JongHoLim, SoHyunBae, IhnSubAhn, JeongHoSeok, JaeHeunLee, GangMinHur 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 9 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2001, Vol.5 No.1 8 55-63 (9 pages)
In macrophages, lipopolysaccharide (LPS) alone or in combination with interferon-γ (IFN-γ) has been shown to release a nitric oxide (NO) through the increase of the transcription of the inducible nitric oxide synthase (iNOS) gene. To investigate the exact intracellular signaling pathway of the regulation of iNOS gene transcription by LPS plus IFN-γ, the effects of protein tyrosine kinase (PTK) inhibitor and protein kinase C (PKC) inhibitors on NO production, iNOS mRNA expression, nuclear... -
Role of Gap Junctions in the Endothelium-Dependent Hyperpolarization of Vascular Smooth Muscle Cells
YoshimichiYamamoto, MeganF.Klemm, HikaruHashitani, RichardJ.Lang, TsuyoshiSoji, HikaruSuzuki 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 8 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2001, Vol.5 No.1 1 1-8 (8 pages)
Hyperpolarization of arterial smooth muscle by acetylcholine is considered to be produced by the release of an unidentified chemical substance, an endothelium-derived hyperpolarizing factor (EDHF). Several chemicals have been proposed as the candidate for EDHF. However, none of them fulfil completely the nature and property of EDHF. Ultrastructural observation with electron microscope reveals that in some arteries, gap junctions are formed between endothelial and smooth muscle cells. In small... -
The Effect of Carbon Monoxide on Contraction, Cytosolic Ca2+ Level and Ionic Currents in Guinea Pig Ileal Smooth Muscle
SeongChunKwon, SeungSooChung, YunSukKim, TaickSangNam 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 7 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2000, Vol.4 No.6 6 471-477 (7 pages)
The aim of this study was to clarify the mechanism of the inhibitory action of carbon monoxide (CO) on contraction, by measuring cytosolic Ca2 level ([Ca2]i) and ionic currents in guinea-pig ileum. CO (10%) inhibited 40 mM KCl-induced contraction and this effect was blocked by ODQ (1μM), a soluble guanylyl cyclase (sGC) inhibitor. CO inhibited the 40 mM KCl-induced contraction without changing [Ca2]i. Cumulative addition of KCl induced a graded increase in [Ca2]i... -
Relaxant Effect of 4-Aminopyridine on the Mesenteric Artery of Rat
Se-HoonKimTae-ImLee 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 7 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2000, Vol.4 No.6 4 455-461 (7 pages)
It has been well known that 4-aminopyridine (4-AP) has an excitatory effect on vascular smooth muscle due to causing membrane depolarization by blocking K-channel. However, we observed that 4-AP had an inhibitory effect on the mesenteric artery of rat. Therefore, we investigated the mechanism of 4-AP-induced vasorelaxation. The mesenteric arcuate artery and its branches were isolated and cut into ring. The ring segment was immersed in HEPES-buffered solution and its isometric tension was...
