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N-Type Calcium Channels
KeithS.Elmslie 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 6 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2000, Vol.4 No.6 12 525-530 (6 pages)
The early studies of cardiac and smooth muscle cells provided evidence for two different calcium channels, the L-type (also called high-voltage activated [HVA]) and the T-type (low-voltage activated [LVA]). These calcium channels provided calcium for muscle contractions and pace-making activities. As might be expected, the number of different calcium channels increased when researchers studied neurons and the identification of the neuronal calcium channel has proven to be much more difficult... -
The Effect of NO Donor on Contraction, Cytosolic Ca2+ Level and Ionic Currents in Guinea-pig Ileal Smooth Muscle
Seong-ChunKwon, Ki-YoungPark, Duck-SunAhn, Young-HoLee, Bok-SoonKang 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 8 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2000, Vol.4 No.1 5 33-40 (8 pages)
the histamine-stimulated increases in muscle tension in parallel with decreased [Ca2]i. Using the patch clamp technique with a holding potential of 60 mV, SIN-1 (10μM) decreased peak Ba currents (IBa) by 30.9⁑5.4% (n=6) when voltage was stepped from 60 mV to 10 mV and this effect was blocked by ODQ (1μM), a soluble guanylyl cyclase inhibitor. Cu/Zn SOD (100 U/ml), the free radical scavenger, had little effect on basal IBa, and SIN-1 (10μM) inhibited peak IBa... -
Effect of Propofol, an Intravenous Anesthetic Agent, on KATP Channels of Pancreatic β-cells in Rats
EunJeePark, Dae-KyuSong, JaeKyuCheun, JungInBae, Won-KyungHo, YungEEarm 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 7 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2000, Vol.4 No.1 4 25-31 (7 pages)
ATP-sensitive potassium channels (KATP channels) play an important role in insulin secretion from pancreatic beta cells. We have investigated the effect of propofol on KATP channels in cultured single pancreatic beta cells of rats. Channel activity was recorded from membrane patches using the patch-clamp technique. In the inside-out configuration bath-applied propofol inhibited the KATP channel activities in a dose-dependent manner. The half-maximal inhibition dose (ED50) was 48.6⁑8.4μM... -
Effect of Capsaicin on Delayed Rectifier K+ Current in Adult Rat Dorsal Root Ganglion Neurons
JunghyunHahn, SungkwonChung, HyoweonBang 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 6 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2000, Vol.4 No.1 2 9-14 (6 pages)
of the action potential, its firing threshold and the resting membrane potential. In this study, whole cell configuration of patch clamp technique had been applied to record the blocking effect of capsaicin, a lipophilic alkaloid, on the delayed rectifier K current in cultured small diameter DRG neurons of adult rat. Capsaicin reduced the amplitude of K current in dose dependent manner, and the concentration-dependence curve was well described by the Hill equation with KD value of... -
Properties of Spontaneous Activity in Gastric Smooth Muscle
H.Suzuki, Y.Yamamoto, G.D.S.Hirst 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 7 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 1999, Vol.3 No.2 1 119-125 (7 pages)
Mammalian gastric smooth muscles generate spontaneous rhythmic contractions which are associated with slow oscillatory potentials (slow waves) and spike potentials. Spike potentials are blocked by organic Ca2-antagonists, indicating that these result from the activation of L-type Ca2-channel. However, the cellular mechanisms underlying the generation of slow wave remain unclear. Slow waves are insensitive to Ca2-antagonists but are blocked by metabolic inhibitors or low... -
The Effects of Intracellular Monocarboxylates on the ATP-sensitive Potassium Channels in Rabbit Ventricular Myocytes
NariKim, JinHan, Eui-YongKim, Won-KyungHo, YungE.Earm 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 9 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 1998, Vol.2 No.5 6 581-589 (9 pages)
A regulating mechanism of the ATP-sensitive potassium channels (KATP channels) is yet to fully explained. This study was carried out to investigate the effects of intracellular application of monocarboxylates (acetate, formate, lactate, and pyruvate) on KATP channels in isolated rabbit ventricular myocytes. Single channel currents of KATP channels were recorded using the excised inside-out or permeabilized attached (open-cell) patch-clamp technique at room temperature. Intracellular application... -
External pH Effects on Delayed Rectifier K+ Currents of Small Dorsal Root Ganglion Neuron of Rat
YoungHoKim, JungHyunHahn, InJaLim, SungkwonChung, HyoWeonBang 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 8 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 1998, Vol.2 No.2 4 165-172 (8 pages)
outward K+ currents. This outward K+ current was activated around 60 mV by step depolarizing pulses from holding potential 70 mV. Outward K+ currents were decreased by low external pH. Activation and steady-state inactivation curve were shifted to the right by acidification, while there was small change by alkalization. These results suggest that H+ could be alter the sensory modality by changing and modifying voltage-dependent K+ currents, which participated in repolarization. -
Capsaicin에 의한 척수 수준에서의 급성 진통효과와 Norepinephrine의 변화
박형섭(Hyoung-sup Park), 박경표(Kyung-Pyo Park) 대한약리학회 대한약리학잡지 10 Pages
대한약리학회 대한약리학잡지 1993, 제 29권 제 1호 4 33-42 (10 pages)
Capsaicin의 중추신경계에 대한 진통효과를 척수 수준에서 규명하고, 이에 대한 norepinephrine (NE)계의 역할을 규명하기 위하여 tail flick reflex (TFR) latency time의 증가와 척수 내 NE 양의 변화를 측정하였다. 웅성의 Sprague-Dawley 백서를 pentobarbital sodium으로 마취를 하여 femoral vein cannulation과 intrathecal catheterization을 하였고, 이를 통하여 시험약제를 투여하였다. TFR은 capsaicin 또는 용매 투여전, 투여후 10분, 30분, 60분, 때로는 2시간에 측정하였다. MK-801은 capsaicin 투여전 20분에 femoral... -
적출 가토 심장에 있어서 수축빈도-수축력 상관관계에 대한 Higenamine의 강심 효과
장기철(Ki Churl Chang) 대한약리학회 대한약리학잡지 8 Pages
대한약리학회 대한약리학잡지 1983, 제 19권 제 2호 2 9-16 (8 pages)
현재 사용되고 있는 강심제로는 디지탈리스 배당체가 유일한 약물이지란 그 안전역이 대단히 좁아서 보다 안전한 강심제의 개발이 요구되고 있다. 최근 강심작용이 현저할 뿐 아니라 안전역이 비교적 넓을 것으로 인정되는 higenamine이 개발되어 그 작용기전을 밝히려는 시도가 많이 있었다. 본 연구에서는 higenamine의 강심작용 기전을 규명하기 위한 연구의 일환으로 수축빈도-수축력 상관관계(interval-strength relationship)에 있어서 1) Rested-state수축력 2) Positive inotropic effect of activation(PIEA) 3) Negative...
