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Comparison of electrophysiological effects of calcium channel blockers on cardiac repolarization
Hyang-AeLee, Sung-AeHyun, Sung-GurlPark, Ki-SukKim, SungJoonKim 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 9 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2016, Vol.20 No.1 15 119-127 (9 pages)
and amlodipine (AML) on the cardiac APD in rabbit Purkinje fibers, voltage-gated K+ channel currents (IKr, IKs) and voltage-gated Na+ channel current (INa). The concentration-dependent inhibition of Ca2+ channel currents (ICa) was examined in rat cardiomyocytes; these CCBs have similar potency on ICa channel blocking with IC50 (the half-maximum inhibiting concentration) values of 0.142, 0.229, and 0.227 nM on NIC, ISR, and AML, respectively. However, ISR shortened both APD50 and APD90 already at... -
Effects of Calcium Channel Blockers on Porcine Cardiac and Coronary Arterial Function in Ischemia-Reperfusion
YungHongBaik, HyunKook, SunHeePark, SeongJooJeong, DongYoonLim 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 9 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 1999, Vol.3 No.6 7 587-595 (9 pages)
This study was designed to investigate effects of calcium antagonists on endothelial and neuronal dysfunction of right coronary artery (RCA) induced by ischemia- reperfusion in anesthetized, open-chest pigs. After reperfusion, pigs were sacrificed and the RCA was rapidly dissected for in vitro experiments. Experimental groups were divided into 4 groups: control (C-RCA), ischemia-reperfusion only (I-RCA), verapamil infusion (VI-RCA) and nifedipine infusion (NI-RCA) group, respectively. The... -
Two Types of Voltage-activated Calcium Currents in Goldfish Horizontal Cells
Sun-SookPaik, Sun-HoBai, Chang-SubJung 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 6 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2005, Vol.9 No.5 3 269-274 (6 pages)
In horizontal cells (HCs) that were freshly dissociated from goldfish retina, two types of voltage- dependent calcium currents (ICa) were recorded using a patch-clamping configuration: a transient type current and a sustained type current. The cell was held at 40 mV, and the prepulse step of 90 mV was applied before command pulse between 65 and 55 mV. The transient Ca2 current was activated by depolarization to around 50 mV from a prepulse voltage of... -
Calcium수송기전에 미치는 Carbachol의 영향
이종화(Jong Hwa Lee) 대한약리학회 대한약리학잡지 10 Pages
대한약리학회 대한약리학잡지 1995, 제 31권 제 3호 10 355-364 (10 pages)
5) PTx (0.2μg/ml) 투여로 carbachol의 hexosaminidase 분비가 의의있게 억제되었다. 위의 결과로 미루어 보아, 이 세포의 muscarinic receptor가 calcium channel을 통한 calcium수송에 매우 중요한 영향을 나타내는데, 이들 calcium ion channel은 적어도 두 종류가 존재하며, 하나는G-protein-dependent calcium channel에 의하며, 다른 하나는 G-protein-independent calcium channel에 대한 작용에 의한 것으로 생각된다. 또한 이 calcium channel들은 2가 또는 3가의 다른 금속 ion들에 의하여 calcium수송이 억제된다. -
흰쥐 적출 방광 배뇨근의 수축성에 대한 Imipramine의 작용과 Calcium동원 기전과의 관계
이종범(Jong Bum Lee), 유계준(Kae Joon Yoo), 하정희(Jeoung Hee Ha), 권오철(Oh Cheol Kwon), 이광윤(Kwang Youn Lee), 김원준(Won Joon Kim) 대한약리학회 대한약리학잡지 10 Pages
대한약리학회 대한약리학잡지 1992, 제 28권 제 1호 9 81-90 (10 pages)
이에 본 실험에서는 흰쥐의 적출방광 배뇨근 절편을 사용하여 imipramine의 항유뇨작용과 calcium동원과의 관련성을 추구하여 다음과 같은 결과를 얻었다. 1. 배뇨근 절편은 전기장자극에 의해 주파수의존적으로 수축하였는데, 이 전기장자극 유발 수축반응은 imipramine에 의해 농도 의존적으로 억제되었고 고농도에서는 완전히 소실되었으나, atropine에 의해서는 고농도에서도 소실되지 않았다. 2. Imipramine은 자발수축 및 기본 장력에 대하여 이들을 농도 의존적인 양상으로 억제하였으며, 이 억제작용은 diltiazem에 의한 억제와... -
돼지 소장 평활근 세포막에서의 Calcium 이동에 미치는 Calcium entry blockers 의 영향
석정호(Jeong-Ho Seok), 임종호(Jong-Ho Lim), 이재흔(Jae-Heun Lee) Jeong-Ho Seok， Jong-Ho Lim and Jae-Heun Lee 대한약리학회 대한약리학잡지 6 Pages
대한약리학회 대한약리학잡지 1986, 제 22권 제 2호 10 151-156 (6 pages)
최근 심근세포 또는 신경세포에서 발표된 여러 종류의 calcium channel중 calcium antagonist로 차단되는 channel 또는 차단되지 않는 channel 등이 있는지 알아보기 위해 실험을 시행하였다. 돼지 소장 평활근으로부터 고농도의 KCl(150mM)로 부하된 세포 포막낭을 만들어 고농도의K+ 또는 전기자극으로 45Ca의 이동을 유발시켜 다음과 같은 성적을 얻었다. 저농도의 K+용액에서의 45Ca이동보다 고농도의 K+-용액에서의 45Ca이동이 유의하게 증가되었으며(p<0. 05) 이때 유입되는 45Ca의 양은 시간에 따라 서서히 감소되었다.... -
Calcium-activated Ionic Currents in Smooth Muscle Cells from Rabbit Superior Mesenteric Artery
Lee, Moo-Yeol, Bang, Hyo-Weon, Uhm, Dae-Yong, Rhee, Sang-Don 대한생리학회 대한생리학회지 8 Pages
대한생리학회 대한생리학회지 1994, 제 28권 제 2호 5 151-158 (8 pages)
muscle cells were isolated from rabbit mesenteric artery. Three kinds of Ca2+-activated current were studied with the patch clamp method. Ca2+-activated K+ current with a large oscillation was recorded in the depolarized potential range. The single channel conductance of this current was about 250 pS. It was abolished by replacing intracellular K+ with Cs+. A Ca2+-activated nonselective cation current was observed in both the depolarized and hyperpolarized potential ranges. And it was blocked by... -
Effects of Lemakalim, a Potassium Channel Opener, on the Contractility and Electrical Activity of the Antral Circular Muscle in Guinea-Pig Stomach
Kim, Sung-Joon, Jun, Jae-Yeoul, Choi, Youn-Baik, Kim, Ki-Whan, Kim, Woo-Gyeum 대한생리학회 대한생리학회지 14 Pages
대한생리학회 대한생리학회지 1994, 제 28권 제 1호 4 37-50 (14 pages)
Synthetic potassium channel openers (KCOs) are agents capable of opening K-channels in excitable cells. These agents are known to have their maximal potency in the smooth muscle tissue, especially in the vascular smooth muscle. Much attention has been focused on the type of K-channel that is responsible for mediating the effects of KCOs. As the KCO-induced changes are antagonized by glibenclamide, an KATP (ATP-sensitive K-channel) blocker in the pancreatic β-cell, KATP was suggested to be the... -
Effect of Cyclic GMP on the Calcium Current in Rabbit Ventricular Myocytes
Han, Jin, Leem, Chae-Hun, Ahn, Chul-Soo, So, In-Suk, Kim, Eui-Yong, Ho, Won-Kyung, Earm, Yung-E 대한생리학회 대한생리학회지 12 Pages
대한생리학회 대한생리학회지 1993, 제 27권 제 2호 4 151-162 (12 pages)
or 100 μM 8-bromo-cyclic GMP, already augmented calcium current was potentiated by intracellular application of 100 μM cyclic AMP or 1 μM isoprenaline or 1 μM forskolin. In the presence of cyclic GMP, acetylcholine reduced the calcium current only when the calcium current was increased by isoprenaline. From the above results it could be concluded that intracellular perfusion with cyclic GMP increases the basal calcium current via a mechanism involving a cyclic GMP-dependent protein kinase. -
Effect of pH on Calcium-Activated Potassium Channels in Pulmonary Arterial Smooth Muscle Cells of the Rabbit
Lee, Suk-Ho, Ho, Won-Kyung, Earm, Yung-E 대한생리학회 대한생리학회지 10 Pages
대한생리학회 대한생리학회지 1991, 제 25권 제 1호 2 17-26 (10 pages)
relationship. During the application of 10 mM tetraethylammonium (TEA) to the intracellular membrane surface, the amplitude of single channel current was reduced and very rapid flickering appeared. The open probability P0 of this channel was increased by increasing positivity of the potential across the patch membrane, with e-fold increase by 20 mV depolarization, and by increasing the internal Ca2+ concentration. These findings are consistent with those of large conductance Ca-activated K...
