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Role of Stretch-Activated Channels in Stretch-Induced Changes of Electrical Activity
JaeBoumYoum, Su-HyunJo, ChaeHunLeem, Won-KyungHo, YungE. 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 9 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2004, Vol.8 No.1 6 33-41 (9 pages)
in membrane excitability and Ca2 transients could then be calculated. In the model, the major ion channels responsible for the stretch-induced changes in electrical activity were the stretch-activated channels (SACs). The relationship between the extent of stretch and activation of SACs was formulated based on the experimental findings. Then, the effects of mechanical stretch on the electrical activity were reproduced. The shape of the action potential (AP) was significantly changed by... -
Stretch-activated K+ Channels in Rat Atrial Myocytes
JaeBoumYoum 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 8 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2003, Vol.7 No.6 8 341-318 (8 pages)
80 and 0 mV and 55⁑6 pS between 0 and 80 mV (n=5). Glibenclamide (100μM) or ATP (2 mM) failed to block the channel openings, indicating that it is not ATP-sensitive K channel. Arachidonic acid (30μM), which has been shown to activate a K channel cooperatively with membrane stretch, did not affect the channel activity. GdCl3 (100μM) also did not alter the activity. These results demonstrate that the mechanical stretch in rat atrial myocytes activates a novel... -
Mechanism of Glutamate-induced [Ca2+]i Increase in Substantia Gelatinosa Neurons of Juvenile Rats
SungJunJung, JeongSookChoi, JiyeonKwak, JunKim, JongWhanKim, SangJeongKim 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 5 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2003, Vol.7 No.2 1 53-57 (5 pages)
The glutamate receptors (GluRs) are key receptors for modulatory synaptic events in the central nervous system. It has been reported that glutamate increases the intracellular Ca2 concentration ([Ca2]i) and induces cytotoxicity. In the present study, we investigated whether the glutamate-induced [Ca2]i increase was associated with the activation of ionotropic (iGluR) and metabotropic GluRs (mGluR) in substantia gelatinosa neurons, using spinal cord slice of juvenile rats... -
Altered Delayed Rectifier K+ Current of Rabbit Coronary Arterial Myocytes in Isoproterenol-Induced Hypertrophy
NariKim, JinHan, EuiyongKim 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 8 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2001, Vol.5 No.1 5 33-40 (8 pages)
normal and hypertrophied hearts. These channels were measured from rabbit coronary smooth muscle cells using a patch clamp technique. The main findings of the study are as follows: (1) the KDR current density was decreased without changes of the channel kinetics in isoproterenol-induced hypertrophy; (2) the sensitivity of coronary KDR channels to 4-AP was increased in isoproterenol-induced hypertrophy. From the above results, we suggest for the first time that the alteration of KDR channels may... -
Glucose/Oxygen Deprivation Induces Release of [3H]5-hydroxytryptamine Associated with Synapsin 1 Expression in Rat Hippocampal Slices
EunMiPark, SangHuiChu, KyungEunLee 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 7 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2000, Vol.4 No.5 2 347-353 (7 pages)
5-HT and the changes of the above proteins were also investigated. GOD for 20 minutes enhanced release of [3H]5-HT, which was in part blocked by the NMDA receptor antagonist, APV. The augmented expression of synapsin 1 during GOD for 20 minutes, which was also in part prevented by APV. In contrast, the expression of syntaxin and SNAP-25 were not altered during GOD. These results suggest that ischemic insult induces release of [3H]5-HT associated with synapsin 1, synaptic vesicular protein, via... -
Decreased Voltage Dependent K+ Currents in Cerebral Arterial Smooth Muscle Cells of One-Kidney, One-Clip Goldblatt Hypertensive Rat
YoungSunOh, SeHoonKim, HoeSukKim, ByeongHwaJeon, SeokJongChang, KwangJinKim 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 9 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 1999, Vol.3 No.5 3 471-479 (9 pages)
in current clamp mode from normotensive rat and 1K,1C-GBH rat were 45.9⁑1.7 and 38.5⁑1.6 mV, respectively. 4-AP (5 mM) caused the resting membrane potential hypopolarize but charybdotoxin (0.1μM) did not cause any change of membrane potential. Component of 4-AP-sensitive Kv current was smaller in 1K,1C-GBH rat than in normotensive rat. The voltage dependence of steady-state activation and inactivation of Kv channel determined by using double-pulse protocol showed no... -
Mechanism of Membrane Hyperpolarization by Extracellular K+ in Resistance-sized Cerebral Arterial Muscle Cell of Rabbit
SeHoonKim, KunMooChoi, HoeSukKim, ByeongHwaJeon, SeokJongChang 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 10 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 1999, Vol.3 No.1 1 1-10 (10 pages)
currents at [K]o of 6 and 15 mM showed that the barium- sensitive outward current increased at 15 mM K. From the above results the following were concluded. Barium-sensitive K channel activity increased when [K]o is elevated and this leads to an increase in K-outward current. Consequently, the membrane potential hyperpolarizes, leading to the relaxation of resistant arteries, and this is thought to contribute to an increase in the local blood flow of brain. -
Increased Activity of Large Conductance Ca2+-Activated K+ Channels in Negatively-Charged Lipid Membranes
JinBongParkPanDongRyu 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 11 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 1998, Vol.2 No.4 15 529-539 (11 pages)
and the differences were more pronounced at the lower ionic strength. The average slope conductances at 100 mM KCl were 251⁑9.9, 360⁑8.7 and 356⁑12.4 (mean⁑SEM) pS in PE, PS and PI membranes respectively. The potentials at which Po was 1/2, appeared to have shifted left by 40 mV along voltage axis in the membranes formed with PS or PI. Such shift was consistently seen at pCa 5, 4.5, 4 and 3.5. Estimation of the effect of surface charge from these data indicated that maxi... -
Inhibitory Effect of Caffeine on Carbachol-Induced Nonselective Cationic Current in Guinea-Pig Gastric Myocytes
SungJoonKim, KyungWanMin, YoungChulKim, SangJinLee, InsukSo, KiWhanKim 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 7 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 1998, Vol.2 No.3 10 353-359 (7 pages)
Ca2 release by heparin had no significant effects on the activation of ICCh. When the same cationic current had been induced by intracellular dialysis of GTP[γS] in order to bypass the muscarinic receptor, the inhibitory effect of caffeine was significantly attenuated. The results of this study indicate that both intracellular signalling pathways for ICCh, proximal and distal to G-protein activation, are suppressed by caffeine. A major inhibition was observed at the proximal level. -
뇌혈류 자가조절에 대한 Endothelium-derived Relaxing Factor의 역할
홍기환(Ki Whan Hong), 유성숙(Sung Suk Yu), 임병용(Byung Yong Rhim) 대한약리학회 대한약리학잡지 12 Pages
대한약리학회 대한약리학잡지 1995, 제 31권 제 1호 4 27-38 (12 pages)
본 연구에서는 콜린성 기전에 반응하여 분비되는 내피 의존성 이완물질(endothelium-derived relaxing factor, EDRF)나 nitric oxide(NO)가 마취 흰쥐의 뇌혈류 자가조절기전에 관여할 가능성을 관찰하였다. Acetylcholine(10-9-10-6M)을 포함한 mock 뇌척수액(CSF)을 관류시 뇌연막 동맥은 농도에 의존하여 이완반응 나타내었고(평균; 19.3 ± 1.7μm, n=36), 이러한 이완반응은 N{\omega}-nitro-L-arginine(L-NNA, 10-5M)에 의해서 억제되었을 뿐 아니라 methylene blue(10-6M)나 oxyhemoglobin(10-6M)에 의하여도 억제되었다. 한편...
