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Electrically-evoked Neural Activities of rd1 Mice Retinal Ganglion Cells by Repetitive Pulse Stimulation
SangBaekRyu, JangHeeYe, JongSeungLee, YongSookGoo, ChiHyunKim, KyungHwanKim 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 6 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2009, Vol.13 No.6 6 443-448 (6 pages)
For successful visual perception by visual prosthesis using electrical stimulation, it is essential to develop an effective stimulation strategy based on understanding of retinal ganglion cell (RGC) responses to electrical stimulation. We studied RGC responses to repetitive electrical stimulation pulses to develop a stimulation strategy using stimulation pulse frequency modulation. Retinal patches of photoreceptor-degenerated retinas from rd1 mice were attached to a planar multi-electrode array... -
Diclofenac, a Non-steroidal Anti-inflammatory Drug, Inhibits L-type Ca2＋ Channels in Neonatal Rat Ventricular Cardiomyocytes
OlegV.Yarishkin, EunMiHwang, DonggyuKim, JaeChealYoo, SangSooKang, DeokRyoungKim, Jae-Hee-JungShin, Hye-JooChung, Ho-SangJeong, DawonKang 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 6 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2009, Vol.13 No.6 5 437-442 (6 pages)
three NSAIDs, including naproxen and ibuprofen, significantly reduced inward whole cell currents. At concentrations higher than 3ՌM, diclofenac inhibited reversibly the Na＋ current and did irreversibly the L-type Ca2＋ channels-mediated inward current (IC50=12.89±0.43ՌM) in a dose-dependent manner. However, nifedipine, a well-known L-type channel blocker, effectively inhibited the L-type Ca2＋ currents but not the Na＋ current. Our finding may explain that diclofenac causes the CV... -
The Influences of G Proteins, Ca2＋, and K＋ Channels on Electrical Field Stimulation in Cat Esophageal Smooth Muscle
JunHongPark, HyunSikKim, SunYoungPark, ChaeukIm, JiHoonJeong, InKyeomKim, UyDongSohn 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 8 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2009, Vol.13 No.5 10 393-400 (8 pages)
NO released by myenteric neurons controls the off contraction induced by electrical field stimulation (EFS) in distal esophageal smooth muscle, but in the presence of nitric oxide synthase (NOS) inhibitor, L-NAME, contraction by EFS occurs at the same time. The authors investigated the intracellular signaling pathways related with G protein and ionic channel EFS-induced contraction using cat esophageal muscles. EFS-induced contractions were significantly suppressed by tetrodotoxin (1ՌM)... -
Effects of Losartan on Catecholamine Release in the Isolated Rat Adrenal Gland
Hae-JeongNoh, Yoon-SungKang, Dong-YoonLim 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 9 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2009, Vol.13 No.4 10 327-335 (9 pages)
The aim of this study was to determine whether losartan, an angiotensin II (Ang II) type 1 (AT1) receptor could influence the CA release from the isolated perfused model of the rat adrenal medulla. Losartan (5∼50</SUB>ՌM) perfused into an adrenal vein for 90 min produced dose- and time-dependent inhibition of the CA secretory responses evoked by ACh (5.32 mM), high K＋ (56 mM, a direct membrane depolarizer), DMPP (100ՌM) and McN-A-343 (100ՌM). Losartan failed to affect... -
Provinol Inhibits Catecholamine Secretion from the Rat Adrenal Medulla
Jung-HeeLee, Yu-SeungSeo, Dong-YoonLim 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 11 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2009, Vol.13 No.3 14 229-239 (11 pages)
(a selective neuronal nicotinic NN receptor agonist, 100ՌM) and McN-A-343 (a selective muscarinic M1 receptor agonist, 100ՌM). Provinol itself did not affect basal CA secretion. Also, in the presence of provinol (1Ռg/ml), the secretory responses of CA evoked by Bay-K-8644 (a voltage-dependent L-type dihydropyridine Ca2＋ channel activator, 10ՌM), cyclopiazonic acid (a cytoplasmic Ca2＋-ATPase inhibitor, 10ՌM) and veratridine (an activator of voltage-dependent Na＋... -
Block of hERG K＋ Channel by Classic Histamine H1 Receptor Antagonist Chlorpheniramine
Hee-KyungHong, Su-HyunJo 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 6 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2009, Vol.13 No.3 12 215-220 (6 pages)
current amplitude at the end of the voltage steps and hERG tail currents. The IC50 of chlorpheniramine-dependent hERG block in Xenopus oocytes decreased progressively relative to the degree of depolarization. Chlorpheniramine affected the channels in the activated and inactivated states but not in the closed states. The S6 domain mutations Y652A and F656A partially attenuated (Y652A) or abolished (F656A) the hERG current block. These results suggest that the H1 antihistamine, chlorpheniramine is... -
Diversity of Ion Channels in Human Bone Marrow Mesenchymal Stem Cells from Amyotrophic Lateral Sclerosis Patients
KyoungSunPark, MiRanChoi, KyoungHwaJung, SeungHyunKim, HyunYoungKim, KyungSukKim, Eun-JongCha, YangmiKim, YoungGyuChai 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 6 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2008, Vol.12 No.6 8 337-342 (6 pages)
(ALS) patients, focusing on functional ion channels. All hBM-MSCs contain several MSCs markers with no significant differences, whereas the distribution of functional ion channels was shown to be different between cells. Four types of K＋ currents, including noise-like Ca＋2-activated K＋ current (IKCa), a transient outward K＋ current (Ito), a delayed rectifier K＋ current (IKDR), and an inward-rectifier K＋ current (Kir) were heterogeneously present in these cells, and a TTX-sensitive Na＋... -
Voltage-dependent Ca2＋ Current Identified in Freshly Isolated Interstitial Cells of Cajal (ICC) of Guinea-pig Stomach
YoungChulKim, HikaruSuzuki, Wen-XieXu, HikaruHashitani, WoongChoi, Hyo-YungYun, Seon-MeePark6, SeiJinYoun6, Sang-JeonLee, SangJinLee 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 8 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2008, Vol.12 No.6 6 323-330 (8 pages)
current under K＋-rich pipette solution. The voltage clamp experiments revealed the amplitude of - 329 pA inward current at irregular frequency. With Cs＋-rich pipette solution at Vh=−80 mV, ICC-MY produced voltage-dependent inward currents (VDIC), and nifedipine (1ՌM) blocked VDIC. Therefore, we successfully isolated c-Kit positive single ICC from guinea-pig stomach, and found that ICC-MY potently produced dihydropiridine sensitive L-type voltage-dependent Ca2＋ currents (VDCCL). -
Modeling of Arrhythmogenic Automaticity Induced by Stretch in Rat Atrial Myocytes
JaeBoumYoum, ChaeHunLeem, YinHuaZhang, NariKim, JinHan, YungE.Earm 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 8 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2008, Vol.12 No.5 8 267-274 (8 pages)
Since first discovered in chick skeletal muscles, stretch-activated channels (SACs) have been proposed as a probable mechano-transducer of the mechanical stimulus at the cellular level. Channel properties have been studied in both the single-channel and the whole-cell level. There is growing evidence to indicate that major stretch-induced changes in electrical activity are mediated by activation of these channels. We aimed to investigate the mechanism of stretch-induced automaticity by... -
Effects of Somatostatin on the Responses of Rostrally Projecting Spinal Dorsal Horn Neurons to Noxious Stimuli in Cats
SungJunJung, Su-HyunJo, SanghyuckLee, EunhuiOh, Min-SeokKim, WooDongNam, SeogBaeOh 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 6 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2008, Vol.12 No.5 6 253-258 (6 pages)
Somatostatin (SOM) is a widely distributed peptide in the central nervous system and exerts a variety of hormonal and neural actions. Although SOM is assumed to play an important role in spinal nociceptive processing, its exact function remains unclear. In fact, earlier pharmacological studies have provided results that support either a facilitatory or inhibitory role for SOM in nociception. In the current study, the effects of SOM were investigated using anesthetized cats. Specifically, the...
