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Mechanical Hyperalgesia Induced by Blocking Calcium-activated Potassium Channels on Capsaicin-sensitive Afferent Fiber
KyungHeeLee, HongKeeShin 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 5 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2007, Vol.11 No.5 8 215-219 (5 pages)
Small and large conductance Ca2+-activated K+ (SKCa and BKCa) channels are implicated in the modulation of neuronal excitability. We investigated how changes in peripheral KCa channel activity affect mechanical sensitivity as well as the afferent fiber type responsible for KCa channel-induced mechanical sensitivity. Blockade of SKCa and BKCa channels induced a sustained decrease of mechanical threshold which was significantly attenuated by topical application of capsaicin onto afferent fiber and... -
Role of Gap Junction in the Regulation of Renin Release and Intracellular Calcium in As 4.1 Cell Line
JeongHeeHan, Bing-ZheHong, YoungGeunKwak, KuichangYuan, WooHyunPark, SungZooKim, SuhnHeeKim 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 6 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2007, Vol.11 No.3 5 107-112 (6 pages)
Gap junction protein, connexin, is expressed in endothelial cells of vessels, glomerulus, and renin secreting cells of the kidney. The purpose of this study was to investigate the role of gap junction in renin secretion and its underlying mechanisms using As 4.1 cell line, a renin-expressing clonal cell line. Renin release was increased proportionately to incubation time. The specific gap junction inhibitor, 18-beta glycyrrhetinic acid (GA) increased renin release in dose-dependent and time-... -
Calcium Ions are Involved in Modulation of Melittin-induced Nociception in Rat: II. Effect of Calcium Chelator
HongKeeShin, KyungHeeLee, ChulHyunCho 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 6 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2006, Vol.10 No.6 1 297-302 (6 pages)
which are characteristics similar to those induced by whole bee venom. Melittin-induced nociception has been known to be modulated by the changes in the activity of excitatory amino acid receptors, voltage-dependent calcium channels, cyclooxygenase and serotonin receptors. The present study was undertaken to investigate the role of calcium chelators (TMB-8 & Quin 2) in melittin-induced nociceptive responses. Changes of mechanical threshold and spontaneous flinching behaviors were measured at... -
Calcium Ions are Involved in Modulation of Melittin-induced Nociception in Rat: I. Effect of Voltage-gated Calcium Channel Antagonist
HongKeeShin, KyungHeeLee 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 8 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2006, Vol.10 No.5 6 255-262 (8 pages)
30 mg], N-type calcium channel blocker, ω-conotoxin GVIA (i.t., 0.1 or 0.5μg; i.pl., 5μg) and P-type calcium channel antagonist, ω- agatoxin IVA (i.t., 0.5μg; i.pl., 5μg) were administered 20 min before or 60 min after i.pl. injection of melittin. Intraplantar pre-treatment and i.t. pre- or post-treatment of verapamil and ω-conotoxin GVIA dose-dependently attenuated the reduction of mechanical threshold, and melittin-induced flinchings were inhibited by i.pl. or i.t. pre-treatment of both... -
Differential Functional Expression of Clotrimazole-sensitive Ca2+-activated K+ Current in Bal-17 and WEHI-231 Murine B Lymphocytes
HaifengZheng, JaeHongKo, JooHyunNam, YungEEarm, SungJoonKim 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 6 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2006, Vol.10 No.1 4 19-24 (6 pages)
pipette solution revealed a voltage-independent K current that was blocked by clotrimazole (1 mM), an SK4 blocker. The expression of mRNAs for SK4 was confirmed in both Bal-17 and WEHI-231 cells. The density of clotrimazole-sensitive SK4 current was significantly larger in Bal-17 than WEHI-231 cells (11.4⁑3.1 Vs. 5.7⁑1.15 pA/pF). Also, the chronic stimulation of B cell receptors (BCR) by BCR-ligation (anti-IgM Ab, 3μg/ml, 8∼12 h) significantly upregulated the... -
Calcium Ion Dynamics after Dexamethasone Treatment in Organotypic Cultured Hippocampal Slice
Hee-JungChae, Tong-HoKang, Ji-HoPark 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 8 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2005, Vol.9 No.6 8 363-370 (8 pages)
slice was treated with a glutamate receptor antagonist together with dexamethasone, the real time Ca2 dynamics were decreased. Furthermore, we confirmed by PI uptake study that glutamate receptor antagonist reduced the hippocampal tissue damage caused by dexamethasone treatment. Therefore, our new calcium ion dynamics system in organotypic cultured hippocampal slice after dexamethasone treatment could provide real time analysis method for investigation of brain injuries by stress. -
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... -
Nitric Oxide Synthase Mediates Carbon Monoxide-Induced Stimulation of L-type Calcium Currents in Human Jejunal Smooth Muscle Cells
InjaLim, JihyunYun, SeungtaeKim, SoonchulMyung, TaehoKim, HyoweonBang 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 6 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2004, Vol.8 No.3 7 161-166 (6 pages)
Exogenous carbon monoxide (0.2%) increases L-type calcium (Ca2) current in human jejunal circular smooth muscle cells. The stimulatory effect of carbon monoxide (CO) on L-type Ca2 current is inhibited by pre-application of L-NNA, a classical competitive inhibitor of nitric oxide synthase (NOS) with no significant isoform selectivity (Lim, 2003). In the present study, we investigated which isoform of NOS affected CO induced stimulation of L-type Ca2 current in human jejunal... -
Heterogeneity of the SR-dependent Inward Na+-Ca2+ Exchange Current in the Heavily Ca2+-buffered Rat Ventricular Myocytes
Kyung-BongYoon, Sung-WanAhn, ChangMannKo 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 10 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2004, Vol.8 No.2 6 101-110 (10 pages)
into a huge inward current of 12.9⁑0.5 pA/pF. From the inward current, two different inward INCXs were identified. One was 10 μM ryanodine-sensitive, constituting 14.2⁑2.3%. It was completely blocked by CdCl2 (0.1 mM and 0.5 mM) and by Na-depletion. The other was identified by 5 mM NiCl2 after suppression of ICaL and ryanodine receptor, constituting 14.8⁑1.6%. This latter was blocked by either 10 mM caffeine-induced SR Ca2-depletion or 1 mM tetracaine.... -
Efffects of Fluoxetine on ATP-induced Calcium Signaling in PC12 Cells
Yeo-MinLee, HeeJungKim, SunHwaHong, Myung-JunKim, DoSikMin, Duck-Joo 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 7 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2004, Vol.8 No.1 9 57-63 (7 pages)
a widely used anti-depressant compound, has several additional effects, including blockade of voltage-gated ion channels. We examined whether fluoxetine affects ATP-induced calcium signaling in PC12 cells by using fura-2-based digital calcium imaging and assay for [3H]-inositol phosphates (IPs). Treatment with ATP (100μM) for 2 min induced [Ca2]i increases. The ATP-induced [Ca2]i increases were significantly decreased by removal of extracellular Ca2 and treatment with the...
