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Voltage-Dependent Ionic Currents and Their Regulation by GTP and Phorbol Ester in the Unfertilized Eggs of Mouse and Hamster
Kim, Ik-Hyun, Kim, Yang-Mi, Haan, Jae-Hee, Park, Choon-Ok, Hong, Seong-Geun 대한생리학회 대한생리학회지 14 Pages
대한생리학회 대한생리학회지 1993, 제 27권 제 1호 9 93-106 (14 pages)
nor decreased outward iK was observed on blocking the channels by replacing Ca 2+ with Co2+ (Fig. 2C). These data imply that the activation of Ca2+ channels is a prerequisite to conduction of iK, Interestingly, a considerable amount of outward current in mouse eggs re- mained even in the presence of CsCl (Fig. 3) and they reversed around -20 mV (Fig. 8B), which is... The present study was performed to investigate the properties of ionic currents elicited by voltage pulses in the unfertilized eggs of mouse and hamster by using the whole cell voltage clamp techniques and to find out if there are any differences in properties between eggs of the two rodents. In addition, the modulatory effect of G proteins and protein kinase C (PKC) on the ionic channels were observed. The inward current in hamster eggs was shown to be due to Ca2+ current (ica)). The current... -
pH-dependent modulation of intracellular free magnesium ions with ion- selective electrodes in papillary muscle of guinea pig
Shang-Jin Kim, In-Gook Cho, Hyung-Sub Kang, Jin-Shang Kim 대한수의학회 Journal of Veterinary Science 6 Pages
대한수의학회 Journal of Veterinary Science 2006, 제 7권 제 1호 5 31-36 (6 pages)
WR. Intracellular alkalinization causes Mg 2+ release from intracellular binding sites in leech Retzius neurons. Pflugers Arch 1997, 435, 65-73. 12.Hall SK, Fry CH. Magnesium affects excitation, conduction, and contraction of isolated mammalian cardiac muscle. Am J Physiol 1992, 263, H622-H633. 13.Harrison SM, Frampton JE, McCall E, Boyett MR, Orchard CH. Contraction and intracellular Ca 2+, Na +... A change in pH can alter the intracellular concentration of electrolytes such as intracellular Ca2+ and Na+ ([Na+]i) that are important for the cardiac function.For the determination of the role of pH in the cardiac magnesium homeostasis, the intracellular Mg 2+ concentration ([Mg 2+]i), membrane potential and contraction in the papillary muscle of guinea pigs using ion-selective electrodes changing extracellular pH ([pH]o)or intracellular pH ([pH ]i )were measured in this study. A high... -
Spatial reproducibility of complex fractionated atrial electrogram depending on the direction and configuration of bipolar electrodes: an in-silico modeling study
Jun-SeopSong, Young-SeonLee, MinkiHwang, Jung-KeeLee, ChangyongLi, BoyoungJoung, Moon-HyoungLee, EunBoShim, Hui-NamPak 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 8 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2016, Vol.20 No.5 8 507-514 (8 pages)
[13]. The LA geometry (triangular mesh with 400,000 nodes) was constructed from computed tomography data by using the NavX system. (St. Jude Medical Inc., Minnetonka, MN, USA). Cellular ionic currents were calculated using the Courtemanche et al. human atrial myocyte model [14], and electrical wave conduction in tissue was modeled by the following partial differential equation [15]: where V... Although 3D-complex fractionated atrial electrogram (CFAE) mapping is useful in radiofrequency catheter ablation for persistent atrial fibrillation (AF), the directions and configuration of the bipolar electrodes may affect the electrogram. This study aimed to compare the spatial reproducibility of CFAE by changing the catheter orientations and electrode distance in an in -silico left atrium (LA). We conducted this study by importing the heart CT image of a patient with AF into a 3D-homogeneous... -
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)
on the myocardium and specialized conduction tissue at clinically relevant doses that dilate vascular smooth muscle in vivo. Owing to the relative selectivity of CCBs on vascular smooth muscle, significant depressant effects on myocardial contractility and atrioventricular conduction could be avoided [39]. However, the tissue-dependent selectivity can be lost in overdose situations [40]. In... Dihydropyridine (DHP) calcium channel blockers (CCBs) have been widely used to treat of several cardiovascular diseases. An excessive shortening of action potential duration (APD) due to the reduction of Ca2+ channel current (ICa) might increase the risk of arrhythmia. In this study we investigated the electrophysiologicaleffects of nicardipine (NIC), isradipine (ISR), and amlodipine (AML) on the cardiac APD in rabbit Purkinje fibers, voltage-gated K+ channel currents (IKr, IKs) and... -
Electrophysiological and Mechanical Characteristics in Human Ileal Motility: Recordings of Slow Waves Conductions and Contractions, In vitro
Seung-BumRyoo, Heung-KwonOh, SangHuiMoon, EunKyungChoe, SungAYu, Sung-HyePark, KyuJooPark 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 10 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2015, Vol.19 No.6 8 533-542 (10 pages)
and con- tractions in the smooth muscle of the human small intes- tine [9-13], the mechanisms of electric or contractile activ- ities remain unknown. More complex mechanism should be involved in conduction of th e slow wave from the ICC to the smooth muscle in human, wh ich might be different from ..PAGE:2 534 SB Ryoo, et al Fig. 1. Electrophysiological recor- dings of the circular muscle of... Little human tissue data are available for slow waves and migrating motor complexes, which are the main components of small bowel motility. We investigated the electrophysiological and mechanical characteristics of human ileal motility, in vitro. Ileum was obtained from patients undergoing bowel resection. Electrophysiological microelectrode recordings for membrane potential changes and mechanical tension recordings for contraction from smooth muscle strips and ileal segments were performed.... -
Characteristics of Diprophylline-Induced Bidirectional Modulation on Rat Jejunal Contractility
Fang-FeiLiu, Da-PengChen, Yong-JianXiong, Bo-ChaoLv, YuanLin 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 7 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2014, Vol.18 No.1 6 47-53 (7 pages)
is a blocker of neuronal conduction [20,21], diprophylline only exerted stimulatory effects on jejunal contractility in normal contractile state, RLCS, and RHCS, suggesting that diprophylline-induced BM requires the presence of enteric nervous system. In a Ca 2+ -free assay condition or in the presence of vera- pamil, which is a Ca 2+ channel blocker [22], diprophylline did not exert further... In this study, we propose that diprophylline exerts bidirectional modulation (BM) on the isolated rat jejunal segment depending on its contractile state. The results supported the hypothesis. Dipro-phylline (20 μM) exerted stimulatory effects on the contractility of jejunal segment in six low contractile states while inhibitory effects in six high contractile states, showing the characteristics of BM. Diprophylline-induced stimulatory effect was significantly blocked by atropine, indicating the... -
The Pathophysiologic Roles of TRPM7 Channel
HyunSooPark, ChansikHong, ByungJooKim, InsukSo 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 9 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2014, Vol.18 No.1 2 15-23 (9 pages)
X, Gibson W, Bates-Withers C, Van den Boogert M, Chaudhuri D, Pu WT, Mangoni ME, Clapham DE. Timing of myocardial trpm7 deletion during cardiogenesis variably disrupts adult ventricular function, conduction, and repolarization. Circulation. 2013;128:101-114. 58. Sah R, Mesirca P, Van den Boogert M, Rosen J, Mably J, Mangoni ME, Clapham DE. Ion channel-kinase TRPM7 is required for maintaining... Transient receptor potential melastatin 7 (TRPM7) is a member of the melastatin-related subfamily and contains a channel and a kinase domain. TRPM7 is known to be associated with cell proliferation, survival, and development. It is ubiquitously expressed, highly permeable to Mg2＋ and Ca2＋, and its channel activity is negatively regulated by free Mg2＋ and Mg-complexed nucleotides. Recent studies have investigated the relationships between TRPM7 and a number of diseases. TRPM7 regulates cell...