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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)
We developed a cardiac cell model to explain the phenomenon of mechano-electric feedback (MEF), based on the experimental data with rat atrial myocytes. It incorporated the activity of ion channels, pumps, exchangers, and changes of intracellular ion concentration. Changes 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).... -
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)
Mechanical stimuli to the cardiac myocytes initiate many biochemical and physiological events. Stretch-activated cation channels have been suggested to mediate these events. In this study, cell-attached and inside-out excised-patch clamp methods were used to identify stretch-activated cation channels in adult rat atrial myocytes. Channel openings were increased in cell-attached configuration when negative pressure was applied to the pipette, and also in inside-out excised patches by negative... -
The Substates with Mutants That Negatively Charged Aspartate in Position 172 Was Replaced with Positive Charge in Murine Inward Rectifier Potassium Channel (Murine Kir2.1)
ISo, I.Ashmole, P.R.Stanfield 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 7 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2003, Vol.7 No.5 4 267-273 (7 pages)
recorded with all mutants D172H, D172K and D172R. The unitary current-voltage (I-V) relation was not linear with D172H at pHi 6.3, whereas the unitary I-V relation was linear at pHi 8.0. The relative occupancy at SLC was increased from 0.018 at pHi 8.0 to 0.45 at pHi 5.5. In H-N dimer, that was increased from 0.016 at pHi 8.0 to 0.23 at pHi 5.5. The larger the size of the side chain or pKa with mutants (D172H, D172K and D172R), the more frequent the transitions between the fully open state and... -
Antagonists of NMDA Receptor, Calcium Channel and Protein Kinase C Potentiate Inhibitory Action of Morphine on Responses of Rat Dorsal Horn Neuron
HongKeeShin, YeonSukKim, JongHunJun, SeoEunLee, JaeHwaKim 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 4 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2003, Vol.7 No.5 1 251-254 (4 pages)
The present study was designed to examine whether the co-application of morphine with Ca2 channel antagonist (Mn2, verapamil), N-methyl-D-aspartate (NMDA) receptor antagonist (2-amino-5-phosphonopentanoic acid[AP5], Mg2) or protein kinase C inhibitor (H-7) causes the potentiation of morphine- induced antinociceptive action by using an in vivo electrophysiological technique. A single iontophoretic application of morphine or an antagonist alone induced weak inhibition of wide... -
Roles of Nitric Oxide in Vestibular Compensation
Han-SeongJeong, JaeYeoulJun, Jong-SeongPark 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 5 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2003, Vol.7 No.2 4 73-77 (5 pages)
The effects of nitric oxide on the vestibular function recovery following unilateral labyrinthectomy (UL) were studied. Sprague-Dawley male rats, treated with nitric oxide liberating agent sodium nitroprusside (SNP) and NOS inhibitor NG-nitro-L-arginine methyl ester (L-NAME), were subjected to destruction of the unilateral vestibular apparatus, and then spontaneous nystagmus was observed in the rat. To explore the effects of nitric oxide on the neuronal excitability, whole cell patch clamp... -
Inhibitory and Excitatory Postsynaptic Currents of Medial Vestibular Nucleus Neurons of Rats
SangWooChun, JeongHeeChoi, ByungRimPark 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 5 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2003, Vol.7 No.2 2 59-63 (5 pages)
The medial vestibular nucleus (MVN) neurons are controlled by excitatory synaptic transmission from the vestibular afferent and commissural projections, and by inhibitory transmission from interneurons. Spontaneous synaptic currents of MVN neurons were studied using whole cell patch clamp recording in slices prepared from 13- to 17-day-old rats. The spontaneous inhibitory postsynaptic currents (sIPSCs) were significantly reduced by the GABAA antagonist bicuculline (20μM), but were not affected... -
Involvement of NMDA Receptor and L-type Calcium Channel in the Excitatory Action of Morphine
BonSeopKoo, HongKeeShin, SukHanKang, JongHunJun 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 6 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2002, Vol.6 No.5 2 241-246 (6 pages)
low threshold cells. Morphine-induced excitatory effect at low ejection current was naloxone-reversible and reversed to an inhibitory action at high ejection current. NMDA receptor, calcium channel and intracellular Ca2 antagonists strongly antagonized the morphine-induced excitatory effect. These results suggest that changes in intracellular ionic concentration, especially Ca2, play an important role in the induction of excitatory effect of morphine in the rat dorsal horn neurons. -
Noradrenergic Modulation of Spontaneous Inhibitory Postsynaptic Currents in the Hypothalamic Paraventricular Nucleus
LongHwaLee, WoneeChong, KihoLee, JinBongPark, PanDongRyu 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 10 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2002, Vol.6 No.2 2 71-80 (10 pages)
Previous studies have suggested that brain stem noradrenergic inputs differentially modulate neurons in the paraventricular nucleus (PVN). Here, we compared the effects of norepinephrine (NE) on spontaneous GABAergic inhibitory postsynaptic currents (sIPSCs) in identified PVN neurons using slice patch technique. In 17 of 18 type I neurons, NE (30∼100μM) reversibly decreased sIPSC frequency to 41⁑7% of the baseline value (4.4⁑0.8 Hz, p＜0.001). This effect was blocked by yohimbine... -
Nimodipine as a Potential Pharmacological Tool for Characterizing R-Type Calcium Currents
SeogBaeOh 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 9 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2001, Vol.5 No.6 8 511-519 (9 pages)
Ca currents, blocked high-voltage-activated calcium channel currents by ∼38%. Interestingly, high concentrations of nimodipine (＞10μM) further reduced the "residual" currents in DRG neurons from α1E knock-out mice, after blocking L-, N- and P/Q-type Ca currents with 10μM nimodipine, 1μM ω-conotoxin GVIA and 200 nM ω-agatoxin IVA, indicating inhibitory effects of nimodipine on R-type Ca currents. Nimodipine (＞10μM) also produced the inhibition of both low-voltage-activated... -
N-Type Calcium Channels
KeithS.Elmslie 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 6 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2000, Vol.4 No.6 12 525-530 (6 pages)
The early studies of cardiac and smooth muscle cells provided evidence for two different calcium channels, the L-type (also called high-voltage activated [HVA]) and the T-type (low-voltage activated [LVA]). These calcium channels provided calcium for muscle contractions and pace-making activities. As might be expected, the number of different calcium channels increased when researchers studied neurons and the identification of the neuronal calcium channel has proven to be much more difficult...
