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Nitric Oxide (NO) Inhibites the Neuronal Activities in the Rat Nucleus Tractus Solitarius
MiWonKim, MunSungPark, SunYoulRyu, JiYeonJung, YeonJinJeong, Sun 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 9 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2004, Vol.8 No.1 2 7-15 (9 pages)
Nitric oxide (NO) system has been implicated in a wide range of physiological functions in the nervous system. However, the roleof NO in regulating the neural activity in the gustatory zone of nucleus tractus solitarius (NTS) has not been established. The present study was aimed to investigate the role of NO in the gustatory NTS neurons. Sprague-Dawley rats, weighing about 50 g, were used. Whole cell patch recording and immunohistochemistry were done to determine the electrophysiological... -
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 neuronal excitability, whole cell patch clamp technique was applied on isolated medial vestibular nuclear neurons. The frequency of spontaneous nystagmus in SNP treated rats was lesser than that of spontaneous nystagmus in control animals. In contrast, pre-UL treatment with L-NAME resulted in a significant increase in spontaneous nystagmus frequency. In addition, SNP increased the frequency of spontaneous action potential in isolated medial vestibular nuclear neurons. Potassium currents of... -
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... -
Changes in Excitability of Neurons in Rat Medial Vestibular Nucleus Following Vestibular Neurectomy
SangWooChun, JeongHeeChoi, ShinHyungLee, ByungRimPark 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 5 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2002, Vol.6 No.6 2 287-291 (5 pages)
Intrinsic excitabilities of acutely isolated medial vestibular nucleus (MVN) neurons of rats with normal labyrinth and with undergoing vestibular compensation from 30 min to 24 h after unilateral vestibular deafferentation (UVD) were compared. In control rats, proportions of type A and B cells were 30 and 70%, respectively, however, the proportion of type A cells increased following UVD. Bursting discharge and irregular firing patterns were recorded from 2 to 12 h post UVD. The spontaneous... -
The Effect of Carbon Monoxide on Contraction, Cytosolic Ca2+ Level and Ionic Currents in Guinea Pig Ileal Smooth Muscle
SeongChunKwon, SeungSooChung, YunSukKim, TaickSangNam 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 7 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2000, Vol.4 No.6 6 471-477 (7 pages)
of CO, and the [Ca2]i-tension relationship shifted downwards. Using the patch clamp technique with a holding potential of 60 mV, we found that CO had little effect on the peak Ba currents (IBa) when voltage was stepped from 60 mV to 0 mV. In addition, CO showed no effect on the depolarization-activated outward K currents in the all potential ranges. We conclude that CO inhibits smooth muscle contraction mainly by decreasing the Ca2 sensitivity of contractile... -
Stationary Outward and Transient Ca2+-Dependent Currents in Hamster Oocytes
Yang-MiKim, Jae-HeeHan, Jong-SuKim, Seong-GeunHong 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 6 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2000, Vol.4 No.5 9 403-408 (6 pages)
The outward currents elicited in hamster eggs by depolarizing pulses were studied. The currents appeared to comprise at least two components, a transient outward component (Ito) and a steady-state outward component (I∞). Ito was transiently followed by the cessation of inward Ca2 current (ICa), and its current-voltage (I-V) relation was a mirror image of that of ICa. Either blockade of ICa by Co2 or replacement of Ca2 with Sr2 abolished Ito without change in I∞.... -
Developmental Changes of Gustatory Neurons in Nucleus of Solitary Tract in Rats
MiwonKim, WonjaeKim, CharlotteMistretta 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 7 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2000, Vol.4 No.3 1 169-175 (7 pages)
To learn the developmental changes in intrinsic electrophysiological properties of the second order taste neurons, whole cell recordings from the developing nucleus of the solitary tract neurons were done in brainstem slices of postnatal rats. Rats aged from postnatal 0 to 21 days (P0-P21) were used, being divided into 3 age groups: postnatal first week (P0-P7 days), second week (P8-P14 days), and third week (P15-P21 days). Slices containing gustatory NTS were cut horizontally in the thickness... -
Effect of Prostaglandins D2, E2 and I2 on the Regulation of KATP Channel Activity in Rat Cardiac Myocytes
Jeong-MinJu, Seung-YeolNah, Jae-HaKim 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 6 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 1999, Vol.3 No.5 7 507-512 (6 pages)
ATP-sensitive K channel (KATP channel) was investigated in isolated single rat ventricular cardiac myocytes using the patch clamp technique. PGD2, PGE2 and PGI2 did not affect KATP channel activity in the inside-out patch, but increased channel activity in a dose-dependent manner when the channel activities were attenuated by the administration of 100 μM ATP to the internal solution in the inside-out patch. Channel activations by the prostaglandins were abolished by 50 μM glibenclamide,... -
Altered Calcium Current of the Vascular Smooth Muscle in Renal Hypertension
SangChaeNam, HyeJeonJeong, WonjaeKim, JongUnLee 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 6 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 1999, Vol.3 No.3 13 351-356 (6 pages)
size and shape between hypertensive and normotensive rats under light microscopy. High-threshold (L-type) calcium currents were recorded using whole-cell patch clamp technique. The amplitude of the current recorded from VSM cells was larger in 2K1C hypertension than in control. Neither the voltage-dependence of the calcium current nor the cell capacitance was significantly affected by 2K1C hypertension. By contrast, the amplitude of the calcium current was not altered in DOCA-salt hypertension.... -
External pH Effects on Delayed Rectifier K+ Currents of Small Dorsal Root Ganglion Neuron of Rat
YoungHoKim, JungHyunHahn, InJaLim, SungkwonChung, HyoWeonBang 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 8 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 1998, Vol.2 No.2 4 165-172 (8 pages)
of the patch clamp technique has been applied to the recording of the responses of change of external pH on the delayed rectifier K+ current of cultured DRG neurons of rat. Outward K+ currents were examined in DRG cells, and the Charybdotoxin and Mn2+ could eliminate Ca2+-dependent K+ currents from outward K+ currents. This outward K+ current was activated around 60 mV by step depolarizing pulses from holding potential 70 mV. Outward K+ currents were decreased by low external pH....
