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Regulatory Action of ß-adrenergic Agonist and 8-bromocyclic AMP on Calcium Currents in the Unfertilized Mouse Eggs
Haan, Jae-Hee, Cheong, Seung-Jin, Kim, Yang-Mi, Park, Choon-Ok, Hong, Seong-Geun 대한생리학회 대한생리학회지 10 Pages
대한생리학회 대한생리학회지 1993, 제 27권 제 2호 6 175-184 (10 pages)
There are many report suggesting that influx and intracellular calcium concentration ([Ca2+]i) are related to cell signalling in various cells. However, it has not been reported that calcium channel activation is affected by the substances involved in signal transduction pathways in the mouse eggs. In this study, the effects of isoprenaline (ISP) and cyclic AMP on calcium influx through calcium channels were investigated to show their relationship with the signal transduction process in... -
Effect of Cyclic GMP on the Calcium Current in Rabbit Ventricular Myocytes
Han, Jin, Leem, Chae-Hun, Ahn, Chul-Soo, So, In-Suk, Kim, Eui-Yong, Ho, Won-Kyung, Earm, Yung-E 대한생리학회 대한생리학회지 12 Pages
대한생리학회 대한생리학회지 1993, 제 27권 제 2호 4 151-162 (12 pages)
In order to investigate the effect of intracellular cyclic GMP on calcium current the whole-cell patch clamp technique with internal perfusion method was used in isolated ventricular myocytes of the rabbit. Cyclic GMP, 8-bromo-cyclic GMP, cyclic AMP, isoprenaline and forskolin were perfused into cells and their effects on calcium current were analysed by applying depolarizing step pulses of + 10 mV in amplitude far 300 msec from holding potential of - 40 mV. Not only cyclic AMP (100 μM) but... -
Effect of Dopamine on the Ca2+-dependent K+ currents in Isolated Single Gastric Myocytes of the Guinea-pig
Rhee, Poong-Lyul, Lee, Sang-Jin, Kim, Sung-Joon, So, In-Suk, Hwang, Sang-Ik, Kim, Ki-Whan 대한생리학회 대한생리학회지 12 Pages
대한생리학회 대한생리학회지 1993, 제 27권 제 2호 3 139-150 (12 pages)
We have reported that dopamine potentiates spontaneous contractions dose-dependently in guinea-pig antral circular muscle strips (Hwang et al, 1991). To clarify the underlying excitatory mechanism of dopamine on the gastric smooth muscle, the effects of dopamine on voltage-dependent Ca2+ currents and Ca2+ -dependent K+ currents were observed in enzymatically dispersed guinea-pig gastric myocytes using the whole-cell voltage-clamp technique. Experiments were also done using isometric tension... -
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)
were increased in eggs treated with GTP (or GTPγS) or fluoroaluminate (AIF_4-). In the hamster egg these increments were antagonized by GDP (or GDPβS) application. In contrast to the enhancement of ica, ik was reduced following GTP (or GTPγS) perfusion in mouse eggs. The transient component (ito) in hamster eggs was increased by adding GTP but decreased by phorbol ester, TPA or dioctanoyl glycerol (DOG). Simultaneous application of GTPγS and DOG suppressed ito more effectively than a single... -
Calcium Current and Background Current Activation in L-triiodothyronine Loaded Ventricular Myocytes of the Rabbit
Han, Jin, Kim, Eui-Yong, Han, Jae-Hee, Park, Choon-Ok, Hong, Seong-Geun, Leem, Chae-Hun, So, In-Suk, Ho, Won-Kyung, Earm, Yung-E, Sung, H 대한생리학회 대한생리학회지 14 Pages
대한생리학회 대한생리학회지 1992, 제 26권 제 2호 1 99-112 (14 pages)
Langendorff perfusion with collagenase. Cardiac myocytes were incubated in low-Cl-,, high-K+ medium containing 1μM L-triiodothyronine (T3) at 4℃ for 2.10 hours. The calcium currrent (ICa) was increased in T3 loaded cells, however, the shape of current voltage curve and reverse potential did not altered. Cyclic AMP, cyclic GMP, isoprenaline and 3-isobutyl-1-methyl-xanthine increased ICa in euthyroid and hyperthyroid conditions, and acetylcholine blocked the increase of ICa in T3 loaded cells.... -
A Study on the Na+/Ca2+ Exchange Mechanism in the Smooth Muscle of Guinea-pig Stomach
Kim, Eui-Yong, Han, Jin, Kim, Ki-Whan 대한생리학회 대한생리학회지 14 Pages
대한생리학회 대한생리학회지 1992, 제 26권 제 1호 6 55-68 (14 pages)
The effects of changes in extracellular Na+ and Ca+ concentration on the membrane potential and contractility were studied in the antral circular muscle of guinea pig stomach in order to elucidate the existence and the nature of Na+/Ca2+ exchange mechanism. All experiments were performed in tris buffered Tyrode solution which was aerated with 100% O2 and kept at 35℃. The treatment of 10-5 ouabain was performed to induce intracellular Na+ loading prior to the start of experiment. The results... -
Characteristics of Synthesized Red Cells Using Bovine Hemoglobin as Oxygen Carrier
Cho, Eng-Haeng, Hah, Jong-Sik, Kim, Ku-Ja 대한생리학회 대한생리학회지 8 Pages
대한생리학회 대한생리학회지 1992, 제 26권 제 1호 4 37-44 (8 pages)
The encapsulation of the Purified bovine hemoglobin with Phospholipids obtained from egg folk was performed using a rotary vacuum evaporator. The prepared Hb-containing liposome (hemosome) had good properties as artificial red blood cell. The shape and size of the hemosomes were measured by a phase contrast microscope and image analyzer. The function of the hemosome as oxygen carrier was tested by measuring oxygen saturation curve with blood gas analyzer and infusing it into rats. The prepared... -
Cl--sensitive Component of Ca2+-activated Tail Current in Rabbit Atrial Myocytes
Park, Choon-Ok, So, In-Suk, Ho, Won-Kyung, Kim, Woo-Gyeum, Earm, Yung-E 대한생리학회 대한생리학회지 10 Pages
대한생리학회 대한생리학회지 1992, 제 26권 제 1호 3 27-36 (10 pages)
a holding potential of -70 mV. The potassium currents were blocked by external 4-aminopyridine and replacement of internal potassium with cesium. The current was reversed to the outward direction above +10 mV. High concentrations of intracellular calcium buffer inhibited the activation of the current. Diltiazem and ryanodine blocked it too. These data suggest that the current is activated by intracellular calcium released from sarcoplasmic reticulumn. When the internal chloride concentration was... -
Ionic Dependence and Modulatory Factors of the Background Current Activated by Isoprenaline in Rabbit Ventricular Cells
Leem, Chae-Hun, Lee, Suk-Ho, So, In-Suk, Ho, Won-Kyung, Earm, Yung-E 대한생리학회 대한생리학회지 12 Pages
대한생리학회 대한생리학회지 1992, 제 26권 제 1호 2 15-26 (12 pages)
In order to elucidate the properties of the background current whole cell patch clamp studies were performed in rabbit ventricular cells. Ramp pulses of ±80 mV from holding potential of 40 mV(or 20 mV) at the speed of 0.8 V/sec were given every 30 sec(or 10 sec) and current-voltage diagrams(I-V curve) were obtained. For the activation of the background current isoprenaline, adenosine 3 ,5 -cyclic monophosphate(dBcAMP), guanosine 3 ,5 -cyclic monophosphate(cGMP), and N6-2 -o-dibutyryladenosine 3... -
Voltage-Dependent Inactivation of Calcium Currents in the Mouse Eggs
Park, Young-Geun, Yang, Young-Seon, Yum, Myung-Kul, Hong, Seong-Geun 대한생리학회 대한생리학회지 8 Pages
대한생리학회 대한생리학회지 1991, 제 25권 제 2호 3 125-132 (8 pages)
Inactivation properties of Ca current in the unfertilized eggs of mouse were studied by using the whole cell voltage clamp technique and single microelectrode voltage clamp technique. Membrane potential was held at -80 mV and step depolarization was applied from -50 mV to 50 mV for 200 ~ 500 ms. Peak of inward Ca currents was -2 ~ -4 nA at a membrane Potentials from -20 mV to 0 mV and outward currents were not observed within the membrane voltage range studied (-50 ~ 50 mV). Inward currents were...
