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Reduction of Muscarinic K+ Channel Activity by Transferrin in Ischemic Rat Atrial Myocytes
KyeongTaePark, DawonKang, JaeheeHan, Jae-YongPark, Chang-GiHur, Seong-GeunHong 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 7 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2003, Vol.7 No.6 7 333-339 (7 pages)
a protein of ∼80 kDa was markedly reduced or even lost in IC. By using peptide sequencing analysis and Western blot, this 80 kDa protein was identified as transferrin (receptor-mediated Fe3 transporter, 76 kDa). Direct application of transferrin (100 nM) to the cytoplasmic side of inside-out patches decreased the open probability (Po, 12.7⁑6.4%, n=4) without change in mean open time (τo, 98.5⁑1.3%, n=4). However, the equimolar apotransferrin, which is free of Fe3, had... -
Increase of Intracellular Ca2+ Concentration Induced by Lysophosphatidylcholine in Murine Aortic Endothelial Cells
MeiHongZhu, SungJinPark, HyunJinKim, DongKiYang, SukHyoSuh, InsukSo, KiWhanKim 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 8 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2002, Vol.6 No.2 5 93-100 (8 pages)
Effects of oxidized low-density lipoprotein (ox-LDL), l-α-stearoyl-lysophosphatidylcholine (LPC), on intracellular Ca2 concentration were examined in mouse endothelial cells by measuring intracellular Ca2 concentration ([Ca2]i) with fura 2-AM and reverse transcription-polymerase chain reaction (RT-PCR). LPC increased [Ca2]i under the condition of 1.5 mM [Ca2]o but did not show any effect under the nominally Ca2-free condition. Even after the store... -
Muscarine M2 Receptor-mediated Presynaptic Inhibition of GABAergic Transmission in Rat Meynert Neurons
Il-SungJangNorioAkaike 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 8 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2002, Vol.6 No.2 1 63-70 (8 pages)
protein uncoupler, attenuated the inhibitory action of muscarine on GABAergic mIPSC frequency. Muscarine still could decrease GABAergic mIPSC frequency even in the Ca2-free external solution. However, the inhibitory action of muscarine on GABAergic mIPSCs was completely occluded in the presence of forskolin. The results suggest that muscarine acts presynaptically and reduces the probability of spontaneous GABA release, and that such muscarine-induced inhibitory action seems to be mediated... -
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... -
Decrease in Ca2+ Storage in the Cardiac Sarcoplasmic Reticulum of Diabetic Rat
Won-TaeKim, HaeWonKim, Young-KeeKim 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 8 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 1998, Vol.2 No.6 9 725-732 (8 pages)
SR Ca2-ATPase was measured in the uncoupled leaky vesicles. The uncoupling effect which is able to increase the activity of SR Ca2-ATPase was observed in control heart; however, no significant increments of SR Ca2-ATPase activities were measured in both diabetic and insulin-treated diabetic rats. These results represent that the Ca2 storage in SR is significantly depressed and, therefore, Ca2-sequestering activity of SR may be also depressed in diabetic heart. -
Regulation of Adenosine Receptors in Rat Brain following Chronic Carbamazepine Treatment
KyungSunPark, WanSukYang, KyungHwanKim 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 5 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 1997, Vol.1 No.1 2 13-17 (5 pages)
basal activity; 17.8% decrease in maximal activity). The basal and 10-4 M forskolin-stimulated adenylyl cyclase activities were relatively unaffected by CBZ treatment, but 10 mM NaF-stimulated adenylyl cyclase activity was significantly reduced in CBZ-treated rats. It appears that one-week CBZ treatment caused an uncoupling of adenosine receptors from G proteins without alteration of A1 adenosine receptor molecules, suggesting that CBZ acts as an agonist at A1 adenosine receptors in rat brain. -
공황장애에서 Paroxetine 치료반응을 예측할 수 있는 생물학적 지표
박주언, 유범희 대한신경정신의학회 신경정신의학 9 Pages
대한신경정신의학회 신경정신의학 2005, 제 44권 제 2호 14 238-246 (9 pages)
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흰쥐 대뇌피질에서 A1 아데노신 수용체의 탈감작
박경선(Kyung Sun Park), 양완숙(Wan Suk Yang), 김경환(Kyung Hwan Kim) 대한약리학회 대한약리학잡지 8 Pages
대한약리학회 대한약리학잡지 1996, 제 32권 제 2호 3 151-158 (8 pages)
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Inverse Agonists at A_1Adenosine Receptors in Rat Cerebral Cortex
박경선(Kyung Sun Park), 양완숙(Wan Suk Yang), 김경환(Kyung Hwan Kim) 대한약리학회 대한약리학잡지 8 Pages
대한약리학회 대한약리학잡지 1996, 제 32권 제 1호 3 23-30 (8 pages)
According to the traditional receptor model, competitive antagonists share with agonists the ability to bind to a common site on receptors, but they are different from agonist in that they cannot trigger the biological response-i.e., they lack intrinsic efficacy. Recent findings extend the model by indicating that not all antagonists display an intrinsic efficacy of zero but that some display inverse agonism . In the present study we studied the inverse agonism at A1 adenosine receptors in... -
Sodium nitroprusside와 Forskolin의 Phorbol ester 수축에 대한 혈관이완작용의 기전
안희열(Hee Yul Ahn) 대한약리학회 대한약리학잡지 8 Pages
대한약리학회 대한약리학잡지 1995, 제 31권 제 3호 4 291-298 (8 pages)
본 연구의 목적은 protein kinase C의 활성물질인 phorbol ester의 수축에 대한 cGMP 및 cAMP의 조절기전을 명확히 하기 위하여 흰쥐의 대동맥을 재료로 실험을 수행하였다. Sodium nitroprusside는 guanylyl cyclase를 활성화시켜 cGMP를, forskolin은 adenylyl cyclase를 활성화시켜서 cAMP를 증가시키는 것으로 보고되어 있으므로 위의 두 약물을 선택하였다. Phorbol ester는 시간경과와 함께 지속적인 수축을 발생하였으며 30분경 안정상태에 도달하였다. 동시에 20-kDa myosin light chain (MLC)의 인산화도 증가하였으며 30분경...
