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Intrinsic Gating in Inward Rectifier Potassium Channels (Kir2.1) with Low Polyamine Affinity Generated by Site Directed Mutagenesis
ISo, , IAshmole, HSoh, CSPark, PJSpencer, MLeyl, PRStanfield, 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 12 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2003, Vol.7 No.3 3 131-142 (12 pages)
We have studied mutant forms of Kir2.1 in which an aspartate residue (D172), important for gating by intracellular polyamines, is replaced by one of three basic residues (Arg, Lys or His). Such channels are highly selective for K+, but show inward rectification that is a shallow function of voltage compared with that found in wild type. This inward rectification occurs with a reduced affinity for spermine and persists in the absence of polyamines. Though the unitary current-voltage relation... -
Phytoestrogen-Induced Phosphorylation of MAP Kinase in Osteoblasts is Mediated by Membrane Estrogen Receptor
YounHeePark, HwanKiPark, HyoJinLee, SunMuPark, SangWonChoi, WonJungLee 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 6 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2002, Vol.6 No.3 7 165-170 (6 pages)
We have previously demonstrated that phytoestrogens isolated from safflower seeds significantly attenuated bone loss in ovariectomized rats, and directly stimulated proliferation and differentiation of cultured osteoblastic cells. In an attempt to elucidate underlying cellular mechanisms, in the present study we investigated effects of 17β-estradiol (E2) and phytoestrogens such as matairesinol and acacetin, a type of lignan and flavonoid, respectively, on activation of mitogen activated... -
Analysis of a Sphingosine 1-phosphate Receptor hS1P3 in Rat Hepatoma Cells
Dong-SoonIm 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 4 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2002, Vol.6 No.3 2 139-142 (4 pages)
To examine intracellular signaling of human S1P3 (hS1P3), a sphingosine 1-phosphate (S1P) receptor in plasma membrane, hS1P3 DNA was transfected into RH7777 rat hepatoma cell line, and the inhibition of forskolin-induced cAMP accumulation and activation of MAP kinases by S1P were tested. In hS1P3 transformants, S1P inhibited forskolin-induced activation of adenylyl cyclase activity by about 80% and activated MAP kinases in dose-dependent and pertussis-toxin (PTX) sensitive manners. In oocytes... -
Modulation of Ca2+-Activated Potassium Channels by cGMP- Dependent Signal Transduction Mechanism in Cerebral Arterial Smooth Muscle Cells of the Rabbit
JinHan, NariKim, KwangbokLee, EuiyongKim 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 6 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2000, Vol.4 No.6 2 439-444 (6 pages)
The present investigation tested the hypothesis that the activation of protein kinase G (PKG) leads to a phosphorylation of Ca2-activated potassium channel (KCa channel) and is involved in the activation of KCa channel activity in cerebral arterial smooth muscle cells of the rabbit. Single-channel currents were recorded in cell-attached and inside-out patch configurations of patch-clamp techniques. Both molsidomine derivative 3-morpholinosydnonimine-N-ethylcarbamide (SIN-1, 50μM) and... -
Different Effects of Dopamine on Differential Rotational Mobility between Inner and Outer Monolayer of Synaptosomal Plasma Membrane Vesicles Isolated from Bovine Brain
Hyun-GangKim, Chang-HwaChoi, Inn-SeKim, In-KyoChung, Goon-JaeCho, Hye-OckJang6, IlYun 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 7 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2000, Vol.4 No.5 10 409-415 (7 pages)
Fluorescence polarization of 1,6-diphenyl-1,3,5-hexatriene (DPH) was used to evaluate the effects of dopamine·HCl on the range of the rotatioanl mobility of bulk bilayer structure of the synaptosomal plasma membrane vesicles (SPMV) isolated from whole bovine brain. In a dose-dependent manner, dopamine decreased the anisotropy (γ), limiting anisotropy (γ∞) and order parameter (S) of DPH in the membranes. These indicate that dopamine increased the rotational mobility of the probe in the... -
Effect of Lidocaine·HCl on Microviscosity of Phosphatidylcholine Model Membrane
In-KyoChung, Inn-SeKim, Chang-HwaChoi, Goon-JaeCho, Jin-BomKim, Woo-SungSon6, Hye-OckJang7, IlYun8 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 9 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2000, Vol.4 No.3 9 243-251 (9 pages)
In order to provide a basis for studying the molecular mechanism of pharmacological action of local anesthetics and to develop a fluorescence spectroscopic method which can detect the microviscosity of native and model membranes using intramolecular excimerization of 1,3-di(l-pyrenyl)propane (Py-3-Py), we examined the effect of lidocaine·HCl on the microviscosity of model membranes of phosphatidylcholine fraction extracted from synaptosomal plasma membrane vesicles (SPMVPC). The excimer to... -
Neurotensin Enhances Gastric Motility in Antral Circular Muscle Strip of Guinea-pig
TaeYongKoh, SungJoonKim, SangJinLee, TongMookKang, JaeYeoulJun, JaeHoonSim, InsukSo, KiWhanKim 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 8 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2000, Vol.4 No.3 7 227-234 (8 pages)
Many reports suggest that neurotensin (NT) in the gastrointestinal tract may play a possible role as a neurotransmitter, a circulating hormone, or a modulator of motor activity. NT exerts various actions in the intestine; it produces contractile and relaxant responses in intestinal smooth muscle. This study was designed to investigate the effect of NT on motility of antral circular muscle strips in guinea-pig stomach. To assess the role of Ca2 influx in underlying mechanism, slow waves... -
Differential Effects of Local Anesthetics on Rate of Rotational Mobility between Hydrocarbon Interior and Surface Region of Model Membrane Outer Monolayer
In-KyoChung, Seong-KweonCha, Yong-ZaChung, Bong-SunKim, Chang-HwaChoi, Goon-JaeCho6, Hye-OckJang7, IlYun 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 6 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2000, Vol.4 No.1 6 41-46 (6 pages)
Using fluorescence polarization of 12-(9-anthroyloxy)stearic acid (12-AS) and 2-(9-anthroyloxy)stearic acid (2-AS), we evaluated the differential effects of local anesthetics on differential rotational rate between the surface (in carbon number 2 and its surroundings including the head group) and the hydrocarbon interior (in carbon number 12 and its surroundings) of the outer monolayer of the total lipid fraction liposome extracted from synaptosomal plasma membrane vesicles. The anisotropy (r)... -
Effects of Site-Mutagenesis of an Amino Acid Triplet Repeat atM1 and M2 Muscarinic Receptors on Receptor Function
이석용(Seok-Yong Lee), 이상복(Sang-Bok Lee) 대한약리학회 대한약리학잡지 12 Pages
대한약리학회 대한약리학잡지 1996, 제 32권 제 3호 3 311-322 (12 pages)
Both M1 and M2 muscarinic receptors contain a triplet of amino acid residues consisting of leucine (L), tyrosine (Y) and threonine (T) at C-terminus ends of the second putative transmembrane domains. This triplet is repeated as LYT-LYT in M2 receptors at the interface between the second transmembrane domain and the first extracellular loop. Interestingly, however, it is repeated in a transposed fashion (LYT-TYL) in the sequence of M1 receptors. In this work, we employed site-directed mutagenesis... -
Ethanol이 배양된 Mouse Myeloma Cell Line Sp2/0-Ag14로부터 분리한 형질막의 유동성에 미치는 영향
윤일(Il Yun), 정인교(In-Kyo Chung), 박영민(Yeong-Min Park), 김진범(Jin-Bom Kim), 유성호(Seoung-Ho Yu), 강정숙(Jung-Sook Kang) 대한약리학회 대한약리학잡지 8 Pages
대한약리학회 대한약리학잡지 1993, 제 29권 제 1호 15 149-156 (8 pages)
Ethanol이 암세포 증식 속도에 미치는 직접적인 영향 검색의 일환으로 배양된 mouse myeloma cell line Sp2/0-Ag14로부터 분리한 형질막 (Sp2/0-PMV) 유동성에 미치는 ethanol의 영향을 형광분석법으로 측정하였다. 그 결과 ethanol은 Sp2/0-PMV 지질 이중층 측방확산운동의 범위와 속도를 증가시켰고 회전확산운동 범위도 증가시켰다. 특히 ethanol은 Sp2/0-PMV 지질이중층 중 내부단층 (inner monolayer)에 비하여 비교적 선택적으로 외부단층 (outer monolayer)의 회전확산운동 범위를 증가시킨다는 것을 확인하였다.
