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심근세포 및 혈관 평활근에 대한 Nitric Oxide 작용의 민감성의 차이
박춘옥(Choon Ok Park), 강영진(Young Jin Kang), 이회영(Hoi Young Lee), 장기철(Ki Churl Chang) 대한약리학회 대한약리학잡지 6 Pages
대한약리학회 대한약리학잡지 1995, 제 31권 제 3호 2 279-284 (6 pages)
본 연구의 목적은 외부에서 nitric oxide (NO)를 투여 하였을때 심근 수축력, 심박동수의 변화 및 혈관 평활근에 대한 효과를 비교함으로서 NO에 대한 이들 장기의 민감도가 서로 같은지 또는 상이한지를 알아보고자 하였다. 본 실험에서는 PIANO 방법에 의한 근장력의 변화와 아울러 심근에서의 Ca2+ current를 측정하였다. 랫트의 심방근에 대한 PIANO (STZ, 100μM)는 심근수축력 및 심박동수에 전혀 변화를 주지 않았지만 혈관 평활근에서는 강한 이완 작용을 나타내었다. 한편, 8-Br-cGMP도 고농도 (100μM)에서만 심근 수축력을... -
뇌의 허혈-재관류손상에 대한 연구: 혈소판활성인자의 관련
이원석(Won-Suk Lee), 임병용(Byung-Yong Rhim), 홍기환(Ki-Whan Hong) 대한약리학회 대한약리학잡지 8 Pages
대한약리학회 대한약리학잡지 1993, 제 29권 제 1호 1 1-8 (8 pages)
뇌의 허혈-재관류 손상에 있어서 혈소판 활성인자 (PAF, platelet activating factor)의 관련을 증명하기 위하여 흰쥐와 생쥐에서 양측 총경동맥을 10분간 결찰하고 그후 6시간동안 재관류시켜 허혈-재관류 손상을 야기시켰다. 생쥐에 PAF 길항제인 BN52021과 CV6209 (각각 1 mg/kg, i.p.)를 총경동맥결찰 10분전 또는 재관류 시작 1시간 후에 투여시 McGram stroke index는 심하게 억제되었다. 흰쥐와 생쥐에서 뇌허혈-재관류에 의한 뇌수분함량의 증가는 BN52021 또는 CV6209 전처치에 의하여 유의하게 억제되었다. BN52021 전처치는... -
Majarine 유도체인 majarol의 흰쥐에 있어서 혈압 및 심박동수에 대한 작용과 적출 개구리 심장에 대한 작용
이종화(Jong-Hwoa Lee), 박영현(Young-Hyun Park), 조병헌(Byung-Heon Cho), 김유재(Yu-Jae Kim), 김종배(Jong-Bae Kim), 김천숙(Chun-Sook Kim), 차영덕(Young-Deog 대한약리학회 대한약리학잡지 11 Pages
대한약리학회 대한약리학잡지 1986, 제 22권 제 1호 3 34-44 (11 pages)
본 실험실에서는 한국 특산인 매자나무 (Berberis koreana Palibin)의 뿌리에서 majarine(isoquinoline alkaloid)을 분리하여 여러 가지의 약리작용을 검토한 바 있다. 현재는 majarine의 화학적 구조를 변화시켜 그 유도체의 약리작용을 검색하고 있으며, 그 중 majarine의 isoquinoline ring에 치환되어 있는 두 methoxy group 중 하나를 hydroxy기로 치환된 majarol을 합성하였다. Majarol을 흰쥐 정맥내로 투여하여 혈압 및 심박동수의 변화와 epinephrine, phentolamine, isoproterenol, propranolol, atropine, diphenhydramine과... -
Contractile and Electrical Responses of Guinea-pig Gastric Smooth Muscle to Bradykinin
Kim, Chul-Soo, Jun, Jae-Yeoul, Kim, Sung-Joon, So, In-Suk, Kim, Ki-Whan 대한생리학회 대한생리학회지 10 Pages
대한생리학회 대한생리학회지 1995, 제 29권 제 2호 5 233-242 (10 pages)
(transient contraction-transient relaxation-sustained contraction) and this response was unaffected by pretreatment with neural blockers (tetrodotoxin, atropine and guanethidine) or with apamin. Bradykinin induced hyperpolarization of resting membrane potential and enhanced the amplitude of slow waves and spike potentials. The enhancement of spike potentials was blocked by neural blockers. Both the bradykinin-induced contractions and changes in membrane potential were reversed by the selective... -
Properties of Single K+ Channels of Skeletal Muscle Incorporated into Planar Lipid Bilayer
Park, Jin-Bong, Kim, Hee-Jeong, Cho, Myung-Haing, Lee, Hang, Park, Hong-Ki, Lee, Mun-Han, Ryu, Pan-Dong 대한생리학회 대한생리학회지 16 Pages
대한생리학회 대한생리학회지 1995, 제 29권 제 1호 2 13-28 (16 pages)
single K+ channels of skeletal muscle from the rat and frog were into planar lipid bilayers and their properties were studied. Fusion was induced by an osmotic gradient. Of the four types of K+ channels recorded, the two most frequently observed were a voltage and Ca2+-activated K+ channel and a K+ channel with a prominent conductance substate. The first K+ channel was identified as the large Ca2+-activated K+ (BK) channel because the open-state probability was increased with depolarization... -
Role of Na+Ca2+ Exchange in the Control of Contractility in Rabbit Basilar Arterial Smooth Muscle
Kim Eui-Yong, Han Jin 대한생리학회 대한생리학회지 10 Pages
대한생리학회 대한생리학회지 1994, 제 28권 제 2호 6 159-168 (10 pages)
The contraction of rabbit basilar artery was examined as a function of changes in the Na+ electrochemical gradient in order to determine the contribution of Na+/Ca2+ exchange to the modulation of contractility. Ouabain (10-5 M) or K+-free Tyrode solution caused an increase in tonic tension even in the presence of a Ca2+ channel blocker (10-6 M verapamil) and an α-receptor blocker (10-5 M phentolamine). After treatment with ouabain (10-5 M), contractions were augmented by reduction of external... -
The Excitatory Mechanism of Substance P in the Antral Circular Muscle of Guinea Pig Stomach
Jun, Jae-Yeoul, Kim, Sung-Joon, Choi, Youn-Baik, Kim, Ki-Whan 대한생리학회 대한생리학회지 10 Pages
대한생리학회 대한생리학회지 1994, 제 28권 제 1호 5 51-60 (10 pages)
waves in muscle strips. Voltage-dependent Ca2+ currents were increased by the application of Substance P from a holding potential of -60mV to 50mV in 10mV steps and this effect was blocked by the addition of an antagonist. Also Substance P increased transient and spontaneous oscillatory K+ outward currents. The enhanced outward currents were abolished by apamin in dispersed single cells. These results suggest that the depolarization of membrane potential by Substance P activates voltage-dependen... -
Effects of Lemakalim, a Potassium Channel Opener, on the Contractility and Electrical Activity of the Antral Circular Muscle in Guinea-Pig Stomach
Kim, Sung-Joon, Jun, Jae-Yeoul, Choi, Youn-Baik, Kim, Ki-Whan, Kim, Woo-Gyeum 대한생리학회 대한생리학회지 14 Pages
대한생리학회 대한생리학회지 1994, 제 28권 제 1호 4 37-50 (14 pages)
Synthetic potassium channel openers (KCOs) are agents capable of opening K-channels in excitable cells. These agents are known to have their maximal potency in the smooth muscle tissue, especially in the vascular smooth muscle. Much attention has been focused on the type of K-channel that is responsible for mediating the effects of KCOs. As the KCO-induced changes are antagonized by glibenclamide, an KATP (ATP-sensitive K-channel) blocker in the pancreatic β-cell, KATP was suggested to be the... -
Electrophysiological Analysis of GABA and Glycine Action on Neurons of the Catfish Retina
Bai, Sun-Ho, Jung, Chang-Sub, Lee, Sung-Jong 대한생리학회 대한생리학회지 12 Pages
대한생리학회 대한생리학회지 1993, 제 27권 제 2호 5 163-174 (12 pages)
Vertebrate retinal neurons, like brain tracts farm complex synaptic relations in the enter and inner plexiform layers which ape equivalent to the central nervous system nuclei. The effects of γ-aminobutyric acid(GABA) and glycine on retinal neurons were explored to discern the mechanisms of action of neurotransmitters. Experiments were performed in the superfused retina-eyecup preparation of the channel catfish, Ictalurus punctatus, using intracellular electrophysiological techniques. The roles... -
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...
