자료유형
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Thyroid Hormone-Induced Alterations of Ryanodine and Dihydropyridine Receptor Protein Expression in Rat Heart
HaeWonKim, MiyoungPark, EunHeeLee, HyoungJinCho, HeeRanLee 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 9 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 1999, Vol.3 No.3 11 329-337 (9 pages)
Ca2 release channel of the SR, is responsible for the rapid release of Ca2 that activates cardiac muscle contraction. In the excitation-contaction coupling cascade, activation of ryanodine receptors is initiated by the activity of sarcolemmal Ca2 channels, the dihydropyridine receptors. In hyperthyroidism left ventricular contractility and relaxation velocity were increased, whereas these parameters were decreased in hypothyroidism. The mechanisms for these changes have been... -
Evidence for Adenosine Triphosphate (ATP) as an Excitatory Neurotransmitter in Guinea-Pig Gastric Antrum
TongMookKang, WenxieXu, SungJoonKim, SeungCheolAhn, YoungChulKim, InsukSo, MyoungKyuPark, Dae-YongUhm, KiWhanKim 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 10 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 1999, Vol.3 No.2 6 165-174 (10 pages)
Both the rebound-contraction and the agonist-induced contraction were not inhibited by indomethacin. The rank orders of agonists' potency were 2-MeSATP ＞ ATP ≥ UTP for contraction and α,β-MeATP ≥ β,γ-MeATP for inhibition of the phasic contraction, that accord with the commonly accepted rank order of the classical P2Y-purinoceptor subtypes. Electrical activities of smooth muscles were only slightly influenced by ATP and 2-MeSATP, whereas α,β-MeATP attenuated slow waves with membrane... -
Regulation of Magnesium Release by cAMP during Chemical Hypoxia in the Rat Heart and Isolated Ventricular Myocytes
JinShangKimAntonioScarpa 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 10 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 1999, Vol.3 No.1 8 59-68 (10 pages)
Chemically induced hypoxia has been shown to induce a depletion of ATP. Since intracellular free Mg2 ([Mg2]i) appears to be tightly regulated following cellular energy depletion, we hypothesized that the increase in [Mg2]i would result in Mg2 extrusion following hormonal stimulation. To determine the relation between Mg2 efflux and cellular energy state in a hypoxic rat heart and isolated myocytes, [Mg2]i, ATP and Mg2 content were measured by... -
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)
release, 45% of SR 45Ca2, was observed in control heart. The release of diabetic heart was 20% and it was 30% in insulin-treated diabetic heart. Our results showed that the activities of both SR Ca2-ATPase and SR Ca2 release channel were decreased in diabetic heart. In order to evaluate how these two factors contribute to SR Ca2 storage, the activity of SR Ca2-ATPase was measured in the uncoupled leaky vesicles. The uncoupling effect which is able to increase... -
Roles of Na+-Ca2+ Exchange in the Negative Force-Frequency Relationship
ChangMannKoSoonJinKim 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 10 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 1998, Vol.2 No.6 8 715-724 (10 pages)
Frequency-force relationships (FFR) were studied in electrically field stimulated rat left atria (LA) by reducing the stimulation frequency from resting 3 Hz to test frequencies (0.1-1 Hz) for 5 minutes. The twitch amplitudes of LA elicited the typical negative staircases with 3-phased changes: the initial rapid increase, the second decrease and the following plateau at test frequencies. Verapamil (3⁓105 M) pretreatment elicited frequency-dependent suppression of the twitch... -
Moderate Elevation of Extracellular K+ Concentration Induces Vasorelaxation in Isolated Rat, Rabbit and Human Cerebral Arteries Role of Na Pump and Ba-Sensitive Process
DongHoKim, SungJoonKim, SangJinLee, SungJinPark, KiWhanKim 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 10 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 1998, Vol.2 No.6 7 705-714 (10 pages)
species, while histamine (10∼50 ㄍM) evoked contraction only in the rabbits and induced relaxation in the rats and humans. Addition of K (2∼10 mM) to the control solution induced vasorelaxations. These effects were inhibited by the pretreatment with both ouabain (10 ㄍM) and Ba2 (0.1∼0.3 mM) in the rat, but only with ouabain (10 ㄍM) in the rabbit and human. These results suggest that K-induced vasorelaxation occurs via the stimulation of electrogenic Na... -
Sensitivity of Rabbit Cerebral Artery to Serotonin is Increased with the Moderate Increase of Extracellular K+
SukHyoSuh, SungJinPark, JaiYoungChoi, JaeHoonSim, YoungChulKim, SungJoonKim, InsukSo, KiWhanKim 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 9 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 1998, Vol.2 No.6 6 695-703 (9 pages)
[K]O can be increased under a variety of conditions including subarachnoid hemorrhage. The increase of [K]O in the range of 5∼15 mM may affect tensions of blood vessels and can change their sensitivity to various vasoactive substances. Therefore, it was examined in the present study whether the sensitivity of cerebral arteries to vasoactive substances can be changed with the moderate increase of [K]O, using Mulvany-type myograph and [Ca2]c measurement. The... -
Pharmacological Characterization of Synthetic Tetrahydroisoquinoline Alkaloids, YS 51 and YS 55, on the Cardiovascular System
Ki-ChurlChang, Young-JinKang, Young-SooLee, Won-SeogChong, Hye-SookYun-Choi, Duck-HyongLee, Jae-ChunRyu 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 9 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 1998, Vol.2 No.4 8 461-469 (9 pages)
curves to PE were shifted to right by the pretreatment with YS 51 or YS 55. The pA2 values of YS 51 and YS 55 showed 6.050.24 and 5.880.16, respectively. Both probes relaxed KCl (65.4 mM)-contracted aorta and inhibited CaCl2-induced contraction of PE-stimulated endothelium- denuded rat thoracic aorta in Ca2-free solutions. In isolated guinea pig papillary muscle, 1 and 10 ㄍM YS 51 increased contractile force about 4- and 8- fold over the control, respectively, along... -
Mechanism of Vasoactive Intestinal Polypeptide-Induced Catecholamine Secretion from the Rat Adrenal Medulla
Dong-YoonLim, Jae-BongHeo, Cheol-HeeChoi, Geon-HanLim, Yong-GyoonLee, Song-HoonOh, Il-SikKim, Jong-InKim 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 12 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 1998, Vol.2 No.4 6 443-454 (12 pages)
The present study was attempted to investigate the effect of vasoactive intestinal polypeptide (VIP) on secretion of catecholamines (CA) and to establish whether there is the existence of a noncholinergic mechanism in adrenomedullary CA secretion from the isolated perfused rat adrenal gland. The perfusion into an adrenal vein of VIP (3⁓106 M) for 5 min or the injection of acetylcholine (ACh, 5.32⁓103 M) resulted in great increases in CA secretion. Tachyphylaxis to...
