[논문]Role of nitric oxide in the regulation of the hepatic microcirculation in vivo

Bauer, C.; Walcher, F.; Kalweit, U.; Larsen, R.; Marzi, I.

doi:10.1016/S0168-8278(97)80153-5

[해외논문] Role of nitric oxide in the regulation of the hepatic microcirculation in vivo

Journal of hepatology : the journal of the European Association for the Study of the Liver, v.27 no.6, 1997년, pp.1089 - 1095

Bauer, C. (aDepartments of Anesthesiology and Critical Care Medicine, University of Saarland Medical School, ,, Homburg, Germany) , Walcher, F. , Kalweit, U. , Larsen, R. , Marzi, I.

Abstract ▼ AI-Helper

Background/Aims: Nitric oxide (NO) is an important mediator in the regulation of vascular tone. However no data exist on the physiological role of NO in the regulation of the hepatic microcirculation. This tudy was designed to evaluate the role of NO in the hepatic microcirculation in vivo under physiological conditions.Methods: The hepatic microcirculation was investigated in anesthetized rats by intravital fluorescence microscopy after injection of fluorescein-isothiocyanate-labeled erythrocytes. Following assessment of baseline sinusoidal perfusion, animals were randomly treated with L-NMMA (n=6), L-arginine (n=6), nitroprusside sodium (NPS, n=5) or a comparable volume of NaCl (n=4). Drugs were given through a portal vein catheter at three doses (Dx), each followed by intravital microscopy. L-NMMA was given: 5 mg/kg (D1), 25 mg/kg (D2), 50 mg/kg (D3); L-arginine 30 mg/kg (D1), 150 mg/kg (D2), 300 mg/kg (D3); and NPS continuously 80 μ.kg-1.h-1.Results: L-NMMA, induced a significant increase of mean arterial blood pressure (MAP) (114 vs. 129 mm Hg; p<0.05). In contrast, MAP of NPS-treated animals decreased (107 vs. 91 mm Hg; p<0.01) whereas MAP of animals receiving L-arginine did not significantly differ. Sinusoidal blood flow revealed dose-dependent changes: L-NMMA significantly decreased perfusion of sinusoids (D1: 65%, D2: 57%, D3: 50% of baseline, p<0.05). Injection of L-arginine increased the sinusoidal flow even with the lowest dose (D1: 137%, D2: 133%, D3: 123%, p<0.05). Continuous infusion of NPS had little effect on sinusoidal blood flow at the first and second times of microscopy but sinusoidal blood flow was significantly increased at the third time (D1: 103%, D2: 106%, D3: 122%).Conclusions: Inhibition of NOS results in a dose-dependent disturbance of the hepatic microcirculation despite significantly increased MAP, whereas L-arginine increases the sinusoidal blood flow. The results indicate an important role for NO in the regulatory mechanisms of hepatic sinusoidal perfusion under physiological conditions.

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DOI : 10.1016/S0168-8278(97)80153-5
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