Dobutamine improves liver function after hemorrhagic shock through induction of heme oxygenase-1.

RATIONALE Induction of heme oxygenase-1 (HO-1) protects the liver against reperfusion injury after hemorrhagic shock. Previous data suggest that the beta(1)-adrenoceptor agonist dobutamine induces HO-1 in hepatocytes. OBJECTIVES To investigate the functional significance of dobutamine pretreatment for liver function after hemorrhagic shock in vivo. METHODS Anesthetized rats received either Ringer's (Vehicle/Shock), 10 microg/kg/min of the beta(1)-adrenoceptor agonist dobutamine (Dob/Shock), or 10 microg/kg/min dobutamine and 500 microg/kg/min of the beta(1)-adrenoceptor antagonist esmolol (Dob/Esmolol/Shock) for 6 h. Hemorrhagic shock was induced thereafter (mean arterial pressure, 35 mm Hg for 90 min). Animals were resuscitated with shed blood and Ringer's. In addition, the HO pathway was blocked after dobutamine pretreatment with 10 micromol/kg tin-mesoporphyrin-IX (Dob/SnMP/Shock) or animals received 100 mg/kg of the carbon monoxide donor dichloromethane (DCM/Shock). MEASUREMENTS Hepatocellular metabolism and liver blood flow were measured by plasma disappearance rate of indocyanine green (PDR(ICG)) as a sensitive marker of liver function. MAIN RESULTS Pretreatment with dobutamine induced HO-1 in pericentral hepatocytes and improved PDR(ICG) (Vehicle/Shock: 11.7 +/- 8.12%/min vs. Dob/Shock: 19.7 +/- 2.46%/min, p = 0.006). Blockade of the HO pathway after preconditioning and the combined pretreatment with dobutamine and esmolol decreased PDR(ICG) (Dob/SnMP/Shock: 12.6 +/- 4.24%/min, p = 0.011; Dob/Esmolol/Shock: 10.2 +/- 4.34%/min, p = 0.008). Pretreatment with a carbon monoxide donor improved PDR(ICG) (DCM/Shock: 18 +/- 3.19%/min, p = 0.022) compared with Vehicle/Shock. CONCLUSIONS These results suggest a beta(1)-adrenoceptor-dependent hepatic up-regulation of HO-1 and a better maintained hepatocellular function after hemorrhagic shock in animals pretreated with dobutamine. The improved hepatocellular function may be in part mediated by carbon monoxide because of up-regulation of HO-1. Pretreatment with dobutamine might be a potential means of pharmacologic preconditioning before ischemia-reperfusion of the liver.

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