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• W2049202496 startingPage "584" @default.
• W2049202496 abstract "Systemic hypoxia following surgical injury modulates cytokine and catecholamine responses. Endotoxin tolerance develops after pretreatment of animals with sublethal endotoxin doses and is characterized by a reduced inflammatory cytokine response to subsequent endotoxin challenges. The administration of endotoxin also attenuates ischemic injury of rat myocardial tissue following hypoxia, a phenomenon described as cross-tolerance. The objectives of this study were: 1) to determine whether endotoxin evokes a cross-tolerance to systemic hypoxia in rats; and 2) to estimate circulatory and pulmonary performance in rats with systemic hypoxia after endotoxin pretreatment.Seventy-two hours before the experiment, Wistar rats were given an intraperitoneal injection of endotoxin at a dose of 10 microg/kg. Polyethylene catheters were inserted into the femoral vein for infusion, and into the femoral artery for blood sampling and blood pressure monitoring. Systemic hypoxia was achieved by continuous inhalation of a modified gas mixture (9% oxygen+ 91% N2) for 4 hours. Plasma TNF-alpha and IL-6 were measured by ELISA, and norepinephrine (NE) by HPLC.The hypoxic rats that were pretreated with saline showed a significant decrease in mean arterial blood and base excess, as compared with the normoxic rats. Endotoxin pretreatment prevented the drop in mean arterial pressure during hypoxia and reduced the decrease in base excess. Hypoxic conditions markedly stimulated TNF-alpha and IL-6 release and increased NE levels, compared to the normoxic rats. Pretreatment with endotoxin suppressed the hypoxia-induced cytokine production as well as attenuating the increase in NE levelsIn this rat hypoxia model, endotoxin pretreatment ameliorated the hypoxia-induced inflammatory response as well as suppressing the effects on arterial oxygenation, anaerobic metabolism and NE stimulation." @default.
• W2049202496 created "2016-06-24" @default.
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• W2049202496 date "2003-03-01" @default.
• W2049202496 modified "2023-10-02" @default.
• W2049202496 title "Sublethal Endotoxin Administration Evokes Super-Resistance to Systemic Hypoxia in Rats" @default.
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• W2049202496 doi "https://doi.org/10.1097/01.ta.0000060180.29719.57" @default.
• W2049202496 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/12634542" @default.
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