Administration of Exogenous Melatonin After the Onset of Systemic Inflammation Is Hardly Beneficial

AbstractMelatonin improves survival and functional impairment including hemolysis, thrombocytopenia, and hypotension when administered in a prophylactic manner or early after initiation of sepsis or endotoxemia. In the present study, melatonin was given not before first symptoms of systemic inflammation became manifest. Lipopolysaccharide was infused at a rate of 0.5  mg/kg × h to induce systemic inflammation in male Wistar rats. Melatonin (single dose 3 mg/kg × 15 min) was intravenously administered 180 and 270 min after starting of the lipopolysaccharide infusion. Systemic and vital parameters (e.g., systemic blood pressure and breathing rate) as well as blood and plasma parameters (acid-base parameters; electrolytes; parameters of tissue injury such as glucose concentration, l...

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