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The Preventive Effect of Nicotinic Acid on Carbon Tetrachloride Toxicity in Sheep

Den preventiva effekten av nikotinsyra vid koltetrakloridförgiftning hos får

Abstract

The blood glucose response following the intravenous injection of butyric acid, 2.5 mM/kg, was studied in normal and carbon tetrachloride poisoned sheep. In normal sheep there was a rapid increase in blood glucose. Carbon tetrachloride greatly reduced the glucose response. In animals pretreated with nicotinic acid, 50 mg/kg, on the day before carbon tetrachloride administration, the glucose response was not altered. When a larger dose of nicotinic acid, 100 mg/kg, was given simultaneously with carbon tetrachloride, the glucose response was reduced more than after only carbon tetrachloride. Nicotinic acid alone at the dose of 100 mg/kg reduced the glucose rise somewhat more than carbon tetrachloride. There was a good agreement between the glucose rise following butyric acid and the glycogen content of the liver. It thus seemed clear that butyric acid has a glycogenolytic effect when given intravenously. Carbon tetrachloride caused severe necrosis and fatty changes in the liver. These pathological changes were reduced by pretreating the animals with 50 mg/kg of nicotinic acid. The larger dose of nicotinic acid, 100 mg/kg, caused a diffuse degeneration of the liver cells and a complete disappearence of glycogen. All liver injuries were followed by a rise in serum OCT.

Sammanfattning

Blodglykosstegringen efter intravenös injektion av smörsyra, 2,5 mM/kg, studerades hos normala och koltetrakloridförgiftade får. Hos normala får följdes smörsyrainjektionen av en snabb blodglykosstegring. Efter intraruminal tillförsel av koltetraklorid var glykossvaret avsevärt reducerat. Om djuren behandlades med nikotinsyra, 50 mg/kg, ett dygn före koltetrakloridtillförseln, påverkades inte den smör-syrainducerade hyperglykämien. När en större dos nikotinsyra, 100 mg/kg, gavs samtidigt som koltetraklorid, var glykosstegringen efter smörsyrainjektionen mycket liten. Resultatet blev detsamma om djuren behandlades med enbart nikotinsyra i en dos av 100 mg/kg. Glykogen-innehållet i levern från djur som behandlats med koltetraklorid och nikotinsyra, visade god överensstämmelse med blodglykosstegringen efter smörsyrainjektion. Det synes därför klart att smörsyra verkar glykogenolytiskt vid intravenös tillförsel. Koltetraklorid gav upphov till utbredda nekrotiska förändringar och en ökad fettinlagring i levern. Premedicinering med nikotinsyra, 50 mg/kg, reducerade dessa förändringar. I en större dos, 100 mg/kg, orsakade nikotinsyra en diffus levercellsdegeneration och en fullständig uttömning av glykogen. Alla leverskador orsakade en höjning av serum OCT.

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Luthman, J., Jonson, G. & Holtenius, P. The Preventive Effect of Nicotinic Acid on Carbon Tetrachloride Toxicity in Sheep. Acta Vet Scand 11, 254–267 (1970). https://doi.org/10.1186/BF03547986

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  • DOI: https://doi.org/10.1186/BF03547986