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The Effect of Cyclic Adenosine 3', 5' Monophosphate, Methyl Xanthines and Nicotinic Acid on Plasma Nonesterified Fatty Acids in Sheep

Effekten au cyklisk 3’, 5’ adenosin monofosforsyra, metylxantiner och nikotinsyra på plasmakoncentrationen au icke förestrade fettsyror hos får

Acta Veterinaria Scandinavica volume 12, pages 536–550 (1971)Cite this article

Summary

The intravenous injection of 3', 5' AMP, 10 mg/kg, caused an immediate rise in blood glucose in normal sheep. In sheep where liver glycogen was depleted by pretreatment with 100 mg/kg of nicotinic acid, the blood glucose response was greatly reduced. The glycogenolytic effect of 3', 5' AMP was thus easily demonstrated. The injection of 3', 5' AMP was followed by an immediate rise in NEFA, which was most pronounced in the pretreated animals. After the initial increase there was a fall in NEFA in both the normal and the pretreated animals. The role of hyperglycemia for the NEFA response to exogenous 3', 5' AMP was discussed. It seemed possible that hyperglycemia may modify the initial increase in NEFA. The later fall in NEFA was discussed as a complex response, which may be the result of the action of several hormones, which may be released by 3', 5' AMP injection. Nicotinic acid and pyridyl-3-acetic acid showed a potent antilipolytic activity. Nicotinic acid caused a rebound elevation of NEFA. No rebound was observed after pyridyl-3-acetic acid. Pyridyl-3-acetic acid, however, did not change NEFA when administered orally. Pyridyl-2-acetic acid had no antilipolytic effect. Of the methyl xanthines caffeine and theophylline showed about the same lipolytic activity. Theobromine was quite ineffective.

Sammanfattning

Intravenös injektion av cyklisk 3′, 5′ adenosin monofosforsyra (3′, 5′ AMP) i en dos av 10 mg/kg gav hos normala får upphov till en omedelbar blodglykosstegring. Hos får, där leverglykogenet reducerats genom förbehandling med nikotinsyra i en dos av 100 mg/kg, uteblev eller reducerades den initiala blodglykosstegringen. Den gly ko genoly tiska effekten av 3′, 5′ AMP kunde således verifieras. Injektionen av 3′, 5′ AMP följdes även av en initial ökning av NEFA, vilken var mest uttalad hos de förbehandlade djuren. Efter den initiala stegringen sjönk NEFA hos samtliga djur. Betydelsen av hyperglykämi för NEFA-svaret på exogent tillfört 3′, 5′ AMP diskuteras. Det synes möjligt att hyperglykämi kan modifiera den initiala stegringen av NEFA. Den senare sänkningen av NEFA diskuteras som ett komplext svar, som kan vara resultatet av effekten av ett flertal hormoner, som frisättes efter tillförsel av 3′, 5′ AMP. Nikotinsyra och pyridyl-3-ättiksyra hade kraftig antilipolytisk effekt. Nikotinsyra, men ej pyridyl-3-ättiksyra, orsakade en sekundär stegring av NEFA. Pyridyl-3-ättiksyra var helt ineffektiv efter oral tillförsel. Pyridyl-2-ättiksyra hade ingen antilipolytisk effekt. Av metylxantinerna hade koffein och teofyllin ungefär samma lipolytiska effekt. Teobromin hade ingen lipolytisk effekt.

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  1. Department of Medicine II, Royal Veterinary College, Stockholm, Sweden

    Jan Luthman & Gösta Jonson

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  1. Jan Luthman
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Luthman, J., Jonson, G. The Effect of Cyclic Adenosine 3', 5' Monophosphate, Methyl Xanthines and Nicotinic Acid on Plasma Nonesterified Fatty Acids in Sheep. Acta Vet Scand 12, 536–550 (1971). https://doi.org/10.1186/BF03547722

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Acta Veterinaria Scandinavica

ISSN: 1751-0147