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The present study examined whether adenosine agonists influence the occurrence of giant migrating contractions (GMCs) induced by glycerol enema (65%, 2 ml/kg) in rats. Catheter pressure transducers were used to measure the colonic luminal manometric alterations. The adenosine A1 agonists (2S)-N6-(2-endo-norbornyl)adenosine ((S)-ENBA) (10 micrograms/kg, i.v.) and N6-cyclohexyladenosine (30 micrograms/kg, i.v.) abolished the GMCs, whereas the adenosine A2 agonist 2-[p-(2-carboxyethyl)phenethylamino]-5'-N-ethylcarboxamidoadenosin e (CGS 21680) (30-300 micrograms/kg, i.v.) failed to influence the GMCs. The suppressive action of (S)-ENBA on the GMCs was entirely counteracted by the peripheral adenosine antagonist 8-(p-sulfophenyl)theophylline (10 mg/kg, i.v.). The present observations suggest that the adenosine A1 agonist suppresses the GMCs via peripheral adenosine receptors.

Susceptibility to Adenosine Agonists of Giant Migrating Contractions Induced by Glycerol Enema in Anesthetized Rats