Two compounds, ICI 58,301 (3-acetamido-6-methyl-8-n
-propyl-s-triazolo[4,3-a]pyrazine) and ICI 63,197 (2-amino-6-methyl-5-oxo-4-n
-propyl-4,5,-dihydro-s-triazolo[l,5-a]pyrimidine) facilitate the recovery of guinea pigs which have been subjected to anaphylactic shock. ICI 63,197 also reduces the amount of histamine released from the isolated lungs of sensitized guinea pigs after injection of antigen, partially inhibits passive cutaneous anaphylaxis in guinea pigs, protects mice from anaphylactic shock, and inhibits passive cutaneous anaphylaxis in rats sensitized with homologous reaginic or heterologous antisera. ICI 58,301 is not active in these conditions. Both compounds are potent inhibitors of 3′:5′-cyclic AMP phosphodiesterase and it is speculated that this property is associated with their anti-anaphylactic effects.
Request reprints from: Dr. G. E. Davies, Imperial Chemical Industries Ltd., Pharmaceuticals Division, Alderley Park, Macclesfield, Cheshire (UK)
Received: April 11, 1973
Published online: July 23, 2009
Number of Print Pages : 12
International Archives of Allergy and Immunology
Vol. 45, No. 3, Year 1973 (Cover Date: 1973)
Journal Editor: Valenta R. (Vienna)
ISSN: 1018-2438 (Print), eISSN: 1423-0097 (Online)
For additional information: http://www.karger.com/IAA
Copyright / Drug Dosage
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