Inhibition of eosinophil cyclic nucleotide PDE activity and opsonised zymosan-stimulated respiratory burst by 'type IV'-selective PDE inhibitors.


:1. The cyclic nucleotide phosphodiesterase (PDE) of guinea-pig eosinophils was partially characterized and the effects of selective inhibitors of PDE isoenzymes upon opsonized zymosan (OZ)-stimulated respiratory burst were studied. 2. PDE activity in eosinophil lysates appeared to be membrane-associated, displayed substrate specificity for adenosine 3':5' cyclic monophosphate (cyclic AMP) versus guanosine 3':5' cyclic monophosphate (cyclic GMP) and was insensitive to cyclic GMP or Ca2+ and calmodulin. 3. The non-selective PDE inhibitor, 3-isobutyl-1-methylxanthine caused a concentration-dependent inhibition of both OZ-stimulated hydrogen peroxide (H2O2) generation and cyclic AMP hydrolysis. The type IV-selective PDE inhibitors, rolipram and denbufylline, also inhibited H2O2 generation and cyclic AMP hydrolysis in a concentration-dependent manner whilst SK&F 94120 and Org 9935 (type III-selective) and zaprinast (type Ia or V-selective) were ineffective. 4. Dibutyryl cyclic AMP, a cell-permeable, non-hydrolysable analogue of cyclic AMP, caused a concentration-dependent inhibition of H2O2 generation stimulated by OZ. Dibutyryl cyclic GMP was ineffective. 5. It is concluded that eosinophil respiratory burst activity induced by OZ can be regulated by intracellular cyclic AMP and that the levels of cyclic AMP are controlled exclusively by a rolipram- and denbufylline-sensitive PDE isoenzyme that resembles a type IV species.


Br J Pharmacol


Dent G,Giembycz MA,Rabe KF,Barnes PJ




Has Abstract


1991-06-01 00:00:00












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  • The effects of indomethacin and eicosa-5,8,11,14-tetraynoic acid on the response of the rabbit portal vein to electrical stimulation.

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  • Enhanced sympathetic neurotransmission in the tail artery of 1,3-dipropyl-8-sulphophenylxanthine (DPSPX)-treated rats.

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    pub_type: 杂志文章


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    journal_title:British journal of pharmacology

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  • Neuroprotective activity of the mGluR5 antagonists MPEP and MTEP against acute excitotoxicity differs and does not reflect actions at mGluR5 receptors.

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    journal_title:British journal of pharmacology

    pub_type: 杂志文章


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    journal_title:British journal of pharmacology

    pub_type: 杂志文章


    authors: Fozard JR,Palfreyman MG,Robin M,Zreika M

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    journal_title:British journal of pharmacology

    pub_type: 杂志文章


    authors: Morikawa M,Inoue M,Tokumaru S,Kogo H

    更新日期:1995-08-01 00:00:00

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    journal_title:British journal of pharmacology

    pub_type: 杂志文章


    authors: Murnaghan MF

    更新日期:1975-01-01 00:00:00