The effect of altering endogenous leucocyte cyclic AMP levels on phagocytosis and lysosomal enzyme release was studied in vivo. Acute pleural exudates were produced in rats using either calcium pyrophosphate dihydrate crystals or rat serum. Despite marked increases in leucocyte cyclic AMP concentration produced by injection of dibutyryl cyclic AMP and theophylline, there was no reduction in crystal phagocytosis or in enzyme discharge.
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Deporter et al. (1977) studied this question.
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