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. 1991 Jun;103(2):1520–1524. doi: 10.1111/j.1476-5381.1991.tb09820.x

The effect of cetirizine on antigen-dependent leucopenia in the guinea-pig.

A J Coyle 1, J Lefort 1, B B Vargaftig 1
PMCID: PMC1908338  PMID: 1679361

Abstract

1. Intravenous administration of ovalbumin (1 mg kg-1) to guinea-pigs that had previously been injected with 3.5 x 10(9) platelets from actively sensitized animals induced an approximately 40% decrease in the number of circulating leucocytes 30-60 min later, whereas the number of platelets was not affected. 2. In contrast, there was no change in the leucocyte number following antigen challenge of guinea-pigs that had received platelets from non-immunised animals. 3. This platelet-dependent leucopenia was inhibited by prior treatment of the recipient animal with cetirizine (10-30 mg kg-1, i.v.). Terfenadine (50 mg kg-1, p.o.) and mepyramine (2 mg kg-1, i.v.) were completely inactive in this respect. All doses of anti-histamines were used at concentrations which completely inhibited the bronchoconstriction to an i.v. injection of 5 micrograms kg-1 of histamine. 4. The site of action of cetirizine is most likely to be the platelet as leucopenia induced by the neutrophil agonists leukotriene B4 (LTB4) (30 ng kg-1) and platelet activating factor (PAF) (30 ng kg-1) were not modified by cetirizine treatment. 5. In these experiments, we failed to support a role for lipoxygenase products as mediators of the platelet-dependent leucopenia, as the selective lipoxygenase inhibitor BWA4C (50 mg kg-1, p.o.) was ineffective. 6. Our present results confirm and extend previous data demonstrating that antigen stimulated platelets can induce leucopenia in non-immunised animals and this can be inhibited by the anti-allergic agent, cetirizine, by an action which is probably unrelated to its anti-histamine properties.(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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