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. 1993 Feb;108(2):412–417. doi: 10.1111/j.1476-5381.1993.tb12818.x

Pharmacological differentiation by pertussis toxin of the in vivo acute responses to fMLP and PAF in guinea-pig lungs.

C D Arreto 1, M F Bureau 1, A Imaizumi 1, B B Vargaftig 1
PMCID: PMC1908009  PMID: 8448592

Abstract

1. The effects of pertussis toxin on the N-formyl-L-methionyl-L-leucyl-L-phenylalanine (fMLP) and platelet-activating factor (PAF)-induced variations in pulmonary capillary albumin exchanges, blood volume, leucocyte or platelet sequestration were studied in the guinea-pig, by use of radioactive tracers. The effects of pertussis toxin on pulmonary insufflation pressure were studied in parallel. 2. The i.v. administration of fMLP and PAF to the guinea-pig was followed by bronchoconstriction, increased lung capillary albumin exchanges (vasopermeability) sequestration of leucocytes, leucopenia and reduction of blood volume (vasoconstriction). PAF also induced platelet sequestration in lungs and thrombocytopenia. 3. Pertussis toxin (10 micrograms kg-1, i.v., 72 h before the experiment) prevented all the studied fMLP-induced effects, but failed to modify PAF-induced bronchoconstriction, lung vasoconstriction, platelet sequestration, thrombocytopenia and the increased capillary vasopermeability. In the same conditions the lung leucocyte sequestration was not significantly affected when leucopenia was partially reduced. 4. It is suggested that the effects of fMLP, but not those of PAF, involve a Gi-like protein.

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Selected References

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