IFN-GAMMA UP-REGULATES PLATELET-ACTIVATING-FACTOR RECEPTOR GENE-EXPRESSION IN HUMAN MONOCYTES

Human monocytes constitutively express the platelet-activating factor receptor (hPAF-R). In this report, we have investigated the modulation of hPAF-R by IFN-gamma. Treatment of monocytes with IFN-gamma caused a time- and concentration-dependent accumulation of hPAF-R mRNA. In co ntrast, IFN-alpha was inactive. The effect of IFN-gamma was rapid, evi dent by 1 h of stimulation and reaching a maximum after 2 h. The high level of hPAF-R mRNA was maintained for at least 24 h. Flow cytometry analysis revealed that monocytes treated with IFN-gamma had a two- to sixfold increase in PAF receptor expression at the cell surface, when compared with untreated cells. The increase in hPAF-R expression was a ssociated with an augmented response of IFN-gamma-treated cells to PAF in terms of cytosolic calcium ([Ca2+](i)) variations. The IFN gamma-d ependent accumulation of hPAF-R mRNA was not due to the stabilization of hPAF-R mRNA, as shown by unchanged hPAF-R mRNA t(1/2). Pretreatment of monocytes with actinomycin D, however, completely abrogated the ef fect of IFN-gamma, suggesting a transcriptional regulation. Moreover, the up-regulation of hPAF-R mRNA by IFN-gamma was independent of de no vo protein synthesis since cyclo-heximide, an inhibitor of protein syn thesis, did not affect this up-regulation. These studies are the first report showing that IFN-gamma regulates hPAF-R gene expression in hum an monocytes, by a mechanism suggesting transcriptional regulation. Th is may represent a prototypic example of regulation by lymphocyte-deri ved cytokines of lipid mediator receptors in myeloid cells, thus addin g a novel element in the interrelationship between immune and inflamma tory responses.