Properties of the guinea-pig lung platelet-activating factor receptor encoded by the cloned cDNA

Platelet-activating factor (PAF) is a naturally occurring phospholipid possessing proinflammatory and shock-inducing activities. Although PAF exerts these functions via specific receptors, the molecular structures of the receptor has not been clarified. We have isolated a cDNA coding for PAF receptor through expression cloning. The PAF receptor expressed in Xenopus laevis oocytes and COS-7 cells showed pharmacological properties consistent with those in previous reports. Sequence analysis revealed that PAF receptor belongs to the superfamily of G-protein-coupled receptors.