Abstract
We report the immunoaffinity isolation of bradykinin B2 receptors in a tyrosine-phosphorylated state from WI-38 human lung fibroblasts. We generated six monoclonal antibodies directed against B2 bradykinin receptor biologic activity mediating prostaglandin E2 production in WI-38. These cells express a repertoire of bradykinin receptor affinity forms with closely correlated biologic activity and [3H]bradykinin binding. Some of the monoclonal antibodies selectively recognize intermediate-affinity (Kd = 5.6 nM) or low-affinity (Kd = 42 nM) receptor forms, whereas others recognize epitopes common to both. The monoclonal antibodies block bradykinin binding and biologic activity. Immunoaffinity chromatography on an immobilized monoclonal antibody of intermediate- plus low-affinity specificity yields WI-38 B2 receptors with intact [3H]bradykinin binding activity and a molecular mass of 78 kDa. The same band is immunoblotted by all the monoclonal antibodies, indicating a similar molecular mass for receptor forms of different affinity. Anti-phosphotyrosine antibodies demonstrate that the receptors are tyrosine phosphorylated, with implications for receptor function and regulation. Genistein completely inhibits bradykinin-mediated prostaglandin E2 production with an IC50 of 8 microM, indicating that tyrosine kinase activity is critical for the signal transduction leading to arachidonic acid release.
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