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JL Bueb, M Mousli, C Bronner, B Rouot and Y Landry
Laboratoire de Neuroimmunopharmacologie, Universite Louis Pasteur- Strasbourg I, Illkirch, France.
The peptide hormones bradykinin and kallidin (Lys-bradykinin), as well as their analogues [des-Arg9]-bradykinin, a selective B1 agonist, [des- Arg9,Leu8]-bradykinin, a selective B1 antagonist, and [Thi5,8,D-Phe7]- bradykinin and D-Arg0-[Hyp3,D-Phe7]-bradykinin, two selective B2 antagonists, induced rapid histamine release from purified rat peritoneal mast cells. In contrast, the N-terminal fragment bradykinin- (1-5) was inactive. These peptides also activate the GTPase activity of GTP-binding proteins (G proteins) (Go/Gi) purified from calf brain, with an order of potency identical to that observed on mast cells, [Thi5,8,D-Phe7]-bradykinin much greater than kallidin greater than bradykinin greater than D-Arg0-[Hyp3,D-Phe7]-bradykinin greater than [des-Arg9]-bradykinin greater than [des-Arg9,Leu8]-bradykinin greater than bradykinin-(1-5). This correlation suggested that G proteins are the targets of kinins in mast cells. Accordingly, the concomitant increase in inositol trisphosphates and release of histamine elicited by kinins were inhibited by pertussis toxin pretreatment of mast cells. The inhibitory effect of benzalkonium chloride showed that the G proteins involved belong to the Gi type. GTPase activity was measured in the supernatant of homogenized mast cells but not in the membranous fraction. This activity was stimulated by kinins and by the venom peptide mastoparan. The potency of peptides was similar to that observed with purified bovine G proteins. Sodium dodecyl sulfate-gel electrophoresis of mast cell supernatant revealed pertussis toxin- induced ADP-ribosylation of two proteins, in the Mr 41,000 and 40,000 range, i.e., similar to purified alpha-subunits of Gi1 and Gi2 or Gi3 subtypes. The data support the proposal that bradykinin and analogues act like mastoparan, substance P, and compound 48/80, interacting first with sialic acid residues of the cell surface and then with Gi-like proteins, inducing phospholipase C activation and intracellular calcium mobilization.
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