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Related Experiment Videos

High affinity bradykinin binding to human inflammatory cells

P Rajasekariah1, R S Warlow, R S Walls

  • 1Department of Immunology, Repatriation General Hospital, Concord, NSW, Australia.

Biochemistry and Molecular Biology International
|November 14, 1997
PubMed
Summary
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Human neutrophils and PBMCs exhibit specific bradykinin (BK) binding. Research confirms B2 receptor characteristics, with higher affinity for BK and Lys-BK compared to the B1 agonist [des-arg9]-BK.

Area of Science:

  • Immunology
  • Pharmacology
  • Cell Biology

Background:

  • Bradykinin (BK) is a peptide involved in various physiological processes.
  • Understanding BK receptor interactions is crucial for developing targeted therapies.

Purpose of the Study:

  • To investigate the specific binding of bradykinin (BK) and its analogs to receptors on human neutrophils and peripheral blood mononuclear cells (PBMCs).
  • To characterize the pharmacological properties of these BK binding sites.

Main Methods:

  • In vitro radioreceptor ligand binding assays using [125I]-BK.
  • Scatchard analysis to determine binding affinity (Kd) and receptor density (Bmax).
  • Competitive binding inhibition assays with various BK analogs.

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Main Results:

  • Specific BK binding was detected in both neutrophils and PBMCs.
  • Scatchard analysis revealed high-affinity binding sites for B1 and B2 agonists.
  • Competitive inhibition assays indicated pharmacologically defined B2 receptor characteristics, with higher affinity for BK and Lys-BK than for [des-arg9]-BK.

Conclusions:

  • Human neutrophils and PBMCs possess specific bradykinin binding sites.
  • The binding characteristics are consistent with the presence of B2 receptors, exhibiting higher affinity for BK and Lys-BK.