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Related Experiment Videos

Bleomycin binding sites on alveolar macrophages.

E M Denholm1, S H Phan

  • 1Division of Hematology, Albany Medical College, New York 12208.

Journal of Leukocyte Biology
|December 1, 1990
PubMed
Summary

Bleomycin stimulates alveolar macrophages to release growth factors. Researchers found specific bleomycin binding sites on these macrophages, suggesting a mechanism for bleomycin's effects on lung cells.

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Area of Science:

  • Pulmonary Medicine
  • Cell Biology
  • Pharmacology

Background:

  • Bleomycin is known to stimulate alveolar macrophage secretion of fibroblast growth factors and monocyte chemotactic factors.
  • The mechanism by which bleomycin exerts these effects on macrophages is not fully understood.

Purpose of the Study:

  • To investigate the presence and characteristics of bleomycin binding sites on rat alveolar macrophages.
  • To determine if these binding sites mediate bleomycin-induced secretion of growth factors.

Main Methods:

  • Rat alveolar macrophages were obtained via bronchoalveolar lavage.
  • Bleomycin binding assays were performed to identify and quantify binding sites.
  • Dose-response curves were used to assess the ED50 for bleomycin-stimulated factor secretion.

Main Results:

  • Alveolar macrophages possess specific, saturable, and reversible bleomycin binding sites.
  • Two types of sites were identified: high-affinity (6.7 x 10^4 sites/macrophage, Kd = 528 nM) and low-affinity (2.2 x 10^6 sites/macrophage, Kd = 65 microM).
  • The Kd of high-affinity sites closely matched the ED50 for bleomycin-stimulated factor secretion.

Conclusions:

  • Bleomycin interacts with specific binding sites on alveolar macrophages.
  • These binding sites likely mediate the bleomycin-induced secretion of fibroblast growth and monocyte chemotactic factors.
  • This finding provides a potential mechanism for bleomycin's effects on lung inflammation and fibrosis.

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