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Related Experiment Videos

Interaction between corticosteroid binding globulin and activated leukocytes in vitro.

G L Hammond1, C L Smith, C M Underhill

  • 1MRC Group in Neonatal Health and Development, University of Western Ontario, London, Canada.

Biochemical and Biophysical Research Communications
|October 15, 1990
PubMed
Summary

Human corticosteroid binding globulin (CBG) interacts with activated granulocytes, leading to its cleavage and reduced steroid binding. This interaction on neutrophil surfaces may enhance glucocorticoid delivery during inflammation.

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Area of Science:

  • Biochemistry
  • Immunology
  • Cell Biology

Background:

  • Corticosteroid binding globulin (CBG) is a key plasma protein regulating glucocorticoid bioavailability.
  • Activated leukocytes, particularly granulocytes, play critical roles in inflammatory processes.

Purpose of the Study:

  • To investigate the interaction between human corticosteroid binding globulin (CBG) and activated leukocytes.
  • To elucidate the mechanism and consequences of CBG interaction with immune cells.

Main Methods:

  • Incubation of purified human CBG with activated granulocyte populations.
  • Analysis of CBG proteolytic cleavage and steroid binding activity.
  • Comparison of degradation products with those generated by neutrophil elastase.

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Main Results:

  • CBG interaction is specific to activated granulocytes.
  • Proteolytic cleavage of CBG occurs upon cell interaction, significantly reducing steroid binding.
  • The process involves surface interaction, not cellular internalization of CBG.
  • Degradation products resemble those from incubation with neutrophil elastase.

Conclusions:

  • CBG directly interacts with activated neutrophils on their surface.
  • This interaction involves cleavage by neutrophil elastase, reducing CBG's steroid binding capacity.
  • The findings suggest a mechanism for targeted glucocorticoid delivery to inflammatory sites.