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Processing of C5a by human polymorphonuclear leukocytes

G Hetland1, P H Pfeifer, T E Hugli

  • 1Department of Immunology, The Scripps Research Institute, La Jolla, California 92037, USA.

Journal of Leukocyte Biology
|April 17, 1998
PubMed
Summary
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Neutrophils internalize complement C5a, which remains intact and functional inside the cell. Extracellular degradation is the primary pathway for C5a breakdown, supporting its role in neutrophil signaling.

Area of Science:

  • Immunology
  • Cell Biology

Background:

  • Neutrophils play a critical role in the innate immune response.
  • Complement component 5a (C5a) is a potent anaphylatoxin and chemoattractant that activates neutrophils via the C5a receptor (CD88).
  • The intracellular fate and functional integrity of internalized C5a are not fully understood.

Purpose of the Study:

  • To investigate the in vitro uptake, intracellular processing, and functional activity of human C5a by neutrophils.
  • To determine whether internalized C5a remains intact and biologically active within neutrophils.

Main Methods:

  • Neutrophils were incubated with 125I-labeled and unlabeled C5a.
  • Internalization, degradation, and localization of C5a were assessed using SDS-PAGE, autoradiography, and radioimmunoassay.
  • Functional activity of intracellular C5a was evaluated by its ability to induce neutrophil shape change and inhibition by specific antibodies.

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Main Results:

  • Neutrophils internalized C5a in a dose-dependent manner, with maximal uptake observed within 5 minutes.
  • Degradation products of C5a were predominantly found in the supernatant, while intact C5a was recovered from the cytosol.
  • Intracellular C5a retained its antigenic integrity and ability to induce neutrophil shape change, and its activity was blocked by anti-C5a or anti-CD88 antibodies.

Conclusions:

  • Human C5a is internalized by neutrophils and remains antigenically intact and functionally active within the cell.
  • Extracellular degradation is the primary mechanism for C5a breakdown, rather than intracellular degradation.
  • These findings support a model where internalized C5a can contribute to neutrophil activation and signaling.