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Rapid secretion of intracellularly pre-stored interleukin-8 from rabbit platelets upon activation

S B Su1, N Mukaida, K Matsushima

  • 1Department of Pharmacology, Cancer Research Institute, Kanazawa University, Ishikawa, Japan.

Journal of Leukocyte Biology
|March 1, 1996
PubMed

Insights

Rabbit platelets store and rapidly secrete biologically active interleukin-8 (IL-8) upon activation. This suggests platelets play a key role in rabbit inflammatory responses by releasing chemokines like IL-8.

Area of Science:

  • Immunology
  • Hematology
  • Cell Biology

Background:

  • Platelets are known for their role in hemostasis.
  • Emerging evidence suggests platelets also participate in immune responses.
  • The specific role of platelets in rabbit inflammatory processes requires further elucidation.

Purpose of the Study:

  • To investigate the presence and secretion of interleukin-8 (IL-8) in rabbit platelets.
  • To determine the biological activity of secreted IL-8 from rabbit platelets.
  • To understand the potential role of platelets in rabbit inflammatory reactions.

Main Methods:

  • Immunohistochemistry and Western blotting to detect intracellular IL-8 in rabbit platelets.
  • Thrombin stimulation to induce platelet activation and IL-8 secretion.
  • Assessment of neutrophil chemotactic activity of secreted IL-8.
  • Neutralization assays using specific monoclonal antibodies.

Main Results:

  • Substantial intracellular interleukin-8 (IL-8) was detected in freshly isolated rabbit platelets.
  • Thrombin stimulation led to rapid IL-8 secretion, with maximal levels at 10 minutes.
  • Secreted IL-8 demonstrated significant neutrophil chemotactic activity.
  • This activity was specifically neutralized by an anti-rabbit IL-8 antibody.

Conclusions:

  • Rabbit platelets store biologically active IL-8 intracellularly.
  • Platelets rapidly secrete IL-8 upon activation, influencing neutrophil migration.
  • Platelets are likely key mediators in rabbit inflammatory responses through cytokine and chemokine production, including IL-8.

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