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Related Experiment Videos

Interleukin 1 is processed and released during apoptosis.

K A Hogquist1, M A Nett, E R Unanue

  • 1Department of Medicine, Washington University School of Medicine, St. Louis, MO 63110.

Proceedings of the National Academy of Sciences of the United States of America
|October 1, 1991
PubMed
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Cell injury, not the classic secretory pathway, releases Interleukin-1 (IL-1). Necrosis releases varied IL-1 forms, while apoptosis ensures efficient IL-1 processing and release.

Area of Science:

  • Immunology
  • Cell Biology
  • Molecular Biology

Background:

  • Interleukin-1 (IL-1) alpha and beta are synthesized as inactive pro-molecules.
  • Mature IL-1 is released from monocytes and macrophages as a 17-kDa active form.
  • IL-1 release does not follow the typical secretory pathway and lacks signal peptides.

Purpose of the Study:

  • To investigate the mechanisms of IL-1 release from cells.
  • To determine the role of cell injury in IL-1 release and processing.
  • To differentiate IL-1 release patterns following necrosis versus apoptosis.

Main Methods:

  • Induction of cell injury (necrosis and apoptosis) in monocytes and macrophages.
  • Analysis of Interleukin-1 alpha and beta forms in cell culture supernatants.

Related Experiment Videos

  • Comparison of IL-1 processing and release under different cell death conditions.

    • Main Results:

    • Cell injury efficiently induces the release of Interleukin-1 (IL-1).
    • Necrotic cell injury results in the release of both processed and unprocessed IL-1 alpha, but only inactive pro-IL-1 beta.
    • Apoptotic cell death leads to efficient intracellular processing and release of both IL-1 alpha and IL-1 beta.

    Conclusions:

    • Cell injury is a significant physiological trigger for IL-1 release.
    • The specific type of cell injury (necrosis vs. apoptosis) dictates the form and processing of released IL-1.
    • Understanding IL-1 release mechanisms is crucial for inflammatory and immune responses.