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Related Experiment Videos

Structure and function of membrane IL-1.

H U Beuscher1, H R Colten

  • 1Edward Mallinckrodt Department of Pediatrics, Washington University School of Medicine, Children's Hospital, St. Louis, Missouri.

Molecular Immunology
|November 1, 1988
PubMed
Summary
This summary is machine-generated.

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New findings reveal that the precursor of interleukin-1 alpha (IL-1 alpha) is phosphorylated and membrane-bound, suggesting this modification is crucial for intracellular transport and release of mature IL-1.

Area of Science:

  • Immunology
  • Cell Biology
  • Molecular Biology

Background:

  • Interleukin-1 (IL-1) alpha and beta are initially translated as precursor polypeptides.
  • Mature IL-1 (17.5 kDa) lacks signal sequences for transmembrane transport.
  • The mechanism of IL-1 precursor processing and release remains unclear.

Purpose of the Study:

  • Investigate membrane-associated IL-1 alpha polypeptides.
  • Explore post-synthetic modifications of the IL-1 alpha precursor for intracellular transport.
  • Determine the role of modifications in IL-1 release.

Main Methods:

  • Utilized a specific antiserum for murine IL-1 alpha.
  • Performed cell surface iodination on endotoxin-stimulated murine macrophages.
  • Analyzed IL-1 precursor phosphorylation using 32PO4 incorporation.

Related Experiment Videos

  • Assessed membrane association and degradation of IL-1 alpha.

    • Main Results:

    • Detected IL-1 molecules similar in size to the IL-1 alpha precursor (33 kDa) on stimulated macrophage surfaces.
    • Membrane-bound IL-1 alpha was degraded by serine esterase activity into smaller peptides (16-18 kDa).
    • Endotoxin-stimulated macrophages, but not unstimulated cells, phosphorylated the IL-1 alpha precursor.
    • The phosphate label was resistant to hydroxylamine and alkaline phosphatase; released IL-1 was not phosphorylated.
    • Approximately 10% of phosphorylated IL-1 alpha precursor was membrane-bound, associated with lysosomal vesicles.

    Conclusions:

    • Post-synthetic modification of pro-IL-1 alpha is essential for its intracellular transport.
    • Membrane-bound, phosphorylated IL-1 alpha may be a prerequisite for IL-1 release.
    • These findings support a model for membrane-associated IL-1 (mIL-1) expression and release.