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Receptor-mediated endocytosis and nuclear transport of human interleukin 1 alpha

S Grenfell1, N Smithers, K Miller

  • 1Department of Human Metabolism and Clinical Biochemistry, University of Sheffield Medical School, U.K.

The Biochemical Journal
|December 15, 1989
PubMed

Insights

Interleukin-1 alpha (IL-1 alpha) is endocytosed by cells and moves to the nucleus, where it accumulates intact. This nuclear accumulation of IL-1 alpha may be key to its biological functions.

Area of Science:

  • Cell Biology
  • Immunology
  • Molecular Biology

Background:

  • Interleukin-1 (IL-1) is a key cytokine involved in immune responses and inflammation.
  • The precise intracellular trafficking and nuclear localization mechanisms of IL-1 are not fully understood.

Purpose of the Study:

  • To investigate the cellular uptake and nuclear translocation of Interleukin-1 alpha (IL-1 alpha).
  • To characterize the binding kinetics and characteristics of IL-1 alpha within the nucleus.

Main Methods:

  • Utilized 125I-labelled IL-1 alpha to track its binding and internalization in EL4 6.1 cells.
  • Employed two-dimensional polyacrylamide-gel electrophoresis to assess the integrity of internalized IL-1 alpha.
  • Performed binding studies on isolated cell nuclei.

Main Results:

  • Demonstrated specific and saturable binding of 125I-IL-1 alpha to EL4 6.1 cell surface receptors.
  • Showed that internalized 125I-IL-1 alpha is translocated to the nucleus and remains intact.
  • Identified high-affinity binding sites for IL-1 alpha on isolated nuclei.

Conclusions:

  • Receptor-mediated endocytosis of IL-1 alpha leads to its accumulation within the cell nucleus.
  • Nuclear localization of IL-1 alpha may represent a significant mechanism for its biological activity.

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