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Receptor mediated endocytosis and intracellular fate of interleukin 1

R Solari1, N Smithers, N Kennard

  • 1Division of Cellular and Molecular Science, Glaxo Group Research, Greenford, Middlesex, U.K.

Biochemical Pharmacology
|January 13, 1994
PubMed

Insights

Interleukin 1 (IL1) internalization by EL4 cells occurs slowly via receptor-mediated endocytosis. Internalized IL1 accumulates undegraded, potentially targeting the nucleus, influencing cellular responses.

Area of Science:

  • Immunology
  • Cell Biology
  • Molecular Biology

Background:

  • Interleukin 1 (IL1) is a key cytokine in immune responses.
  • EL4 murine thymoma cells express the Type I IL1 receptor.
  • The IL1 receptor exhibits high and low affinity binding states.

Purpose of the Study:

  • Investigate receptor-mediated endocytosis of IL1 by EL4 cells.
  • Characterize the kinetics and fate of internalized IL1.
  • Explore the biological significance of IL1 internalization and nuclear targeting.

Main Methods:

  • Utilized EL4 cell line for studying IL1 endocytosis.
  • Measured IL1 binding affinities (Kd) to its receptor.
  • Analyzed receptor turnover rates in different conditions.
  • Assessed intracellular accumulation and localization of internalized IL1.

Main Results:

  • IL1 receptor displays high (65 pM) and low (14.5 nM) affinity binding.
  • Distinct receptor turnover rates observed for high and low affinity states.
  • IL1 internalization is a slow process compared to rapid cellular responses.
  • Internalized IL1 accumulates undegraded and associates with detergent-insoluble fractions.

Conclusions:

  • IL1 internalization is a distinct pathway from rapid signaling.
  • Accumulation of undegraded IL1 suggests potential nuclear transport.
  • Nuclear targeting of IL1 may play a role in regulating cellular functions.

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