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An Endothelial Planar Cell Model for Imaging Immunological Synapse Dynamics
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Separate endocytic pathways regulate IL-5 receptor internalization and signaling.

Jonathan T Lei1, Margarita Martinez-Moczygemba

  • 1Biology of Inflammation Center, Baylor College of Medicine, Houston, TX 77030-3411, USA.

Journal of Leukocyte Biology
|May 31, 2008
PubMed
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Interleukin-5 receptors (IL-5Rs) internalize via clathrin and lipid raft pathways in human eosinophils. This endocytosis is crucial for IL-5 signaling, regulating receptor degradation and cellular response.

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Area of Science:

  • Immunology
  • Cell Biology
  • Molecular Biology

Background:

  • Eosinophils rely on Interleukin-5 (IL-5) for critical functions.
  • Previous work identified JAK2-dependent proteasomal degradation of the shared beta common (betac) receptor subunit.
  • Spatial distribution and endocytic regulation of IL-5 receptors (IL-5Rs) in human eosinophils were previously uncharacterized.

Purpose of the Study:

  • To investigate the endocytic pathways and intracellular trafficking of IL-5Rs in human eosinophils.
  • To determine the role of IL-5R endocytosis in regulating IL-5 signaling.
  • To elucidate the spatial compartmentalization of IL-5Rs during signaling.

Main Methods:

  • Deconvolution microscopy
  • Biochemical assays
  • Immunofluorescence staining
  • Co-immunoprecipitation

Main Results:

  • IL-5Rs internalize via both clathrin- and lipid raft-dependent endocytosis.
  • Internalized IL-5Rs colocalize with transferrin and cholera toxin-B vesicles.
  • Degraded IL-5Rs are found in soluble, non-raft fractions, while internalized receptors are in both clathrin- and lipid raft-positive vesicles.
  • Inhibition of endocytosis blocks IL-5R signaling complex formation.

Conclusions:

  • IL-5Rs traffic into distinct plasma membrane compartments.
  • IL-5R endocytosis is essential for optimal IL-5-induced signaling.
  • Endocytosis of IL-5Rs plays a dual role in regulating signaling, both positively and negatively.