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TGFβ in endosomal signaling

Sarah McLean1, Gianni M Di Guglielmo2

  • 1Department of Anatomy and Cell Biology, Western University, London, Ontario, Canada; Department of Physiology and Pharmacology, Western University, London, Ontario, Canada.

Methods in Enzymology
|January 1, 2014
PubMed

Insights

Transforming growth factor beta (TGFβ) receptor trafficking impacts cell signaling. This chapter details methods for isolating membrane rafts and tracking TGFβ receptor movement to understand signal transduction outcomes.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • The transforming growth factor beta (TGFβ) signaling pathway regulates crucial cellular processes like apoptosis and differentiation.
  • Endosomal trafficking of TGFβ receptors significantly influences signal transduction outcomes.
  • Receptor internalization via clathrin-mediated endocytosis promotes signaling, whereas raft-mediated endocytosis targets receptors for degradation.

Purpose of the Study:

  • To explore strategies for isolating membrane rafts.
  • To present techniques for tracking cell-surface TGFβ receptor trafficking.
  • To provide functional readouts for assessing TGFβ signal transduction.

Main Methods:

  • Membrane raft isolation techniques.
  • Cell-surface receptor trafficking assays.
  • Functional assays for TGFβ signal transduction.

Main Results:

  • Identification of TGFβ receptor-binding proteins influencing endocytosis and trafficking.
  • Demonstration of distinct signaling outcomes based on internalization pathways.
  • Establishment of methods to correlate receptor trafficking with signal output.

Conclusions:

  • TGFβ receptor trafficking is a critical determinant of signaling.
  • Specific methods are presented for studying receptor-ligand interactions and trafficking.
  • Understanding these mechanisms provides insights into TGFβ pathway regulation.
Keywords:
Immunofluorescence microscopyMembrane raftsReceptor internalizationSubcellular fractionationTransforming growth factor beta

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