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Detection of Neu1 Sialidase Activity in Regulating TOLL-like Receptor Activation
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Proteolytic processing regulates Toll-like receptor 3 stability and endosomal localization.

Rongsu Qi1, Divyendu Singh, C Cheng Kao

  • 1Department of Molecular and Cellular Biochemistry, Indiana University, Bloomington, Indiana 47401, USA.

The Journal of Biological Chemistry
|August 7, 2012
PubMed
Summary

Toll-like receptor 3 (TLR3) undergoes proteolytic processing in endosomes, forming fragments with increased stability. This cleavage is not essential for poly(I:C) signaling but may modulate responses to viral RNAs.

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Area of Science:

  • Immunology
  • Molecular Biology
  • Cell Biology

Background:

  • Toll-like receptors (TLRs) are crucial innate immune sensors recognizing pathogen nucleic acids.
  • TLR9 activation requires proteolytic processing, but TLR3 processing remains unclear.
  • Endosomal TLRs initiate signaling cascades leading to cytokine production.

Purpose of the Study:

  • To investigate the proteolytic processing of human Toll-like receptor 3 (TLR3).
  • To determine the role of Unc93b1 and specific TLR3 domains in processing.
  • To assess the functional consequences of TLR3 cleavage on signaling and stability.

Main Methods:

  • HEK293T cell culture and transfection.
  • Western blotting to detect TLR3 fragments.
  • Treatment with cathepsin inhibitors.
  • Site-directed mutagenesis of TLR3.
  • Analysis of TLR3 localization and degradation pathways.

Main Results:

  • Human TLR3 is proteolytically processed into two fragments within endosomes.
  • Unc93b1 facilitates TLR3 transport and processing.
  • Cleavage occurs within Loop1 of the TLR3 ectodomain.
  • Proteolytic processing is not required for poly(I:C) response but affects viral RNA recognition.
  • Cleaved TLR3 fragments exhibit enhanced stability compared to full-length TLR3.
  • Inhibition of cleavage increases TLR3 degradation via lysosomal pathways.

Conclusions:

  • TLR3 undergoes endosomal proteolytic processing mediated by Unc93b1.
  • Cleavage enhances TLR3 stability and influences its response to different nucleic acids.
  • TLR3 processing represents a regulatory mechanism in innate immunity.