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Area of Science:

  • Immunology
  • Cell Biology
  • Molecular Biology

Background:

  • Gp96 is an endoplasmic reticulum chaperone crucial for protein folding.
  • Its absence in Crohn's disease (CD) patients' macrophages correlates with a loss of immune tolerance.
  • Gp96 is essential for Toll-like receptor (TLR) function.

Purpose of the Study:

  • To investigate the impact of Gp96 knockdown on TLR function in macrophages.
  • To elucidate the role of Gp96 in TLR4 signaling pathways and downstream effects.

Main Methods:

  • Gp96 knockdown in cell lines and a monocyte/macrophage specific knock-out mouse model (LysMCre).
  • Analysis of TLR2 and TLR4 expression levels.
  • Assessment of lipopolysaccharide (LPS)-induced NF-κB activation and pro-inflammatory cytokine expression.
  • Evaluation of ERK and p38 kinase phosphorylation and CSF1R activation.

Main Results:

  • Gp96 knockdown decreased but did not abolish TLR2 and TLR4 expression in cell lines.
  • In LysMCre mice, TLR4 was abolished, while TLR2 remained present.
  • LPS-induced NF-κB activation and TLR4 upregulation occurred even without Gp96.
  • Pro-inflammatory cytokine expression was reduced, not abolished, in Gp96-deficient macrophages.
  • Reduced phosphorylation of ERK and p38 kinases and impaired CSF1R activation were observed.

Conclusions:

  • Gp96 plays a significant role in TLR4 signaling, but other chaperones may compensate for its absence.
  • Loss of Gp96 impairs downstream signaling cascades, including NF-κB and pro-inflammatory cytokine production.
  • Gp96 deficiency affects multiple signaling pathways beyond TLRs, impacting ERK, p38, and CSF1R activation.