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Regulation of the Unfolded Protein Response01:31

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Inositol-requiring kinase one or IRE1 is the most conserved eukaryotic unfolded protein response (UPR) receptor. It is a type I transmembrane protein kinase receptor with a distinctive site-specific RNase activity. As the binding mechanics of the misfolded proteins with the N-terminal domain of IRE-1 are unclear, three binding models — direct, indirect, and allosteric -- are proposed for receptor activation. Nevertheless, it is known that once a misfolded protein associates with IRE1, it...
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Hormonal Regulation

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Related Experiment Video

Updated: Feb 7, 2026

Isolation of Murine Peritoneal Macrophages to Carry Out Gene Expression Analysis Upon Toll-like Receptors Stimulation
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Platelets regulate leucocyte responses to Toll-like receptor stimulation.

Kathryn E Hally1,2, Anne C La Flamme1,2, Scott A Harding1,2,3

  • 1School of Biological Sciences Victoria University of Wellington Wellington New Zealand.

Clinical & Translational Immunology
|August 2, 2018
PubMed
Summary

Platelets modulate immune cell responses to Toll-like receptor (TLR) stimulation, acting as complex immunomodulators rather than solely pro-inflammatory agents. This platelet function may help reduce inflammation-mediated host damage.

Keywords:
Toll‐like receptorsleucocytesmonocytesneutrophilsplatelets

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Area of Science:

  • Immunology
  • Hematology
  • Cellular Biology

Background:

  • Platelets are key regulators of vascular thrombosis and inflammation.
  • Platelets express Toll-like receptors (TLRs) and interact with leukocytes.
  • Platelet-leukocyte interactions influence immune responses.

Purpose of the Study:

  • To investigate how platelets modulate peripheral blood mononuclear cell (PBMC) and granulocyte responses to TLR stimulation.
  • To examine platelet effects on leukocyte activation and cytokine production in vitro.
  • To determine if platelet modulation of TLR responses is agonist-specific.

Main Methods:

  • Peripheral blood mononuclear cells and granulocytes from 10 healthy volunteers were cultured alone or with platelets.
  • Cultures were stimulated with LPS (TLR4), Pam3CSK4 (TLR2/1), or FSL-1 (TLR2/6) agonists.
  • Neutrophil activation (CD66b), monocyte activation (HLA-DR), elastase production, and PBMC cytokine/chemokine profiles were analyzed.

Main Results:

  • Platelet coculture reduced neutrophil activation and granulocyte elastase secretion across most TLR agonist stimulations.
  • Platelets modulated monocyte HLA-DR expression, decreasing it with low-dose LPS.
  • Platelets altered PBMC cytokine/chemokine production in an agonist-specific manner, reducing some pro-inflammatory cytokines (e.g., TNF-α) and increasing others (e.g., IL-10).

Conclusions:

  • Platelets act as complex immunomodulators, not solely pro-inflammatory mediators.
  • Platelet effects on leukocyte responses to TLR stimulation are specific to the TLR agonist.
  • Platelets may play a role in dampening inflammation and reducing inflammation-mediated host damage.