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Advanced Imaging of Lung Homing Human Lymphocytes in an Experimental In Vivo Model of Allergic Inflammation Based on Light-sheet Microscopy
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RAGE and TLR4 differentially regulate airway hyperresponsiveness: Implications for COPD.

Venkata Sita Rama Raju Allam1, Alen Faiz2,3,4, Maggie Lam5

  • 1Graduate School of Health, Faculty of Health, The University of Technology Sydney, Ultimo, NSW, Australia.

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|August 18, 2020
PubMed
Summary
This summary is machine-generated.

Inhibition of the receptor for advanced glycation end products (RAGE) pathway, but not Toll-like receptor 4 (TLR4), may protect against airway neutrophilia and hyperresponsiveness in COPD. RAGE deficiency protected mice, while TLR4 deficiency worsened AHR.

Keywords:
airway hyperresponsivenesschronic obstructive pulmonary diseasecigarette smokereceptor for advanced glycation end productstoll-like receptor 4

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Area of Science:

  • Immunology
  • Pulmonology
  • Molecular Biology

Background:

  • The receptor for advanced glycation end products (RAGE) and Toll-like receptor 4 (TLR4) are implicated in Chronic Obstructive Pulmonary Disease (COPD).
  • These receptors share ligands and signaling pathways, but their combined role in COPD pathogenesis is unclear.
  • Investigating the interplay between RAGE and TLR4 is crucial for understanding COPD mechanisms.

Purpose of the Study:

  • To examine the impact of RAGE and/or TLR4 gene deficiency on COPD pathogenesis in a mouse model.
  • To determine if RAGE and TLR4 expression correlates with airway neutrophilia and airway hyperresponsiveness (AHR) in COPD patients.
  • To elucidate the specific roles of RAGE and TLR4 in COPD-related inflammation and AHR.

Main Methods:

  • Airway inflammation and AHR were measured in wild-type, RAGE-/-, TLR4-/-, and TLR4-/-RAGE-/- mice after cigarette smoke (CS) exposure.
  • Bronchial gene expression of AGER (RAGE) and TLR4 was analyzed in relation to smoking status and COPD in patients.
  • Correlation analysis was performed between receptor expression and clinical parameters like sputum neutrophil counts and AHR in COPD patients.

Main Results:

  • RAGE-/- mice showed protection against CS-induced neutrophilia and AHR.
  • TLR4-/- mice exhibited no protection against neutrophilia and exacerbated AHR.
  • TLR4-/-RAGE-/- mice were not protected against neutrophilia but showed partial protection against mediator release and AHR.
  • AGER expression correlated with higher sputum neutrophil counts and more severe AHR in COPD patients, while TLR4 expression did not.
  • Current smoking was associated with lower AGER and TLR4 expression, suggesting negative feedback.

Conclusions:

  • RAGE signaling inhibition, unlike TLR4, may offer protection against airway neutrophilia and AHR in COPD.
  • RAGE plays a significant role in driving neutrophilic inflammation and AHR in a mouse model of COPD.
  • Targeting RAGE could be a potential therapeutic strategy for managing COPD symptoms and progression.