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Combinatorial Chemistry & High Throughput Screening

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ISSN (Print): 1386-2073
ISSN (Online): 1875-5402

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Research Article

Toll-Like Receptor Signaling in the Pathogenesis of Chronic Dacryocystitis: Implication of c-FOS Transcription Factor and its Downstream Effector Chemokine Genes CCL2, CCL4, CXCL3, CXCR4 with a Shift of the M1/M2 Macrophage Phenotype

Author(s): Noha Ahmed Edris, Basma Emad Aboulhoda*, Shimaa Saad El-Din, Amina Mahmoud Fouad, Emad Albadawi, Laila Ahmed Rashed and Kareem Bakr Elessawy

Volume 26, Issue 3, 2023

Published on: 21 July, 2022

Page: [489 - 497] Pages: 9

DOI: 10.2174/1386207325666220509150457

Price: $65

Abstract

Introduction: TLRs are fundamental elements in the orchestration of the innate immune system. These receptors seem to be responsible for the inflammation and fibrosis in chronic dacryocystitis. The aim of the present study was to investigate the role of the toll-Like receptors (TLR2 and TLR4) signaling pathway and its downstream effector chemokine genes in the pathogenesis of chronic dacryocystitis.

Methods: This study was conducted on 20 patients diagnosed with chronic dacryocystitis and underwent external dacryocystorhinostomy. Estimation of gene expression of TLR2, TLR4, CCL2, CCL4, CXCL3, CXCR4, and c-FOS genes in the lacrimal sac tissues was performed together with the assessment of the inflammatory markers TNFα, IL-1β, IFN-γ, and IL-22. Histopathological examination of the lacrimal sac walls using hematoxylin and eosin (H&E) stain, in addition to immunohistochemical staining of the CD68 and CD163 macrophage markers, was also performed.

Results: Our results showed that TLR2, TLR4, and c-FOS gene expressions were significantly increased in the chronic dacryocystitis group with a subsequent increase in their downstream effector chemokine genes CCL2, CCL4, and CXCL3. This up-regulation of genes was accompanied by macrophage shift of polarization toward the M1 pro-inflammatory phenotype (increased CD68 and decreased CD163 expression), leading to increased levels of the pro-inflammatory cytokines (TNF- α, IL-1β and IFN-γ) and decreased anti-inflammatory marker IL-22 with chronic dacryocystitis.

Conclusion: It is essential to fine-tune TLR activation through emerging therapeutic approaches. Targeting TLR signaling at the level of receptors or downstream adaptor molecules represents a new challenge for treating chronic dacryocystitis.

Keywords: Toll-Like receptors, macrophage polarization, pro-inflammatory cytokines, chemokines, chronic dacryocystitis, epipjora.

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