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Inflammation Regulation by Bacterial Molecular Patterns.

Svetlana V Guryanova1,2, Anastasiya Kataeva3

  • 1Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry of Russian Academy of Sciences, Ministry of Science and Higher Education of the Russian Federation, 117997 Moscow, Russia.

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Summary

Bacterial components like lipopolysaccharide (LPS) and glucosaminylmuramyl dipeptide (GMDP) trigger early innate immune responses and later anti-inflammatory gene expression. Understanding this balance is key for treating inflammatory diseases.

Keywords:
A20ATF3GMDPLPSNOD2TLR4TNF-αinnate immune memoryinnate immunitylipopolysaccharidemuramyl peptidetolerance

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Area of Science:

  • Immunology
  • Molecular Biology
  • Microbiology

Background:

  • Innate immunity utilizes molecular patterns to induce cellular responses and immune memory, involving epigenetic modifications.
  • Immunological memory can manifest as heightened inflammation or tolerance, with tolerance being crucial for immune system stability.
  • Mechanisms of immune tolerance, particularly the formation of non-response to pro-inflammatory stimuli, require further elucidation for treating inflammatory diseases.

Purpose of the Study:

  • To investigate the dynamic gene expression of inflammation suppressors A20 and ATF3.
  • To analyze these suppressors against the backdrop of innate immune receptor (TLR4, NOD2) and pro-inflammatory cytokine (TNF-α) expression.
  • To evaluate the regulatory effects of bacterial bioregulators lipopolysaccharide (LPS) and glucosaminylmuramyl dipeptide (GMDP) on inflammation.

Main Methods:

  • In vitro studies using human peripheral blood mononuclear cells and in vivo studies in mice.
  • Administration of TLR4 and NOD2 agonists (LPS and GMDP).
  • Assessment of gene expression using Reverse Transcription Polymerase Chain Reaction (RT-PCR).

Main Results:

  • Early expression of innate immune receptors (TLR4, NOD2) and TNF-α was observed in response to LPS and GMDP, both in vitro and in vivo.
  • Later expression of inflammation-suppressing genes, A20 and ATF3, was detected.
  • Prior exposure to LPS and muramyl peptides can modulate host defense against acute inflammation.

Conclusions:

  • Bacterial bioregulators LPS and GMDP, alongside pro-inflammatory factors, induce the expression of inflammation-suppressing genes.
  • New data reveal dynamic changes in deubiquitinase A20 and transcription factor ATF3 during inflammatory responses to bacterial fragments.
  • Findings necessitate consideration of these dual pro- and anti-inflammatory effects when analyzing LPS/GMDP studies and developing therapeutics.