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Thiazolo-pyrones as potential anti-inflammatory agents.

Ting Tian1, Ke Liu1, Zuoyan Kang1

  • 1Key Laboratory of Preclinical Study for New Drugs of Gansu Province, Research Unit of Peptide Science, Chinese Academy of Medical Sciences, 2019RU066, Institute of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Lanzhou University, Lanzhou, 730000, PR China.

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New thiazolo-pyrones show potent anti-inflammatory effects. Compound 3n effectively reduced nitric oxide (NO) and prostaglandin E2 (PGE2) production in vitro and in vivo, offering promise for treating inflammatory disorders.

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Area of Science:

  • Medicinal Chemistry
  • Pharmacology
  • Organic Synthesis

Background:

  • Inflammation is a complex biological response implicated in numerous diseases.
  • Novel therapeutic agents targeting key inflammatory mediators are continuously sought.
  • Thiazolo-pyrone scaffolds represent an underexplored area for anti-inflammatory drug discovery.

Purpose of the Study:

  • To design and synthesize novel chiral thiazolo-pyrones.
  • To evaluate the in vitro and in vivo anti-inflammatory potential of these compounds.
  • To elucidate the molecular mechanisms underlying the observed anti-inflammatory activity.

Main Methods:

  • Synthesis and characterization of chiral thiazolo-pyrone derivatives.
  • In vitro assays: inhibition of nitric oxide (NO), prostaglandin E2 (PGE2), TNF-α, and IL-6 production in LPS-stimulated RAW264.7 cells.
  • In vivo assay: xylene-induced mouse ear edema model.
  • Mechanism studies: Western blot analysis of iNOS, COX-2, and MAPK signaling pathway components.

Main Results:

  • Most synthesized thiazolo-pyrones demonstrated significant inhibition of LPS-induced NO release with low cytotoxicity.
  • Compound 3n exhibited the most potent anti-inflammatory activity, reducing NO production by 95.2% and inhibiting PGE2 production (IC50 cellular: 16.06 μM; IC50 enzyme: 0.72 μM).
  • Compound 3n also suppressed TNF-α and IL-6, down-regulated iNOS and COX-2 expression, and inhibited MAPK signaling (p38, ERK, JNK phosphorylation).
  • In vivo, compound 3n effectively reduced ear edema in a dose-dependent manner.

Conclusions:

  • Chiral thiazolo-pyrones, particularly compound 3n, possess significant anti-inflammatory properties.
  • Compound 3n acts by inhibiting key enzymes (iNOS, COX-2) and modulating the MAPK signaling pathway.
  • These findings highlight the therapeutic potential of thiazolo-pyrones as novel anti-inflammatory agents for conditions associated with excessive NO and COX-2 production.