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ORIGINAL RESEARCH article

Front. Immunol.

Sec. Inflammation

Volume 16 - 2025 | doi: 10.3389/fimmu.2025.1644783

This article is part of the Research TopicNeuroinflammation: Mechanisms and Therapeutic InterventionsView all 13 articles

MicroRNA-132 regulates quinolinic acid production in the brain during LPS-induced neuroinflammation

Provisionally accepted
  • 1Faculty of Medicine, Laval University, Québec, Canada
  • 2Centre de recherche du CHU de Quebec-Universite Laval Site CHUL, Québec City, Canada
  • 3Centre Hospitalier Universitaire de Lille, Lille, France
  • 4Centre d'Infection et d'Immunite de Lille, Lille, France
  • 5Institut Pasteur de Lille, Lille, France

The final, formatted version of the article will be published soon.

The kynurenine pathway (KP) plays a major role in neuroinflammation by converting the amino acid tryptophan into a variety of neuroactive products, including neurotoxic quinolinic acid (QUIN). The gene expression regulatory role of microRNAs in neuroinflammation is well documented; however, their impact on KP in the brain remains unexplored. Methods: In this study, we investigated whether the neuroimmune miR-132/212 cluster regulates one or more members of the KP during lipopolysaccharide (LPS)-induced neuroinflammation in vivo in mice and in vitro in BV-2 microglial cells.In wildtype mice, we demonstrated that a subtoxic dose of LPS triggers a significant neuroinflammatory response with upregulation of KP enzymes, particularly kynurenine 3-monooxygenase (KMO), a key enzyme in QUIN synthesis, leading to elevated brain levels of this neurotoxic metabolite. Interestingly, KMO expression and activity remained elevated in miR-132/212 knockout mice after post-inflammation resolution. In vitro experiments using BV-2 microglial cells showed that miR-132 overexpression led to downregulation of KMO expression and enzyme activity and reduced QUIN levels without altering the microglial activation status. Conclusion: Collectively, these findings suggest that the miR-132/212 cluster functions as a novel modulator of KP metabolism during LPS-induced inflammation, and acts as a potential therapeutic target for controlling neurotoxic QUIN accumulation in neuroinflammatory conditions.

Keywords: MicroRNA-132, kynurenine pathway, Kynurenine 3-Monooxygenase, Quinolinic Acid, Neuroinflammation

Received: 10 Jun 2025; Accepted: 06 Aug 2025.

Copyright: © 2025 KEZAI, Bediane, Hennart, Allorge, Marion and Hebert. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

* Correspondence: Sebastien Hebert, Faculty of Medicine, Laval University, Québec, Canada

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