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Monsorno K, Ginggen K, Ivanov A, Buckinx A, Lalive AL, Tchenio A, Benson S, Vendrell M, D'Alessandro A, Beule D, Pellerin L, Mameli M, Paolicelli RC. Loss of microglial MCT4 leads to defective synaptic pruning and anxiety-like behavior in mice. Nat Commun 2023; 14:5749. [PMID: 37717033 PMCID: PMC10505217 DOI: 10.1038/s41467-023-41502-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2022] [Accepted: 09/07/2023] [Indexed: 09/18/2023] Open
Abstract
Microglia, the innate immune cells of the central nervous system, actively participate in brain development by supporting neuronal maturation and refining synaptic connections. These cells are emerging as highly metabolically flexible, able to oxidize different energetic substrates to meet their energy demand. Lactate is particularly abundant in the brain, but whether microglia use it as a metabolic fuel has been poorly explored. Here we show that microglia can import lactate, and this is coupled with increased lysosomal acidification. In vitro, loss of the monocarboxylate transporter MCT4 in microglia prevents lactate-induced lysosomal modulation and leads to defective cargo degradation. Microglial depletion of MCT4 in vivo leads to impaired synaptic pruning, associated with increased excitation in hippocampal neurons, enhanced AMPA/GABA ratio, vulnerability to seizures and anxiety-like phenotype. Overall, these findings show that selective disruption of the MCT4 transporter in microglia is sufficient to alter synapse refinement and to induce defects in mouse brain development and adult behavior.
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Affiliation(s)
- Katia Monsorno
- University of Lausanne, Department of Biomedical Sciences, Lausanne, Switzerland
| | - Kyllian Ginggen
- University of Lausanne, Department of Biomedical Sciences, Lausanne, Switzerland
| | - Andranik Ivanov
- Core Unit Bioinformatics, Berlin Institute of Health, Charité-Universitätsmedizin Berlin, Berlin, Germany
| | - An Buckinx
- University of Lausanne, Department of Biomedical Sciences, Lausanne, Switzerland
| | - Arnaud L Lalive
- University of Lausanne, Department of Fundamental Neurosciences, Lausanne, Switzerland
| | - Anna Tchenio
- University of Lausanne, Department of Fundamental Neurosciences, Lausanne, Switzerland
| | - Sam Benson
- University of Edinburgh, Centre for Inflammation Research, Edinburgh, United Kingdom
| | - Marc Vendrell
- University of Edinburgh, Centre for Inflammation Research, Edinburgh, United Kingdom
| | - Angelo D'Alessandro
- University of Colorado, Anschutz Medical Campus, Department of Biochemistry and Molecular Genetics, Denver, CO, USA
| | - Dieter Beule
- Core Unit Bioinformatics, Berlin Institute of Health, Charité-Universitätsmedizin Berlin, Berlin, Germany
| | - Luc Pellerin
- Inserm U1313, University of Poitiers and CHU of Poitiers, Poitiers Cedex, France
| | - Manuel Mameli
- University of Lausanne, Department of Fundamental Neurosciences, Lausanne, Switzerland
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