Belal 2022 Biomedicines

From Bioblast
Publications in the MiPMap
Belal S, Goudenège D, Bocca C, Dumont F, Chao De La Barca JM, Desquiret-Dumas V, Gueguen N, Geffroy G, Benyahia R, Kane S, Khiati S, Bris C, Aranyi T, Stockholm D, Inisan A, Renaud A, Barth M, Simard G, Reynier P, Letournel F, Lenaers G, Bonneau D, Chevrollier A, Procaccio V (2022) Glutamate-induced deregulation of krebs cycle in mitochondrial encephalopathy lactic acidosis syndrome stroke-like episodes (MELAS) syndrome is alleviated by ketone body exposure.

Β» Biomedicines 10:1665. PMID: 35884972 Open Access Β»O2k-brief

Belal Sophie, Goudenege David, Bocca Cinzia, Dumont Florent, Chao De La Barca Juan Manuel, Desquiret-Dumas Valerie, Gueguen Naig, Geffroy Guillaume, Benyahia Rayane, Kane Selma, Khiati Salim, Bris Celine, Aranyi Tamas, Stockholm Daniel, Inisan Aurore, Renaud Aurelie, Barth Magalie, Simard Gilles, Reynier Pascal, Letournel Franck, Lenaers Guy, Bonneau Dominique, Chevrollier Arnaud, Procaccio Vincent (2022) Biomedicines

Abstract: The development of mitochondrial medicine has been severely impeded by a lack of effective therapies.

To better understand Mitochondrial Encephalopathy Lactic Acidosis Syndrome Stroke-like episodes (MELAS) syndrome, neuronal cybrid cells carrying different mutation loads of the m.3243A > G mitochondrial DNA variant were analysed using a multi-omic approach.

Specific metabolomic signatures revealed that the glutamate pathway was significantly increased in MELAS cells with a direct correlation between glutamate concentration and the m.3243A > G heteroplasmy level. Transcriptomic analysis in mutant cells further revealed alterations in specific gene clusters, including those of the glutamate, gamma-aminobutyric acid pathways, and tricarboxylic acid (TCA) cycle. These results were supported by post-mortem brain tissue analysis from a MELAS patient, confirming the glutamate dysregulation. Exposure of MELAS cells to ketone bodies significantly reduced the glutamate level and improved mitochondrial functions, reducing the accumulation of several intermediate metabolites of the TCA cycle and alleviating the NADH-redox imbalance.

Thus, a multi-omic integrated approach to MELAS cells revealed glutamate as a promising disease biomarker, while also indicating that a ketogenic diet should be tested in MELAS patients. β€’ Keywords: MELAS syndrome, NADH/NAD imbalance, Glutamate, Ketone body treatment, Mitochondrial diseases, mtDNA, Multi-omics, Tricarboxylic acid cycle β€’ Bioblast editor: Plangger M β€’ O2k-Network Lab: FR Angers Gueguen N

Labels: MiParea: Respiration, mtDNA;mt-genetics, mt-Medicine 

Stress:Mitochondrial disease  Organism: Human  Tissue;cell: Neuroblastoma  Preparation: Intact cells 

Coupling state: LEAK, ROUTINE, ET 

HRR: Oxygraph-2k 

2022-09, O2k-brief 

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