Methylmalonic Acid Impairs Cell Respiration and Glutamate Uptake in C6 Rat Glioma Cells: Implications for Methylmalonic Acidemia

Costa, Renata Torres da; Santos, Marcella Bacelar dos; Alberto-Silva, Carlos; Carrettiero, Daniel Carneiro; Ribeiro, César Augusto João

doi:10.1007/s10571-022-01236-1

Cited by 4 publications

(1 citation statement)

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“…MMA is a toxic metabolite that impacts mitochondrial activity by impairing cell respiration and glutamate uptake (Melo et al, 2012). The consequence of the latter is to increase the concentration of extracellular glutamate (Costa et al, 2022). In Tbx1 +/- brain, in addition to increased MMA, we found several metabolites related to the glutamate pathway and to mitochondrial activity to be dysregulated, including reduced levels of glutamine and adenosine and increased levels of glutamate and inosine.…”

Section: Discussionmentioning

confidence: 99%

Tbx1 haploinsufficiency causes brain metabolic and behavioral anomalies in adult mice which are corrected by vitamin B12 treatment

Caterino,

Paris,

Torromino

et al. 2024

Preprint

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Introduction The brain-related phenotypes observed in 22q11.2 deletion syndrome (22q11.2DS) are highly variable and their origin is poorly understood. Changes in brain metabolism may cause or contribute to the phenotypes, given that many of the deleted genes (approx. 10%) are implicated in metabolic processes, but this is currently unknown. It is clearly important to address this knowledge gap, but in humans, the primary material required for studying brain metabolism is inaccessible. For this reason, we sought to address the issue using two mouse models of 22q11.2DS. Methods We used three independent approaches to investigate brain metabolism in young adult mice, namely, mass spectrometry, nuclear magnetic resonance spectroscopy and transcriptomics. We selected to study primarily Tbx1 single gene mutants because it is the primary candidate disease gene. We then confirmed key findings in the multi-gene deletion mutant Df1/+. Results We found that Tbx1 mutants have alterations of specific brain metabolites, including methylmalonic acid, which is highly brain-toxic, as well as a more general metabolomic imbalance. We provide transcriptomic evidence of an interaction genotype-vB12 treatment, and behavioural evidence of a response to vB12 treatment, which rescued some of the behavioural anomaly observed in Tbx1 mutants. We conclude that Tbx1 haploinsufficiency causes extensive brain metabolic anomalies, which are partially responsive to vB12 treatment. We suggest that alterations of glutamine-glutamate metabolism and fatty acid metabolism are key components of the metabolic phenotype in these mutants.

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Section: Discussionmentioning

confidence: 99%