Abstract
Methylmalonic acidemia (MMAemia) is an inherited metabolic disorder of branched amino acid and odd-chain fatty acid metabolism, involving a defect in the conversion of methylmalonyl-coenzyme A to succinyl-coenzyme A. Systemic and neurological manifestations in this disease are thought to be associated with the accumulation of methylmalonate (MMA) in tissues and biological fluids with consequent impairment of energy metabolism and oxidative stress. In the present work we studied the effect of MMA and two other inhibitors of mitochondrial respiratory chain complex II (malonate and 3-nitropropionate) on the activity of lactate dehydrogenase (LDH) in tissue homogenates from adult rats. MMA potently inhibited LDH-catalyzed conversion of lactate to pyruvate in liver and brain homogenates as well as in a purified bovine heart LDH preparation. LDH was about one order of magnitude less sensitive to inhibition by MMA when catalyzing the conversion of pyruvate to lactate. Kinetic studies on the inhibition of brain LDH indicated that MMA inhibits this enzyme competitively with lactate as a substrate (K i=3.02±0.59 mM). Malonate and 3-nitropropionate also strongly inhibited LDH-catalyzed conversion of lactate to pyruvate in brain homogenates, while no inhibition was observed by succinate or propionate, when present in concentrations of up to 25 mM. We propose that inhibition of the lactate/pyruvate conversion by MMA contributes to lactate accumulation in blood, metabolic acidemia and inhibition of gluconeogenesis observed in patients with MMAemia. Moreover, the inhibition of LDH in the central nervous system may also impair the lactate shuttle between astrocytes and neurons, compromising neuronal energy metabolism.
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Acknowledgments
We thank Dr. Alicia Kowaltowski for discussions and Edilene S. Santos and Elisangela J. Gomes for technical support. This study was supported by Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP), Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) and National Institutes of Health (NIH) (grant number: 1 R03 HD047388–01A1). L.O.S and S.R.M. were supported by CNPq fellowships and E.N.M. by a FAPESP fellowship.
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S. R. Mirandola and E. N. Maciel contributed equally to this work.
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Saad, L.O., Mirandola, S.R., Maciel, E.N. et al. Lactate Dehydrogenase Activity is Inhibited by Methylmalonate in vitro . Neurochem Res 31, 541–548 (2006). https://doi.org/10.1007/s11064-006-9054-6
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DOI: https://doi.org/10.1007/s11064-006-9054-6