Abstract
Background
Classical (or isolated) methylmalonic acidemia (MMA) is a heterogeneous inborn error of metabolism most typically caused by mutations in the vitamin B12-dependent enzyme methylmalonyl-CoA mutase (MUT). With the improved survival of individuals with MMA, chronic kidney disease has become recognized as part of the disorder. The precise description of renal pathology in MMA remains uncertain.
Methods
Light microscopy, histochemical, and ultrastructural studies were performed on the native kidney obtained from a 19-year-old patient with mut MMA who developed end stage renal disease and underwent a combined liver–kidney transplantation.
Results
The light microscopy study of the renal parenchyma in the MMA kidney revealed extensive interstitial fibrosis, chronic inflammation, and tubular atrophy. Intact proximal tubules were distinguished by the widespread formation of large, circular, pale mitochondria with diminished cristae. Histochemical preparations showed a reduction of cytochrome c oxidase and NADH activities, and the electron microscopy analysis demonstrated loss of cytochrome c enzyme activity in these enlarged mitochondria.
Conclusions
Our results demonstrate that the renal pathology of MMA is characterized by megamitochondria formation in the proximal tubules in concert with electron transport chain dysfunction. Our findings suggest therapies that target mitochondrial function as a treatment for the chronic kidney disease of MMA.
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Acknowledgments
We thank Ms. Lena Ellezian for cryosectioning and electron microscopy processing at Department of Pathology at BIDMC. We also thank Ms. Andrea Calhoun at the Electron Microscopy Core Laboratory of BIDMC for her assistance with the COX–electron microscopy study.
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Supplemental Fig 1
The chromatogram tracings depict heterozygous changes in the either exon 3 or exon 11 in the MUT gene from a control (top) compared to the patient (below). The nucleotide change and corresponding amino acid substitution are listed as well. (PDF 82 kb)
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Zsengellér, Z.K., Aljinovic, N., Teot, L.A. et al. Methylmalonic acidemia: A megamitochondrial disorder affecting the kidney. Pediatr Nephrol 29, 2139–2146 (2014). https://doi.org/10.1007/s00467-014-2847-y
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DOI: https://doi.org/10.1007/s00467-014-2847-y