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[Peripheral neuropathy in two children with mitochondrial encephalomyopathy]
Rinsho Shinkeigaku = Clinical Neurology
|July 1, 1991
Summary
Children with mitochondrial encephalomyopathy (MEM) rarely develop peripheral neuropathy (PN). This study found evidence of PN in two pediatric MEM patients, suggesting mitochondrial dysfunction impacts both nerve and muscle.
Area of Science:
- Neurology
- Mitochondrial Diseases
- Peripheral Neuropathy
Background:
- Peripheral neuropathy (PN) is infrequently observed in pediatric patients diagnosed with mitochondrial encephalomyopathy (MEM).
- Previous reports primarily focused on adult cases, leaving a gap in understanding pediatric manifestations.
Observation:
- Two pediatric patients, a 3-year-old girl and an 8-year-old boy, with MEM presented with clinical and electrophysiological evidence of PN.
- Muscle biopsies revealed reduced cytochrome c oxidase (CCO) activity, despite the absence of ragged red fibers.
- Histopathological examination of the sural nerve in one patient showed reduced large myelinated fibers and mitochondrial accumulation in Schwann cells.
Findings:
- Both patients exhibited reduced peripheral nerve conduction velocities with normal evoked potential amplitudes.
- Biochemical assays confirmed a deficiency in CCO activity in both muscle and, in one case, peripheral nerve tissue.
- The findings indicate a shared pathological mechanism involving mitochondrial dysfunction in both muscle and peripheral nerve tissues.
Implications:
- These findings support a common pathogenesis for peripheral neuropathy and mitochondrial encephalomyopathy stemming from mitochondrial dysfunction.
- This research highlights the importance of investigating peripheral nerve involvement in pediatric MEM cases.
- Understanding this link can lead to improved diagnostic approaches and potential therapeutic strategies for affected children.