Cryopreserved PBMCs can be used for the analysis of mitochondrial respiration and serve as a diagnostic tool for mitochondrial diseases
Language English Country United States Media print-electronic
Document type Journal Article
PubMed
39645068
DOI
10.1016/j.ab.2024.115745
PII: S0003-2697(24)00289-6
Knihovny.cz E-resources
- Keywords
- Cryopreservation, Diagnostics, Glycolysis, Mitochondrial diseases, OXPHOS, Oxidative phosphorylation, PBMC, Peripheral blood mononuclear cells, Respirometry,
- MeSH
- Cell Respiration MeSH
- Child MeSH
- Infant MeSH
- Cryopreservation * MeSH
- Leukocytes, Mononuclear * metabolism MeSH
- Humans MeSH
- Mitochondrial Diseases * diagnosis genetics metabolism MeSH
- Mitochondria * metabolism MeSH
- Adolescent MeSH
- Oxidative Phosphorylation MeSH
- Child, Preschool MeSH
- Check Tag
- Child MeSH
- Infant MeSH
- Humans MeSH
- Adolescent MeSH
- Male MeSH
- Child, Preschool MeSH
- Female MeSH
- Publication type
- Journal Article MeSH
Mitochondrial diseases are severe, inherited metabolic disorders that affect the paediatric population. They affect the functioning of mitochondrial oxidative phosphorylation (OXPHOS) apparatus either directly or indirectly. Since mutations in mtDNA are responsible for only 25 % of paediatric cases and next-generation sequencing does not always provide a conclusive diagnosis, the biochemical approach still represents a valuable tool in diagnostics. Mitochondrial defects can be identified in tissue biopsies (muscle or skin). However, they also often manifest in peripheral blood cells. We developed a protocol for isolation and cryopreservation of peripheral blood mononuclear cells (PBMCs) from 5 ml of children's blood using Ficoll centrifugation which can be utilised for subsequent functional measurements on thawed samples. Furthermore, we evaluated the diagnostic utility of the optimised high-resolution oxygraphy protocol using digitonin-permeabilized cryopreserved PBMCs on 47 samples from patients with confirmed or suspected mitochondrial disease. Overall, the diagnosis was confirmed in 72 % of cases, while the analysis of cryopreserved PBMCs provided a false negative outcome in 13 % of cases. Our study demonstrates a sensitive, fast, and non-invasive approach for the diagnostics of various types of mitochondrial disorders, especially those of nuclear genetic origin manifesting in paediatric patients.
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