title: Respiratory-chain enzyme activities in isolated mitochondria of lymphocytes from untreated Parkinson's disease patients. Grupo-Centro de Trastornos del Movimiento.
abstract: We studied respiratory-chain enzyme activities in lymphocyte mitochondria from 36 untreated Parkinson's disease (PD) patients and in 30 age- and sex-matched healthy controls. The respiratory-chain enzyme activities did not differ significantly between patients and controls. Moreover, no patient showed respiratory-chain enzyme levels below normal range. Values for activities of complexes in the PD group did not correlate with age at onset, duration, scores of the Unified Parkinson's Disease Rating scales, or Hoehn and Yahr staging. These results suggest that the presence of defects of respiratory-chain complexes could depend on methodologic aspects, and that determinations of respiratory-chain enzymes in cell homogenates are not generally appropriate for evaluating abnormal mitochondrial dysfunction, especially when the amount of the specific enzyme is relatively low, as is the case of blood cells. In addition, the method of measuring complex I activity is critical for evaluating the results. In conclusion, our finding of normal mitochondrial function in lymphocyte mitochondria suggests that this tissue cannot be used to develop a diagnostic test for PD.
authors.affiliation: Department of Biochemistry, Hospital Universitario Doce de Octubre, Madrid, Spain.
authors.forename: M A
authors.initials: MA
authors.lastname: Martín
authors.forename: J A
authors.initials: JA
authors.lastname: Molina
authors.forename: F J
authors.initials: FJ
authors.lastname: Jiménez-Jiménez
authors.forename: J
authors.initials: J
authors.lastname: Benito-León
authors.forename: M
authors.initials: M
authors.lastname: Ortí-Pareja
authors.forename: Y
authors.initials: Y
authors.lastname: Campos
authors.forename: J
authors.initials: J
authors.lastname: Arenas
mesh_terms: D002950:Citrate (si)-Synthase / Q000378:metabolism; D042963:Electron Transport Complex II; D014450:Electron Transport Complex III / Q000378:metabolism; D003576:Electron Transport Complex IV / Q000378:metabolism; D005260:Female; D006801:Humans; D008214:Lymphocytes / Q000201:enzymology*; D008297:Male; D008875:Middle Aged; D008928:Mitochondria / Q000201:enzymology*; D009097:Multienzyme Complexes / Q000378:metabolism; D016660:NAD(P)H Dehydrogenase (Quinone) / Q000378:metabolism; D010088:Oxidoreductases / Q000378:metabolism; D010101:Oxygen Consumption; D010300:Parkinson Disease / Q000201:enzymology*; D012016:Reference Values; D013385:Succinate Dehydrogenase / Q000378:metabolism
chemical_list: D009097:Multienzyme Complexes; D010088:Oxidoreductases; D042963:Electron Transport Complex II; D013385:Succinate Dehydrogenase; D016660:NAD(P)H Dehydrogenase (Quinone); D003576:Electron Transport Complex IV; D002950:Citrate (si)-Synthase; D014450:Electron Transport Complex III