title: Cystathionine Levels in Patients With Huntington Disease.
abstract: BACKGROUND
  Recently a profound depletion of cystathionine γ-lyase (CSE), the principal enzyme involved in the generation of cysteine from cystathionine, was shown in Huntington disease (HD) patients and several transgenic HD mouse models. We therefore hypothesized that blood and urine cystathionine levels may be increased in HD patients and that this increase might correlate with disease progression.
  
  
  METHODS
  We measured concentrations of cystathionine as well as 22 other amino acids in fasting plasma and 24-h urine samples of nine early-stage HD patients and nine age, sex, and body mass index matched controls.
  
  
  RESULTS
  There were no significant differences in the plasma or urine concentrations of cystathionine or any other amino acid between HD patients and controls.
  
  
  CONCLUSIONS
  We found no evidence for changes in plasma or urine concentrations of cystathionine in early-stage HD patients. Therefore, cystathionine levels are unlikely to be useful as a state biomarker in HD.
authors.affiliation: Department of Neurology, Leiden University Medical Centre, Leiden, the Netherlands.
authors.forename: N A
authors.initials: NA
authors.lastname: Aziz
authors.affiliation: Department of Clinical Chemistry and Laboratory Medicine, Unit of Metabolic Diseases, Leiden University Medical Centre, The Netherlands.
authors.forename: W
authors.initials: W
authors.lastname: Onkenhout
authors.affiliation: Department of Clinical Chemistry and Laboratory Medicine, Unit of Metabolic Diseases, Leiden University Medical Centre, The Netherlands.
authors.forename: H J
authors.initials: HJ
authors.lastname: Kerstens
authors.affiliation: Department of Neurology, Leiden University Medical Centre, Leiden, the Netherlands.
authors.forename: Raymund A C
authors.initials: RA
authors.lastname: Roos