title: Vitamin B-6 vitamers in human plasma and cerebrospinal fluid.
abstract: BACKGROUND
  Vitamin B-6 comprises a group of 6 interrelated vitamers and is essential for numerous physiologic processes, including brain functioning. Genetic disorders disrupting vitamin B-6 metabolism have severe clinical consequences.
  
  
  OBJECTIVE
  To adequately diagnose known and novel disorders in vitamin B-6 metabolism, a reference set is required containing information on all vitamin B-6 vitamers in plasma and cerebrospinal fluid (CSF).
  
  
  METHODS
  Concentrations of vitamin B-6 vitamers in the plasma and CSF of 533 adult subjects were measured by ultra high-performance liquid chromatography-tandem mass spectrometry.
  
  
  RESULTS
  The relative vitamin B-6 vitamer composition of plasma [pyridoxal phosphate (PLP) > pyridoxic acid (PA) > pyridoxal] differed from that of CSF (pyridoxal > PLP > PA > pyridoxamine). Sex influenced vitamin B-6 vitamer concentrations in plasma and CSF and should therefore be taken into account when interpreting vitamin B-6 vitamer concentrations. The strict ratios and strong correlations between vitamin B-6 vitamers point to a tight regulation of vitamin B-6 vitamer concentrations in blood and CSF. Given the unique design of this study, with simultaneously withdrawn blood and CSF from a large number of subjects, reliable CSF:plasma ratios and correlations of vitamin B-6 vitamers could be established.
  
  
  CONCLUSIONS
  We provide an extensive reference set of vitamin B-6 vitamer concentrations in plasma and CSF. In addition to providing insight on the regulation of individual vitamers and their intercompartmental distribution, we anticipate that these data will prove to be a valuable reference set for the diagnosis and treatment of conditions associated with altered vitamin B-6 metabolism.
authors.affiliation: Department of Medical Genetics, University Medical Center Utrecht, Utrecht, Netherlands (MA, MB, JJMJ, ES, MGMdS-vdV, NVVAMK, and NMV-D); the Neurogenetics Unit (JJL) and the Department of Psychiatry (SCB and RAO), Brain Center Rudolf Magnus, University Medical Center Utrecht, Utrecht, Netherlands; the Department of Psychiatry, ZNA Hospitals, Antwerp, Belgium (JJL); the Department of Anesthesiology, Intensive Care and Pain Management, Diakonessenhuis Hospital, Utrecht, Netherlands (PJB); the Department of Anesthesiology, Central Military Hospital, Utrecht, Netherlands (PJMK); the Department of Anesthesiology, Intensive Care and Pain Management, St Antonius Hospital, Nieuwegein, Netherlands (EPAvD and PB); the Department of Pediatric Metabolic Diseases, Wilhelmina Children's Hospital, University Medical Center Utrecht, Utrecht, Netherlands (GV); and the Center for Neurobehavioral Genetics, Semel Institute for Neuroscience and Human Behavior, University of California Los Angeles, Los Angeles, CA (RAO).
authors.forename: Monique
authors.initials: M
authors.lastname: Albersen
authors.affiliation: Department of Medical Genetics, University Medical Center Utrecht, Utrecht, Netherlands (MA, MB, JJMJ, ES, MGMdS-vdV, NVVAMK, and NMV-D); the Neurogenetics Unit (JJL) and the Department of Psychiatry (SCB and RAO), Brain Center Rudolf Magnus, University Medical Center Utrecht, Utrecht, Netherlands; the Department of Psychiatry, ZNA Hospitals, Antwerp, Belgium (JJL); the Department of Anesthesiology, Intensive Care and Pain Management, Diakonessenhuis Hospital, Utrecht, Netherlands (PJB); the Department of Anesthesiology, Central Military Hospital, Utrecht, Netherlands (PJMK); the Department of Anesthesiology, Intensive Care and Pain Management, St Antonius Hospital, Nieuwegein, Netherlands (EPAvD and PB); the Department of Pediatric Metabolic Diseases, Wilhelmina Children's Hospital, University Medical Center Utrecht, Utrecht, Netherlands (GV); and the Center for Neurobehavioral Genetics, Semel Institute for Neuroscience and Human Behavior, University of California Los Angeles, Los Angeles, CA (RAO).
authors.forename: Marjolein
authors.initials: M
authors.lastname: Bosma
authors.affiliation: Department of Medical Genetics, University Medical Center Utrecht, Utrecht, Netherlands (MA, MB, JJMJ, ES, MGMdS-vdV, NVVAMK, and NMV-D); the Neurogenetics Unit (JJL) and the Department of Psychiatry (SCB and RAO), Brain Center Rudolf Magnus, University Medical Center Utrecht, Utrecht, Netherlands; the Department of Psychiatry, ZNA Hospitals, Antwerp, Belgium (JJL); the Department of Anesthesiology, Intensive Care and Pain Management, Diakonessenhuis Hospital, Utrecht, Netherlands (PJB); the Department of Anesthesiology, Central Military Hospital, Utrecht, Netherlands (PJMK); the Department of Anesthesiology, Intensive Care and Pain Management, St Antonius Hospital, Nieuwegein, Netherlands (EPAvD and PB); the Department of Pediatric Metabolic Diseases, Wilhelmina Children's Hospital, University Medical Center Utrecht, Utrecht, Netherlands (GV); and the Center for Neurobehavioral Genetics, Semel Institute for Neuroscience and Human Behavior, University of California Los Angeles, Los Angeles, CA (RAO).
authors.forename: Jurjen J
authors.initials: JJ
authors.lastname: Luykx
authors.affiliation: Department of Medical Genetics, University Medical Center Utrecht, Utrecht, Netherlands (MA, MB, JJMJ, ES, MGMdS-vdV, NVVAMK, and NMV-D); the Neurogenetics Unit (JJL) and the Department of Psychiatry (SCB and RAO), Brain Center Rudolf Magnus, University Medical Center Utrecht, Utrecht, Netherlands; the Department of Psychiatry, ZNA Hospitals, Antwerp, Belgium (JJL); the Department of Anesthesiology, Intensive Care and Pain Management, Diakonessenhuis Hospital, Utrecht, Netherlands (PJB); the Department of Anesthesiology, Central Military Hospital, Utrecht, Netherlands (PJMK); the Department of Anesthesiology, Intensive Care and Pain Management, St Antonius Hospital, Nieuwegein, Netherlands (EPAvD and PB); the Department of Pediatric Metabolic Diseases, Wilhelmina Children's Hospital, University Medical Center Utrecht, Utrecht, Netherlands (GV); and the Center for Neurobehavioral Genetics, Semel Institute for Neuroscience and Human Behavior, University of California Los Angeles, Los Angeles, CA (RAO).
authors.forename: Judith J M
authors.initials: JJ
authors.lastname: Jans
authors.affiliation: From the Department of Medical Genetics, University Medical Center Utrecht, Utrecht, Netherlands (MA, MB, JJMJ, ES, MGMdS-vdV, NVVAMK, and NMV-D); the Neurogenetics Unit (JJL) and the Department of Psychiatry (SCB and RAO), Brain Center Rudolf Magnus, University Medical Center Utrecht, Utrecht, Netherlands; the Department of Psychiatry, ZNA Hospitals, Antwerp, Belgium (JJL); the Department of Anesthesiology, Intensive Care and Pain Management, Diakonessenhuis Hospital, Utrecht, Netherlands (PJB); the Department of Anesthesiology, Central Military Hospital, Utrecht, Netherlands (PJMK); the Department of Anesthesiology, Intensive Care and Pain Management, St Antonius Hospital, Nieuwegein, Netherlands (EPAvD and PB); the Department of Pediatric Metabolic Diseases, Wilhelmina Children's Hospital, University Medical Center Utrecht, Utrecht, Netherlands (GV); and the Center for Neurobehavioral Genetics, Semel Institute for Neuroscience and Human Behavior, University of California Los Angeles, Los Angeles, CA (RAO).
authors.forename: Steven C
authors.initials: SC
authors.lastname: Bakker
authors.affiliation: Department of Medical Genetics, University Medical Center Utrecht, Utrecht, Netherlands (MA, MB, JJMJ, ES, MGMdS-vdV, NVVAMK, and NMV-D); the Neurogenetics Unit (JJL) and the Department of Psychiatry (SCB and RAO), Brain Center Rudolf Magnus, University Medical Center Utrecht, Utrecht, Netherlands; the Department of Psychiatry, ZNA Hospitals, Antwerp, Belgium (JJL); the Department of Anesthesiology, Intensive Care and Pain Management, Diakonessenhuis Hospital, Utrecht, Netherlands (PJB); the Department of Anesthesiology, Central Military Hospital, Utrecht, Netherlands (PJMK); the Department of Anesthesiology, Intensive Care and Pain Management, St Antonius Hospital, Nieuwegein, Netherlands (EPAvD and PB); the Department of Pediatric Metabolic Diseases, Wilhelmina Children's Hospital, University Medical Center Utrecht, Utrecht, Netherlands (GV); and the Center for Neurobehavioral Genetics, Semel Institute for Neuroscience and Human Behavior, University of California Los Angeles, Los Angeles, CA (RAO).
authors.forename: Eric
authors.initials: E
authors.lastname: Strengman
authors.affiliation: Department of Medical Genetics, University Medical Center Utrecht, Utrecht, Netherlands (MA, MB, JJMJ, ES, MGMdS-vdV, NVVAMK, and NMV-D); the Neurogenetics Unit (JJL) and the Department of Psychiatry (SCB and RAO), Brain Center Rudolf Magnus, University Medical Center Utrecht, Utrecht, Netherlands; the Department of Psychiatry, ZNA Hospitals, Antwerp, Belgium (JJL); the Department of Anesthesiology, Intensive Care and Pain Management, Diakonessenhuis Hospital, Utrecht, Netherlands (PJB); the Department of Anesthesiology, Central Military Hospital, Utrecht, Netherlands (PJMK); the Department of Anesthesiology, Intensive Care and Pain Management, St Antonius Hospital, Nieuwegein, Netherlands (EPAvD and PB); the Department of Pediatric Metabolic Diseases, Wilhelmina Children's Hospital, University Medical Center Utrecht, Utrecht, Netherlands (GV); and the Center for Neurobehavioral Genetics, Semel Institute for Neuroscience and Human Behavior, University of California Los Angeles, Los Angeles, CA (RAO).
authors.forename: Paul J
authors.initials: PJ
authors.lastname: Borgdorff
authors.affiliation: From the Department of Medical Genetics, University Medical Center Utrecht, Utrecht, Netherlands (MA, MB, JJMJ, ES, MGMdS-vdV, NVVAMK, and NMV-D); the Neurogenetics Unit (JJL) and the Department of Psychiatry (SCB and RAO), Brain Center Rudolf Magnus, University Medical Center Utrecht, Utrecht, Netherlands; the Department of Psychiatry, ZNA Hospitals, Antwerp, Belgium (JJL); the Department of Anesthesiology, Intensive Care and Pain Management, Diakonessenhuis Hospital, Utrecht, Netherlands (PJB); the Department of Anesthesiology, Central Military Hospital, Utrecht, Netherlands (PJMK); the Department of Anesthesiology, Intensive Care and Pain Management, St Antonius Hospital, Nieuwegein, Netherlands (EPAvD and PB); the Department of Pediatric Metabolic Diseases, Wilhelmina Children's Hospital, University Medical Center Utrecht, Utrecht, Netherlands (GV); and the Center for Neurobehavioral Genetics, Semel Institute for Neuroscience and Human Behavior, University of California Los Angeles, Los Angeles, CA (RAO).
authors.forename: Peter J M
authors.initials: PJ
authors.lastname: Keijzers
authors.affiliation: Department of Medical Genetics, University Medical Center Utrecht, Utrecht, Netherlands (MA, MB, JJMJ, ES, MGMdS-vdV, NVVAMK, and NMV-D); the Neurogenetics Unit (JJL) and the Department of Psychiatry (SCB and RAO), Brain Center Rudolf Magnus, University Medical Center Utrecht, Utrecht, Netherlands; the Department of Psychiatry, ZNA Hospitals, Antwerp, Belgium (JJL); the Department of Anesthesiology, Intensive Care and Pain Management, Diakonessenhuis Hospital, Utrecht, Netherlands (PJB); the Department of Anesthesiology, Central Military Hospital, Utrecht, Netherlands (PJMK); the Department of Anesthesiology, Intensive Care and Pain Management, St Antonius Hospital, Nieuwegein, Netherlands (EPAvD and PB); the Department of Pediatric Metabolic Diseases, Wilhelmina Children's Hospital, University Medical Center Utrecht, Utrecht, Netherlands (GV); and the Center for Neurobehavioral Genetics, Semel Institute for Neuroscience and Human Behavior, University of California Los Angeles, Los Angeles, CA (RAO).
authors.forename: Eric P A
authors.initials: EP
authors.lastname: van Dongen
authors.affiliation: Department of Medical Genetics, University Medical Center Utrecht, Utrecht, Netherlands (MA, MB, JJMJ, ES, MGMdS-vdV, NVVAMK, and NMV-D); the Neurogenetics Unit (JJL) and the Department of Psychiatry (SCB and RAO), Brain Center Rudolf Magnus, University Medical Center Utrecht, Utrecht, Netherlands; the Department of Psychiatry, ZNA Hospitals, Antwerp, Belgium (JJL); the Department of Anesthesiology, Intensive Care and Pain Management, Diakonessenhuis Hospital, Utrecht, Netherlands (PJB); the Department of Anesthesiology, Central Military Hospital, Utrecht, Netherlands (PJMK); the Department of Anesthesiology, Intensive Care and Pain Management, St Antonius Hospital, Nieuwegein, Netherlands (EPAvD and PB); the Department of Pediatric Metabolic Diseases, Wilhelmina Children's Hospital, University Medical Center Utrecht, Utrecht, Netherlands (GV); and the Center for Neurobehavioral Genetics, Semel Institute for Neuroscience and Human Behavior, University of California Los Angeles, Los Angeles, CA (RAO).
authors.forename: Peter
authors.initials: P
authors.lastname: Bruins
authors.affiliation: Department of Medical Genetics, University Medical Center Utrecht, Utrecht, Netherlands (MA, MB, JJMJ, ES, MGMdS-vdV, NVVAMK, and NMV-D); the Neurogenetics Unit (JJL) and the Department of Psychiatry (SCB and RAO), Brain Center Rudolf Magnus, University Medical Center Utrecht, Utrecht, Netherlands; the Department of Psychiatry, ZNA Hospitals, Antwerp, Belgium (JJL); the Department of Anesthesiology, Intensive Care and Pain Management, Diakonessenhuis Hospital, Utrecht, Netherlands (PJB); the Department of Anesthesiology, Central Military Hospital, Utrecht, Netherlands (PJMK); the Department of Anesthesiology, Intensive Care and Pain Management, St Antonius Hospital, Nieuwegein, Netherlands (EPAvD and PB); the Department of Pediatric Metabolic Diseases, Wilhelmina Children's Hospital, University Medical Center Utrecht, Utrecht, Netherlands (GV); and the Center for Neurobehavioral Genetics, Semel Institute for Neuroscience and Human Behavior, University of California Los Angeles, Los Angeles, CA (RAO).
authors.forename: Monique G M
authors.initials: MG
authors.lastname: de Sain-van der Velden
authors.affiliation: Department of Medical Genetics, University Medical Center Utrecht, Utrecht, Netherlands (MA, MB, JJMJ, ES, MGMdS-vdV, NVVAMK, and NMV-D); the Neurogenetics Unit (JJL) and the Department of Psychiatry (SCB and RAO), Brain Center Rudolf Magnus, University Medical Center Utrecht, Utrecht, Netherlands; the Department of Psychiatry, ZNA Hospitals, Antwerp, Belgium (JJL); the Department of Anesthesiology, Intensive Care and Pain Management, Diakonessenhuis Hospital, Utrecht, Netherlands (PJB); the Department of Anesthesiology, Central Military Hospital, Utrecht, Netherlands (PJMK); the Department of Anesthesiology, Intensive Care and Pain Management, St Antonius Hospital, Nieuwegein, Netherlands (EPAvD and PB); the Department of Pediatric Metabolic Diseases, Wilhelmina Children's Hospital, University Medical Center Utrecht, Utrecht, Netherlands (GV); and the Center for Neurobehavioral Genetics, Semel Institute for Neuroscience and Human Behavior, University of California Los Angeles, Los Angeles, CA (RAO).
authors.forename: Gepke
authors.initials: G
authors.lastname: Visser
authors.affiliation: Department of Medical Genetics, University Medical Center Utrecht, Utrecht, Netherlands (MA, MB, JJMJ, ES, MGMdS-vdV, NVVAMK, and NMV-D); the Neurogenetics Unit (JJL) and the Department of Psychiatry (SCB and RAO), Brain Center Rudolf Magnus, University Medical Center Utrecht, Utrecht, Netherlands; the Department of Psychiatry, ZNA Hospitals, Antwerp, Belgium (JJL); the Department of Anesthesiology, Intensive Care and Pain Management, Diakonessenhuis Hospital, Utrecht, Netherlands (PJB); the Department of Anesthesiology, Central Military Hospital, Utrecht, Netherlands (PJMK); the Department of Anesthesiology, Intensive Care and Pain Management, St Antonius Hospital, Nieuwegein, Netherlands (EPAvD and PB); the Department of Pediatric Metabolic Diseases, Wilhelmina Children's Hospital, University Medical Center Utrecht, Utrecht, Netherlands (GV); and the Center for Neurobehavioral Genetics, Semel Institute for Neuroscience and Human Behavior, University of California Los Angeles, Los Angeles, CA (RAO).
authors.forename: Nine V V A M
authors.initials: NV
authors.lastname: Knoers
authors.affiliation: Department of Medical Genetics, University Medical Center Utrecht, Utrecht, Netherlands (MA, MB, JJMJ, ES, MGMdS-vdV, NVVAMK, and NMV-D); the Neurogenetics Unit (JJL) and the Department of Psychiatry (SCB and RAO), Brain Center Rudolf Magnus, University Medical Center Utrecht, Utrecht, Netherlands; the Department of Psychiatry, ZNA Hospitals, Antwerp, Belgium (JJL); the Department of Anesthesiology, Intensive Care and Pain Management, Diakonessenhuis Hospital, Utrecht, Netherlands (PJB); the Department of Anesthesiology, Central Military Hospital, Utrecht, Netherlands (PJMK); the Department of Anesthesiology, Intensive Care and Pain Management, St Antonius Hospital, Nieuwegein, Netherlands (EPAvD and PB); the Department of Pediatric Metabolic Diseases, Wilhelmina Children's Hospital, University Medical Center Utrecht, Utrecht, Netherlands (GV); and the Center for Neurobehavioral Genetics, Semel Institute for Neuroscience and Human Behavior, University of California Los Angeles, Los Angeles, CA (RAO).
authors.forename: Roel A
authors.initials: RA
authors.lastname: Ophoff
authors.affiliation: Department of Medical Genetics, University Medical Center Utrecht, Utrecht, Netherlands (MA, MB, JJMJ, ES, MGMdS-vdV, NVVAMK, and NMV-D); the Neurogenetics Unit (JJL) and the Department of Psychiatry (SCB and RAO), Brain Center Rudolf Magnus, University Medical Center Utrecht, Utrecht, Netherlands; the Department of Psychiatry, ZNA Hospitals, Antwerp, Belgium (JJL); the Department of Anesthesiology, Intensive Care and Pain Management, Diakonessenhuis Hospital, Utrecht, Netherlands (PJB); the Department of Anesthesiology, Central Military Hospital, Utrecht, Netherlands (PJMK); the Department of Anesthesiology, Intensive Care and Pain Management, St Antonius Hospital, Nieuwegein, Netherlands (EPAvD and PB); the Department of Pediatric Metabolic Diseases, Wilhelmina Children's Hospital, University Medical Center Utrecht, Utrecht, Netherlands (GV); and the Center for Neurobehavioral Genetics, Semel Institute for Neuroscience and Human Behavior, University of California Los Angeles, Los Angeles, CA (RAO).
authors.forename: Nanda M
authors.initials: NM
authors.lastname: Verhoeven-Duif
mesh_terms: D000293:Adolescent; D000328:Adult; D000465:Algorithms; D002851:Chromatography, High Pressure Liquid; D005260:Female; D006801:Humans; D057230:Limit of Detection; D008297:Male; D008875:Middle Aged; D009426:Netherlands; D011730:Pyridoxal / Q000097:blood / Q000134:cerebrospinal fluid; D011732:Pyridoxal Phosphate / Q000097:blood / Q000134:cerebrospinal fluid; D011733:Pyridoxamine / Q000134:cerebrospinal fluid; D011735:Pyridoxic Acid / Q000097:blood / Q000134:cerebrospinal fluid; D012016:Reference Values; D015203:Reproducibility of Results; D012727:Sex Characteristics; D053719:Tandem Mass Spectrometry; D025101:Vitamin B 6 / Q000097:blood* / Q000134:cerebrospinal fluid*; D055815:Young Adult
chemical_list: D011730:Pyridoxal; D011735:Pyridoxic Acid; D011732:Pyridoxal Phosphate; D011733:Pyridoxamine; D025101:Vitamin B 6