Stefan Kölker

Summary

Affiliation: University of Heidelberg
Country: Germany

Publications

  1. ncbi Contribution of reactive oxygen species to 3-hydroxyglutarate neurotoxicity in primary neuronal cultures from chick embryo telencephalons
    S Kolker
    Division of Metabolic and Endocrine Diseases, University Children s Hospital Heidelberg, DE 69120 Heidelberg, Germany
    Pediatr Res 50:76-82. 2001
  2. ncbi Looking forward--an evidence-based approach to glutaryl-CoA dehydrogenase deficiency
    S Kolker
    Department of General Pediatrics, Division of Metabolic and Endocrine Diseases, University Children s Hospital, D 69120 Heidelberg, Germany
    J Inherit Metab Dis 27:921-6. 2004
  3. ncbi Challenges for basic research in glutaryl-CoA dehydrogenase deficiency
    S Kolker
    Department of General Pediatrics, Division of Metabolic and Endocrine Diseases, University Children s Hospital Heidelberg, D 69120 Heidelberg, Germany
    J Inherit Metab Dis 27:843-9. 2004
  4. ncbi Excitotoxicity and bioenergetics in glutaryl-CoA dehydrogenase deficiency
    S Kolker
    Department of General Pediatrics, University Children s Hospital, D 69120 Heidelberg, Germany
    J Inherit Metab Dis 27:805-12. 2004
  5. ncbi Pathomechanisms of neurodegeneration in glutaryl-CoA dehydrogenase deficiency
    Stefan Kölker
    Division of Metabolic and Endocrine Diseases, University Children s Hospital, Heidelberg, Germany
    Ann Neurol 55:7-12. 2004
  6. ncbi Methylmalonic acid, a biochemical hallmark of methylmalonic acidurias but no inhibitor of mitochondrial respiratory chain
    Stefan Kölker
    Department of General Pediatrics, Division of Metabolic and Endocrine Diseases, University Children s Hospital Heidelberg, D 69120 Heidelberg, Germany
    J Biol Chem 278:47388-93. 2003
  7. ncbi 3-Ureidopropionate contributes to the neuropathology of 3-ureidopropionase deficiency and severe propionic aciduria: a hypothesis
    S Kolker
    Division of Metabolic and Endocrine Diseases, University Children s Hospital, Heidelberg, Germany
    J Neurosci Res 66:666-73. 2001
  8. ncbi Potentiation of 3-hydroxyglutarate neurotoxicity following induction of astrocytic iNOS in neonatal rat hippocampal cultures
    S Kolker
    Division of Metabolic and Endocrine Diseases, University Children s Hospital, Im Neuenheimer Feld 150, D 69120 Heidelberg, Germany
    Eur J Neurosci 13:2115-22. 2001
  9. ncbi Ca(2+) and Na(+) dependence of 3-hydroxyglutarate-induced excitotoxicity in primary neuronal cultures from chick embryo telencephalons
    Stefan Kölker
    Division of Metabolic and Endocrine Diseases, University Children s Hospital, Heidelberg, Germany
    Pediatr Res 52:199-206. 2002
  10. ncbi Chronic treatment with glutaric acid induces partial tolerance to excitotoxicity in neuronal cultures from chick embryo telencephalons
    Stefan Kölker
    Division of Metabolic and Endocrine Diseases, University Children s Hospital, Heidelberg, Germany
    J Neurosci Res 68:424-31. 2002

Detail Information

Publications33

  1. ncbi Contribution of reactive oxygen species to 3-hydroxyglutarate neurotoxicity in primary neuronal cultures from chick embryo telencephalons
    S Kolker
    Division of Metabolic and Endocrine Diseases, University Children s Hospital Heidelberg, DE 69120 Heidelberg, Germany
    Pediatr Res 50:76-82. 2001
    ....
  2. ncbi Looking forward--an evidence-based approach to glutaryl-CoA dehydrogenase deficiency
    S Kolker
    Department of General Pediatrics, Division of Metabolic and Endocrine Diseases, University Children s Hospital, D 69120 Heidelberg, Germany
    J Inherit Metab Dis 27:921-6. 2004
    ....
  3. ncbi Challenges for basic research in glutaryl-CoA dehydrogenase deficiency
    S Kolker
    Department of General Pediatrics, Division of Metabolic and Endocrine Diseases, University Children s Hospital Heidelberg, D 69120 Heidelberg, Germany
    J Inherit Metab Dis 27:843-9. 2004
    ....
  4. ncbi Excitotoxicity and bioenergetics in glutaryl-CoA dehydrogenase deficiency
    S Kolker
    Department of General Pediatrics, University Children s Hospital, D 69120 Heidelberg, Germany
    J Inherit Metab Dis 27:805-12. 2004
    ..Finally, maturation-dependent changes in the expression of neuronal glutamate receptors may affect the vulnerability of the immature brain to excitotoxic cell damage in this disease...
  5. ncbi Pathomechanisms of neurodegeneration in glutaryl-CoA dehydrogenase deficiency
    Stefan Kölker
    Division of Metabolic and Endocrine Diseases, University Children s Hospital, Heidelberg, Germany
    Ann Neurol 55:7-12. 2004
    ..Finally, maturation-dependent changes in the expression of neuronal glutamate receptors may affect the vulnerability to 3-hydroxyglutaric and glutaric acid toxicity...
  6. ncbi Methylmalonic acid, a biochemical hallmark of methylmalonic acidurias but no inhibitor of mitochondrial respiratory chain
    Stefan Kölker
    Department of General Pediatrics, Division of Metabolic and Endocrine Diseases, University Children s Hospital Heidelberg, D 69120 Heidelberg, Germany
    J Biol Chem 278:47388-93. 2003
    ..Inhibition of respiratory chain and tricarboxylic acid cycle is most likely induced by synergistically acting alternative metabolites, in particular 2-methylcitric acid, malonic acid, and propionyl-CoA...
  7. ncbi 3-Ureidopropionate contributes to the neuropathology of 3-ureidopropionase deficiency and severe propionic aciduria: a hypothesis
    S Kolker
    Division of Metabolic and Endocrine Diseases, University Children s Hospital, Heidelberg, Germany
    J Neurosci Res 66:666-73. 2001
    ..In conclusion, our results provide strong evidence that 3-UPA acts as endogenous neurotoxin via inhibition of mitochondrial energy metabolism, resulting in the initiation of secondary, energy-dependent excitotoxic mechanisms...
  8. ncbi Potentiation of 3-hydroxyglutarate neurotoxicity following induction of astrocytic iNOS in neonatal rat hippocampal cultures
    S Kolker
    Division of Metabolic and Endocrine Diseases, University Children s Hospital, Im Neuenheimer Feld 150, D 69120 Heidelberg, Germany
    Eur J Neurosci 13:2115-22. 2001
    ..Thus, we provide evidence for a neuroimmunological approach to the precipitation of acute encephalopathic crises in GDD by inflammatory cytokines...
  9. ncbi Ca(2+) and Na(+) dependence of 3-hydroxyglutarate-induced excitotoxicity in primary neuronal cultures from chick embryo telencephalons
    Stefan Kölker
    Division of Metabolic and Endocrine Diseases, University Children s Hospital, Heidelberg, Germany
    Pediatr Res 52:199-206. 2002
    ..In conclusion, the present study revealed that NMDA receptor activation and subsequent disturbance of Ca(2+) homeostasis contribute to 3-OH-GA-induced cell damage...
  10. ncbi Chronic treatment with glutaric acid induces partial tolerance to excitotoxicity in neuronal cultures from chick embryo telencephalons
    Stefan Kölker
    Division of Metabolic and Endocrine Diseases, University Children s Hospital, Heidelberg, Germany
    J Neurosci Res 68:424-31. 2002
    ....
  11. ncbi NMDA receptor activation and respiratory chain complex V inhibition contribute to neurodegeneration in d-2-hydroxyglutaric aciduria
    Stefan Kölker
    Division of Metabolic and Endocrine Diseases, University Children s Hospital, Im Neuenheimer Feld 150, D 69120 Heidelberg, Germany
    Eur J Neurosci 16:21-8. 2002
    ..In conclusion, excitotoxicity contributes to the neuropathology of d-2-hydroxyglutaric aciduria, highlighting new neuroprotective strategies...
  12. ncbi Neurodegeneration in methylmalonic aciduria involves inhibition of complex II and the tricarboxylic acid cycle, and synergistically acting excitotoxicity
    Jürgen G Okun
    Department of Pediatrics, Division of Metabolic and Endocrine Diseases, Im Neuenheimer Feld 150, Federal Republic of Germany
    J Biol Chem 277:14674-80. 2002
    ..We propose that neuropathogenesis of methylmalonic aciduria may involve an inhibition of complex II and the tricarboxylic acid cycle by accumulating toxic organic acids, and synergistic secondary excitotoxic mechanisms...
  13. ncbi Bioenergetics in glutaryl-coenzyme A dehydrogenase deficiency: a role for glutaryl-coenzyme A
    Sven W Sauer
    Department of General Pediatrics, Division of Inborn Metabolic Diseases, University Children s Hospital of Heidelberg, Im Neuenheimer Feld 150, D 69120 Heidelberg, Germany
    J Biol Chem 280:21830-6. 2005
    ..In conclusion, our results demonstrate that bioenergetic impairment may play an important role in the pathomechanisms underlying neurodegenerative changes in glutaryl-CoA dehydrogenase deficiency...
  14. ncbi Intracerebral accumulation of glutaric and 3-hydroxyglutaric acids secondary to limited flux across the blood-brain barrier constitute a biochemical risk factor for neurodegeneration in glutaryl-CoA dehydrogenase deficiency
    Sven W Sauer
    Department of General Pediatrics, Division of Inborn Metabolic Diseases, University Children s Hospital Heidelberg, Heidelberg, Germany
    J Neurochem 97:899-910. 2006
    ..In conclusion, we propose that an intracerebral de novo synthesis and subsequent trapping of GA and 3-OH-GA should be considered as a biochemical risk factor for neurodegeneration in GCDH deficiency...
  15. ncbi Glutaric aciduria type I and methylmalonic aciduria: simulation of cerebral import and export of accumulating neurotoxic dicarboxylic acids in in vitro models of the blood-brain barrier and the choroid plexus
    Sven W Sauer
    Department of General Pediatrics, Division of Inborn Metabolic Diseases, University Children s Hospital Heidelberg, D 69120 Heidelberg, Germany
    Biochim Biophys Acta 1802:552-60. 2010
    ..In conclusion, our results indicate a low but specific efflux transport for GA, 3-OH-GA, and MMA across pBCEC, an in vitro model of the BBB, via OAT1 and OAT3 but not across hCPEC, an in vitro model of the choroid plexus...
  16. ncbi Optimized spectrophotometric assay for the completely activated pyruvate dehydrogenase complex in fibroblasts
    Marina A Schwab
    Division of Metabolic and Endocrine Diseases, University Children s Hospital Heidelberg, 69120 Heidelberg, Germany
    Clin Chem 51:151-60. 2005
    ..The most commonly used radiochemical method detects the formation of (14)CO(2), an endproduct of the E1 component of PDHc, from [1-(14)C]pyruvate...
  17. ncbi A non-enzymatic function of 17beta-hydroxysteroid dehydrogenase type 10 is required for mitochondrial integrity and cell survival
    Katharina Rauschenberger
    Institute of Human Genetics, Heidelberg University, Heidelberg, Germany
    EMBO Mol Med 2:51-62. 2010
    ..Therefore alternative therapeutic approaches to an isoleucine-restricted diet are required...
  18. ncbi Phenylalanine reduces synaptic density in mixed cortical cultures from mice
    Friederike Hörster
    Department of General Pediatrics, University of Children s Hospital, Heidelberg, Germany
    Pediatr Res 59:544-8. 2006
    ....
  19. ncbi Complementary dietary treatment using lysine-free, arginine-fortified amino acid supplements in glutaric aciduria type I - A decade of experience
    Stefan Kölker
    Department of General Pediatrics, Division of Inherited Metabolic Diseases, University Hospital Heidelberg, Heidelberg, Germany
    Mol Genet Metab 107:72-80. 2012
    ....
  20. ncbi Use of guidelines improves the neurological outcome in glutaric aciduria type I
    Jana Heringer
    Department of General Pediatrics, Division of Inherited Metabolic Diseases, University Hospital Heidelberg, Heidelberg, Germany
    Ann Neurol 68:743-52. 2010
    ..To evaluate the effect of treatment according to current evidence-based recommendations on the neurological outcome of patients with glutaric aciduria type I (GA-I)...
  21. ncbi Secondary mitochondrial dysfunction in propionic aciduria: a pathogenic role for endogenous mitochondrial toxins
    Marina A Schwab
    Department of General Pediatrics, Division of Inborn Metabolic Diseases, University Children's Hospital Heidelberg, Im Neuenheimer Feld 150, D-69120 Heidelberg, Germany
    Biochem J 398:107-12. 2006
    ....
  22. ncbi Therapeutic modulation of cerebral L-lysine metabolism in a mouse model for glutaric aciduria type I
    Sven W Sauer
    Department of General Paediatrics, Division of Inborn Metabolic Diseases, University Children s Hospital, Im Neuenheimer Feld 430, D 69120 Heidelberg, Germany
    Brain 134:157-70. 2011
    ....
  23. ncbi Decline of acute encephalopathic crises in children with glutaryl-CoA dehydrogenase deficiency identified by newborn screening in Germany
    Stefan Kölker
    Department of General Pediatrics, Division of Inborn Metabolic Diseases, University Children s Hospital Heidelberg, D 69120 Heidelberg, Germany
    Pediatr Res 62:357-63. 2007
    ..No patient was known to be missed by newborn screening from 1999 to 2005. In conclusion, this study confirms that newborn screening for GCDH deficiency in combination with intensive management is beneficial...
  24. ncbi Incidence and short-term outcome of children with symptomatic presentation of organic acid and fatty acid oxidation disorders in Germany
    Daniela A Klose
    Division of Metabolic and Endocrine Disorders, University Children's Hospital, Heidelberg, Germany
    Pediatrics 110:1204-11. 2002
    ....
  25. ncbi A method for quantitative acylcarnitine profiling in human skin fibroblasts using unlabelled palmitic acid: diagnosis of fatty acid oxidation disorders and differentiation between biochemical phenotypes of MCAD deficiency
    Jürgen G Okun
    Division of Metabolic and Endocrine Diseases, Department of General Pediatrics, University Children s Hospital, Im Neuenheimer Feld 150, D 69120 Heidelberg, Germany
    Biochim Biophys Acta 1584:91-8. 2002
    ..In conclusion, this novel technique is a powerful tool for the investigation of fatty acid oxidation disorders under standardized conditions in fibroblasts...
  26. ncbi Long-term outcome in methylmalonic acidurias is influenced by the underlying defect (mut0, mut-, cblA, cblB)
    Friederike Hörster
    Department of General Pediatrics, Division of Inborn Metabolic Diseases, University Children s Hospital, D 69120 Heidelberg, Germany
    Pediatr Res 62:225-30. 2007
    ..In addition, long-term outcome was dependent on the age cohort and cobalamin responsiveness...
  27. ncbi Metabolic decompensation in methylmalonic aciduria: which biochemical parameters are discriminative?
    Tamaris Zwickler
    Department of General Pediatrics, Division of Inherited Metabolic Diseases, University Children s Hospital Heidelberg, Im Neuenheimer Feld 430, 69120 Heidelberg, Germany
    J Inherit Metab Dis 35:797-806. 2012
    ....
  28. ncbi Dynamic changes of striatal and extrastriatal abnormalities in glutaric aciduria type I
    Inga Harting
    Department of Neuroradiology, University of Heidelberg, Heidelberg, Germany
    Brain 132:1764-82. 2009
    ..This may have widespread consequences for the pathophysiological understanding of this disease, long-term outcomes and therapeutic considerations...
  29. ncbi Diagnosis and management of glutaric aciduria type I--revised recommendations
    Stefan Kölker
    Department of General Pediatrics, Division of Inborn Metabolic Diseases, University Children s Hospital, Im Neuenheimer Feld 430, 69120 Heidelberg, Germany
    J Inherit Metab Dis 34:677-94. 2011
    ..The major aim of this revision is to re-evaluate the previous diagnostic and therapeutic recommendations for patients with this disease and incorporate new research findings into the guideline...
  30. ncbi High urgency liver transplantation in ornithine transcarbamylase deficiency presenting with acute liver failure
    Ulrike Teufel
    Department of General Pediatrics, University of Heidelberg, Heidelberg, Germany
    Pediatr Transplant 15:E110-5. 2011
    ..Patients should be managed in a center that has the capacity for an emergency liver transplantation...
  31. ncbi Deorphanization of GPR109B as a receptor for the beta-oxidation intermediate 3-OH-octanoic acid and its role in the regulation of lipolysis
    Kashan Ahmed
    Institute of Pharmacology, University of Heidelberg, and Department of General Pediatrics, University Children s Hospital Heidelberg, Im Neuenheimer Feld 366, 69120 Heidelberg, Germany
    J Biol Chem 284:21928-33. 2009
    ....
  32. ncbi Natural history, outcome, and treatment efficacy in children and adults with glutaryl-CoA dehydrogenase deficiency
    Stefan Kölker
    Department of General Pediatric, University of Children s Hospital Heidelberg, D 69120 Heidelberg, Germany
    Pediatr Res 59:840-7. 2006
    ..Notably, the biochemical phenotype did not predict the clinical phenotype. Our study proves GCDH deficiency to be a treatable disorder and a good candidate for neonatal screening...
  33. ncbi Quantitative acylcarnitine profiling in peripheral blood mononuclear cells using in vitro loading with palmitic and 2-oxoadipic acids: biochemical confirmation of fatty acid oxidation and organic acid disorders
    Andrea Schulze-Bergkamen
    Department of General Pediatrics, University Children's Hospital Heidelberg, 69120 Heidelberg, Germany
    Pediatr Res 58:873-80. 2005
    ..In conclusion, our assay allows biochemical confirmation of a number of FAOD and OAD and could easily be implemented into the confirmatory diagnostic work-up...