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  • 1
    ISSN: 1432-1076
    Keywords: Key words Homocystinuria ; Excitotoxicity ; Organotypic cultures ; Xenopus oocytes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The excitotoxic action of homocysteine and related sulphur-containing metabolites was investigated in organotpyic cultures derived from rat brain cortex and hippocampus by inhibition experiments using antagonists selective for different glutamate receptor subtypes. In addition the direct interaction of these metabolites with glutamate receptors expressed in frog oocytes was tested by conventional two electrode voltage clamp techniques. Conclusion Neurodegeneration and epilepsy observed in homocystinuria may be mediated by l-homocysteic and l-homocysteine sulphinic acid. Both metabolites exhibit excitotoxic potency by interaction with different glutamate receptor subtypes.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-1076
    Keywords: Key words Mitochondria ; Fatty acid oxidation ; LCHAD-deficiency ; Mitochondriopathy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We report on a boy who suffered from microcephaly, growth retardation, cardiomyopathy and hepatic dysfunction. When he had his first febrile infection at the age of 3 months he showed metabolic decompensation. Laboratory parameters and clinical features were compatible with a β-oxidation defect or a respiratory chain disorder. Measurement of β-oxidation enzymes showed long-chain 3-hydroxyacyl CoA dehydrogenase (LCHAD) deficiency; determination of respiratory chain complex activities revealed complete absence of complex I, II, III and IV activities in skeletal muscle and reduced activities of complexes II and IV in cultured fibroblasts, with secondary dysregulation of ATP synthase. The patient was found to be homozygous for the MTP:G1528 C mutation (LCHAD-deficiency). Conclusion This patient had LCHAD deficiency as his primary metabolic disorder, leading to secondary inhibition of respiratory chain enzymes by ‘toxic’ metabolites.
    Type of Medium: Electronic Resource
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