Estimation of pyruvate dehydrogenase (E1) activity in human skeletal muscle; three cases with E1 deficiency. 1988

H L van Laack, and W Ruitenbeek, and J M Trijbels, and R C Sengers, and F J Gabreëls, and A J Janssen, and C M Kerkhof
Department of Pediatrics, University Hospital, University of Nijmegen, The Netherlands.

Pyruvate dehydrogenase (E1) catalyzes the rate-limiting step of the pyruvate dehydrogenase complex. Since E1 activity of human muscle tissue is low, a sensitive method is needed for diagnostic purposes. Measurement of 14CO2 production from [1-14C]pyruvate provides a specific and sensitive assay for measuring E1 activity. We use as artificial electron acceptor dichlorophenolindophenol (DCPIP) instead of the often applied ferricyanide. The method can be applied to small muscle samples obtained by needle or open biopsy. We prefer to use total homogenate because E1 activities in homogenate are higher than in the corresponding 600-g supernatant of skeletal muscle tissue. Control values in homogenate are higher or of the same order as those reported by others.

UI MeSH Term Description Entries
D008297 Male Males
D008875 Middle Aged An adult aged 45 - 64 years. Middle Age
D009132 Muscles Contractile tissue that produces movement in animals. Muscle Tissue,Muscle,Muscle Tissues,Tissue, Muscle,Tissues, Muscle
D011768 Pyruvate Dehydrogenase Complex A multienzyme complex responsible for the formation of ACETYL COENZYME A from pyruvate. The enzyme components are PYRUVATE DEHYDROGENASE (LIPOAMIDE); dihydrolipoamide acetyltransferase; and LIPOAMIDE DEHYDROGENASE. Pyruvate dehydrogenase complex is subject to three types of control: inhibited by acetyl-CoA and NADH; influenced by the energy state of the cell; and inhibited when a specific serine residue in the pyruvate decarboxylase is phosphorylated by ATP. PYRUVATE DEHYDROGENASE (LIPOAMIDE)-PHOSPHATASE catalyzes reactivation of the complex. (From Concise Encyclopedia Biochemistry and Molecular Biology, 3rd ed) Complex, Pyruvate Dehydrogenase,Dehydrogenase Complex, Pyruvate
D002250 Carbon Radioisotopes Unstable isotopes of carbon that decay or disintegrate emitting radiation. C atoms with atomic weights 10, 11, and 14-16 are radioactive carbon isotopes. Radioisotopes, Carbon
D005260 Female Females
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000293 Adolescent A person 13 to 18 years of age. Adolescence,Youth,Adolescents,Adolescents, Female,Adolescents, Male,Teenagers,Teens,Adolescent, Female,Adolescent, Male,Female Adolescent,Female Adolescents,Male Adolescent,Male Adolescents,Teen,Teenager,Youths
D000328 Adult A person having attained full growth or maturity. Adults are of 19 through 44 years of age. For a person between 19 and 24 years of age, YOUNG ADULT is available. Adults
D015325 Pyruvate Dehydrogenase Complex Deficiency Disease An inherited metabolic disorder caused by deficient enzyme activity in the PYRUVATE DEHYDROGENASE COMPLEX, resulting in deficiency of acetyl CoA and reduced synthesis of acetylcholine. Two clinical forms are recognized: neonatal and juvenile. The neonatal form is a relatively common cause of lactic acidosis in the first weeks of life and may also feature an erythematous rash. The juvenile form presents with lactic acidosis, alopecia, intermittent ATAXIA; SEIZURES; and an erythematous rash. (From J Inherit Metab Dis 1996;19(4):452-62) Autosomal recessive and X-linked forms are caused by mutations in the genes for the three different enzyme components of this multisubunit pyruvate dehydrogenase complex. One of the mutations at Xp22.2-p22.1 in the gene for the E1 alpha component of the complex leads to LEIGH DISEASE. Ataxia with Lactic Acidosis, Type I,Lactic Acidosis with Ataxia, Type I,Ataxia with Lactic Acidosis,Ataxia with Lactic Acidosis I,Ataxia, Intermittent, with Abnormal Pyruvate Metabolism,Ataxia, Intermittent, with Pyruvate Dehydrogenase, or Decarboxylase, Deficiency,Intermittent Ataxia with Pyruvate Dehydrogenase Deficiency,Juvenile Pyruvate Dehydrogenase Complex Deficiency Disease,Neonatal Pyruvate Dehydrogenase Complex Deficiency Disease,PDH Deficiency,PDHC Deficiency,PDHC Deficiency Disease,Pyruvate Decarboxylase Deficiency,Pyruvate Dehydrogenase Complex Deficiency,Pyruvate Dehydrogenase Complex Deficiency Disease, Juvenile,Pyruvate Dehydrogenase Complex Deficiency Disease, Neonatal,Pyruvate Dehydrogenase Deficiency,Type I Ataxia with Lactic Acidosis,Deficiency, PDH,Deficiency, PDHC,Deficiency, Pyruvate Decarboxylase,Deficiency, Pyruvate Dehydrogenase

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