Pyruvate carboxylase and phosphoenolpyruvate carboxykinase activity in leukocytes and fibroblasts from a patient with pyruvate carboxylase deficiency

Pediatric Research
B M AtkinM B Weinberg

Abstract

Normal values are given for the activities of pyruvate carboxylase (E.C.6.4.1.1), mitochondrial phosphoenolpyruvate carboxykinase (E.C. 4.1.1.32, PEPCK), and citrate synthase (E.C. 4.1.3.7) in fibroblasts, lymphocytes, and leukocytes. Also given are values for these enzymes in the leukocytes and fibroblasts from a severely mentally and developmentally retarded patient with proximal renal tubular acidosis and hepatic, cerebral, and renal cortical pyruvate carboxylase deficiency. In normals, virtually all of the mitochondrial PEPCK and pyruvate carboxylase activity was present in the mononuclear leukocyte fraction of whole venous blood. Cellular fractionation studies with human lymphocytes and fibroblasts demonstrated that all of the PEPCK activity in these cells is mitochondrial. Normal values for pyruvate carboxylase in leukocytes were 0.092 (0.070--0.208) mU/mg protein (n=5), in lymphocytes 0.154 (0.092--0.262) mU/mg protein (n=5), and in fibroblasts 1.36 (0.778--2.19) mU/mg protein (n=5). The patient with hepatic, renal, and cerebral pyruvate carboxylase deficiency had no detectable activity (less than 0.009 mU/mg protein) in his leukocytes and 0.018 mU/mg protein in his fibroblasts. Data from an assay for pyruvate carboxylas...Continue Reading

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Related Concepts

Renal Tubular Acidosis, Type II
Citrate (si)-Synthase
Fibroblasts
Lactate Dehydrogenase
Leukocytes
Lymphoid Cells
Profound Mental Retardation
Inborn Errors of Metabolism
Mitochondria
GTP-Dependent Phosphoenolpyruvate Carboxykinase

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