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1. The activities of the enzymes of haem biosynthesis were studied in 23 patients with acute intermittent porphyria. The mitochondrial enzymes delta-aminolaevulinate synthase, coproporphyrinogen oxidase and ferrochelatase were measured in leucocytes and the cytosolic enzymes delta-aminolaevulinate dehydratase, porphobilinogen deaminase and uroporphyrinogen decarboxylase in erythrocytes. 2. Leucocyte delta-aminolaevulinate synthase activity was elevated (P less than 0-001), with marked diminution of porphobilinogen deaminase activity (P less than 0-001) and reduction in the activities of delta-aminolaevulinate dehydratase (P less than 0-01) and uroporphyrinogen decarboxylase (P less than 0-005). 3. A therapeutic regimen based on intravenous laevulose infusion was studied. In four patients in acute attack and one in remission laevulose treatment was associated with a fall in delta-aminolaevulinate synthase activity, a rise in porphobilinogen deaminase and uroporphyrinogen decarboxylase activities, and a fall in urinary prophyrin precursor excretion (P less than 0-001). These studies provide a basis for the evaluation of the use of sugars in acute intermittent porphyria.
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A Goldberg
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M J Brodie, and
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M J Brodie, and
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M J Brodie, and
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M J Brodie, and
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M J Brodie, and
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