Abstract
Disodium ethylenediamine tetraacetic acid and/or allylisopropylacetamide administration to rat pups did not evoke a premature induction of hepatic δ-aminolevulinic acid synthetase. Administration of iron to adult rats did not alter δ-aminolevulinic acid synthetase activity and had little inductive effect on heme oxygenase activity. Both heme and cobalt/dextran rapidly induced microsomal heme oxygenase by 3–8 fold. Induction of heme oxygenase by heme could be totally blocked by concurrent administration of cycloheximide. These results argue against the hypothesis that iron is the physiological mediator of δ-aminolevulinic acid synthetase activity.
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