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Centro de Investigaciones sobre Porfirinas y Porfirias (CIPYP), CONICET y FCEN, UBA, Ciudad Universitaria, Buenos Aires, Republica Argentina.
1. delta-Aminolevulinic acid synthetase (ALA-S), rhodanese and microsomal heme oxygenase (MHO), were quantitated in Cl4C induced regenerating mouse liver. 2. Maximal hepatomegalia was observed at 48 hr after i.p. injection of a single dose of the toxin. 3. ALA-S activity decreased on day 2, and then significantly increased (50%) between days 3 and 7, returning afterwards to control values. 4. Cytoplasmic rhodanese, as well as MHO activities, exhibited a clear correlation as compared with the ALA-S activity profile. 5. Porphyrin biosynthesis from precursor delta-aminolevulinic acid (ALA) was significantly increased even after 15 days of intoxication. 6. Present results would indicate that Cl4C is acting in a dual fashion.
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