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Smith, A.G. et al.

Continued depression of hepatic uroporphyrinogen decarboxylase activity caused by hexachlorobenzene or 2,3,7,8-tetrachlorodibenzo-p-dioxin despite regeneration after partial hepatectomy.

Hepatic uroporphyrinogen decarboxylase activity in male C57BL/10 mice was maintained in regenerated liver after recovery from two-thirds hepatectomy. In contrast, there was little increase in enzyme activity in regenerated liver from animals previously treated with hexachlorobenzene (HCB) or 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD). These chemicals initially cause depression of uroporphyrinogen decarboxylase activity over a time much longer than the period allowed for regeneration. Estimation of HCB levels showed that there was only a small amount of redistribution to the liver during regrowth. The results demonstrate that HCB and TCDD induce either formation of a toxic metabolite or some other inhibitory process and that this can be sustained for a long period which delays recovery to the normal state.[1]

References

Continued depression of hepatic uroporphyrinogen decarboxylase activity caused by hexachlorobenzene or 2,3,7,8-tetrachlorodibenzo-p-dioxin despite regeneration after partial hepatectomy. Smith, A.G., Francis, J.E., Greig, J.B. Biochem. Pharmacol. (1985) [Pubmed]

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