Abstract
The induction of cytochrome P4501A1 (P4501A1) and P4501A1-specific 7-ethoxyresorufin O -deethylase (EROD) activity by 2,3,7,8-tetrachlorodibenzo- p -dioxin (TCDD) was investigated in human splenic lymphocytes cultures. EROD activity was induced by TCDD in mitogen (phytohemagglutinin and pokeweed mitogen) stimulated blast cells but not in the resting cells. TCDD markedly induced EROD activity in a dose- and time-dependent manner. The expression of P4501A1 mRNA was increased by TCDD in mitogen-stimulated cells as detected by Northern blot analysis. These findings support the conclusion that TCDD induced the expression of P4501A1 gene, resulting in increased EROD activity in mitogen-stimulated human splenic lymphocytes cultures.
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