Expression of 2,3,7,8-tetrachlorodibenzo-p-dioxin-inducible cytochrome P4501A1 in human splenic lymphocyte cultures.
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.
Jeong
H G
HG
Department of Environmental Science, Chosun University, Dong-ku, Kwangju City, South Korea.
Yang
K H
KH
D002478:Cells, Cultured; D019363:Cytochrome P-450 CYP1A1; D003577:Cytochrome P-450 Enzyme System / Q000096:biosynthesis* / Q000378:metabolism; D004790:Enzyme Induction / Q000187:drug effects; D006801:Humans; D008214:Lymphocytes / Q000187:drug effects* / Q000201:enzymology*; D008934:Mitogens / Q000494:pharmacology; D010088:Oxidoreductases / Q000378:metabolism; D000072317:Polychlorinated Dibenzodioxins / Q000494:pharmacology*; D013154:Spleen / Q000166:cytology / Q000187:drug effects / Q000201:enzymology; D013268:Stimulation, Chemical
D008934:Mitogens; D000072317:Polychlorinated Dibenzodioxins; D003577:Cytochrome P-450 Enzyme System; D010088:Oxidoreductases; D019363:Cytochrome P-450 CYP1A1