Table 1

Induction of UGT (4-MUF as substrate) and EROD activities by treatment of Caco-2 cell clones TC7 and PF11 with TBHQ or TCDD

Enzyme TreatmentEnzyme activity1-a
Caco-2, clone TC7Caco-2, clone PF11
UGT (nmol/min/mg protein)
Controls7.7  ± 0.80.6  ± 0.1
TBHQ (80 μM)15.8  ± 3.0 (2.1)1-b 1.5  ± 0.3 (2.5)
TCDD (10 nM)12.6  ± 1.8 (1.6)1.9  ± 1.2 (3.2)
EROD (pmol/min/mg protein)
Controls3.9  ± 0.93.1  ± 0.9
TBHQ (80 μM)13.1  ± 6.8 (3.4)7.2  ± 2.7 (2.3)
TCDD (10 nM)379  ± 146 (97)252  ± 123 (81.3)
  • 1-a Data represent means ± S.D. (n = 4).

  • 1-b Induction factors are given in parenthesis. They were found to be significantly different from controls (p< .05).