Metal interference on luciferase activity induced by 2,3,7,8-tetrachlorodibenzo-p-dioxin in bioassays of recombinant mouse hepatoma cells

This study will examine the effect of a series of metals on the luciferase activity expression induced by 2,3,7,8-tetrachlorodibenzo-p-dioxin (2,3,7,8-TCDD) in H1L6.1 cells. A 2-level factorial design was employed to identify major influential metal species of four test metals (As⁵⁺, Cr⁶⁺, Cd²⁺, and Pb²⁺) in the chemically activated luciferase expression (CALUX) of H1L6.1 cells. The observed data revealed that Cr⁶⁺ exerted a significant inhibiting effect on the luciferase activity. The impact of key metal species at various concentrations was analyzed for determination of the maximum tolerable level for H1L6.1 cell. It was observed that Cr⁶⁺ lowered the luciferase activity by 36.1 and 65.4%, at levels of 1.0 and 1.5 μg-Cr/mL-medium (p < 0.05), respectively, but showed no significant difference at higher Cr⁶⁺concentrations (2.0-5.0 μg-Cr/mL-medium).