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The effect of the carcinogen 3-methylcholanthrene (MCA) on protein accumulation in mouse tissues was examined. Administration of the hydrocarbon (250 mg/kg, intraperitoneally) to high-responder C57BL/6 (B6) mice resulted in the induction of five proteins in liver tissue. Quantitative analysis revealed that maximal induction of all five proteins occurred 2 days after MCA administration, with liver protein concentrations returning close to control values by 7 days after the treatment. No consistent effects on the concentrations of other liver proteins were seen. Cell-fractionation studies demonstrate that these proteins appear to be non-microsomal in origin. The induction of the five proteins was tissue-specific, since MCA had no effect on protein accumulation in the B6-mouse kidney, spleen or heart. In addition, their induction appeared to be correlated with the Ah locus, since MCA administration had no effect on the concentrations of the five proteins in the liver of the low-responder DBA/2 (D2) mouse strain. Comparing the extent and time course of this induction with that of previously characterized MCA-induced enzymes, we suggest that these five proteins may represent a new, previously unidentified, set of MCA-induced proteins.

The Ah domain of the mouse. Induction of proteins by the carcinogen 3-methylcholanthrene