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Based on the classical observation that catalase activity is reduced in the liver of a tumor bearing host, we studied this phenomenon from the aspect of gene expression. Northern blot analysis on the livers of mice with a rat tumor showed that the catalase gene expression is lowered in a tumor size-dependent fashion. Decreased gene expression was also seen irrespective of tissue or species origin of tumors transplanted. Removal of the implanted tumor resulted in restoration of the reduced gene message to the normal level. The tumor effect on the catalase gene expression was shown to be controlled at the transcriptional level. These results strongly suggest that the reduction of liver catalase activity in the tumor bearer may be due to down regulation of the catalase gene induced in the liver by a certain humoral factor(s) from the transplanted tumor.
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