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Metallothionein and heat shock protein 70 (HSP70) are stress proteins involved in response to different stimuli. In the present study rats were administered per oral application by gavage, a single daily dose (0.1 mg\/kg) of HgCl<jats:sub>2<\/jats:sub> for 3 consecutive days. To find a relation between these two stress proteins and mercury, parameters of liver injury, redox state of the cells, and the expression and protein levels of HSP70 and metallothionein by Northern and Western blot analysis were assayed either in blood or in liver. HgCl<jats:sub>2<\/jats:sub> at the doses of 0.1 mg\/kg induced liver injury detected by a slight increase in serum aspartate aminotransferase and alkaline phosphatase activities and by the enhanced levels of bilirubin. Oxidative stress was detected by a significant decrease in protein\u2013SH and an increase in thiobarbituric acid reactive substances in liver following one dose of mercury. mRNA and protein levels of both metallothionein and HSP70 increased progressively from first to third doses of mercury. We conclude that against low doses of mercury that produce a slight liver injury and oxidative stress, the liver rapidly responds by inducing the expression of metallothionein and HSP70. We suggest that metallothionein induction attenuates the decrease in protein\u2013SH induced by the first dose of mercury, since metallothionein increases the pool of thiol groups in the cytosol eliminating oxygen radicals and inhibiting lipid peroxidation. From these results we can suggest that the changes observed in these stress proteins by the effect of mercury appear to be a response rapidly induced at transcriptional and at translational levels. \u00a9 2003 Wiley Periodicals, Inc. J Biochem Mol Toxicol 17:161\u2013168, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). 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