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• W1966183796 abstract "Chronic exposure to inhaled cadmium (Cd) has been shown to induce lung tumors in rats (Wistar strain) but not in mice (NMRI strain). The protein metallothionein (MT) plays an important role in Cd detoxification, and it has been suggested that differential inducibility of pulmonary MT may lead to interspecies susceptibility differences to inhaled Cd. Interstrain differences in the pulmonary response of the MT gene to Cd stimuli have not been examined in rats or mice. We compared pulmonary MT expression in Wistar Furth (WF) rats with that in DBA and C57 mice, following a single 3-h exposure to CdO fumes containing 1 mg Cd/m3. Induction of the MT gene was assessed by the levels of MT-I and MT-II transcripts, MT–protein content, and number of MT-labeled alveolar and bronchiolar epithelial cells immediately after Cd exposure and 1, 3, and 5 days later. Control animals were exposed to air/argon furnace gases. We observed differential intra- and interspecies inducibility of the MT gene in the lung following Cd inhalation. DBA mice exhibited greater levels of MT-mRNA, mainly for the MT-I isoform, MT–protein content, and number of MT positive cells relative to C57 mice. WF rats showed lower transcription and translation responses of the MT gene upon Cd stimuli than C57 mice. The present results, in concert with our previous findings of higher lung cell proliferation in Cd-exposed C57 relative to DBA mice, predict greater susceptibility of C57 to the carcinogenic effects of inhaled Cd. Furthermore, the low transcriptional and translation responses of the MT gene to Cd stimuli in WF rats might explain the higher susceptibility of this rat strain to develop malignant lung tumors after chronic exposure to Cd via inhalation. Parallel to our findings in mice, differences in the responsiveness of lung MT gene may exist across rat strains. Thus intraspecies genetic variability in pulmonary MT may influence the susceptibility of rats or mice to lung carcinogenesis induced by inhalation of Cd compounds." @default.
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• W1966183796 date "1998-12-01" @default.
• W1966183796 modified "2023-10-16" @default.
• W1966183796 title "Expression of Metallothionein Protein in the Lungs of Wistar Rats and C57 and DBA Mice Exposed to Cadmium Oxide Fumes" @default.
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• W1966183796 doi "https://doi.org/10.1006/taap.1998.8399" @default.
• W1966183796 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/9878588" @default.
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