Studies on lipid peroxidation in rat tissues following administration of low and moderate doses of cadmium chloride.

The susceptibility to lipid peroxidation (LPO) of liver, kidneys, brains, lungs, heart, and testes was assessed in rats administered intraperitoneally with various doses of cadmium (Cd). Dose-response studies were carried out with male Long Evans rats (12-week-old; 300 +/- 33 g) injected with 25, 125, 500, and 1250 micrograms Cd/kg as CdCl2 and sacrificed after 24 h. In time-response studies, animals were administered with 25 and 500 micrograms Cd/kg as CdCl2 and sacrificed after 2, 6, 12, 24, and 72 h. Exposure of rats to low and moderate doses of Cd by the intraperitoneal route stimulated LPO in all the tissues investigated as assessed by the measurement of thiobarbituric acid reactive substances (TBARS). Lungs and brain were the most responsive, and these tissues and liver displayed early responses following Cd exposure. Comparison of LPO to various tissue indicators (for liver: alanine aminotransferase (ALT), sorbitol dehydrogenase (SDH), alkaline phosphatase (ALP); for lungs: ALP, gamma-glutamyl transpeptidase (GGT] suggested that low doses of Cd stimulated LPO without any evidence of acute damages. These results suggest that LPO is an early and sensitive consequence of Cd exposure as determined in various organs. Investigation of liver, lungs, and heart antioxidant defense system components (glutathione peroxidase (GPX), glutathione reductase (GR), glucose-6-phosphate dehydrogenase (G6PDH), superoxide dismutase (SOD] revealed that GPX might be considered as a potential modulator of the Cd-induced LPO reaction in lungs and heart tissues.

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