Role of tumor necrosis factor-alpha in cadmium-induced hepatotoxicity

Toxicology and Applied Pharmacology
F KayamaM I Luster

Abstract

Liver and kidney injury following acute or chronic exposure to cadmium is well characterized. While hepatocytes and endothelial cells of the sinusoids are thought to be the primary cellular targets in the liver, ultrastructural changes may vary depending upon the exposure regimen and the time following administration. Since acute and chronic liver disease is often associated with the presence of cytokines, we investigated the role of proinflammatory cytokines in cadmium-induced hepatotoxicity. Supernatants from cultured liver slices obtained from acute or subchronic cadmium-exposed rats and mice were collected and cytokine secretion was examined. In addition, mRNA transcripts for IL-1 alpha, IL-1 beta, IL-6, TNF-alpha, MIP-2, IFN-gamma, and ICAM-1 from livers of treated mice were quantitated by reverse transcription-polymerase chain reaction. Modest increases in secretion of TNF-alpha, IL-1 alpha, and IL-6 were observed in response to cadmium which were enhanced in LPS-primed mice. Additionally, cadmium exposure increased IL-1 alpha, IL-1 beta, TNF-alpha, MIP-2, IL-6, and ICAM-1 mRNA transcripts in the liver. Immunohistochemical analysis revealed that TNF-alpha was associated with nonparenchymal cells in livers of cadmium-treat...Continue Reading

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