PMID: 9537280Apr 16, 1998Paper

Differences in the extent of inflammation caused by intratracheal exposure to three ultrafine metals: role of free radicals

Journal of Toxicology and Environmental Health. Part a
Q ZhangK Donaldson

Abstract

Nickel and cobalt, which belong to the same elemental group, are known to cause interstitial lung disease and bronchial asthma. The ability of these metals to injure lung cells and cause inflammation is likely to be important in their pathogenicity but comparative studies are rare. Additionally, ultrafine (uf) forms of these metals are used increasingly and there is little available information on their toxicity. Thus the inflammatory response following intratracheal instillation of ultrafine particles of Co, Ni, and TiO2 was compared. Physiological saline (PS) was used as a vehicle control and DQ12 quartz as a positive control. Male Wistar rats were intratracheally instilled with the 3 particle types at a dose of 1 mg suspended in physiological saline. At 1, 3, 7, 15, and 30 d after the injection, lung weight and the cellular and biochemical changes in bronchoalveolar lavage fluid (BALF) were determined. By all of the indices, Uf-Ni appeared to be the most injurious to the lung, causing severe and sustained inflammation, cytotoxicity and increased epithelial permeability. The next most toxic material was DQ12 quartz, with Uf-Co being closely similar in ability to cause inflammation. Uf-TiO2 was more active than the saline cont...Continue Reading

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