Oral carcinogenicity study with nickel sulfate hexahydrate in Fischer 344 rats

Journal Article · Mon Oct 15 04:00:00 EDT 2007 · Toxicology and Applied Pharmacology

DOI:https://doi.org/10.1016/j.taap.2007.06.024· OSTI ID:21077820

Heim, Katherine E; Bates, Hudson K ^[1]; Rush, Rusty E ^[2]

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1. NiPERA, 2605 Meridian Parkway, Suite 200, Durham, NC 27713 (United States)
2. Charles River Laboratories, Preclinical Services-Ohio, 640 North Elizabeth St. Spencerville, OH 45887 (United States)

Until now, existing data on the oral carcinogenicity of nickel substances have been inconclusive. Yet, the assessment of oral carcinogenicity of nickel has serious scientific and regulatory implications. In the present study, nickel sulfate hexahydrate was administered daily to Fischer 344 rats by oral gavage for 2 years (104 weeks) at exposure levels of 10, 30 and 50 mg NiSO{sub 4}{center_dot}6H{sub 2}O/kg. This treatment produced a statistically significant reduction in body weight of male and female rats, compared to controls, in an exposure-related fashion at 30 and 50 mg/kg/day. An exposure-dependent increase in mortality was observed in female rats. However, the overall study survival rate (males and females) was at least 25 animals per group (compliant with OECD guidelines) in the treated animals. Daily oral administration of nickel sulfate hexahydrate did not produce an exposure-related increase in any common tumor type or an increase in any rare tumors. One tumor type was statistically increased in a nickel sulfate-treated group compared to the study controls (keratoacanthoma in the 10 mg NiSO{sub 4}{center_dot}6H{sub 2}O/kg/day males), but there was no exposure-response relationship for this common tumor type. This study achieved sufficient toxicity to reach the Maximum Tolerated Dose (MTD) while maintaining a sufficiently high survival rate to allow evaluation for carcinogenicity. The present study indicated that nickel sulfate hexahydrate does not have the potential to cause carcinogenicity by the oral route of exposure in the Fischer 344 rat. Data from this and other studies demonstrate that inhalation is the only route of exposure that might cause concern for cancer in association with nickel exposures.

• OSTI ID: 21077820
• Journal Information: Toxicology and Applied Pharmacology, Journal Name: Toxicology and Applied Pharmacology Journal Issue: 2 Vol. 224; ISSN TXAPA9; ISSN 0041-008X
• Country of Publication: United States
• Language: English

Related Subjects

60 APPLIED LIFE SCIENCES
EVALUATION
INHALATION
MORTALITY
NEOPLASMS
NICKEL
NICKEL SULFATES
ORAL ADMINISTRATION
RATS
RECOMMENDATIONS
TOXICITY