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- W2005592012 abstract "Abstract Genotoxicity assays were conducted on rats treated with benzo[ a ]pyrene (BaP) as part of Stage III of a validation study on the Pig‐a gene mutation assay. Assays were performed at the U.S. FDA‐NCTR and Bayer‐Germany. Starting on Day 1, groups of five 6‐ to 7‐week‐old male Fischer 344 (F344, used at FDA‐NCTR) and Han Wistar rats (Bayer) were given 28 daily doses of 0, 37.5, 75, or 150 mg/kg BaP; blood was sampled on Days −1, 4, 15, 29, and 56. Pig‐a mutant frequencies were determined on Days −1, 15, 29, and 56 in total red blood cells (RBCs) and reticulocytes (RETs) as RBC CD59− and RET CD59− frequencies; percent micronucleated‐RETs (%MN‐RET) were measured on Days 4 and 29. RBC CD59− and RET CD59− frequencies increased in a dose‐ and time‐dependent manner, producing significant increases by Day 29 in both rat models. The responses for RETs were stronger than those for RBCs, and the responses in F344 rats were stronger than in Han Wistar rats. BaP also produced significant increases in %MN‐RET frequency at Days 4 and 29, with the responses being greater in F344 than Han Wistar rats. The overall findings were consistent with those of the reference laboratory using Han Wistar rats. Finally, mutation assays performed on splenocytes from Day 56 F344 rats indicated that BaP mutant frequencies were three to fivefold higher for the Hprt gene than the Pig‐a gene. The results indicate that the Pig‐a RET and RBC assays are reproducible, transferable, and show promise for integrating gene mutation into 28‐day repeat‐dose studies. Environ. Mol. Mutagen. 2011. © 2011 Wiley‐Liss, Inc." @default.
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- W2005592012 date "2011-08-29" @default.
- W2005592012 modified "2023-10-17" @default.
- W2005592012 title "Report on stage III Pig-a mutation assays using benzo[a]pyrene" @default.
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- W2005592012 doi "https://doi.org/10.1002/em.20675" @default.
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