Further development of the rat Pig‐a mutation assay: Measuring rat Pig‐a mutant bone marrow erythroids and a high throughput assay for mutant peripheral blood reticulocytes
- 5 October 2011
- journal article
- research article
- Published by Wiley in Environmental and Molecular Mutagenesis
- Vol. 52 (9), 774-783
- https://doi.org/10.1002/em.20677
Abstract
Recent studies indicate that the Pig‐a assay is a promising tool for evaluating in vivo mutagenicity. We have developed novel rat Pig‐a assays that facilitate measuring mutant frequencies in two early arising populations of blood cells, bone marrow erythroids (BMEs) and peripheral blood (PB) reticulocytes (RETs). In these assays, bone marrow cells of erythroid origin and PB red blood cells (RBCs) were identified using an antibody against rat erythroid‐specific marker HIS49. In addition, RETs were selectivity enriched from PB using magnetic separation of cells positive for CD71, a transferrin receptor expressed on the surface of BMEs and RETs, but not on the surface of mature RBCs. With magnetic enrichment, more than 1 × 106 CD71‐positive RETs could be evaluated by flow cytometry for Pig‐a mutant frequency within 5 to 8 min. CD59‐deficient RET and BME frequencies of more than 100 × 10−6 and 80 × 10−6 were detected 1 week after treating rats with 40 mg/kg N‐ethyl‐N‐nitrosourea; by comparison, the frequency of CD59‐deficient total RBCs in these rats was 13.2 × 10−6. The frequency of spontaneous Pig‐a mutant RETs and BMEs was less than 5 × 10−6 and 15 × 10−6, respectively. Since ∼98% of nucleated cells in the BME fraction were erythroblasts, it should be possible to use BMEs to determine the spectrum of CD59‐deficient Pig‐a mutations in cells of erythroid lineage. Conducting concurrent Pig‐a assays on RETs and BMEs may be useful for evaluating the in vivo mutagenicity of chemicals, especially when prolonged mutant manifestation is not feasible or when the confirmation of mutation induction is necessary. © Environ. Mol. Mutagen. 2011. Published 2011 Wiley‐Liss, Inc.Keywords
This publication has 18 references indexed in Scilit:
- Analysis of mutations in the Pig‐a gene of spleen T‐cells from N‐ethyl‐N‐nitrosourea‐treated fisher 344 ratsEnvironmental and Molecular Mutagenesis, 2011
- When pigs fly: Immunomagnetic separation facilitates rapid determination of Pig-a mutant frequency by flow cytometric analysisMutation Research/Genetic Toxicology and Environmental Mutagenesis, 2011
- The in vivo pig‐a gene mutation assay, a potential tool for regulatory safety assessmentEnvironmental and Molecular Mutagenesis, 2010
- Integration of Mutation and Chromosomal Damage Endpoints into 28-Day Repeat Dose Toxicology StudiesToxicological Sciences, 2010
- Pig-a Mutation: Kinetics in Rat Erythrocytes Following Exposure to Five Prototypical MutagensToxicological Sciences, 2009
- Flow cytometric detection of Pig‐A mutant red blood cells using an erythroid‐specific antibody: Application of the method for evaluating the in vivo genotoxicity of methylphenidate in adolescent ratsEnvironmental and Molecular Mutagenesis, 2009
- Erythrocyte-based Pig-a gene mutation assay: Demonstration of cross-species potentialMutation Research/Genetic Toxicology and Environmental Mutagenesis, 2008
- Development of an in vivo gene mutation assay using the endogenous Pig‐A gene: II. Selection of Pig‐A mutant rat spleen T‐cells with proaerolysin and sequencing Pig‐A cDNA from the mutantsEnvironmental and Molecular Mutagenesis, 2008
- Development of an in vivo gene mutation assay using the endogenous Pig‐A gene: I. Flow cytometric detection of CD59‐negative peripheral red blood cells and CD48‐negative spleen T‐cells from the ratEnvironmental and Molecular Mutagenesis, 2008
- A simple assay for frequency of chromosome breaks and loss (micronuclei) by flow cytometry of human reticulocytesThe FASEB Journal, 2004