Classification of test agent-specific effects in the Syrian hamster embryo assay (pH 6.7) using infrared spectroscopy with computational analysis

The Syrian hamster embryo (SHE) cell transformation assay (pH 6.7) has utility in the assessment of potential chemical carcinogenicity (both genotoxic and non-genotoxic mechanisms of action). The assay uses morphological transformation as an end point and has a reported sensitivity of 87%, specifici...

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Bibliographic Details
Published in:Mutagenesis Vol. 27; no. 3; p. 375
Main Authors: Ahmadzai, Abdullah A, Trevisan, Júlio, Pang, Weiyi, Patel, Imran I, Fullwood, Nigel J, Bruce, Shannon W, Pant, Kamala, Carmichael, Paul L, Scott, Andrew D, Martin, Francis L
Format: Journal Article
Language:English
Published: England 01.05.2012
Subjects:
Animals
Biomarkers - metabolism
Carcinogens - classification
Carcinogens - toxicity
Cell Transformation, Neoplastic
Cells, Cultured
Cricetinae
Data Interpretation, Statistical
Embryo, Mammalian - cytology
Hydrogen-Ion Concentration
Linear Models
Mesocricetus
Mutagenicity Tests - methods
Mutagens - classification
Mutagens - toxicity
Spectroscopy, Fourier Transform Infrared
ISSN:1464-3804, 1464-3804
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Summary:The Syrian hamster embryo (SHE) cell transformation assay (pH 6.7) has utility in the assessment of potential chemical carcinogenicity (both genotoxic and non-genotoxic mechanisms of action). The assay uses morphological transformation as an end point and has a reported sensitivity of 87%, specificity of 83% and overall concordance of 85% with in vivo rodent bioassay data. However, the scoring of morphologically transformed SHE cells is subjective. We treated SHE cells grown on low-E reflective slides with benzo[a]pyrene, 3-methylcholanthrene, anthracene, N-nitroso-N-methylnitroguanidine, ortho-toluidine HCl, 2,4-diaminotoluene or D-mannitol for 7 days before fixation with methanol. Identified colonies were interrogated by acquiring a minimum of five infrared (IR) spectra per colony using attenuated total reflection Fourier-transform IR spectroscopy. Individual IR spectra were acquired over a spatial area of approximately 250 × 250 μm. Resultant data were analysed using Fisher's linear discriminant analysis and feature histogram algorithms to extract classifying biomarkers of test agent-specific effects or transformation in SHE cells. Clustering of spectral points suggested co-segregation or discrimination of test agent categories based on mechanism of action. Towards transformation, unifying alterations were associated with alterations in the Amide I and Amide II peaks; these were consistently major classifying biomarkers for transformed versus non-transformed SHE cells. Our approach highlights a novel method towards objectively screening and classifying SHE cells, be it to ascertain test agent treatment based on mechanism of action or transformation.
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ISSN:1464-3804
1464-3804
DOI:10.1093/mutage/ges003