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Thakkar Y, Moustakas H, Moelijker N, Hendriks G, Brandsma I, Pfuhler S, Api AM. Utility of ToxTracker in animal alternative testing strategy for fragrance materials. ENVIRONMENTAL AND MOLECULAR MUTAGENESIS 2023; 64:234-243. [PMID: 36762970 DOI: 10.1002/em.22532] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2022] [Revised: 01/23/2023] [Accepted: 01/31/2023] [Indexed: 05/03/2023]
Abstract
To determine the utility of the ToxTracker assay in animal alternative testing strategies, the genotoxic potential of four fragrance materials (2-octen-4-one, lauric aldehyde, veratraldehyde, and p-methoxy cinnamaldehyde) were tested in the ToxTracker assay. These materials have been previously evaluated in an in vitro as well as in vivo micronucleus assay, conducted as per OECD guidelines. In addition to these studies, reconstructed human skin micronucleus studies were conducted on all four materials. All four materials were positive in an in vitro micronucleus assay but were negative in both in vivo and 3D skin micronucleus assays. The ToxTracker assay, in combination with in silico methods to predict metabolism was used to identify mechanisms for the misleading positive outcomes observed in the in vitro micronucleus assays. The results show that the ToxTracker assay, in conjunction with in silico predictions, can provide the information needed to aid in the identification of an appropriate animal alternative follow-up assay, for substances with positive results in the standard in vitro test battery. Thus, the ToxTracker assay is a valuable tool to identify the genotoxic potential of fragrance materials and can aid with replacing animal-based follow-up testing with appropriate animal alternative assay(s).
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Affiliation(s)
- Yax Thakkar
- Research Institute for Fragrance Materials, Inc, Woodcliff Lake, New Jersey, USA
| | - Holger Moustakas
- Research Institute for Fragrance Materials, Inc, Woodcliff Lake, New Jersey, USA
| | | | | | | | - Stefan Pfuhler
- The Procter & Gamble Company, Mason Business Centre, Mason, Ohio, USA
| | - Anne Marie Api
- Research Institute for Fragrance Materials, Inc, Woodcliff Lake, New Jersey, USA
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Kowalczyk K, Roszak J, Sobańska Z, Stępnik M. Review of mechanisms of genotoxic action of dibenzo[def,p]chrysene (formerly dibenzo[a,l]pyrene). TOXIN REV 2022. [DOI: 10.1080/15569543.2022.2124419] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
Affiliation(s)
| | - J. Roszak
- Department of Translational Research, Nofer Institute of Occupational Medicine, Łódź, Poland
| | - Z. Sobańska
- Department of Translational Research, Nofer Institute of Occupational Medicine, Łódź, Poland
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Mišík M, Nersesyan A, Ferk F, Holzmann K, Krupitza G, Herrera Morales D, Staudinger M, Wultsch G, Knasmueller S. Search for the optimal genotoxicity assay for routine testing of chemicals: Sensitivity and specificity of conventional and new test systems. MUTATION RESEARCH. GENETIC TOXICOLOGY AND ENVIRONMENTAL MUTAGENESIS 2022; 881:503524. [PMID: 36031336 DOI: 10.1016/j.mrgentox.2022.503524] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/13/2022] [Revised: 06/15/2022] [Accepted: 06/28/2022] [Indexed: 06/15/2023]
Abstract
Many conventional in vitro tests that are currently widely used for routine screening of chemicals have a sensitivity/specificity in the range between 60 % and 80 % for the detection of carcinogens. Most procedures were developed 30-40 years ago. In the last decades several assays became available which are based on the use of metabolically competent cell lines, improvement of the cultivation conditions and development of new endpoints. Validation studies indicate that some of these models may be more reliable for the detection of genotoxicants (i.e. many of them have sensitivity and specificity values between 80 % and 95 %). Therefore, they could replace conventional tests in the future. The bone marrow micronucleus (MN) assay with rodents is at present the most widely used in vivo test. The majority of studies indicate that it detects only 5-6 out of 10 carcinogens while experiments with transgenic rodents and comet assays seem to have a higher predictive value and detect genotoxic carcinogens that are negative in MN experiments. Alternatives to rodent experiments could be MN experiments with hen eggs or their replacement by combinations of new in vitro tests. Examples for promising candidates are ToxTracker, TGx-DDI, multiplex flow cytometry, γH2AX experiments, measurement of p53 activation and MN experiments with metabolically competent human derived liver cells. However, the realization of multicentric collaborative validation studies is mandatory to identify the most reliable tests.
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Affiliation(s)
- M Mišík
- Center for Cancer Research, Medical University of Vienna, Borschkegasse 8a, A-1090 Vienna, Austria
| | - A Nersesyan
- Center for Cancer Research, Medical University of Vienna, Borschkegasse 8a, A-1090 Vienna, Austria
| | - F Ferk
- Center for Cancer Research, Medical University of Vienna, Borschkegasse 8a, A-1090 Vienna, Austria
| | - K Holzmann
- Center for Cancer Research, Medical University of Vienna, Borschkegasse 8a, A-1090 Vienna, Austria
| | - G Krupitza
- Department of Pathology, Medical University of Vienna, A-1090 Vienna, Austria
| | - D Herrera Morales
- Center for Cancer Research, Medical University of Vienna, Borschkegasse 8a, A-1090 Vienna, Austria
| | - M Staudinger
- Center for Cancer Research, Medical University of Vienna, Borschkegasse 8a, A-1090 Vienna, Austria
| | - G Wultsch
- Center for Cancer Research, Medical University of Vienna, Borschkegasse 8a, A-1090 Vienna, Austria
| | - S Knasmueller
- Center for Cancer Research, Medical University of Vienna, Borschkegasse 8a, A-1090 Vienna, Austria.
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Maul K, Fieblinger D, Heppenheimer A, Kreutz J, Liebsch M, Luch A, Pirow R, Poth A, Strauch P, Dony E, Schulz M, Wolf T, Reisinger K. Validation of the hen's egg test for micronucleus induction (HETMN): Detailed protocol including scoring atlas, historical control data and statistical analysis. Mutagenesis 2021; 37:76-88. [PMID: 34313790 PMCID: PMC9071076 DOI: 10.1093/mutage/geab026] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2021] [Accepted: 08/03/2021] [Indexed: 11/14/2022] Open
Abstract
A validation exercise of the hen's egg test for micronucleus induction (HET-MN) was finalised with a very good predictivity based on the analysis of micronuclei in peripheral erythrocytes of fertilised chicken eggs [1]. For transparency reasons this complementary publication provides further details on the assay especially as this was the first validation study in the field of genotoxicity testing involving the use of chicken eggs. Thus, the experimental protocol is described in detail and is complemented by a scoring atlas for microscopic analysis of blood cells. In addition, general characteristics of the test system, which is able to mirror the systemic availability of test compounds, are delineated: the test compound passes the egg membrane and is taken up by the blood vessels of the underlying chorioallantoic membrane. Subsequently, it is distributed by the circulating blood, metabolised by the developing liver and the yolk sac membrane, and finally excreted into the allantois, a bladder equivalent. In specific, the suitability of the test system for genotoxicity testing is shown by, inter alia, a low background DNA damage in a comprehensive historical control database. In addition, the state-of-the-art statistical method used to evaluate obtained data is delineated. It combines laboratory-specific effect threshold with the Umbrella-Williams test a statistical model also of interest for other genotoxicity test methods.
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Affiliation(s)
- K Maul
- German Federal Institute for Risk Assessment (BfR), Department of Chemical and Product Safety, Berlin, Germany
| | - D Fieblinger
- German Federal Institute for Risk Assessment (BfR), Department of Chemical and Product Safety, Berlin, Germany
| | - A Heppenheimer
- ICCR-Roßdorf GmbH (former: Harlan Cytotest Cell Research, Envigo CRS), Roßdorf, Germany
| | - J Kreutz
- Henkel AG & Co KGaA, Duesseldorf, Germany
| | - M Liebsch
- German Federal Institute for Risk Assessment (BfR), Department of Chemical and Product Safety, Berlin, Germany
| | - A Luch
- German Federal Institute for Risk Assessment (BfR), Department of Chemical and Product Safety, Berlin, Germany
| | - R Pirow
- German Federal Institute for Risk Assessment (BfR), Department of Chemical and Product Safety, Berlin, Germany
| | - A Poth
- ICCR-Roßdorf GmbH (former: Harlan Cytotest Cell Research, Envigo CRS), Roßdorf, Germany
| | - P Strauch
- ICCR-Roßdorf GmbH (former: Harlan Cytotest Cell Research, Envigo CRS), Roßdorf, Germany
| | - E Dony
- ICCR-Roßdorf GmbH (former: Harlan Cytotest Cell Research, Envigo CRS), Roßdorf, Germany
| | - M Schulz
- ICCR-Roßdorf GmbH (former: Harlan Cytotest Cell Research, Envigo CRS), Roßdorf, Germany
| | - T Wolf
- University of Osnabrueck, Osnabrueck, Germany
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