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Tinwell H, Karmaus A, Gaskell V, Gomes C, Grant C, Holmes T, Jonas A, Kellum S, Krüger K, Malley L, Melching-Kollmuss S, Mercier O, Pandya H, Placke T, Settivari R, De Waen B. Evaluating H295R steroidogenesis assay data for robust interpretation. Regul Toxicol Pharmacol 2023; 143:105461. [PMID: 37490962 DOI: 10.1016/j.yrtph.2023.105461] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2023] [Revised: 06/22/2023] [Accepted: 07/21/2023] [Indexed: 07/27/2023]
Abstract
The in vitro H295R steroidogenesis assay (OECD TG 456) is used to determine a chemical's potential to interfere with steroid hormone synthesis/metabolism. As positive outcomes in this assay can trigger significant higher tiered testing, we compiled a stakeholder database of reference and test item H295R data to characterize assay outcomes. Information concerning whether a Level 5 reproductive toxicity study was triggered due to a positive outcome in the H295R assay was also included. Quality control acceptance criteria were not always achieved, suggesting this assay is challenging to conduct within the guideline specifications. Analysis of test item data demonstrated that pairwise significance testing to controls allowed for overly sensitive statistically significant positive outcomes, which likely contribute to the assay's high positive hit rate. Complementary interpretation criteria (e.g., 1.5-fold change threshold) markedly reduced the rate of equivocal and positive outcomes thus improving identification of robust positive effects in the assay. Finally, a case study (positive H295R outcome and no endocrine adversity in vivo) is presented, which suggests that stricter data interpretation criteria could refine necessary in vivo follow-up testing. Overall, the described additional criteria could improve H295R data interpretation and help inform on how to best leverage this assay for regulatory purposes.
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Affiliation(s)
- H Tinwell
- Bayer SAS, 16 Rue Jean-Marie Leclair, 69009, Lyon, France.
| | - A Karmaus
- Inotiv, 601 Keystone Park Drive, Morrisville, NC, 27560, United States
| | - V Gaskell
- Nufarm UK Ltd, Wyke Lane, Bradford, BD12 9EJ, UK
| | - C Gomes
- BASF SE, Experimental Toxicology and Ecology, Carl-Bosch-Strasse 38, 67056, Ludwigshafen, Germany
| | - C Grant
- Regulatory Science Associates, Kip Marina, Inverkip, Renfrewshire, PA16 OAS, UK
| | - T Holmes
- ADAMA Deutschland GmbH, Edmund-Rumpler-Str. 651149, Koeln (Cologne), Germany
| | - A Jonas
- Sumitomo Chemical Agro Europe, Parc D'Affaires de Crécy, 10A Rue de La Voie Lactée, 69370, Saint Didier Au Mont D'Or, France
| | - S Kellum
- Corteva Agriscience, Haskell R&D Center, 1090 Elkton Rd, Bldg 320, Newark, DE, 19711, USA
| | - K Krüger
- HELM AG, Nordkanalstrasse 28, 20097, Hamburg, Germany
| | - L Malley
- FMC, Stine Research Center, 1090 Elkton Road, Newark, DE, 19711, USA
| | | | - O Mercier
- Sumitomo Chemical Agro Europe, Parc D'Affaires de Crécy, 10A Rue de La Voie Lactée, 69370, Saint Didier Au Mont D'Or, France
| | - H Pandya
- UPL Limited, Mumbai, 400051, India
| | - T Placke
- Syngenta, Rosentalstrasse 67, CH-4058 Basel, Switzerland
| | - R Settivari
- Corteva Agriscience, Haskell R&D Center, 1090 Elkton Rd, Bldg 320, Newark, DE, 19711, USA
| | - B De Waen
- ISK, De Kleetlaan 12b, 1831, Machelen, Belgium
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