Grouping of UVCB substances with new approach methodologies (NAMs) data

John S. House, Fabian A. Grimm, William D. Klaren, Abigail Dalzell, Srikeerthana Kuchi, Shu-Dong Zhang, Klaus Lenz, Peter Boogaard, Hans B. Ketelslegers, Timothy W. Gant, Fred A. Wright, Ivan Rusyn

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)
45 Downloads (Pure)


One of the most challenging areas in regulatory science is assessment of the substances known as UVCB (unknown or variable composition, complex reaction products and biological materials). Because the inherent complexity and variability of UVCBs present considerable challenges for establishing sufficient substance similarity based on chemical characteristics or other data, we hypothesized that new approach methodologies (NAMs), including in vitro test-derived biological activity signatures to characterize substance similarity, could be used to support grouping of UVCBs. We tested 141 petroleum substances as representative UVCBs in a compendium of 15 human cell types representing a variety of tissues. Petroleum substances were assayed in dilution series to derive point of departure estimates for each cell type and phenotype. Extensive quality control measures were taken to ensure that only high-confidence in vitro data were used to determine whether current groupings of these petroleum substances, based largely on the manufacturing process and physico-chemical properties, are justifiable. We found that bioactivity data-based groupings of petroleum substances were generally consistent with the manufacturing class-based categories. We also showed that these data, especially bioactivity from human induced pluripotent stem cell (iPSC)-derived and primary cells, can be used to rank substances in a manner highly concordant with their expected in vivo hazard potential based on their chemical compositional profile. Overall, this study demonstrates that NAMs can be used to inform groupings of UVCBs, to assist in identification of repre­sentative substances in each group for testing when needed, and to fill data gaps by read-across.

Original languageEnglish
Pages (from-to)123-137
Number of pages15
JournalALTEX - Alternatives to Animal Experimentation
Issue number1
Early online date9 Oct 2020
Publication statusPublished (in print/issue) - 12 Jan 2021

Bibliographical note

This record is sourced from MEDLINE/PubMed, a database of the U.S. National Library of Medicine


  • petroleum IPSC in vitro


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