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Supplemental files for Respirometric Screening and Characterization of Mitochondrial Toxicants Within the ToxCast Phase I and II Chemical Libraries
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These are the supplemental files for TOXSCI manuscript 19-0578 entitled, “Respirometric Screening and Characterization of Mitochondrial Toxicants Within the ToxCast Phase I and II Chemical Libraries”:
Supplemental Figure 1 shows the median fold inhibition for basal (A) and maximal (B) respiration phases for nine test chemicals represented as 18 internally-duplicated samples used to measure intra-assay reproducibility (red dashed lines show threshold used to define bioactivity).
Supplemental Figure 2 shows the temporal dose-response plots (median % initial respiration ± mad) for all 243 chemicals tested in Tier 2 RSA screening.
Supplemental Figure 3 shows the temporal dose-response plots (median % initial respiration ± mad) for all 149 ETCi chemicals tested in the EFA.
Supplemental Table 1 lists five QC metrics calculated using DMSO, fenpyroximate, and 2,4-dinitrophenol controls used to evaluate RSA performance.
Supplemental Table 2 lists the 1,042 ToxCast chemicals tested in this study with activity calls for each testing tier, proposed mechanism of mitochondrial toxicity for RSA-actives and the inhibited respiratory complex(es) for putative ETC inhibitors. Maximal test concentrations are in µM excepting those values exceeding 200, which are in µg/µL.
Supplemental File A delineates how the respirometric screening assay protocol differs from the commonly-used mitochondrial stress assay protocol and provides a rationale for those differences.