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Chem Res Toxicol
2016 May 16;295:924-32. doi: 10.1021/acs.chemrestox.6b00076.
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Perfluoroalkylated Substance Effects in Xenopus laevis A6 Kidney Epithelial Cells Determined by ATR-FTIR Spectroscopy and Chemometric Analysis.
Gorrochategui E
,
Lacorte S
,
Tauler R
,
Martin FL
.
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The effects of four perfluoroalkylated substances (PFASs), namely, perfluorobutanesulfonate (PFBS), perfluorooctanoic acid (PFOA), perfluorooctanesulfonate (PFOS), and perfluorononanoic acid (PFNA) were assessed in Xenopus laevis A6 kidney epithelial cells by attenuated total reflection Fourier-transform infrared (ATR-FTIR) spectroscopy and chemometric analysis. Principal component analysis-linear discriminant analysis (PCA-LDA) was used to visualize wavenumber-related alterations and ANOVA-simultaneous component analysis (ASCA) allowed data processing considering the underlying experimental design. Both analyses evidenced a higher impact of low-dose PFAS-treatments (10(-9) M) on A6 cells forming monolayers, while there was a larger influence of high-dose PFAS-treatments (10(-5) M) on A6 cells differentiated into dome structures. The observed dose-response PFAS-induced effects were to some extent related to their cytotoxicity: the EC50-values of most influential PFAS-treatments increased (PFOS < PFNA < PFOA ≪ PFBS), and higher-doses of these chemicals induced a larger impact. Major spectral alterations were mainly attributed to DNA/RNA, secondary protein structure, lipids, and fatty acids. Finally, PFOS and PFOA caused a decrease in A6 cell numbers compared to controls, whereas PFBS and PFNA did not significantly change cell population levels. Overall, this work highlights the ability of PFASs to alter A6 cells, whether forming monolayers or differentiated into dome structures, and the potential of PFOS and PFOA to induce cell death.
Figure 1. Schematic representation
of Xenopus laevis A6
kidney epithelial cells forming a monolayer (A) and a dome (B). Direct
inversion images of Giemsa-stained A6 cells disposed on a monolayer
(C) and forming a dome (D). Phase-contrast images of A6 cells disposed
on a monolayer (E) and forming a dome (F). (Scale bars = 150 μm).
(G) Experimental design for the study of PFAS-induced effects (refer
to section 2.3).
(d = day).
Figure 2. One-D
PCA-LDA score plots showing dose–response effects
of PFBS, PFOA, PFOS, and PFNA in the three experiments. *Most discriminant
PFAS-treatment compared to the control.
Figure 3. ASCA score
plots of the first component for the factors “chemical”
and “dose” of the three experiments. *Most discriminant
factor levels.
Figure 4. Effects of PFBS, PFNA, PFOS, and PFOA
on dose- and time-related
cell number increases in culture.
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