Abstract
Bisphenol S (BP-S) is one of the most important substitutes of bisphenol A (BP-A), and its environmental occurrence is predicted to intensify in the future. Both BP-A and BP-S were tested for adverse effects on early life stages of Arbacia lixula sea urchins at 0.1 up to 100 µM test concentrations, by evaluating cytogenetic and developmental toxicity endpoints. Embryonic malformations and/or mortality were scored to determine embryotoxicity (72 h post-fertilization). It has been reported in academic dataset that bisphenols concentration reached μg/L in aquatic environment of heavily polluted areas. We have chosen concentrations ranging from 0.1–100 μM in order to highlight, in particular, BP-S effects. Attention should be paid to this range of concentrations in the context of the evaluation of the toxicity and the ecological risk of BP-S as emerging pollutant. Cytogenetic toxicity was measured, using mitotic activity and chromosome aberrations score in embryos (6 h post-fertilization). Both BP-A and BP-S exposures induced embryotoxic effects from 2.5 to 100 µM test concentrations as compared to controls. Malformed embryo percentages following BP-A exposure were significantly higher than in BP-S-exposed embryos from 0.25 to 100 µM (with a ~5-fold difference). BP-A, not BP-S exhibited cytogenetic toxicity at 25 and 100 µM. Our results indicate an embryotoxic potential of bisphenols during critical periods of development with a potent rank order to BP-A vs. BP-S. Thus, we show that BP-A alternative induce similar toxic effects to BP-A with lower severity.
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Introduction
Bisphenol-A (BP-A) is an industrial chemical that has been used extensively to produce certain plastics and resins (Corrales et al. 2015). Current literature has raised concern about BP-A’s implications in several human chronic diseases (Rezg et al. 2014) and/or ecotoxicological complications (Corrales et al. 2015). These toxicologic impacts prompted different authorities to interdict this plasticizer from different industrial applications. Several countries have substituted the parental analog with bisphenol S (BP-S) under the “BP-A-free” label to indicate the safety of new products and reassure the consumer. However, the recent literature raised some doubts about the safety of “BPA-free” plastic products and has raised concern about their possible physiological disruptor properties and/or ecotoxicological effects (Mornagui et al. 2019; 2022; Qiu et al. 2019; Rezg et al. 2018; 2019; Wu et al. 2018; Wan et al. 2018; Zhou et al. 2019). BP-S is used in consumer products present in daily life such as food containers, canned foods, personal care products, paper products, manufactured plastics, and in many other industrial applications (Liao et al. 2012; Liao and Kannan 2014). Although the impact of microplastics and BP-A on marine wildlife is reported (Shahul Hamid et al. 2018; Xu et al. 2020), the adverse effects of BP-A alternatives as emergent pollutants are less well understood.
Bisphenols pass in aquatic environments through effluents discharged from wastewater treatment (when they are not completely removed before discharge), as well as directly from manufacturing industries, leachate discharges, and degradation of plastic litter (Corrales et al. 2015; Ying et al. 2009). Recently, BP-A and BP-S were detected as the predominant molecules in effluents of wastewater treatment plants in the US (Xue and Kannan 2019). Furthermore, BP-S has been detected in aquatic organisms and surface water samples from major rivers in many countries reaching, e.g., 7.2 μg/L in Adar, India (Yamazaki et al. 2015). As the usage of BP-A is predicted to decline further, environmental emissions of BP-S are likely to intensify in the future (Liu et al. 2021; Yu et al. 2015).
Sea urchins are an ecologically relevant animal group, and a valuable model frequently used for toxicity bioassays (Goldstone et al. 2006; Oral et al. 2017; Pagano et al. 2017). To the best of our knowledge, no data in the literature describes the toxicity of BP-S on sea urchins embryos. Thus, the aim of this study was to evaluate embryotoxicity and cytogenetic toxicity for both BP-A and BP-S in sea urchin embryos.
Materials and methods
Chemicals
Bisphenol A (BP-A; 4,4′-Isopropylidenediphenol; CAS 80-05-7, Purity 99%) and Bisphenol S (BP-S; 4,4′-Sulfonyldiphenol; CAS 80-09-1, Purity 98%) were obtained from Sigma-Aldrich Co.
Sea urchins
A. lixula, which is distributed in shallow rocky reefs all along the Mediterranean coasts and are important grazers in sublittoral benthic communities, was used as test organism (Guidetti and Mori 2005). Specimens were collected by hand from the coastal side in Seferihisar, Izmir, Turkey (38.152331, 26.823245). Twenty liters of seawater were bottled from the sea urchin habitat. Specimens and water samples were transferred to the laboratory in icebox, then water samples were filtered with a 0.45 µm filter. Cytogenetic and developmental toxicity assays were carried out as described previously (Oral et al. 2017; Pagano et al. 2017). Cytogenetic toxicity tests were completed in polystyrene test beakers and contained 3 replicates whereas embryotoxicity tests were carried out in 6 replicates.
The choice of test concentrations was made according to Bošnjak et al. (2014) and based on the prediction that environmental emissions of BP-S are likely to intensify in the future (Liu et al. 2021; Yu et al. 2015). For this purpose, we selected concentrations ranging from 0.1 to 100 μM. Thus, the test concentrations of both chemicals were 0.1, 0.25, 1, 2.5, 10, 25, and 100 µM for both developmental and cytogenetic toxicity experiments.
Developmental and cytogenetic toxicity control groups consisted of untreated and healthy embryos (30 embryos/ml) in 10 ml of filtered seawater. Test chemicals were dissolved in dimethyl sulfoxide (DMSO), therefore a DMSO (0.1% v:v) control group for each test was applied as well.
Embryological analysis
For embryotoxicity tests, BP-A or BP-S were placed at the bottom of each culture plate well [Falcon™ Tissue Culture Plates (6 wells, 10 ml/well)], and then suspended in 9 ml FSW. Thereafter, 1 ml of zygotes (10 min post-fertilization, p-f) was added to BP-A or BP-S and incubated at 18 °C in the dark for 72 h. After a 72-h incubation, 10−4 M chromium sulfate was added to the culture wells and the larvae were scored on an inverted microscope (100×) (Pagano et al. 2017). Embryonic/larval developmental defects were scored blind by trained readers in 100 random embryos of each test group to determine the embryotoxic effects of the test chemicals, as classified in Fig. 1: N: Normally developed plutei; P1: Malformed pluteus (skeletal and/or gastrointestinal malformations); P2: Developmental arrest at abnormal blastula/gastrula stage (pre-pluteus stage blockage). Developmental defects were calculated (%DD) = (P1 + P2). Another scored endpoint consists of the observation of dead plutei and dead pre-larval (or pre- hatching) embryos (D: early embryonic death). Thus, developmental defects and mortality were determined referring to the sum P1 + P2 + D.
Cytogenetic analysis
Cytogenetic tests were carried out 6 h p-f and the embryos were fixed in Carnoy’s solution (ethanol, chloroform, acetic acid; 6:3:1 V:V:V). Fixative was replaced with absolute ethanol right after fixation. 24 h after fixation, absolute ethanol was renewed and the samples were ready to be observed under a light microscope (1000×) with oil immersion. Mitotic activity (numbers of metaphase and anaphase) and chromosome aberrations (chromosome bridges, lagging chromosomes, multipolar spindles, free chromosome sets, fragmented chromosomes) as shown in Fig. 2, were scored in each embryo, thus allowing to assess both quantitative endpoints and mitotic anomalies.
Statistical analysis
All datasets gathered from the bioassays were statistically analyzed in IBM SPSS v20. Results of bioassays are given as mean ± standard error in the charts. Homogeneity of variances was checked by Levene’s test. Differences between each concentration group and the controls were determined by two-tailed Independent Samples t-test. A normality test was performed and the significance of the difference among the groups was evaluated by One-way Analysis of Variance (ANOVA) with Tukey’s HSD and Tamhane’s T2 post-hoc tests. Kruskal-Wallis and Mann-Whitney U Tests were applied where ANOVA assumptions were not fulfilled. Differences were considered significant when p < 0.05.
Results
Embryotoxicity
BP-A started to induce embryotoxic effects with 29% of malformed embryos at 1 µM concentration, as shown in Fig. 3. Compared to the control groups, malformed embryo percentages significantly differed at 2.5 µM (p < 0.01, Tamhane’s). 10, 25, and 100 µM concentrations of BP-A affected all embryos in the test groups (p < 0.001, Tamhane’s). Malformed embryo rates in embryos exposed to BP-S showed significant differences at 2.5 µM compared to the control groups (p < 0.05, Tukey’s). 10 and 25 µM concentrations were at a close embryotoxic level (20.5 to 21%) and differed from the controls (p < 0.01, Tukey’s). Malformed embryo rates raised to 23% at 100 µM concentration (p < 0001, Tukey’s). Malformed embryo percentages in BP-A vs. BP-S significantly differed at 0.25 µM (p < 0.01), 1 µM (p < 0.05), 2.5 µM (p < 0.01), 10 µM (p < 0.001), 25 µM (p < 0.001) and 100 µM (p < 0.001) (Student’s t tests). EC50 was calculated based on the nominal concentrations and it was found as 3.48 µM (95% Confidence Interval: 1.84 to 6.53 µM) for BP-A and not calculated for BP-S (because with tested concentrations, data do not reach a maximal effect). Altogether, developmental toxicity of BP-S was significantly lower than BP-A-induced developmental toxicity.
Cytogenetic toxicity
The cytogenetic results for BP-A plasticizer and its substitute BP-S are shown in Fig. 4. Mitotic activity in the embryos exposed to BP-A was inhibited at 25 (p < 0.05, Student’s t) and 50 µM (p < 0.01, Student’s t) concentrations. At the concentrations of 25 and 50 µM, mitotic activity significantly differed for BP-A and BP-S (p < 0.05, Student’s t) (Fig. 4a). Also the data in Fig. 4b showed that the number of embryos lacking mitotic figures (% Interphase Embryos, IE) differed at 25 to 50 µM BP-A vs. Control, and significantly above the corresponding IE values induced by BP-S (p < 0.05, Student’s t). As shown in Fig. 4d, a significant difference was observed in average total mitotic aberrations in embryos exposed to 25 to 50 µM BP-A compared to controls (p < 0.05, Mann-Whitney U test), and compared to embryos exposed to BP-S (p < 0.05, Mann-Whitney U test).
Discussion
Several studies have reported on pleiotropic toxic effects of BP-A in aquatic vertebrates and invertebrates at environmental doses (Canesi and Fabbri 2015; Crain et al. 2007; Kang et al. 2007). BP-A-induced embryotoxicity was noted previously, in sea urchins (Cakal Arslan and Parlak 2008), in zebrafish (Tse et al. 2013), in Xenopus (Gibert et al. 2011), and rodents (Chen et al. 2013).
It has been reported that BP-A can alter echinoderm physiology, reproduction, and development at environmental concentrations (Bošnjak et al. 2014; Roepke et al. 2005), which can reach 17.2 μg/L (Crain et al. 2007). BP-A can induce aberrant karyokinesis (division of the cell nucleus), leading to defective embryo development through the first cell division and retardation, along with general errors in cytoskeletal functioning in mitosis (Bošnjak et al. 2014).
The present report confirms BP-A-induced developmental and cytogenetic toxicity, while the replacement chemical (BP-S) failed to alter A. lixula early life stages. BP-A is more potent than BP-S in particular, at 10, 25, and 100 μM (~5 fold), indicating the sensitivity of A. lixula embryos to these specific bisphenols during a critical developmental period. Analogous effects were also noted within Daphnia magna and in Zebrafish embryos and larvae (Liu et al. 2021). Thus, we suggest that BP-S raises fewer, if any, environmental problems with its growing use in replacing BP-A.
The toxicity order for different bisphenols reflects that they may operate via distinct mechanisms.
It has been reported in academic dataset that bisphenols concentration reached μg/L in aquatic environment of heavily polluted areas (Liu et al. 2021). For example, levels of BP-S detected in surface waters of the Adyar River and Buckingham Canal in India have been found to reach to range from non-detectable to 7.20 μg/L and 0.058 to 2.1 μg/L respectively. For BP-A it can reach 17.2 μg/L (Crain et al. 2007). It has been also cited that bisphenol environmentally relevant concentrations are from 0.1 to 1000 μg/L (Qiu et al. 2018). Before 2013, BP-S had been detected in freshwater and sewage sludge, but rarely found in marine surface sediment. However, recent literature showed that BP-S concentration in aquatic environments started to increase progressively (Wu et al. 2018). This observation may indicate that BP-S compounds begin to be extensively used all over the world at different degrees with countries (Liu et al. 2021).
In addition, attention should be paid to the range of concentrations from 0.1–100 µM to develop environmental predictions and risk management because it has been reported that the usage of BP-A is predicted to decline further, and environmental emissions of BP-S are likely to increase in the future (Liu et al. 2021; Yu et al. 2015). Besides, BP-S is less biodegradable than BP-A in aquatic environments, which may lead to its accumulation in the biota (Danzl et al. 2009; Herrero et al. 2018). Thus, in this experimental protocol, we have chosen concentrations ranging from 0.1–100 μM in order to highlight, in particular, BP-S effects. It could be important in the context of evaluation of toxicity and ecological risk of BP-S as emerging pollutant.
Data indicate that BP-S did not exert cytogenetic toxicity at all test concentrations as compared to controls, whereas BP-A can induce cytogenetic anomalies in particular at high concentrations, 25 and 50 μM. In accordance with our data, several studies have reported that BP-A can induce DNA damage as well as structural and numerical chromosomal aberrations in vitro (Santovito et al. 2018; Xin et al. 2015) and in vivo (Izzotti et al. 2009). A recent study describes no cytogenetic effects for both BP-A and BP-S in human HepG2 cells (Hercog et al. 2020). Also, it has been reported that BP-S, compared to BPA, has a lower acute toxicity, similar or less endocrine disruption, similar neurotoxicity, and immunotoxicity, and lower reproductive and developmental toxicity (Qiu et al. 2018). On the other hand, to date there is a lack of information on the effects of BP-S on invertebrates cytogenetic, just Herrero et al. (2018) reported negative effects of BP-S on the transcriptional rate of genes in the model species Chironomus riparius on the whole.
Potential mechanisms for toxicity during larval development
It has been found a relationship between species relatedness and the estrogen agonist mode of action in BP-A-induced developmental alterations. Thus, a cross-species mode of a action via estrogen signaling have been shown leading to physiological changes in vertebrates (fish and mammals) and invertebrates (U.S. EPA 2005). Although research on endocrine disruptors and echinoderm has not been abundant, the existence of species-specific sensitivity in urchin species against BP-A and several other endocrine-disrupting compounds, on larval stage development was reported (Roepke et al. 2005). The authors concluded that EDCs could act with different mode of action (other than estrogen signaling), leading to differential response and sensitivity in embryos of each species of sea urchin. Thus, yet the molecular mechanisms or modes of action underlying bisphenols-induced developmental and cytogenetic toxicity is poorly understood in invertebrates due to the pleiotropic effects. It is instructive to offer some plausible mechanistic hypotheses:
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Endocrine disruption: While current knowledge of echinoderm endocrinology is still limited and not well understood, early evidence has reported that echinoderms physiology acts via vertebrate-like hormones (such as steroids) (Sugni et al. 2007) and it has been reported that thyroid hormones are implicated in Echinoderm metamorphosis process (Heyland et al. 2005). Also, a genomic analysis of sea urchin nervous system has been elucidated at least 37 putative G-protein-coupled peptide receptors and peptide hormones (Burke et al. 2006). Thus, in sea urchin embryos, hormones may be acts on specific targets larval development and any disruption could induce negative impact.
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Changes in the expression of a whole host of genes/gene networks, which may impact successful early developmental organisation and growth of larvae (Bošnjak et al. 2014).
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Lipid peroxidation and oxidative stress to DNA resulting in developmental impacts and toxic effects of both BP-A and BP-S as proved with transcriptome approach in zebrafish model (Yang et al. 2021).
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Epigenetic changes such as alterations in DNA methylation (Qin et al. 2021).
Conclusions
This study evaluated the effects of BPA and BPS on sea urchin embryos providing some data support for their potential ecological risks. Taken together, our results indicate an embryotoxic potential of both BP-A and its substitute BP-S during critical periods of sea urchin development with a potent rank order to BP-A vs. BP-S. We thus show that BP-A alternative, BP-S induces lower toxic effects than BP-A with significantly lower severity, though suggesting possibly concerns regarding the use of this BP-A alternative. Ultimately, several studies have shed light on embryotoxic potential of BP-A in humans, vertebrates, and invertebrates and reveal concern about the Safety of BP-A substitutes. Since the use of BPA alternative compounds is increasing, further monitoring data of the water environment and chronic toxicity in various aquatic organisms appears to be necessary.
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Funding
This work was supported by Faculty of Fisheries, Ege University and The Tunisian Ministry of Higher Education and Scientific Research. Open access funding provided by Università degli Studi di Napoli Federico II within the CRUI-CARE Agreement.
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Rezg, R., Oral, R., Tez, S. et al. Cytogenetic and developmental toxicity of bisphenol A and bisphenol S in Arbacia lixula sea urchin embryos. Ecotoxicology 31, 1087–1095 (2022). https://doi.org/10.1007/s10646-022-02568-w
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DOI: https://doi.org/10.1007/s10646-022-02568-w