Abstract
Many contaminants which are toxic and adversely affect living organisms enter surface waters. Among them, there are endocrine compounds such as steroid hormones, which can disrupt the endocrine system causing an adverse effect on the physiology of aquatic organisms. In the literature, there is not enough information about the influence of steroid hormones on phytoplankton growth. Therefore, the aim of this research was to study the effect of estrogens (estrone, 17ß-estadiol, 17-α-ethinylestradiol, and estriol), progestagens (progesterone, 5-pregnen-3b-ol-20-one, and levonorgestrel), and androgens (testosterone) on the growth of the cyanobacterium Anabaena variabilis. To our best knowledge, the chronic toxicological effects of hormones on cyanobacteria are explored for the first time. From among single steroid hormones, progesterone and 17-α-ethinylestradiol are the most toxic (EC50 48.59 and 82.95 mg L−1). On the other hand, incubation in the presence of 5-pregnen-3b-ol-20-one, testosterone, and 17ß-estadiol caused slight inhibition of growth (EC50 283.50, 336.68, and 437.82 mg L−1), while estrone, estriol, and levonorgestrel showed no significant effect on the growth of this cyanobacterium. Hormone mixtures have been found to be more toxic than single substances and exposure to them leads to the potentiation of toxicity. The EC50 after 14 days of the test duration for the mixed steroid hormones were 45.14, 37.00, and 89.46 mg L−1. This research provides a basic understanding of hormone toxicity to aquatic organism, such as cyanobacteria, and asserts a more comprehensive view on ecological risk evaluation.
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Introduction
One of the most important ecological problems faced by humanity is the deepening pollution of the aquatic environment with both natural and industrial chemical compounds (Martinez-Alcala et al. 2018). Thousands of substances are widely used by humans, but only some of them have gone through toxicological evaluation (Dionisio et al. 2015). The Toxic Substances Control Act (TSCA) specifies over 85,000 chemical substances, of which about 1% are endocrine disruptor chemicals (EDCs) that interfere with the hormonal balance of organisms and cause harmful changes in the reproductive, nervous, and immune systems (Erickson 2017; DeWitt and Patisaul 2018). According to the American Environmental Protection Agency (EPA), EDCs are defined as exogenous substances that disrupt the metabolism of living organisms as well as the synthesis, secretion, metabolism, and transport of natural hormones and are responsible for disrupting homeostasis, reproduction, and changes in behavior (Diamanti-Kandarakis et al. 2009). Studies performed over the past two decades have shown that permanent exposure to low concentrations of EDCs leads to serious disturbances in the functioning of the endocrine system and their presence in surface waters can adversely affect the health of both humans and animals living in aquatic ecosystems (He et al. 2018; Nadal et al. 2018). The main groups of compounds include endocrine-disrupting compounds such as phytoestrogens (Patisaul and Jefferson 2010), polychlorinated biphenyls (Li et al. 2016), polycyclic aromatic hydrocarbons (PAH) (Zhang et al. 2016), pesticides (Kida et al. 2018), dioxins (Brulport et al. 2017), phthalates and plastic ingredients (Dong et al. 2018), and natural and synthetic hormones (Ben Fredj et al. 2017). These substances are found in wastewater treatment plants and in the natural environment in rivers, lakes, and even oceans (do Nascimento et al. 2018). The ubiquitous occurrence of these chemical compounds in the aquatic environment is related to their persistence, ability to accumulate in organisms and sediments, low efficiency of wastewater treatment, and increased production (Daughton and Ternes 1999; Kabzinski et al. 2007; Macioszek et al. 2010; Aris et al. 2014; Zhang et al. 2017).
Recently, the number of reports on negative effects of hormones in the aquatic environment, as well as their negative impact on human and animal health, has increased (Ying et al. 2002; Czarny et al. 2017). For this reason, it is necessary to study the impact of these compounds on organisms living in aquatic ecosystems. Natural hormones excreted by humans and animals in the urine and their amounts are determined by gender, stage of growth, phase of the menstrual cycle and pregnancy (Wang and Zhu 2017). Synthetic hormones are used in hormonal and contraceptive drugs. These compounds get into surface waters with surface runoff from fields where natural fertilizers were used, and municipal wastewater and sewage from pharmaceutical plants where hormone-based drugs are produced (Hanselman et al. 2003; Leet et al. 2011). The growing concentration of synthetic hormones in the environment is associated not only with the increasingly popular contraception and hormonal drugs used by people, but also substances used to improve breeding performance and treatment of animals. Many publications have shown that hormones are toxic to aquatic organisms. Lei et al. (2013) demonstrated that exposure to 5 ng L−1 concentrations of estrone may cause irreversible gonadal damage to Japanese Medaka (Oryzias latipes) males and also lead to the complete feminization of their population. Phuge and Gramapurohit (2015) showed that exposure of frog, Xenopus tropicalis, larvae to 10 μg L−1 of 17β-estradiol leads to the complete feminization of males. Volkova and Goltsev (2015) showed that 17-α-ethinylestradiol induced behavioral changes of the guppy Poecilia reticulata at concentration 20 ng L−1. During exposure to 10 ng L−1 progesterone, an inhibition of reproductive processes and decrease in the amount of sperm in Pimephales promelas males were observed (DeQuattro et al. 2012). In contrast, the exposure of Danio rerio fish to this progestagen causes irreversible endocrine changes and leads to a change in gene expression (Liang et al. 2015; Sangster et al. 2016). The presence of testosterone in the aqueous environment reduces the concentration of vitellogenin in Gobiocypris rarus females, while in males of the same species, a significant decrease in sperm count compared to the control group was observed (Gao et al. 2015). Not only fish but also amphibians and reptiles are sensitive to testosterone in the aquatic environment. Piprek et al. (2012) carried out research on two species of frogs Bombina bombina and Bombina variegata, during which they showed that this hormone causes differentiation of gonads and promotes the creation of intersex individuals.
The assessment of the impact of pollution on aquatic ecosystems is an extremely difficult task due to the different sensitivity of aquatic organisms to chemical compounds present in the environment, and due to bioaccumulation in the upper links of the trophic chain, it is difficult to determine the long-term effects of their presence in water (Torres et al. 2008; Ahmed et al. 2018). In addition, in the natural environment organisms are often exposed to a complex mixture of pollutants and sometimes exposure to many compounds can cause interactions leading to a significant increase or decrease in the overall toxicity of the mixture compared to the sum of toxicities of individual components (Krishnan and Brodeur 1994). Therefore, it is useful to extend the research to include other compounds and other species of organisms.
The aim of this study was to investigate the influence of both natural and synthetic steroid hormones, such as estrogens (estrone, ß-estadiol, 17-α-ethinylestradiol, and estriol), progestogens (progesterone, 5-pregnen-3β-ol-20-one, and levonorgestrel), and androgens (testosterone) on the growth of cyanobacteria. There is not enough information about the effect of steroid hormones on the growth of phytoplankton and the described results are the only reports showing the toxic effect of androgens and progestagens, and their common interaction of mixture on their cells. A number of physiological parameters, such as biomass and chlorophyll a content, were assessed to define the chronic toxicity which would facilitate to understand how hormones affected cyanobacteria.
Materials and methods
Culture conditions of Anabaena variabilis
Anabaena variabilis ATCC-29413 was obtained from the Faculty of Biology, University of Lodz, Poland. Cyanobacteria were grown in sterilized glass Erlenmeyer flasks with vented closures to enhance gas exchange during incubation and shaking. The cultivation and experiments were performed in the mineral medium BG-11 (Rippka et al. 1979). The pH of the medium was adjusted to 7.64 ± 0.02 with 1 M HCl and/or NaOH. In order to provide optimal growth conditions, the cultures were carried out in a phytotron chamber in the photoperiod in the light/dark cycle 12/12 h, at temperature 23/20 °C (day/night) with constant humidity of 30%, and kept on rotator shaker (100 rpm). Cultures were grown under continuous illumination of 60 μmol photons m−2 s−1. The cyanobacteria were grown in these conditions for several months before exposure. For the experiments, 100 mL of the liquid BG-11 medium containing A. variabilis cells was distributed to several 250-mL Erlenmeyer flasks. The density of the culture before starting the experiment was 4 × 105 cells mL−1.
Exposure of Anabaena variabilis to steroid hormones
The A. variabilis colonies were cultured in the presence of the following single steroid hormones: estrone (E1), 17ß-estadiol (E2), 17-α-ethinylestradiol (EE2), estriol (E3), progesterone (PRO), 5-pregnen-3β-ol-20-one (PRE), levonorgestrel (LG), testosterone (TST). The cyanobacterium cultures also were exposed to mixed at equal proportion hormones, such as all of the examined hormones E1:E2:E3:EE2:PRO:PRE:TST:LG (1:1:1:1:1:1:1:1) (MIX1); the most toxic estrogens, progestogens, and androgens EE2:PRO:TST (1:1:1) (MIX2); and also the most toxic and showing no significant effects hormones PRO:E1:E3:LG (1:1:1:1) (MIX3) (Sigma, USA). The MIX1, MIX2, and MIX3 were prepared with 1/8, 1/3, and 1/4 of each hormone (mg mL−1), respectively, to obtain the same final concentration tested for individual steroid hormones. The control samples were cultured in the same medium and in the same conditions, but without the presence of steroid hormones. Range finding assays were performed prior to final definitive tests in order to determine the concentrations in which effects are likely to occur. Each tested compound was first dissolved in methanol and then the dissolved form was added to 100 mL of cyanobacterium culture at the nominal concentrations 0.1, 1, 10, 25, 50, 75, and 100 mg L−1. The same amount of methanol was added to the control sample. The number of cells, biomass, and chlorophyll a content were monitored in the cells of A. variabilis after 1, 2, 3, 7, 8, 10, 13, and 14 days of exposure to the analyzed chemical compounds and in control samples cultured in the same conditions.
Measuring the growth of Anabaena variabilis
The growth of the A. variabilis was assessed by counting the number of cells and determining biomass and chlorophyll a. The cyanobacterium cells were determined using a Fuchs-Rosenthal hemocytometer, with an Olympus CX-41 (× 600) microscope equipped with an Olympus UC30 camera. In order to determine the biomass, 10 mL of the culture was filtered on the previously dried and weighed 47 mm diameter 3 μm pore size nylon membrane filters (Yeti), and then dried for 1 h at 105 °C and weighed again. The concentration of chlorophyll a was determined using an AlgaChek Ultra fluorometer (Modern Water, UK).
Statistics
The EC50 values (concentrations that cause a 50% growth inhibition) and the dose-response equation for A. variabilis were determined via dose-response curves prepared using Microsoft Excel (Microsoft Corporation, USA). EC50 values were calculated using linear regression analysis of transformed hormones concentration as natural logarithm data versus percent of inhibition.
The obtained results were statistically evaluated. Each treatment was repeated at least three times. The results are reported as the average of three parallel determinations of the mixture of three replicated samples. The Q-Dixon test was carried out and then the obtained values were averaged. The Q-Dixon test can be used for identification and rejection of outliers (Dixon 1953). Standard deviations (SD) were calculated in order to determine the accuracy and precision of the methods used. Regressions and confidence limit calculations were made using Statistica (StatSoft) software. Differences were considered significant for P < 0.05.
Results
The influence of single steroid hormones on the growth of Anabaena variabilis
The chronic toxic effect of the eight single steroid hormones on A. variabilis was determined (Table 1). Figures 1 and 2 show changes in the algal biomass in the form of dry weight and chlorophyll a content after exposure to the tested chemicals. Based on the obtained results, it can be observed that some of the hormones have a strongly inhibitory effect on the A. variabilis (Supplementary Table S1).
From among hormones tested individually, the strongest toxic effect was observed under the influence of progesterone, which produced a significant reduction in the number of cells, biomass, chlorophyll a, and EC50 values. This progestogen led to cyanobacterial cell death at 75 and 100 mg L−1 on the 13th day of incubation. The remaining concentrations of progesterone inhibit the growth of A. variabilis from day 2 of the test. 17-α-Ethinylestradiol also has a strong toxic effect and inhibits the growth of the cyanobacteria from day 2 of exposure, except for the lowest concentrations (0.1 and 1 mg L−1) which do not significantly affect the growth of A. variabilis. Testosterone and 5-pregnen-3β-ol-20-one significantly inhibited the growth of cyanobacteria from the 7th day of exposure to these compounds. During the first 3 days, no significant differences were observed in the presence of these hormones compared to the control sample. However, after day 7, a significant inhibition of cyanobacterial growth at higher concentrations (50–100 mg L−1) was observed. Meanwhile, in the case of ß-estadiol, during the first 3 days of exposure, the growth of A. variabilis was stimulated and during the next days, the growth was inhibited by 10–100 mg L−1 of this estrogen. The weakest effects on the A. variabilis were shown by estrone, estriol, and levonorgestrel which, in the studied range of concentrations, do not significantly affect the growth. Table 1 shows the EC50 values for the steroid hormones tested with a 95% confidence interval. Based on the determined EC50 values, among all of the tested endocrine compounds, the strongest toxic effects on A. variabilis cells were exerted by progesterone and 17-α-ethinylestradiol (14 days EC50, 48.59 and 82.95 mg L−1). A moderately toxic effect was observed for 5-pregnen-3β-ol-20-one, testosterone and ß-estadiol, for which the EC50 after 14 days of exposure were 283.50, 336.68, and 437.82 mg L−1, respectively. In contrast, estrone, estriol, and levonorgestrel showed a slightly toxic effect on A. variabilis. Based on the number of cells, chlorophyll a and biomass determined EC50 values; the toxic effects of endocrine compounds can be ranked as follows: PRO> EE2 >> PRE > TST > E2 > E3 > LG > E1.
The influence of mixed steroid hormones on the growth of Anabaena variabilis
The number of cells, chlorophyll a, and biomass of A. variabilis exposed to mixture hormones are shown in Supplementary Table S1 and in Figs. 3 and 4. EC50 values are listed in Table 1. In the case of mixed steroid hormones MIX1, a highly toxic effect on A. variabilis was observed. The obtained results show that the hormone mixture lead to death of the cyanobacterium culture at concentrations of 75 and 100 mg L−1 already on the 7th day of exposure. Under the influence of 10 and 25 mg L−1, the growth of the cyanobacteria is inhibited, while for the remaining concentrations, no significant differences were observed compared to the control sample. MIX2 leads also to death of A. variabilis cultures. The mixed estrogen, progestin, and androgen shows the most toxic effect on A. variabilis. Total death of cells is already achieved on the 3rd day of exposure at concentrations of 75 and 100 mg L−1. The remaining concentrations significantly inhibit growth. On the other hand, MIX3 shows a significantly weaker effect on cyanobacterial cells compared to the other mixed steroid hormones. As can be seen in Table 1, the EC50 values for the tested steroid hormone mixtures were 45.16, 37.00, and 89.46 mg L−1 for MIX1, MIX2, and MIX3, respectively.
Discussion
As is well known, steroid hormones negatively affect many organisms living in aquatic ecosystems, including species of fish, amphibians, mollusks, and zooplankton (Czarny et al. 2017). Less is known about the effect of these compounds on the development of phytoplankton and the only information concerns the effect of estrogen. Salomao et al. (2014) examined the effect of natural steroid hormones such as estrone, ß-estadiol, and synthetic 17-α-ethinylestradiol in the green algae Desmodesmus subspicatus and Pseudokirchneriella subcapitata and also noted that EE2 and E2 show more toxic effects on cells than E1. The cultures of both green algal species were most sensitive to 17-α-ethinylestradiol, for which the obtained EC50 values were 0.73 and 0.80 mg L−1, respectively. They also showed that P. subcapitata was more sensitive to the tested estrogens than D. subspicatus (Salomao et al. 2014). Pocock and Falk (2014) also noted the negative effect of 17-α-ethinylestradiol on the growth and photosynthesis of the green alga Chlamydomonas reinhardtii at a concentration of 10 pM. Comparing their results, it can be concluded that these phytoplankton species are much more sensitive to the action of estrogens than the tested A. variabilis. The results obtained by Liu et al. (2010) confirm the toxic effect of estrogens on phytoplankton cells. Their toxicity tests showed that incubation in the presence of 17-α-ethinylestradiol and ß-estadiol led to growth inhibition of the diatom Navicula incerta and the determined EC50 values were 3.21 and > 10 mg L−1, respectively. This confirms that the occurrence of synthetic EE2 in the aquatic environment has a more profound effect on the growth of algae than natural estrogens. A similar tendency of hormones is observed not only for phytoplankton cells, but also for other aquatic organisms. Lange et al. (2012) studied the effect of estrogens on the feminization of wild freshwater fish, and their capability for disruption of the endocrine system increased in the order: EE2 > E2 > E3 > E1. In the literature, there are many reports on the influence of progestins and androgens on the endocrine system of fish. However, the toxicity of progestagens and androgens and their interaction in a mixture on phytoplankton growth has not been studied yet, and the presented results are the only reports on this topic. According to many authors, a large number of phytoplankton strains are able to convert pharmaceutical pollutants in surface water and wastewater into useful metabolites (Gentili and Fick 2017; Ojoghoro et al. 2017; Wang et al. 2017). Safiarian et al. (2012) studied the bioconversion efficiency of progesterone in the range of 50 to 400 mg L−1 by cyanobacterium Microchaete tenera. They show that the optimum concentration of progestagen, which gave maximum bioconversion efficiency, was 250 mg L−1 and higher concentrations (400 mg L−1) inhibited the bioconversion completely. Peng et al. (2015) observed that 1.6 μM progesterone and levonorgestrel did not significantly influence the growth of Scenedesmus obliquus and Chlorella pyrenoidosa. The results obtained by Wang et al. (2013) suggested that microalga species were tolerant to estrogens (E2, EE2), but the effects were species specific, and the way each species combats the oxidative stress posed by hormones was different. The phytoplankton transformation of hormones could have environmental implications in their fate and potential implementation in wastewater treatment (Escapa et al. 2017). All of these results highlight the importance of species selection in the application of phytoplankton for wastewater treatment. In this study, in most cases, EC50 values decrease with time, which suggested a time response attenuation effect, as previously observed for P. subcapitata and D. subspicatus exposed to E1, E2, and EE2 (Salomao et al. 2014).
In the aquatic environment, organisms such as phytoplankton are exposed to hormones, which usually do not occur alone, but in a mixture (Lei et al. 2009; Ben Sghaier et al. 2017). An additive effect of mixed compounds is often assumed, so toxicity of the mixture is similar to the sum of toxicities of individual components. However, there are cases where toxicity is significantly higher than the additive toxicity, and then potentiation of toxicity (less than additive effect) can be observed. In the present study, the EC50 values for all tested mixed steroid hormones decrease with time, suggesting that their toxicity increases. Comparing them with values for single steroid hormones, it can be seen that the sum of toxicities of individual components is much higher than the toxicity of the mixed hormones. Increased toxicity against A. variabilis due to the presence of mixed hormones suggests that their action is potentiated. This is a particularly dangerous phenomenon because in the aquatic environment, hormones were present in mixtures, so their effect on phytoplankton can lead to inhibition of their growth. As a consequence, it may lead to changes in the structure of their biocenosis, creating a serious threat to entire aquatic ecosystems. It can be noticed that the composition of hormones in their mixtures has a decisive effect on their toxicity. The smallest value of EC50 is shown by MIX2. These high toxicities result from the presence of three hormones (EE2, PRO, TST), which caused the strongest inhibitory effect on the growth of A. variabilis. A highly toxic effect, although weaker than in the case of MIX2, was shown by MIX1. It consists of all of the tested hormones and the lowest toxicity is associated with the effect of diluting the most active compounds. The weakest effect is shown after incubation of MIX3. It is caused by the presence of three steroid hormones (E1, E3, and LG), which only slightly affect the growth and only one (PRO), which has a toxic effect on A. variabilis. The only reports on the impact of mixed hormones on phytoplankton cells can be found in Salomao et al. (2014) who studied the effect of E1:E2:EE2 mixed in equal proportions (1:1:1) on the green alga D. subspicatus. After 96 h of the test, the EC50 values for single estrogens were 7.25, 1.07, and 0.73 mg L−1, respectively, while for the hormone mixture, this value was 4.94 mg L−1. The obtained toxic effect is higher than the total value of individual estrogens, which suggests that also in the case of this green algae, potentiation of toxicity by the presence of estrogens was observed (Salomao et al. 2014).
The mechanisms of action of steroid hormones on A. variabilis cells are not well understood yet. It is known that EDCs disturb the hormonal balance and negatively affect the functioning of the endocrine system of many aquatic organisms (Abdel-Moneim et al. 2015; Hu et al. 2017). However, phytoplankton cells are organisms that do not have the endocrine system, which is why their mechanism of action is different. It can be assumed that due to their lipophilic nature (Table 1), they easily penetrate the phytoplankton cell membranes and bioaccumulate (Silva et al. 2012; Blewett et al. 2014). Perron and Juneau (2011a) showed that endocrine-disrupting substances affect photosynthesis activity and have a negative effect on PSII energy fluxes. In addition, it was observed that cyanobacteria were much more sensitive to these compounds than the green algae, suggesting that the prokaryotic structure of these organisms is responsible for their particular sensitivity. Balina et al. (2015) in their studies also confirmed the effect of hormones on the alga photosystem. In addition, they showed that increased concentrations of EE2 lead to damage and inhibition of cell division of microalgae and affect the ability of phytoplankton cells to grow.
Conclusions
The presented studies show that single and mixed steroid hormones may inhibit the growth of the cyanobacterium A. variabilis. From among tested hormones, progesterone showed a highly toxic effect. Incubation in the presence of these progestogens leads to the cell death of the cultures during the 13th day of the test at concentrations of 75 and 100 mg L−1. Similar results were obtained under the incubation with 17-α-ethinylestradiol, and the growth of A. variabilis was more strongly inhibited than in the case of ß-estadiol, 5-pregnen-3β-ol-20-one, and testosterone. Estrone, estriol, and levonorgestrel have no significant effect on the growth of the cyanobacterium cultures. In summary, based on the EC50 values, single hormones toxicity increases in the order: PRO> EE2 >> PRE > TST > E2 > E3 > LG > E1. The strongest toxic effect on the studied cyanobacteria is shown by mixed steroid hormones and leads to the potentiation of the toxicity. MIX2 and MIX1 were more toxic than MIX3, and the toxic effect on A. variabilis cultures depends on the composition of the mixture. The EC50 values for all tested steroid hormones decrease with time, suggesting that their toxicity increases. An increase in the consumption of pharmaceuticals causes an inevitable increase in the contamination of the aquatic environment with compounds such as steroid hormones. In the future, the concentrations of these endocrine active compounds may increase enough to inhibit phytoplankton growth and disrupt the balance of entire aquatic ecosystems. Due to the small number of publications on the effect of steroid hormones on phytoplankton, their effects are not fully understood. In addition, studies show that the presence of a mixture of these contaminants in the aquatic environment may cause a much stronger effect on living organisms and in the case of steroid hormones there is a potentiation of toxicity. Therefore, further research on other endocrine and phytoplankton compounds is needed to fully understand how steroid hormones affect these aquatic organisms, to provide a more comprehensive view of the ecological risk assessment. Further study should be conducted on the bioaccumulation, food chain transport, and distribution of hormones in organisms of different trophic levels in the aquatic environment.
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Czarny, K., Szczukocki, D., Krawczyk, B. et al. Inhibition of growth of Anabaena variabilis population by single and mixed steroid hormones. J Appl Phycol 31, 389–398 (2019). https://doi.org/10.1007/s10811-018-1589-9
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DOI: https://doi.org/10.1007/s10811-018-1589-9