Nanoplastics and nano-ZnO facilitate Cd accumulation in zebrafish larvae <i>via</i> a distinct pathway: Revelation by LA-ICP-MS imaging

Nanoplastics and nano-ZnO facilitate Cd accumulation in zebrafish larvae via a distinct pathway: Revelation by LA-ICP-MS imaging

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Pengyu Chen^a, Beibei Chen^a, Man He^a, Yuxi Zhou^b, Lei Lei^b, Jian Han^b, Bingsheng Zhou^b, Ligang Hu^c, Bin Hu^a^,*

Chinese Chemical Letters | 2025, 36(2) : 109908

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Chinese Chemical Letters | 2025, 36(2): 109908

• Communication •

Nanoplastics and nano-ZnO facilitate Cd accumulation in zebrafish larvae via a distinct pathway: Revelation by LA-ICP-MS imaging

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Pengyu Chen^a, Beibei Chen^a, Man He^a, Yuxi Zhou^b, Lei Lei^b, Jian Han^b, Bingsheng Zhou^b, Ligang Hu^c, Bin Hu^a^,*

Affiliations

^a Department of Chemistry, Wuhan University, Wuhan 430072, China

^b State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China

^c State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China

Published: 2025-02-15 doi: 10.1016/j.cclet.2024.109908

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Abstract

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The interaction between nanoparticles (NPs) and pollutants affects their bioavailability and toxicity. However, the processes by which NPs and pollutants change in vivo have rarely been explored. Here, using laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP–MS), we found that both nanoplastics and ZnO NPs caused more Cd to accumulate in zebrafish larvae, but with distinct pathways. Nanoplastics could adsorb Cd²⁺ and transfer it into the larvae through the "Trojan horse" effect. The coexposure of nanoplastics and Cd²⁺ caused Cd to accumulate in the abdomen where the nanoplastics were located without dissociation, showing a lower toxic effect than Cd²⁺ exposure alone. ZnO NPs weakly adsorbed Cd²⁺, but they increased the Zn and Cd contents in larvae by enhancing the expression of metal transporters. The coexposure of ZnO and Cd²⁺ evenly distributed Cd in the larvae, revealing a more severe toxic effect than Cd²⁺ exposure alone. Our results demonstrated the changing bioavailability and toxicity of Cd induced by different NPs. This also shows the vital role LA-ICP-MS plays in revealing the relationship between toxicity and bioavailability. In addition, the long-term effect of bioavailability on heavy metal toxicity and nanosafety deserves further investigation.

Key words

LA-ICP-MS / Nanoplastics / ZnO nanoparticles / Cadmium / Combined effect / Zebrafish larvae

Cite this Article

Pengyu Chen, Beibei Chen, Man He, Yuxi Zhou, Lei Lei, Jian Han, Bingsheng Zhou, Ligang Hu, Bin Hu. Nanoplastics and nano-ZnO facilitate Cd accumulation in zebrafish larvae via a distinct pathway: Revelation by LA-ICP-MS imaging[J]. Chinese Chemical Letters, 2025 , 36 (2) : 109908 - . DOI: 10.1016/j.cclet.2024.109908

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Nanoparticles (NPs) in the environment inevitably interact with coexisting pollutants, which leads to changes in their bioavailability and subsequent toxic effects [1]. However, the "fate" of these pollutants once they enter the organism, which has a noticeable effect on toxicity, is unknown. For example, Park et al. suggested that zebrafish might not be able to utilize 17α-ethinylestradiol (EE2) bound to nC60 because they could not be released, resulting in a diminished toxic effect [2]. Tian et al. reported that phenanthrene (Phe) bound by TiO₂ NPs was released due to changes in pH in the mussel gut, causing more severe toxicity [3]. While, these studies tend to infer the interaction of NPs and pollutants through in vitro adsorption experiments without in situ locations. Since such processes in organisms are very complex and largely unclear, exploring the interaction between NPs and pollutants in vivo is essential for linking the biological effects of chemicals to the action site of pollutants. Laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) is an effective method for obtaining in situ elemental images from biological systems [4]. Compared with X-ray fluorescence analysis (XRF) and transmission electron microscopy (TEM), LA-ICP–MS can provide isotope information and high sensitivity. The ability to detect pollutants at ambient concentrations enables LA-ICP–MS to be a promising tool in the elemental imaging of inorganic pollutants [5], NPs [6] and organic pollutants [7].

In the past few decades, white pollution has been caused by the massive use of plastic products. Different types and sizes of plastics can be detected in various types of environments [8,9]. Due to their small size, nanoplastics can be easily absorbed by aquatic organisms and have the ability to adsorb other pollutants [10,11], causing health defects [12]. However, as an emerging environmental pollutant, our understanding of nanoplastics is not as deep as that of other engineered NPs. Zinc oxide NPs (ZnO NPs) as a commonly used engineering NPs has been well studied. Oxidative stress induction, neurotoxicity and genotoxic damages have been found in ZnO NPs exposure fishes [13]. Therefore, ZnO NPs has been used to compare with the toxicity of nanoplastics [14-16]. Their toxicity may be the same or different in different biological models. Exploring the different effects of engineered NPs and nanoplastics is of great significance to help us understanding the toxicity mechanism of nanoplastics.

Cadmium (Cd), a heavy metal, is widely used in plastic additives and is often detected in plastic products [17]. Holmes et al. observed the adsorption of Cd by microplastics in an aqueous environment [18,19]. Thus, high concentrations of essential elements and trace elements would be adsorbed on microplastics or nanoplastics, making them carriers of metal transportation in ecosystems [20] and affecting their subsequent bioavailability. For example, Lu et al. used 5 µm polystyrene (PS) to study the combined effect of microplastics and Cd on adult zebrafish [21]. Coexposure increased the accumulation of Cd and caused oxidative damage and inflammation in tissues. Zhang et al. also used 10 µm PS NPs to evaluate the combined effects of microplastics and Cd on zebrafish embryos [22]. The results showed that coexposure had a negative impact on survival and heart rate. However, nanosized microplastics have rarely been investigated. The interaction of nanoplastics with Cd²⁺ in vivo has not been studied either.

The interaction between NPs and Cd²⁺ after entering the aquatic organisms should be carefully considered for it would affect the bioavailability and the subsequent toxic effects of the two pollutants. Nowadays, the total internal concentration of chemicals in zebrafish embryos is usually determined using their homogenate. In this way, the information on distribution of the pollutants in the different organs of zebrafish embryos was lost. While chemical imaging could provide us with a better understanding of the toxicokinetics because it would show how chemicals are distributed in zebrafish embryos and whether they are enriched in specific areas/organs. Thus, in our work, using LA-ICP–MS, the bioavailability of Cd²⁺ induced by coexposure to PS NPs was investigated and compared with that of ZnO NPs. By linking the elemental images with the biochemical assessment, the effects of PS NPs combined with Cd²⁺ at ambient concentrations on zebrafish larvae were comprehensively explored. For comparative study, both the particle size of ZnO NPs and Eu-PS NPs used were 100 nm (Fig. S1 in Supporting information).

When NPs interact with coexisting pollutants, their bioavailability could be changed, which will lead to a change in toxic effects, such as increased accumulation and toxicity, increased accumulation but no change in toxicity, or even increased accumulation but decreased toxicity. This often has to do with the change and distribution of NPs or coexisting pollutants after they enter the organism. As a powerful elemental imaging method, LA-ICP-MS can help to locate metal contaminants and NPs in vivo. Through this direct imaging method, we could clearly obtain the location of pollutants and NPs to understand the interaction between them in vivo. The results are shown in Fig. 1. As seen, with the exposure of Cd²⁺, Cd was uniformly distributed in the larvae except for high fisheye intensity. A higher concentration of Cd²⁺ exposure resulted in a higher Cd signal intensity. When ZnO NPs were coexposed with Cd²⁺, the distribution of Cd was similar to that obtained under Cd²⁺ exposure alone, and the distribution of Cd in the fish body was relatively uniform. However, with the exposure of Eu-PS NPs, the accumulation of Eu-PS NPs in the heart, head, liver and pancreas of larvae was obvious, which was consistent with a previous report [23]. When Eu-PS NPs and Cd²⁺ were coexposed, the accumulation site of Eu-Ps NPs also showed corresponding accumulation of Cd. Some NPs strongly adsorb pollutants, which makes them carriers for the transmission of pollutants and affects the subsequent bioavailability. This is the so-called "Trojan-horse" effect [24]. It represents the potential carrier function of NPs for chemicals leading to a facilitated uptake of chemicals into organisms and resulting in an increased toxicity [24]. In the in vitro interaction study of NPs and Cd, we found that PS NPs could absorb Cd²⁺, while the adsorption of Cd²⁺ by ZnO NPs was weak (Fig. S1C). It has been reported that PS has a high adsorption capacity for Cd²⁺, and as time passes, Cd²⁺ will first be rapidly adsorbed on the surface of PS and then diffuse in the pores [25]. Therefore, in the coexposure to PS NPs and Cd²⁺, Cd entered the larvae through the "Trojan horse" effect. This would also make the distribution of Cd organ specific. Moreover, the Cd²⁺ adsorbed by Eu-PS NPs did not dissociate from Eu-PS NPs during the time span of exposure. Cd remained in the abdomen (including heart, liver and pancreas) where Eu-PS NPs were located but failed to distribute in other organs.

To further investigate the changes in NPs and Cd²⁺ bioavailability caused by coexposure, the Zn, Cd and Eu contents in zebrafish larvae were measured, and the results are shown in Fig. 2. Cd²⁺ exposure significantly increased the Cd and Zn contents in larvae. The increasing Zn content might be related to resistance to the adverse effects of Cd [26,27]. When ZnO NPs were coexposed with Cd²⁺, the Cd content was significantly increased compared with that obtained by only exposure to Cd²⁺ (1.06 µg/g for ZnO + 10 Cd²⁺ vs. 0.67 µg/g for 10 Cd²⁺, and 5.33 µg/g for ZnO + 100 Cd²⁺ vs. 3.43 µg/g for 100 Cd²⁺). The Zn content also increased compared with ZnO NPs exposure alone (130.1, 144.5 and 163.2 µg/g for ZnO, ZnO + 10 Cd²⁺, and ZnO + 10 Cd²⁺, respectively). Eu-PS NPs exposure did not change the Zn content in larvae, and after coexposure to Cd²⁺, there was still no significant change in Zn content compared with the control group. However, the Cd content was significantly increased after Eu-PS NPs and Cd²⁺ coexposure compared with Cd²⁺ exposure alone. Obviously, the adsorption of Cd²⁺ by Eu-PS NPs would cause more Cd to enter the larvae through the "Trojan horse" effect and accumulate in the abdomen of larvae (Fig. 1). The adsorption of Cd²⁺ by ZnO NPs was much lower than that by Eu-PS NPs; however, the coexposure of ZnO NPs and Cd²⁺ caused more Cd to accumulate in larvae than Eu-PS NPs. Therefore, the "Trojan horse" effect might not be the main reason for the change in Cd bioavailability in the ZnO NPs and Cd²⁺ coexposure groups.

It is worth noting that under exposure to Cd²⁺, the Zn content changed significantly (Fig. 2). After adding ZnO NPs or Eu-PS NPs for coexposure, the changes in Zn were also different. In mammals, cellular Zn homeostasis is mainly maintained by Zn transporters, in which Zrt-Irt-like protein (ZIP) increases intracellular Zn levels by transporting Zn from the extracellular space to the cytoplasm. The ZIP family has also been found in zebrafish [28,29]. Besides the transportation of Zn, the ZIP family could also transport Cd and other heavy metals [30]. Therefore, the gene expression of the transport protein under different exposure conditions was investigated (Fig. 3).

Cd²⁺ exposure significantly increased the gene expression of ZIP1 and ZIP8. Through the increase in transporters, the Cd and Zn contents increased, which resulted in the uniform distribution of Cd and Zn in larvae. In the ZnO NP and Cd²⁺ coexposure group, the expression levels of ZIP1 and ZIP8 also increased, and they were significantly higher than those of ZnO NPs exposed alone. The high ZIP1 and ZIP8 gene expression levels further explained the increase in the Cd and Zn contents in the ZnO NPs- and Cd²⁺-coexposed group compared to the individual exposures. The Zn and Cd that entered the larvae through the transporter also showed a homogeneous distribution in the larvae, as did Cd²⁺ exposure alone (Fig. 1). In the Eu-PS NP and Cd²⁺ coexposure group, the expression level of ZIP1 was comparable to that of Cd²⁺ exposure alone. When 100 µg/L Cd²⁺ was coexposed to Eu-PS NPs, the expression level of ZIP8 was even lower than that in larvae exposed to Cd²⁺ alone. This indicated that when Eu-PS NPs were coexposed with Cd²⁺, only a small amount of the Cd might enter the larvae through transporters, while most of the Cd entered the larvae by the "Trojan-horse" effect. Therefore, Cd stayed in the organs where PS NPs accumulated instead of being evenly distributed (Fig. 1).

Since Eu-PS/ZnO NP coexposure with Cd²⁺ could change the bioavailability and distribution of Cd, the adverse effects caused by the coexposure on zebrafish larvae were investigated. Cd can induce oxidative stress and cause toxicity through the production of reactive oxygen species (ROS) [31]. Excessive production of ROS can cause lipid and protein peroxidation, leading to death and pathological damage [32]. Nonetheless, fish also have a suite of defensive mechanisms to cope with increasing oxidative stress. Therefore, we investigated the levels of ROS and antioxidative stress in zebrafish larvae (Fig. 4). From Fig. 4A, the exposure of Cd²⁺ would increase the ROS level significantly. On the contrary, Eu-PS/ZnO NPs exposure would not affect the ROS level. When Eu-PS NPs co-exposed with Cd²⁺, the ROS level increased with the increase of Cd²⁺ concentration, and the degree was equivalent to that of Cd²⁺ exposed alone. Co-exposure of ZnO NPs and Cd²⁺ would cause the ROS level to rise sharply compared with the exposure of Cd²⁺. Excessive ROS lead to lipid peroxidation, which can lead to the formation of malondialdehyde (MDA) [33]. Thus, from Fig. 4B, the ZnO NPs and 100 µg/L Cd²⁺ co-exposure group caused the highest MDA content. However, the MDA content barely change for ZnO NPs exposure group, Eu-PS exposure group and the ZnO NPs/Eu-PS + Cd²⁺ co-exposure group with low concentration of Cd²⁺. Under these exposure conditions, the ROS level might not cause significant lipid peroxidation, therefore, the MDA content did not change. Cd²⁺ exposure could also affect the activity of antioxidant enzymes such as superoxide dismutase (SOD) and catalase (CAT) in zebrafish [34]. As can be seen from Figs. 4C and D, under the exposure of Cd²⁺ alone, the SOD and CAT activity increased with the increase of Cd²⁺ concentration, indicating that the zebrafish larvae produced an anti-oxidative stress response to resist the ROS. ZnO NPs exposure alone would increase SOD activity. Adult zebrafish exposed to a certain concentration of Zn²⁺ showed increased antioxidant enzyme activity to address the adverse effects of Cd²⁺ [35]. Therefore, when ZnO NPs were exposed with low concentrations of Cd²⁺, the larvae absorbed more Zn and Cd at the same time (Fig. 2), and the SOD activity was higher than that of ZnO NPs or Cd²⁺ exposure alone. More Zn can alleviate the adverse effects of Cd, which is consistent with the fact that the MDA content does not increase significantly under this exposure condition. When high concentration Cd²⁺ was exposed with ZnO NPs, the SOD and CAT activity was equivalent to that of 100 µg/L Cd²⁺ exposure. Considering that more Cd has been absorbed by larvae than 100 µg/L Cd²⁺exposure alone at this time, it may not be sufficient for the regulation of oxidative stress, resulting in an increase in ROS and a decrease in survival rate (Fig. S2 in Supporting information). However, for Eu-PS NPs, SOD and CAT activity only increased when coexposed to 100 µg/L Cd²⁺. Cd remained in the abdomen where Eu-PS NPs were located (Fig. 1), which indicated that the "fixed" Cd failed to attack other systems and did not cause an increase in ROS levels. Both Cd²⁺ and Zn²⁺ exposure could enhance the expression of SOD and CAT through the Nrf2 pathway to resist oxidative stress in fish [36]. The experimental results in Figs. 4E and F showed similar results to changes in antioxidant enzymes. Oxidative stress could also induce immunotoxicity. IL-8 and TNFα have been used as markers to activate the inflammatory response in zebrafish embryos [37]. Similar to the results of oxidative stress, coexposure to ZnO and 100 µg/L Cd²⁺ caused the highest inflammatory response (Fig. S3 in Supporting information).

Cd²⁺ can cause neurotoxicity in aquatic organisms [38]. Therefore, the AChE activity, ATP content and average speed of larvae were investigated to explain the cause of the abnormal behavior of larvae under Cd²⁺ stress (Fig. S4 in Supporting information). Cd²⁺ exposure caused a significant decrease in AchE activity, ATP content and average swimming speed of larvae. Mitochondria are the main site of ROS production and the key intracellular target of Cd stress [39,40]. Dysfunction of mitochondria, which are responsible for the production of ATP, could lead to multisystem failure in energy-demanding organs such as the central nervous system (CNS) [41]. Once the mitochondrial structure is damaged, the ATP level of nerve cells is insufficient, which eventually leads to brain damage and disordered behavior of zebrafish larvae. In the coexposure to ZnO NPs and 100 µg/L Cd²⁺, the AChE activity and ATP content as well as the average swimming speed of larvae also decreased, which was equivalent to that of Cd²⁺ exposure alone. This might be caused by the excessive Cd in the larvae. Neither Eu-PS NPs exposed alone nor exposed to different concentrations of Cd²⁺ affected the activity of AchE or behavior of fish. In other words, the neurotoxic effect of Eu-PS NP and Cd²⁺ coexposure was lower than that of ZnO NP and Cd²⁺ coexposure.

In general, ZnO NP and Cd²⁺ coexposure caused more serious toxic effects on zebrafish larvae than Eu-PS NP and Cd²⁺ coexposure in terms of oxidative stress, inflammatory response and neurotoxicity. In the ZnO NP and Cd²⁺ coexposure group, Cd was evenly distributed in the larvae through the metal transporter (Fig. 3). The evenly distributed excessive Cd could cause damage to the whole fish body, leading to more dramatic changes in the corresponding toxicity index. In the coexposure of Eu-PS NPs and Cd²⁺, Cd was absorbed by larvae through the "Trojan horse" effect and remained in the abdomen where Eu-PS NPs were located but failed to attack other systems (Fig. 1). The "fixed" Cd explained why Eu-Ps NP and Cd²⁺ coexposure could make larvae absorb more Cd but cause less toxic effects than Cd²⁺ exposure alone (Fig. 5). This fully demonstrated that the interaction between NPs and metals in vivo had a significant impact on bioavailability and subsequent toxicity. This does not mean that coexposure to Eu-Ps NPs and Cd²⁺ is safe. It is unknown whether long-term exposure would lead to more dissociation of Cd from PS NPs. Our work reveals that LA-ICP-MS biological imaging combined with toxicity detection can intuitively explain the changes caused by co-exposure, indicating that LA-ICP-MS bioimaging techniques can provide new clues to study the effect of coexposure of nanoparticles with pollutants, showing great promising applications in environmental health.

Declaration of competing interest

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The authors declare that they have no known competing finan- cial interests or personal relationships that could have appeared to influence the work reported in this paper.

CRediT authorship contribution statement

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Pengyu Chen: Investigation, Methodology, Writing – original draft, Writing – review & editing. Beibei Chen: Conceptualization, Methodology, Writing – review & editing. Man He: Methodology, Writing – review & editing. Yuxi Zhou: Validation. Lei Lei: Validation. Jian Han: Validation, Writing – review & editing. Bingsheng Zhou: Methodology, Writing – review & editing. Ligang Hu: Methodology, Writing – review & editing. Bin Hu: Conceptualization, Funding acquisition, Methodology, Supervision, Writing – review & editing.

Acknowledgments

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This work was financially supported by the National Natural Science Foundation of China (NSFC, Nos. 22174103 and 21575107).

Supplementary materials

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Supplementary material associated with this article can be found, in the online version, at doi:10.1016/j.cclet.2024.109908.

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Year 2025 volume 36 Issue 2

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doi: 10.1016/j.cclet.2024.109908

Receive Date：2023-12-28
Online Date：2025-11-12
Published：2025-02-15

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Received：2023-12-28
Revised：2024-04-11
Accepted：2024-04-17

Affiliations

^a Department of Chemistry, Wuhan University, Wuhan 430072, China

^b State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China

^c State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China

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表12种不同金属材料的力学参数

科 Family	属数 Number of genus	种数 Number of species	占总种数比例 Percentage of total species (%)	属 Genus	种数 Number of species	占总种数比例 Percentage of total species (%)
鹅膏菌科Amanitaceae	2	11	5.26	鹅膏菌属 Amanita	10	4.78
小菇科 Mycenaceae	2	12	5.74	丝盖伞属 Inocybe	5	2.39
多孔菌科 Polyporaceae	8	14	6.70	蜡蘑属 Laccaria	5	2.39
红菇科 Russulaceae	3	23	11.00	小皮伞属 Marasmius	6	2.87
				小菇属 Mycena	11	5.26
				光柄菇属 Pluteus	5	2.39
				红菇属 Russula	17	8.13
				栓菌属 Trametes	5	2.39

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Fig. 1 Elemental image of zebrafish larvae under different exposure conditions. The concentration of NPs was 200 µg/L. And the concentrations of Cd²⁺ were 10 µg/L and 100 µg/L.

Fig. 2 (A) Zn, (B) Cd and (C) Eu contents in zebrafish larvae exposed to Eu-PS/ZnO NPs and Cd²⁺. ^*P < 0.05, ^**P < 0.01, and ^***P < 0.001 represent a significant difference within the groups of 0, ZnO, and Eu-PS, and ^#P < 0.05, ^##P < 0.01, and ^###P < 0.001 represent a significant difference between the groups of 0, 10 and 100 µg/L Cd²⁺.

Fig. 3 The gene expression of (A) ZIP1 and (B) ZIP8 in the exposed zebrafish larvae. ^*P < 0.05, ^**P < 0.01, and ^***P < 0.001 represent a significant difference within the groups of 0, ZnO, and Eu-PS, and ^#P < 0.05, ^##P < 0.01, and ^###P < 0.001 represent a significant difference between the groups of 0, 10 and 100 µg/L Cd²⁺.

Fig. 4 (A) ROS and (B) MDA levels as well as (C) SOD activities and (D) CAT activities. (E) Nrf2 gene expression level and (F) GSH content in the exposed zebrafish larvae. ^*P < 0.05, ^**P < 0.01, and ^***P < 0.001 represent a significant difference within the groups of 0, ZnO, and Eu-PS, and ^#P < 0.05, ^##P < 0.01, and ^###P < 0.001 represent a significant difference between the groups of 0, 10 and 100 µg/L Cd²⁺.

Fig. 5 Possible schematic diagram of the toxic effects caused by bioavailability of Cd on larvae co-exposed to Eu-PS/ZnO NPs and Cd²⁺.

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