Suzhou Environmental Monitor Center

Suzhou, China

Suzhou Environmental Monitor Center

Suzhou, China
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Zhang H.,Soochow University of China | Yao Y.,Suzhou Environmental Monitor Center | Chen Y.,CAS Chongqing Institute of Green and Intelligent Technology | Yue C.,Soochow University of China | And 4 more authors.
Toxicology | Year: 2016

Recent studies have shown an association between congenital heart defects and air fine particle matter (PM2.5), but the molecular mechanisms remain elusive. It is well known that a number of organic compounds in PM2.5 can act as AhR agonists, and activation of AhR can antagonize Wnt/β-catenin signaling. Therefore, we hypothesized that PM2.5 could activate AhR and then repress the expression of wnt/β-catenin targeted genes essential for cardiogenesis, resulting in heart defects. To test this hypothesis, we investigated the effects of extractable organic matter (EOM) from PM2.5 on AhR and Wnt/β-catenin signal pathways in zebrafish embryos. We confirmed that EOM could cause malformations in the heart and decreased heart rate in zebrafish embryos at 72hpf, and found that the EOM-induced heart defects were rescued in embryos co-exposed with EOM plus AhR antagonist CH223191 or β-catenin agonist CHIR99021. We further found that EOM had increased the expression levels of AhR targeted genes (Cyp1a1, Cyp1b1 and Ahrra) and reduced the mRNA levels of β-catenin targeted genes (axin2, nkx2.5 and sox9b). The mRNA expression level of Rspo2, a β-catenin upstream gene, was also decreased in embryos exposed to EOM. Supplementation with CH223191 or CHIR99021 attenuated most of the EOM-induced expression changes of genes involved in both AhR and wnt/β-catenin signal pathways. However, the mRNA expression level of AhR inhibitor Ahrrb, which did not change by EOM treatment alone, was increased in embryos co-exposed to EOM plus CH223191 or CHIR99021. We conclude that the activation of AhR by EOM from PM2.5 might repress wnt/β-catenin signaling, leading to heart defects in zebrafish embryos. Furthermore, our results indicate that the cardiac developmental toxicity of PM2.5 might be prevented by targeting AhR or wnt/β-catenin signaling. © 2016 Elsevier Ireland Ltd.

Su M.,Soochow University of China | Su M.,Suzhou Environmental Monitor Center | Sheng L.,Soochow University of China | Zhao X.,Soochow University of China | And 14 more authors.
Toxicology Research | Year: 2015

Background: Titanium dioxide nanoparticles (TiO2 NPs) have been widely used in industry and daily life; their potential neurotoxic effects are of great concern. The aim of this study is to determine whether exposure to TiO2 NPs mediates neurotrophins and related receptor expression in the hippocampus of mice under TiO2 NPs-induced neuroinflammation. Methods: Mice were nasally administered with 0.25, 0.5, or 1 mg per kg body weight TiO2 NPs for nine months. How neurotrophin-related factors and signaling pathways might be affected by exposure to TiO2 NPs for nine months using real-time PCR and ELISA methods were investigated. Results: The results suggest that exposure to TiO2 NPs caused TiO2 NPs deposition, excessive proliferation of all glial cells and tissue necrosis in the hippocampus. The hippocampal injury due to TiO2 NPs exposure was closely associated with significant reduction in nerve growth factor, brain-derived neurotrophic factor, tyrosine kinases (Trk A, B), calcium/calmodulin-dependent protein kinases (CaMKII, CaMKIV), cyclic-AMP responsive element binding proteins (CREB-1, CREB-2), dopamine receptors (D1, D2) and Tyrosine hydroxylase expression in the hippocampus. Conclusions: The findings imply that long-term exposure to TiO2 NPs may induce neuroinflammation via impairing neurotrophin-mediated signaling pathways in animals. This journal is © The Royal Society of Chemistry 2015.

Sheng L.,Soochow University of China | Wang L.,Soochow University of China | Su M.,Soochow University of China | Su M.,Suzhou Environmental Monitor Center | And 9 more authors.
Environmental Toxicology | Year: 2016

Zebrafish (Danio rerio) has been used historically for evaluating the toxicity of environmental and aqueous toxicants, and there is an emerging literature reporting toxic effects of manufactured nanoparticles (NPs) in zebrafish embryos. Few researches, however, are focused on the neurotoxicity on adult zebrafish after subchronic exposure to TiO2 NPs. This study was designed to evaluate the morphological changes, alterations of neurochemical contents, and expressions of memory behavior-related genes in zebrafish brains caused by exposures to 5, 10, 20, and 40 μg/L TiO2 NPs for 45 consecutive days. Our data indicated that spatial recognition memory and levels of norepinephrine, dopamine, and 5-hydroxytryptamine were significantly decreased and NO levels were markedly elevated, and over proliferation of glial cells, neuron apoptosis, and TiO2 NP aggregation were observed after low dose exposures of TiO2 NPs. Furthermore, the low dose exposures of TiO2 NPs significantly activated expressions of C-fos, C-jun, and BDNF genes, and suppressed expressions of p38, NGF, CREB, NR1, NR2ab, and GluR2 genes. These findings imply that low dose exposures of TiO2 NPs may result in the brain damages in zebrafish, provide a developmental basis for evaluating the neurotoxicity of subchronic exposure, and raise the caution of aquatic application of TiO2 NPs. © 2014 Wiley Periodicals, Inc.

Yin D.-D.,Tsinghua University | Wu J.,Tsinghua University | Xie C.-B.,Tsinghua University | Cao Z.-P.,Tsinghua University | And 2 more authors.
Guang Pu Xue Yu Guang Pu Fen Xi/Spectroscopy and Spectral Analysis | Year: 2013

In recent years, three-dimensional fluorescence spectrometry has been widely used to study the transportation and transformation of the environment pollutants. But little understanding about the relationship between fluorescence characteristics and molecular structure restricts its application. In the present paper, the excitation-emission matrix (EEM) of the typical aromatic pollutants and isomers, phenanthrene and anthracene were studied. The result showed that there existed a peak locating at λex/λem=225/340 nm in the EEM of both phenanthrene and anthracene. Furthermore, the peaks at 275/360 nm of phenanthrene located quite close to the peak of anthracene at 285/360 nm. However, the difference between the EEM of phenanthrene and anthracene was significant. There existed the third fluorescence peak at 275/340 nm and the most intensive peak at 225/340 nm in the EEM of phenanthrene. The EEM of anthracene was more complicated. The most intensive peaks located at λex/λem=250/380, 250/400 and 250/425 nm respectiveoy. In addition, the fluorescence intensity of anthracene at 225/340 nm was about 1.63 times that of phenanthrene when their concentrations were about 0.058 1 mg·L-1. The orbital energy gap of the frontier molecules of phenanthrene and anthracene were 4.779 and 3.621 eV respectively according to the density functional theory. Owe to the smaller energy gap and better symmetry of electron cloud, anthracene was easier to be excited under the excitation of longer wavelength with higher fluorescence intensity. The density functional theory is a good tool to estimate the luminous capability of organic matters.

Shi H.-C.,Tsinghua University | Song B.-D.,Tsinghua University | Long F.,Renmin University of China | Zhou X.-H.,Tsinghua University | And 3 more authors.
Environmental Science and Technology | Year: 2013

The accelerated eutrophication of surface water sources and climate change have led to an annual occurrence of cyanobacterial blooms in many drinking water resources. To minimize the health risks to the public, cyanotoxin detection methods that are rapid, sensitive, real time, and high frequency must be established. In this study, an innovative automated online optical biosensing system (AOBS) was developed for the rapid detection and early warning of microcystin-LR (MC-LR), one of the most toxic cyanotoxins and most frequently detected in environmental water. In this system, the capturing molecular MC-LR-ovalbumin (MC-LR-OVA) was covalently immobilized onto a biochip surface. By an indirect competitive detection mode, samples containing different concentrations of MC-LR were premixed with a certain concentration of fluorescence-labeled anti-MC-LR-mAb, which binds to MC-LR with high specificity. Then, the sample mixture was pumped onto the biochip surface, and a higher concentration of MC-LR led to less fluorescence-labeled antibody bound onto the biochip surface and thus to lower fluorescence signal. The quantification of MC-LR ranges from 0.2 to 4 μg/L, with a detection limit determined as 0.09 μg/L. The high specificity and selectivity of the sensor were evaluated in terms of its response to a number of potentially interfering cyanotoxins. Potential interference of the environmental sample matrix was assessed by spiked samples, and the recovery of MC-LR ranged from 90 to 120% with relative standard deviation values <8%. The immunoassay performance of the AOBS was validated with respect to that of conventional high-performance liquid chromatography, and the correlation between methods agreed well (R2 = 0.9762). This system has successfully been applied to long-term, continuous determination and early warning for MC-LR in Lake Tai from June 2011 to May 2012. Thus, the AOBS paves the way for a vital routine online analysis that satisfies the high demand for ensuring the safety of drinking water sources. The AOBS can also serve as early warning system for accidental or intentional water pollution. © 2013 American Chemical Society.

Wang S.-F.,Southwest University | Wang S.-F.,Tsinghua University | Wu J.,Tsinghua University | Cheng C.,Tsinghua University | And 4 more authors.
Guang Pu Xue Yu Guang Pu Fen Xi/Spectroscopy and Spectral Analysis | Year: 2015

Aqueous fingerprint has an advantage to represent the organic components of water samples as compared to traditional parameters such as chemical oxygen demand (COD) and total organic carbon (TOC). Printing and dyeing wastewater is one of the major types of industrial wastewater in China. It is of huge volume and heavy pollution, containing large numbers of luminescent components and being difficult to be degraded. In this study the aqueous fingerprint of printing and dyeing wastewater was investigated with the fluorescent spectrometry. The experimental results showed that there existed two peaks in the aqueous fingerprint of the printing and dyeing wastewater, locating at the excitation/emission wavelength around 230/340 nm and 280/310 nm respectively. The intensity of the excitation/emission wavelength at 230/340 nm was higher than that of 280/310 nm. The locations and intensities of peaks varied within small range. The intensities of the two peaks linearly correlated with coefficient of 0.9108 and slope of 1.506. The intensity ratio of Peak at 280/310 nm to Peak at 230/340 nm averagely was 0.777, ranging between 0.712 and 0.829. It was found that the aqueous fingerprints of sewage and aniline compounds were significantly different from that of the printing and dyeing wastewater, but the aqueous fingerprints of several types of widely-used dye were similar to that of the printing and dyeing wastewater. Thus dye may be the main luminescent components in the wastewater. The aqueous fingerprint can be used as a novel tool of early warning of waterbodies. © 2015, Science Press. All right reserved.

Wang L.,Soochow University of China | Su M.,Suzhou Environmental Monitor Center | Zhao X.,Soochow University of China | Hong J.,Soochow University of China | And 7 more authors.
Archives of Environmental Contamination and Toxicology | Year: 2015

Bombyx mori (B. mori) is often subjected to phoxim poisoning in China due to phoxim exposure, which leads to a decrease in silk production. Nanoparticulate (NP) titanium dioxide (nano-TiO2) has been shown to attenuate damages in B. mori caused by phoxim exposure. However, little is known about the molecular mechanisms of midgut injury due to organophosphorus insecticide exposure and its repair by nano-TiO2 pretreatment. In this study, phoxim exposure for 36 h led to significant decreases in body weight and survival and increased oxidative stress and midgut injury. Pretreatment with nano-TiO2 attenuated the phoxim-induced midgut injury, increased body weight and survival, and decreased oxidative stress in the midgut of B. mori. Digital gene-expression data showed that exposure to phoxim results in significant changes in the expression of 254 genes in the phoxim-exposed midgut and 303 genes in phoxim + nano-TiO2-exposed midgut. Specifically, phoxim exposure led to upregulation of Tpx, α-amylase, trypsin, and glycoside hydrolase genes involved in digestion and absorption. Phoxim exposure also led to the downregulation of Cyp450 and Cyp4C1 genes involved in an antioxidant capacity. In contrast, a combination of both phoxim and nano-TiO2 treatment significantly decreased the change in α-amylase, trypsin, and glycoside hydrolases (GHs), which are involved in digestion and absorption. These results indicated that Tpx, α-amylase, trypsin, GHs, Cyp450, and Cyp4C1 may be potential biomarkers of midgut toxicity caused by phoxim exposure and the attenuation of these toxic impacts by nano-TiO2. © 2015 Springer Science+Business Media.

PubMed | Suzhou Environmental Monitor Center and Soochow University of China
Type: Journal Article | Journal: Environmental toxicology | Year: 2016

Titanium dioxide nanoparticles (TiO2 NPs) have been used in environmental management, food, medicine, and industry. But TiO2 NPs have been demonstrated to cross the blood-brain barrier and store up in the brain organization, leading to glutamate-mediated neurotoxicity. However, the neurotoxicity in the brain is not well understood. In this study, mice were exposed to 1.25, 2.5, or 5 mg/kg body weight TiO2 NPs for 9 months, and the glutamate-glutamine cyclic pathway and expressions of glutamate receptors associated with the hippocampal neurotoxicity were investigated. Our findings showed elevations of glutamate release and phosphate-activated glutaminase activity, and reductions in glutamine and glutamine synthetase in the hippocampus following exposure to TiO2 NPs. Furthermore, TiO2 NPs significantly inhibited the expression of N-methyl-d-aspartate receptor subunits (including NR1, NR2A, and NR2B) and metabotropic glutamate receptor 2 in mouse hippocampus. These findings suggest that the imbalance of glutamate metabolism triggered inhibitions of glutamate receptor expression in the TiO2 NP-exposed hippocampus. 2014 Wiley Periodicals, Inc. Environ Toxicol 31: 655-662, 2016.

Lu F.,Soochow University of China | Lu F.,CAS Suzhou Institute of Nano Technology and Nano Bionics | Wang L.,CAS Suzhou Institute of Nano Technology and Nano Bionics | Wu F.,Suzhou Environmental Monitor Center | And 5 more authors.
Microchimica Acta | Year: 2011

We have examined the specificity of electrosynthesized poly-o-phenylenediamine as a kind of material molecularly imprinted with metal chelates. Molecularly imprinted polymers (MIPs) were prepared in situ by an electrochemical method. The EDTA chelate complexes of Cu(II), Zn(II), Fe(III) and Cd(II) ions were used as templates of the MIPs deposited on a gold electrode of a quartz crystal microbalance (QCM). The binding ability and specificity of the MIPs were investigated via the frequency response of the QCM to the adsorption of the template chelates and their analogs. Linear relationships are observed between the frequency shift and the concentration of the template chelates over a typical range of ~10-6 to ~10-4 mol·L-1. The results reveal good binding specificity of such MIPs for their templates over structurally related analogs, but the selectivity coefficients are less significant than that for enantiomers. The results also suggest no significant correlation between binding specificity and the ionic (or atomic) radius of the investigated metal ions. The observed specificity is qualitatively attributed to the overall conformational difference of the metal-EDTA complexes resulting from their difference in both ionic radius and electronic structures. © 2011 Springer-Verlag.

Wang L.-Y.,CAS Suzhou Institute of Nano Technology and Nano Bionics | Lu F.,Soochow University of China | Wu F.-Q.,Suzhou Environmental Monitor Center | Gu R.-A.,Soochow University of China | And 3 more authors.
Wuli Huaxue Xuebao/ Acta Physico - Chimica Sinica | Year: 2011

Novel molecularly imprinted polymers (MIPs) were synthesized by the electrochemical polymerization of o-phenylenediamine (o-PD) using cyclic voltammetry in the presence of Cu(II)-ethylenediaminetetraacetate chelate (Cu(II)-EDTA), which acted as a template. The resultant polymers were characterized by UV-Vis spectroscopy, X-ray photoelectron spectroscopy (XPS), differential pulse voltammetry (DPV), and quartz crystal microbalance (QCM). UV-Vis spectral analysis indicated that a higher degree poly-o-phenylenediamine (PoPD) was obtained at pH≥5.0. XPS analysis clearly showed the successful embedding of a Cu(II)-EDTA chelate in the PoPD film and, therefore, hydrogen bonding was a major interaction between the template and the PoPD film. DPV analysis confirmed the successful removal of the template from the PoPD film. The QCM test showed that the Cu(II)-EDTA imprinted PoPD film had good Cu(II)-EDTAchelate sensitivity. © Editorial office of Acta Physico-Chimica Sinica.

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