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Long J, Liang J, Liu T, Huang H, Chen J, Liao Q, Pang L, Yang K, Chen M, Chen Q, Huang X, Zhu Q, Zeng X, Huang D, Qiu X. Association between prenatal exposure to alkylphenols and intelligence quotient among preschool children: sex-specific effects. Environ Health 2024; 23:21. [PMID: 38365736 PMCID: PMC10870542 DOI: 10.1186/s12940-024-01047-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2023] [Accepted: 01/05/2024] [Indexed: 02/18/2024]
Abstract
BACKGROUND While prenatal exposure to alkylphenols (APs) has been demonstrated to be associated with neurodevelopmental impairments in animals, the evidence from epidemiological studies remains limited and inconclusive. This study aimed to explore the link between AP exposure during pregnancy and the intelligence quotient (IQ) of preschool children. METHODS A total of 221 mother-child pairs from the Guangxi Zhuang Birth Cohort were recruited. Nonylphenol (NP), 4-tert-octylphenol (4-T-OP), 4-n-nonylphenol (4-N-NP), and 4-n-octylphenol were measured in maternal serum in early pregnancy. Childhood IQ was evaluated by the Fourth Edition of Wechsler Preschool and Primary Scale of the Intelligence at 3 to 6 years of age. The impact of APs on childhood IQ were evaluated by generalized linear models (GLMs), restricted cubic spline (RCS), and Bayesian kernel machine regression (BKMR). RESULTS In GLMs, prenatal exposure to NP and the second tertile of 4-T-OP exhibited an inverse association with full-scale IQ (FSIQ) (β = -2.38; 95% CI: -4.59, -0.16) and working memory index (WMI) (β = -5.24; 95% CI: -9.58, -0.89), respectively. Prenatal exposure to the third tertile of 4-N-NP showed a positive association with the fluid reasoning index (β = 4.95; 95% CI: 1.14, 8.77) in total children, as well as in girls when stratified by sex. A U-shaped relationship between maternal 4-T-OP and WMI was noted in total children and girls by RCS (all P nonlinear < 0.05). The combined effect primarily driven by NP, of maternal AP mixtures at concentrations above the 50th percentile exhibited an inverse trend on FSIQ in total children and girls in BKMR. CONCLUSIONS Prenatal exposure to various APs affects IQ in preschool children, and there may be nonmonotonic and sex-specific effects. Further investigation across the population is required to elucidate the potential neurotoxic effects of APs.
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Affiliation(s)
- Jinghua Long
- Department of Epidemiology and Health Statistics, School of Public Health, Guangxi Medical University, No. 22 Shuangyong Road, Nanning, 530021, Guangxi, China
- The First Affiliated Hospital of Guangxi Medical University, Nanning, 530021, Guangxi, China
| | - Jun Liang
- Department of Epidemiology and Health Statistics, School of Public Health, Guangxi Medical University, No. 22 Shuangyong Road, Nanning, 530021, Guangxi, China
| | - Tao Liu
- Huaihua Center for Disease Control and Prevention, Huaihua, 418000, Hunan, China
| | - Huishen Huang
- Department of Epidemiology and Health Statistics, School of Public Health, Guangxi Medical University, No. 22 Shuangyong Road, Nanning, 530021, Guangxi, China
| | - Jiehua Chen
- Department of Epidemiology and Health Statistics, School of Public Health, Guangxi Medical University, No. 22 Shuangyong Road, Nanning, 530021, Guangxi, China
| | - Qian Liao
- Department of Epidemiology and Health Statistics, School of Public Health, Guangxi Medical University, No. 22 Shuangyong Road, Nanning, 530021, Guangxi, China
| | - Lixiang Pang
- Department of Sanitary Chemistry, School of Public Health, Guangxi Medical University, No. 22 Shuangyong Road, Nanning, 530021, Guangxi, China
| | - Kaiqi Yang
- Department of Sanitary Chemistry, School of Public Health, Guangxi Medical University, No. 22 Shuangyong Road, Nanning, 530021, Guangxi, China
| | - Manlin Chen
- Department of Sanitary Chemistry, School of Public Health, Guangxi Medical University, No. 22 Shuangyong Road, Nanning, 530021, Guangxi, China
| | - Qian Chen
- Department of Sanitary Chemistry, School of Public Health, Guangxi Medical University, No. 22 Shuangyong Road, Nanning, 530021, Guangxi, China
| | - Xiaorong Huang
- Department of Sanitary Chemistry, School of Public Health, Guangxi Medical University, No. 22 Shuangyong Road, Nanning, 530021, Guangxi, China
| | - Qihua Zhu
- Department of Sanitary Chemistry, School of Public Health, Guangxi Medical University, No. 22 Shuangyong Road, Nanning, 530021, Guangxi, China
| | - Xiaoyun Zeng
- Department of Epidemiology and Health Statistics, School of Public Health, Guangxi Medical University, No. 22 Shuangyong Road, Nanning, 530021, Guangxi, China
| | - Dongping Huang
- Department of Sanitary Chemistry, School of Public Health, Guangxi Medical University, No. 22 Shuangyong Road, Nanning, 530021, Guangxi, China.
| | - Xiaoqiang Qiu
- Department of Epidemiology and Health Statistics, School of Public Health, Guangxi Medical University, No. 22 Shuangyong Road, Nanning, 530021, Guangxi, China.
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Li Z, Liu H, Han W, Zhu S, Liu C. NMN Alleviates NP-Induced Learning and Memory Impairment Through SIRT1 Pathway in PC-12 Cell. Mol Neurobiol 2023; 60:2871-2883. [PMID: 36745337 DOI: 10.1007/s12035-023-03251-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2022] [Accepted: 01/28/2023] [Indexed: 02/07/2023]
Abstract
Nonylphenol (NP) is widely used in the chemical industry; it accumulates in organisms through environmental contamination and causes learning memory impairment. Nicotinamide mononucleotide (NMN) has been found to have a positive effect on the treatment of central nervous-related diseases. This study aimed to investigate the protective effect of NMN on NP-induced learning memory-related impairment in vitro and to further identify the underlying mechanisms. The results showed that NP induced oxidative stress and impaired the cholinergic system, 5-HT system in PC-12 cells. NMN alleviated NP-induced learning and memory impairment at the molecular level through alleviating oxidative stress and protective effects on the 5-HT system and cholinergic system. The 50 μM NP group significantly reduced the NAD+ content, and the relative expression of SIRT1, PGC-1α, Nrf2, MAOA, BDNF, and p-TrkB were significantly downregulated. Co-treatment of NMN with NP significantly reduced oxidative stress, improved the homeostasis of 5-HT and cholinergic system, enhanced the intracellular NAD+ content, and significantly upregulated the expression of SIRT1 pathway proteins. SIRT1 inhibitors reduced the expression of SIRT1 pathway-related proteins, which implied the impairment of learning and memory by NP and the protective effect of NMN might be achieved through the SIRT1-mediated PGC-1α/MAOA/BDNF signaling pathway. Overall, this study not only help us to understand the toxic mechanism of NP on learning memory impairment in vitro, but also have important reference significance to further explore the health care value of NMN and promote the development of related functional foods.
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Affiliation(s)
- Zhongyi Li
- College of Food Science, South China Agricultural University, 483#, Wu-Shan Ave., Tian-He District, Guangzhou, 510642, China
- Guangdong Provincial Key Laboratory of Food Quality and Safety, Guangzhou, 510642, China
| | - Huan Liu
- College of Food Science, South China Agricultural University, 483#, Wu-Shan Ave., Tian-He District, Guangzhou, 510642, China
- Guangdong Provincial Key Laboratory of Food Quality and Safety, Guangzhou, 510642, China
| | - Wenna Han
- College of Food Science, South China Agricultural University, 483#, Wu-Shan Ave., Tian-He District, Guangzhou, 510642, China
- Guangdong Provincial Key Laboratory of Food Quality and Safety, Guangzhou, 510642, China
| | - Siyu Zhu
- College of Food Science, South China Agricultural University, 483#, Wu-Shan Ave., Tian-He District, Guangzhou, 510642, China
- Guangdong Provincial Key Laboratory of Food Quality and Safety, Guangzhou, 510642, China
| | - Chunhong Liu
- College of Food Science, South China Agricultural University, 483#, Wu-Shan Ave., Tian-He District, Guangzhou, 510642, China.
- Guangdong Provincial Key Laboratory of Food Quality and Safety, Guangzhou, 510642, China.
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Zhang Y, Li S, Wu J, Peng Y, Bai J, Ning B, Wang X, Fang Y, Han D, Ren S, Li S, Chen R, Li K, Du H, Gao Z. The orphan nuclear receptor Nur77 plays a vital role in BPA-induced PC12 cell apoptosis. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2021; 213:112026. [PMID: 33582411 DOI: 10.1016/j.ecoenv.2021.112026] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/29/2020] [Revised: 01/31/2021] [Accepted: 02/01/2021] [Indexed: 06/12/2023]
Abstract
Bisphenol A (BPA) is a typical environmental endocrine disruptor that can migrate into organisms through skin contact, breathing, diet and various other approaches. The reproductive toxicity and neurotoxicity of BPA has been confirmed by several toxicological studies. However, the neurotoxicity of BPA is still controversial. In the present study, we used PC12 cells as a model to investigate the mechanism of BPA-induced neuronal apoptosis. BPA exposure reduced cell viability, altered cell morphology and aggravated intracellular Lactate dehydrogenase (LDH) release, intracellular Ca2+ concentration, Reactive oxygen species (ROS) levels, apoptosis and the reduction in the mitochondrial transmembrane potential (ΔΨm). Moreover, the results of the Western blot (WB) and Real-time quantitative polymerase chain reaction (RT-qPCR) assays indicated that the expression levels of Nur77 in the BPA group were down-regulated and accompanied by the downregulation of the NF-κb/Bcl-2 proteins and the upregulation of cleaved-caspase 3, which is a marker of apoptosis. However, these changes were significantly reversed with the upregulation of the Nur77 protein by introducing plasmids carrying the nur77 gene. These results indicated that BPA-induced apoptosis was closely related to Nur77-mediated inhibition of the NF-κb/Bcl-2 pathway.
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Affiliation(s)
- Yingchun Zhang
- Tianjin Institute of Environmental and Operational Medicine, Tianjin Key Laboratory of Risk Assessment and Control Technology for Environment and Food Safety, 1 Da Li Road, Tianjin 300050, PR China; Nankai University School of Medicine, Nan Kai University, 94 Weijin Road, Tianjin 300071, PR China
| | - Shuang Li
- Tianjin Institute of Environmental and Operational Medicine, Tianjin Key Laboratory of Risk Assessment and Control Technology for Environment and Food Safety, 1 Da Li Road, Tianjin 300050, PR China; Academy of Medical Engineering and Translational Medicine, Tianjin University, 92 Weijin Road, Tianjin 300072, PR China.
| | - Jin Wu
- Tianjin Institute of Environmental and Operational Medicine, Tianjin Key Laboratory of Risk Assessment and Control Technology for Environment and Food Safety, 1 Da Li Road, Tianjin 300050, PR China
| | - Yuan Peng
- Tianjin Institute of Environmental and Operational Medicine, Tianjin Key Laboratory of Risk Assessment and Control Technology for Environment and Food Safety, 1 Da Li Road, Tianjin 300050, PR China
| | - Jialei Bai
- Tianjin Institute of Environmental and Operational Medicine, Tianjin Key Laboratory of Risk Assessment and Control Technology for Environment and Food Safety, 1 Da Li Road, Tianjin 300050, PR China
| | - Baoan Ning
- Tianjin Institute of Environmental and Operational Medicine, Tianjin Key Laboratory of Risk Assessment and Control Technology for Environment and Food Safety, 1 Da Li Road, Tianjin 300050, PR China
| | - Xinxing Wang
- Tianjin Institute of Environmental and Operational Medicine, Tianjin Key Laboratory of Risk Assessment and Control Technology for Environment and Food Safety, 1 Da Li Road, Tianjin 300050, PR China
| | - Yanjun Fang
- Tianjin Institute of Environmental and Operational Medicine, Tianjin Key Laboratory of Risk Assessment and Control Technology for Environment and Food Safety, 1 Da Li Road, Tianjin 300050, PR China
| | - Dianpeng Han
- Tianjin Institute of Environmental and Operational Medicine, Tianjin Key Laboratory of Risk Assessment and Control Technology for Environment and Food Safety, 1 Da Li Road, Tianjin 300050, PR China
| | - Shuyue Ren
- Tianjin Institute of Environmental and Operational Medicine, Tianjin Key Laboratory of Risk Assessment and Control Technology for Environment and Food Safety, 1 Da Li Road, Tianjin 300050, PR China
| | - Sen Li
- Tianjin Institute of Environmental and Operational Medicine, Tianjin Key Laboratory of Risk Assessment and Control Technology for Environment and Food Safety, 1 Da Li Road, Tianjin 300050, PR China
| | - Ruipeng Chen
- Tianjin Institute of Environmental and Operational Medicine, Tianjin Key Laboratory of Risk Assessment and Control Technology for Environment and Food Safety, 1 Da Li Road, Tianjin 300050, PR China
| | - Kang Li
- Tianjin Institute of Environmental and Operational Medicine, Tianjin Key Laboratory of Risk Assessment and Control Technology for Environment and Food Safety, 1 Da Li Road, Tianjin 300050, PR China
| | - Hongwei Du
- Nankai University School of Medicine, Nan Kai University, 94 Weijin Road, Tianjin 300071, PR China
| | - Zhixian Gao
- Tianjin Institute of Environmental and Operational Medicine, Tianjin Key Laboratory of Risk Assessment and Control Technology for Environment and Food Safety, 1 Da Li Road, Tianjin 300050, PR China.
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Jia Y, Sun R, Ding X, Cao C, Yang X. Bisphenol S Triggers the Migration and Invasion of Pheochromocytoma PC12 Cells via Estrogen-Related Receptor α. J Mol Neurosci 2018; 66:188-196. [PMID: 30140998 DOI: 10.1007/s12031-018-1148-5] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2018] [Accepted: 07/27/2018] [Indexed: 12/13/2022]
Abstract
Pheochromocytoma (PCC) is a tumor of the adrenal medulla for which surgical resection is the only therapy approach. Risk factors responsible for the tumorigenesis and progression of PCC are not well illustrated. Our present study revealed that an industrial chemical, bisphenol S (BPS), can promote the migration and invasion of PCC PC12 cells, which was evidenced by the upregulation of fibronectin (FN) and matrix metalloproteinases (MMP-2 and MMP-9). The inhibitor of estrogen-related receptor α (ERRα), while not estrogen receptor α/β (ERα/β) or G protein-coupled estrogen receptor (GPER), can attenuate BPS-induced cell migration. Mechanically, BPS can increase the binding between ERRα and promoter of FN1 and then induce the expression of FN in PC12 cells. Further, BPS can induce the expression of miR-10b in PC12 cells via ERRα. The upregulated miR-10b inhibited the expression of KLF4, which can suppress the migration and invasion of cancer cells. BPS can trigger the mRNA and protein expression of ERRα in PC12 cells via a time-dependent manner. Collectively, our study revealed that nanomolar BPS can trigger the migration and invasion of PC12 cells via activation and upregulation of ERRα.
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Affiliation(s)
- Yuefeng Jia
- Department of Urology, The Affiliated Hospital of Qingdao University, No.16 of Jiangsu Road, Qingdao, 266003, China
| | - Ruixia Sun
- Department of Endocrinology and Metabology, The Affiliated Hospital of Qingdao University, No.16 of Jiangsu Road, Qingdao, 266003, China
| | - Xuemei Ding
- Department of Surgery, The Affiliated Hospital of Qingdao University, No.16 of Jiangsu Road, Qingdao, 266003, China
| | - Caixia Cao
- Department of Endocrinology and Metabology, The Affiliated Hospital of Qingdao University, No.16 of Jiangsu Road, Qingdao, 266003, China.
| | - Xuecheng Yang
- Department of Urology, The Affiliated Hospital of Qingdao University, No.16 of Jiangsu Road, Qingdao, 266003, China.
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Acir IH, Guenther K. Endocrine-disrupting metabolites of alkylphenol ethoxylates - A critical review of analytical methods, environmental occurrences, toxicity, and regulation. THE SCIENCE OF THE TOTAL ENVIRONMENT 2018; 635:1530-1546. [PMID: 29874777 DOI: 10.1016/j.scitotenv.2018.04.079] [Citation(s) in RCA: 98] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2018] [Revised: 04/03/2018] [Accepted: 04/05/2018] [Indexed: 05/07/2023]
Abstract
Despite the fact that metabolites of alkylphenol ethoxylates (APEO) are classified as hazardous substances, they continue to be released into the environment from a variety of sources and are not usually monitored. Their wide use has led to an increase in the possible exposure pathways for humans, which is cause for alarm. Moreover, there is a lack of knowledge about the behaviour of these metabolites with respect to the environment and toxicity, and their biological effects on human health. The aim of this work is to give an overview of the APEO metabolites and their analysis, occurrences and toxicity in various environmental and human samples. APEO metabolites have adverse effects on humans, wildlife, and the environment through their release into the environment. Currently, there are some reviews available on the behaviour of alkylphenols in soil, sediments, groundwater, surface water and food. However, none of these articles consider their toxicity in humans and especially their effect on the nervous and immune system. This work summarises the environmental occurrences of metabolites of APEOs in matrices, e.g. water, food and biological matrices, their effect on the immune and nervous systems, and isomer-specific issues. With that emphasis we are able to cover most common occurrences of human exposure, whether direct or indirect.
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Affiliation(s)
- Ismail-H Acir
- University of Bonn, Institute of Nutrition and Food Sciences, Food Chemistry, Endenicher Allee 11-13, D-53115 Bonn, Germany
| | - Klaus Guenther
- University of Bonn, Institute of Nutrition and Food Sciences, Food Chemistry, Endenicher Allee 11-13, D-53115 Bonn, Germany.
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Abstract
Endocrine-disrupting chemicals (EDCs) influence not only endocrine functions but also neuronal development and functions. In-vivo studies have suggested the relationship of EDC-induced neurobehavioral disorders with dysfunctions of neurotransmitter mechanisms including γ-aminobutyric acid (GABA)ergic mechanisms. However, whether EDCs affect GABAergic neuron differentiation remains unclear. In the present study, we show that a representative EDC, bisphenol A (BPA), affects GABAergic neuron differentiation. Cortical neurospheres prepared from embryonic mice were exposed to BPA for 7 days, and then neuronal differentiation was induced. We found that BPA exposure resulted in a decrease in the ratio of GABAergic neurons to total neurons. However, the same exposure stimulated the differentiation of neurons expressing calbindin, a calcium-binding protein observed in a subpopulation of GABAergic neurons. These findings suggested that BPA might influence the formation of an inhibitory neuronal network in developing cerebral cortex involved in the occurrence of neurobehavioral disorders.
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Bi RY, Meng Z, Zhang P, Wang XD, Ding Y, Gan YH. Estradiol upregulates voltage-gated sodium channel 1.7 in trigeminal ganglion contributing to hyperalgesia of inflamed TMJ. PLoS One 2017; 12:e0178589. [PMID: 28582470 PMCID: PMC5459440 DOI: 10.1371/journal.pone.0178589] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2016] [Accepted: 05/15/2017] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Temporomandibular disorders (TMDs) have the highest prevalence in women of reproductive age. The role of estrogen in TMDs and especially in TMDs related pain is not fully elucidated. Voltage-gated sodium channel 1.7 (Nav1.7) plays a prominent role in pain perception and Nav1.7 in trigeminal ganglion (TG) is involved in the hyperalgesia of inflamed Temporomandibular joint (TMJ). Whether estrogen could upregulate trigeminal ganglionic Nav1.7 expression to enhance hyperalgesia of inflamed TMJ remains to be explored. METHODS Estrous cycle and plasma levels of 17β-estradiol in female rats were evaluated with vaginal smear and enzyme linked immunosorbent assay, respectively. Female rats were ovariectomized and treated with 17β-estradiol at 0 μg, 20 μg and 80 μg, respectively, for 10 days. TMJ inflammation was induced using complete Freund's adjuvant. Head withdrawal thresholds and food intake were measured to evaluate the TMJ nociceptive responses. The expression of Nav1.7 in TG was examined using real-time PCR and western blot. The activity of Nav1.7 promoter was examined using luciferase reporter assay. The locations of estrogen receptors (ERα and ERβ), the G protein coupled estrogen receptor (GPR30), and Nav1.7 in TG were examined using immunohistofluorescence. RESULTS Upregulation of Nav1.7 in TG and decrease in head withdrawal threshold were observed with the highest plasma 17β-estradiol in the proestrus of female rats. Ovariectomized rats treated with 80 μg 17β-estradiol showed upregulation of Nav1.7 in TG and decrease in head withdrawal threshold as compared with that of the control or ovariectomized rats treated with 0 μg or 20 μg. Moreover, 17β-estradiol dose-dependently potentiated TMJ inflammation-induced upregulation of Nav1.7 in TG and also enhanced TMJ inflammation-induced decrease of head withdrawal threshold in ovariectomized rats. In addition, the estrogen receptor antagonist, ICI 182,780, partially blocked the 17β-estradiol effect on Nav1.7 expression and head withdrawal threshold in ovariectomized rats. ERα and ERβ, but not GPR30, were mostly co-localized with Nav1.7 in neurons in TG. In the nerve growth factor-induced and ERα-transfected PC12 cells, 17β-estradiol dose-dependently enhanced Nav1.7 promoter activity, whereas mutations of the estrogen response element at -1269/-1282 and -1214/-1227 in the promoter completely abolished its effect on the promoter activity. CONCLUSION Estradiol could upregulate trigeminal ganglionic Nav1.7 expression to contribute to hyperalgesia of inflamed TMJ.
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Affiliation(s)
- Rui-Yun Bi
- The Third Dental Center, Peking University School and Hospital of Stomatology, Haidian District, Beijing, China
| | - Zhen Meng
- Central laboratory, Peking University School and Hospital of Stomatology, Haidian District, Beijing, China
| | - Peng Zhang
- Central laboratory, Peking University School and Hospital of Stomatology, Haidian District, Beijing, China
- Center for Temporomandibular Disorders & Orofacial Pain, Peking University School and Hospital of Stomatology, Haidian District, Beijing, China
| | - Xue-Dong Wang
- The Department of Orthodontics, Peking University School and Hospital of Stomatology, Haidian District, Beijing, China
| | - Yun Ding
- The Third Dental Center, Peking University School and Hospital of Stomatology, Haidian District, Beijing, China
- * E-mail: (YD); (YHG)
| | - Ye-Hua Gan
- Central laboratory, Peking University School and Hospital of Stomatology, Haidian District, Beijing, China
- Center for Temporomandibular Disorders & Orofacial Pain, Peking University School and Hospital of Stomatology, Haidian District, Beijing, China
- * E-mail: (YD); (YHG)
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Litwa E, Rzemieniec J, Wnuk A, Lason W, Krzeptowski W, Kajta M. RXRα, PXR and CAR xenobiotic receptors mediate the apoptotic and neurotoxic actions of nonylphenol in mouse hippocampal cells. J Steroid Biochem Mol Biol 2016; 156:43-52. [PMID: 26643981 DOI: 10.1016/j.jsbmb.2015.11.018] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/03/2015] [Revised: 11/21/2015] [Accepted: 11/26/2015] [Indexed: 12/26/2022]
Abstract
In the present study, we investigated the role of the retinoid X receptor (RXR), the pregnane X receptor (PXR) and the constitutive androstane receptor (CAR), in the apoptotic and toxic effects of nonylphenol in mouse primary neuronal cell cultures. Our study demonstrated that nonylphenol activated caspase-3 and induced lactate dehydrogenase (LDH) release in hippocampal cells, which was accompanied by an increase in the mRNA expression and protein levels of RXRα, PXR and CAR. Nonylphenol stimulated Rxra, Pxr, and Car mRNA expression. These effects were followed by increase in the protein levels of particular receptors. Immunofluorescence labeling revealed the cellular distribution of RXRα, PXR and CAR in hippocampal neurons in response to nonylphenol, shortening of neurites and cytoplasmic shrinking, as indicated by MAP2 staining. It also showed NP-induced translocation of receptor-specific immunofluorescence from cytoplasm to the nucleus. The use of specific siRNAs demonstrated that Rxra-, Pxr-, and Car-siRNA-transfected cells were less vulnerable to nonylphenol-induced activation of caspase-3 and LDH, thus confirming the key involvement of RXRα/PXR/CAR signaling pathways in the apoptotic and neurotoxic actions of nonylphenol. These new data give prospects for the targeting xenobiotic nuclear receptors to protect the developing nervous system against endocrine disrupting chemicals.
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Affiliation(s)
- E Litwa
- Department of Experimental Neuroendocrinology, Institute of Pharmacology, Polish Academy of Sciences, 12 Smetna Street, 31-343 Krakow, Poland
| | - J Rzemieniec
- Department of Experimental Neuroendocrinology, Institute of Pharmacology, Polish Academy of Sciences, 12 Smetna Street, 31-343 Krakow, Poland
| | - A Wnuk
- Department of Experimental Neuroendocrinology, Institute of Pharmacology, Polish Academy of Sciences, 12 Smetna Street, 31-343 Krakow, Poland
| | - W Lason
- Department of Experimental Neuroendocrinology, Institute of Pharmacology, Polish Academy of Sciences, 12 Smetna Street, 31-343 Krakow, Poland
| | - W Krzeptowski
- Department of Cell Biology and Imaging, Confocal Microscopy Laboratory, Institute of Zoology, Jagiellonian University, 9 Gronostajowa Street, 30-387 Krakow, Poland
| | - M Kajta
- Department of Experimental Neuroendocrinology, Institute of Pharmacology, Polish Academy of Sciences, 12 Smetna Street, 31-343 Krakow, Poland.
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Visualized gene network reveals the novel target transcripts Sox2 and Pax6 of neuronal development in trans-placental exposure to bisphenol A. PLoS One 2014; 9:e100576. [PMID: 25051057 PMCID: PMC4106758 DOI: 10.1371/journal.pone.0100576] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2014] [Accepted: 05/26/2014] [Indexed: 12/12/2022] Open
Abstract
Background Bisphenol A (BPA) is a ubiquitous endocrine disrupting chemical in our daily life, and its health effect in response to prenatal exposure is still controversial. Early-life BPA exposure may impact brain development and contribute to childhood neurological disorders. The aim of the present study was to investigate molecular target genes of neuronal development in trans-placental exposure to BPA. Methodology A meta-analysis of three public microarray datasets was performed to screen for differentially expressed genes (DEGs) in exposure to BPA. The candidate genes of neuronal development were identified from gene ontology analysis in a reconstructed neuronal sub-network, and their gene expressions were determined using real-time PCR in 20 umbilical cord blood samples dichotomized into high and low BPA level groups upon the median 16.8 nM. Principal Findings Among 36 neuronal transcripts sorted from DAVID ontology clusters of 457 DEGs using the analysis of Bioconductor limma package, we found two neuronal genes, sex determining region Y-box 2 (Sox2) and paired box 6 (Pax6), had preferentially down-regulated expression (Bonferroni correction p-value <10−4 and log2-transformed fold change ≤−1.2) in response to BPA exposure. Fetal cord blood samples had the obviously attenuated gene expression of Sox2 and Pax6 in high BPA group referred to low BPA group. Visualized gene network of Cytoscape analysis showed that Sox2 and Pax6 which were contributed to neural precursor cell proliferation and neuronal differentiation might be down-regulated through sonic hedgehog (Shh), vascular endothelial growth factor A (VEGFA) and Notch signaling. Conclusions These results indicated that trans-placental BPA exposure down-regulated gene expression of Sox2 and Pax6 potentially underlying the adverse effect on childhood neuronal development.
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