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Marycz K, Wiatrak B, Irwin-Houston JM, Marcinkowska K, Mularczyk M, Bourebaba L. Sex hormone binding globulin (SHBG) modulates mitochondrial dynamics in PPARγ-depleted equine adipose derived stromal cells. J Mol Med (Berl) 2024; 102:1015-1036. [PMID: 38874666 PMCID: PMC11269461 DOI: 10.1007/s00109-024-02459-z] [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: 06/27/2023] [Revised: 03/28/2024] [Accepted: 06/05/2024] [Indexed: 06/15/2024]
Abstract
Peroxisome proliferator-activated receptor gamma (PPARγ) is a transcription factor that promotes adipogenesis, lipid uptake and storage, insulin sensitivity, and glucose metabolism. Hence, defects in PPARγ have been associated to the development of metabolic disorders. Sex hormone-binding globulin (SHBG) is a glycoprotein primarily produced in the liver that regulates the bioavailability of sex hormones. Alike PPARγ, low SHBG levels have been correlated with insulin resistance and associated endocrine abnormalities. Therefore, this study aimed to verify whether SHBG may restore depleted PPARγ functions and thus serve as a new candidate for the management of metabolic conditions. A model of equine adipose-derived stromal cells (EqASCs) has been used, in which a PPARγ silencing and SHBG treatment have been achieved to determine the changes in cell viability, premature senescence, oxidative stress, and mitochondrial functions. Obtained data demonstrated that loss in PPARγ triggers cell apoptosis which is not reversed by SHBG application. Moreover, PPARγ knockdown cells exhibited premature senescence, which has been substantially alleviated by SHBG concomitantly to increased BAX/BCL2 ratio, suggesting a possible effect on senescence-induced apoptosis resistance. Interestingly, PPARγ silencing induced a significant alteration in mitochondrial membrane potential as well as the expression of dynamics and metabolism-related markers. SHBG treatment enabled to ameliorate the transmembrane potential, to normalize the expression levels of key dynamics and metabolism mediators, and to restore the protein levels of PINK, which is critically involved in mitochondria recycling machinery. Presented data suggest that SHBG may provide new mechanistic insights into the regulation of PPARγ functions, and thus offers a preliminary picture on a possible SHBG-PPARγ metabolic crosstalk. KEY MESSAGES : PPARγ is a transcription factor that tightly regulates cell metabolism. Low SHBG levels correlate with insulin resistance and associated endocrine abnormalities. PPARγ silencing reduces cell viability, triggers premature senescence and profound mitochondrial failure in equine ASCs. SHBG protein reverses senescent phenotype and apoptosis resistance of PPARγ- ASCs. SHBG improves mitochondrial dynamics and metabolism following PPARγ knockdown. SHBG might serve as a PPARγ potential mimicking agent for the modulation of ASCs metabolic processes.
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Affiliation(s)
- Krzysztof Marycz
- Department of Experimental Biology, Faculty of Biology and Animal Science, Wrocław University of Environmental and Life Sciences, Norwida 27B, 50-375, Wrocław, Poland
- International Institute of Translational Medicine, Jesionowa 11, Malin, 55-114, Wisznia Mała, Poland
- Department of Medicine and Epidemiology, School of Veterinary Medicine, University of California, Davis, Davis, CA, 95516, USA
| | - Benita Wiatrak
- Department of Experimental Biology, Faculty of Biology and Animal Science, Wrocław University of Environmental and Life Sciences, Norwida 27B, 50-375, Wrocław, Poland
| | - Jennifer M Irwin-Houston
- Department of Experimental Biology, Faculty of Biology and Animal Science, Wrocław University of Environmental and Life Sciences, Norwida 27B, 50-375, Wrocław, Poland
| | - Klaudia Marcinkowska
- Department of Experimental Biology, Faculty of Biology and Animal Science, Wrocław University of Environmental and Life Sciences, Norwida 27B, 50-375, Wrocław, Poland
| | - Malwina Mularczyk
- Department of Experimental Biology, Faculty of Biology and Animal Science, Wrocław University of Environmental and Life Sciences, Norwida 27B, 50-375, Wrocław, Poland
- International Institute of Translational Medicine, Jesionowa 11, Malin, 55-114, Wisznia Mała, Poland
| | - Lynda Bourebaba
- Department of Experimental Biology, Faculty of Biology and Animal Science, Wrocław University of Environmental and Life Sciences, Norwida 27B, 50-375, Wrocław, Poland.
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Gu Y, Jin CX, Tong ZH, Jiang T, Yao FC, Zhang Y, Huang J, Song FB, Sun JL, Luo J. Expression of genes related to gonadal development and construction of gonadal DNA methylation maps of Trachinotus blochii under hypoxia. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 935:173172. [PMID: 38740210 DOI: 10.1016/j.scitotenv.2024.173172] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/03/2024] [Revised: 04/12/2024] [Accepted: 05/10/2024] [Indexed: 05/16/2024]
Abstract
Chronic hypoxia can affect the growth and metabolism of fish and potentially impact gonadal development through epigenetic regulation. Trachinotus blochii (Golden pompano) is widely cultured near the coast and is sensitive to low oxygen conditions. We found that hypoxia and reoxygenation processes acted on multiple targets on the HPG axis, leading to endocrine disorders. Changes in the expression of key genes in the brain (gnrh), pituitary (fsh and lh), ovaries (cyp19a1a, foxl2, and er), and testes (dmrt1, ar, sox9, and gsdf) were associated with significant decreases in estrogen and testosterone levels. Hypoxia and reoxygenation lead to changes in DNA methylation levels in the gonads. Hypoxia upregulated the expression of dnmt1, dnmt3a, dnmt3b, tet1, and tet2 in females and dnmt3a and dnmt3b in males, while reoxygenation down-regulated the expression of dnmt1, dnmt3a, dnmt3b, tet1, and tet2 in males. Whole genome methylation sequencing showed that the number of differentially methylated regions was highest on chromosome 10 (5192) and lowest on chromosome 24 (275). Differentially methylated genes in females and males, as well as between males and females, were enriched in the oxytocin signaling pathway, fatty acid metabolism pathway, and HIF-1a pathway. In summary, hypoxia and reoxygenation can induce endocrine disorders, affect the expression of HPG axis genes, change the methylation pattern and modification pattern of gonad DNA, and then have potential effects on gonad development.
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Affiliation(s)
- Yue Gu
- School of Marine Biology and Fisheries, Sanya Nanfan Research Institute of Hainan University, Hainan Aquaculture Breeding Engineering Research Center, Hainan Academician Team Innovation Center, Hainan University, Haikou 570228, China
| | - Chun Xiu Jin
- School of Marine Biology and Fisheries, Sanya Nanfan Research Institute of Hainan University, Hainan Aquaculture Breeding Engineering Research Center, Hainan Academician Team Innovation Center, Hainan University, Haikou 570228, China
| | - Zai Hui Tong
- School of Marine Biology and Fisheries, Sanya Nanfan Research Institute of Hainan University, Hainan Aquaculture Breeding Engineering Research Center, Hainan Academician Team Innovation Center, Hainan University, Haikou 570228, China
| | - Tian Jiang
- School of Marine Biology and Fisheries, Sanya Nanfan Research Institute of Hainan University, Hainan Aquaculture Breeding Engineering Research Center, Hainan Academician Team Innovation Center, Hainan University, Haikou 570228, China
| | - Fu Cheng Yao
- School of Marine Biology and Fisheries, Sanya Nanfan Research Institute of Hainan University, Hainan Aquaculture Breeding Engineering Research Center, Hainan Academician Team Innovation Center, Hainan University, Haikou 570228, China
| | - Yu Zhang
- School of Marine Biology and Fisheries, Sanya Nanfan Research Institute of Hainan University, Hainan Aquaculture Breeding Engineering Research Center, Hainan Academician Team Innovation Center, Hainan University, Haikou 570228, China
| | - Jie Huang
- School of Marine Biology and Fisheries, Sanya Nanfan Research Institute of Hainan University, Hainan Aquaculture Breeding Engineering Research Center, Hainan Academician Team Innovation Center, Hainan University, Haikou 570228, China
| | - Fei Biao Song
- School of Marine Biology and Fisheries, Sanya Nanfan Research Institute of Hainan University, Hainan Aquaculture Breeding Engineering Research Center, Hainan Academician Team Innovation Center, Hainan University, Haikou 570228, China
| | - Jun Long Sun
- School of Marine Biology and Fisheries, Sanya Nanfan Research Institute of Hainan University, Hainan Aquaculture Breeding Engineering Research Center, Hainan Academician Team Innovation Center, Hainan University, Haikou 570228, China.
| | - Jian Luo
- School of Marine Biology and Fisheries, Sanya Nanfan Research Institute of Hainan University, Hainan Aquaculture Breeding Engineering Research Center, Hainan Academician Team Innovation Center, Hainan University, Haikou 570228, China.
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Ihn Y, Cho Y, Lee Y, Seok H, Oh JS, Moon HB, Choi K. Thyroid and sex hormone disrupting effects of DEHTP at different life stages of zebrafish (Danio rerio). CHEMOSPHERE 2024; 358:142105. [PMID: 38657690 DOI: 10.1016/j.chemosphere.2024.142105] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/21/2023] [Revised: 04/18/2024] [Accepted: 04/20/2024] [Indexed: 04/26/2024]
Abstract
Di(2-ethylhexyl) terephthalate (DEHTP) is an alternative plasticizer widely used in numerous consumer products, replacing di(2-ethylhexyl) phthalate (DEHP). Hence, DEHTP has been frequently detected in the environment and humans. As a structural isomer and functional analog of DEHP, DEHTP is a suspected endocrine disruptor. Here, we evaluated thyroid-disrupting effects of DEHTP using embryo-larval and adult male zebrafish. We also investigated its sex hormone disruption potential in the adult zebrafish. After 5- and 7-days of exposure to DEHTP, significant increases in whole-body thyroid hormonal levels were observed in the larval fish. Down-regulation of several thyroid-regulating genes, including trh, tshβ, nis, and dio2, was observed, but only after 5-day exposure. Following a 21-day exposure, the adult male zebrafish exhibited a significant decrease in total triiodothyronine and an increase in thyroid-stimulating hormones. Potential changes in the deiodination of thyroid hormones, supported by the up-regulation of two deiodinases, dio1 and dio3a, along with the down-regulation of dio2, could explain the thyroid hormone changes in the adult zebrafish. Moreover, significant trends of decrease in estradiol and 11-ketotestosterone, along with increase of testosterone (T), were observed in the adult zebrafish. Up-regulation of several steroidogenic genes may explain elevated T, while exact mechanisms of action warrant further investigation. Our results demonstrate that DEHTP can cause disruptions of thyroid and sex hormones at different life stages in zebrafish.
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Affiliation(s)
- Yunchul Ihn
- Graduate School of Public Health, Seoul National University, Seoul, Republic of Korea.
| | - Yoojin Cho
- Graduate School of Public Health, Seoul National University, Seoul, Republic of Korea.
| | - Yura Lee
- Graduate School of Public Health, Seoul National University, Seoul, Republic of Korea.
| | - Hyesun Seok
- Graduate School of Public Health, Seoul National University, Seoul, Republic of Korea.
| | - Jin-Su Oh
- Department of Marine Sciences and Convergence Engineering, College of Science and Convergence Technology, Hanyang University, Ansan, 15588, Republic of Korea.
| | - Hyo-Bang Moon
- Department of Marine Sciences and Convergence Engineering, College of Science and Convergence Technology, Hanyang University, Ansan, 15588, Republic of Korea.
| | - Kyungho Choi
- Graduate School of Public Health, Seoul National University, Seoul, Republic of Korea; Institute of Health and Environment, Seoul National University, Seoul, Republic of Korea.
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Wang W, Zhan Y, Gao D, Lu F, Peng L, Chen Y, Han J, Xue Z. Unveiling the hidden effects of hypoxia: Pituitary damage and hormonal imbalance in fat greenling (Hexagrammos otakii). THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 927:172381. [PMID: 38604374 DOI: 10.1016/j.scitotenv.2024.172381] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/09/2023] [Revised: 03/12/2024] [Accepted: 04/08/2024] [Indexed: 04/13/2024]
Abstract
BACKGROUND In fisheries, hypoxia stress is one of the most common environmental stresses that often lead to the death of large numbers of fish and cause significant economic losses. The pituitary, an important endocrine gland, lies below the hypothalamus region of the brain. It plays a crucial part in controlling vital physiological functions in fish, such as growth, reproduction, and responses to stress. However, the detailed mechanisms of how hypoxia affects these physiological processes via the pituitary remain largely unknown. METHODS Fat greenlings (Hexagrammous otakii) were exposed to different dissolved oxygen (DO = 7. 6 mg/L and DO = 2 mg/L) for 24 h. miRNA-mRNA association analysis of H. otakii pituitary after hypoxia stress. Detecting apoptosis in H. otakii pituitary using Tunel and qPCR. Subsequent detection of hormones in H. otakii liver, gonads and serum by ELISA. RESULTS In this study, hypoxia causes immune system disorders and inflammatory responses through the combined analysis of miRNAs and mRNAs. Subsequent verification indicated a significant accumulation of reactive oxygen species (ROS) subsequent to hypoxia treatment. The overproduction of ROS cause oxidative stress and apoptosis in the pituitary, ultimately causing pituitary damage and reduced growth hormone and luteinising hormone release. CONCLUSIONS According to the association study of miRNA-mRNA, apoptosis problems caused by hypoxia stress result in H. otakii pituitary damage. In the meantime, this work clarifies the possible impact of hypoxia-stress on the pituitary cells, as well as on the gonadal development and growth of H. otakii.
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Affiliation(s)
- Wei Wang
- Key Laboratory of Applied Biology and Aquaculture of Fish in Northern Liaoning Province, Dalian Ocean University, Dalian 116023, China; College of Fisheries and Life Science, Dalian Ocean University, Dalian 116023, China
| | - Yu Zhan
- Key Laboratory of Applied Biology and Aquaculture of Fish in Northern Liaoning Province, Dalian Ocean University, Dalian 116023, China; College of Fisheries and Life Science, Dalian Ocean University, Dalian 116023, China
| | - Dongxu Gao
- Key Laboratory of Applied Biology and Aquaculture of Fish in Northern Liaoning Province, Dalian Ocean University, Dalian 116023, China; College of Fisheries and Life Science, Dalian Ocean University, Dalian 116023, China
| | - Fengzhi Lu
- Key Laboratory of Applied Biology and Aquaculture of Fish in Northern Liaoning Province, Dalian Ocean University, Dalian 116023, China; College of Fisheries and Life Science, Dalian Ocean University, Dalian 116023, China
| | - Lei Peng
- Key Laboratory of Applied Biology and Aquaculture of Fish in Northern Liaoning Province, Dalian Ocean University, Dalian 116023, China; College of Fisheries and Life Science, Dalian Ocean University, Dalian 116023, China
| | - Yan Chen
- Key Laboratory of Applied Biology and Aquaculture of Fish in Northern Liaoning Province, Dalian Ocean University, Dalian 116023, China; College of Fisheries and Life Science, Dalian Ocean University, Dalian 116023, China
| | - Jian Han
- Key Laboratory of Applied Biology and Aquaculture of Fish in Northern Liaoning Province, Dalian Ocean University, Dalian 116023, China; College of Fisheries and Life Science, Dalian Ocean University, Dalian 116023, China.
| | - Zhuang Xue
- Key Laboratory of Applied Biology and Aquaculture of Fish in Northern Liaoning Province, Dalian Ocean University, Dalian 116023, China; College of Fisheries and Life Science, Dalian Ocean University, Dalian 116023, China.
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Zhao C, Song Y, Zhang G, Zhang K, Yin S, Ji J. Multi-omics analysis identifies sex-specific hepatic protein-metabolite networks in yellow catfish (Pelteobagrus fulvidraco) exposed to chronic hypoxia. Int J Biol Macromol 2024; 268:131892. [PMID: 38677698 DOI: 10.1016/j.ijbiomac.2024.131892] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2023] [Revised: 04/22/2024] [Accepted: 04/24/2024] [Indexed: 04/29/2024]
Abstract
Hypoxia disrupts the endocrine system of teleosts. The liver plays important roles in the endocrine system, energy storage, and metabolic processes. The aim of this study was to investigate the sex-specific hepatic response of yellow catfish under chronic hypoxia at the multi-omics level. Common hepatic responses in both sexes included the HIF-1 signaling pathway, glycolysis/gluconeogenesis, and steroid biosynthesis. Hypoxia dysregulated primary bile acid biosynthesis, lipid metabolism, and vitellogenin levels in female fish. Endoplasmic reticulum function in females also tended to be disrupted by hypoxia, as evidenced by significantly enriched pathways, including ribosome, protein processing in the endoplasmic reticulum, and RNA degradation. Other pathways, including the TCA cycle, oxidative phosphorylation, and Parkinson's and Huntington's disease, were highly enriched by hypoxia in male fish, suggesting that mitochondrial function was dysregulated. In both sexes of yellow catfish, the cell cycle was arrested and apoptosis was inhibited under chronic hypoxia. Multi-omics suggested that SLC2A5, CD209, LGMN, and NEDD8 served as sex-specific markers in these fish under chronic hypoxia. Our results provide insights into hepatic adaptation to chronic hypoxia and facilitate our understanding of sex-specific responses in fish.
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Affiliation(s)
- Cheng Zhao
- College of Marine Science and Engineering, College of Life Science, Nanjing Normal University, Nanjing, Jiangsu, China; Co-Innovation Center for Marine Bio-Industry Technology, Lian Yungang, Jiangsu, China
| | - Yufeng Song
- College of Marine Science and Engineering, College of Life Science, Nanjing Normal University, Nanjing, Jiangsu, China
| | - Guosong Zhang
- School of Agriculture and Bioengineering, Heze University, Heze, Shandong, China
| | - Kai Zhang
- College of Marine Science and Engineering, College of Life Science, Nanjing Normal University, Nanjing, Jiangsu, China; Co-Innovation Center for Marine Bio-Industry Technology, Lian Yungang, Jiangsu, China
| | - Shaowu Yin
- College of Marine Science and Engineering, College of Life Science, Nanjing Normal University, Nanjing, Jiangsu, China; Co-Innovation Center for Marine Bio-Industry Technology, Lian Yungang, Jiangsu, China.
| | - Jie Ji
- College of Marine Science and Engineering, College of Life Science, Nanjing Normal University, Nanjing, Jiangsu, China; Co-Innovation Center for Marine Bio-Industry Technology, Lian Yungang, Jiangsu, China.
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Zhao C, Yan J, Zhang Y, Zhang G, Wang T, Zhang K, Yin S. Effect of long-term hypoxia on the reproductive systems of female and male yellow catfish (Pelteobagrus fulvidraco). Comp Biochem Physiol B Biochem Mol Biol 2023; 267:110864. [PMID: 37187433 DOI: 10.1016/j.cbpb.2023.110864] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2023] [Revised: 05/09/2023] [Accepted: 05/09/2023] [Indexed: 05/17/2023]
Abstract
This study investigated the effects of different levels of hypoxia on the reproductive system of yellow catfish. Yellow catfish (Pelteobagrus fulvidraco) were exposed to three dissolved oxygen concentration levels: normoxia (6.5 ± 0.2 mg/L), moderate hypoxia (MH, 3.8 ± 0.3 mg/L) and severe hypoxia (SH, 1.9 ± 0.2 mg/L) for 30 days. The gonadosomatic index of males, not females, significantly decreased in the SH group. In the SH group, for the females, the ratio of vitellogenic follicles significantly decreased, whereas the number of atretic follicles significantly increased. In male fish, a significantly reduced number of spermatozoa was observed in both the MH and SH groups. Elevated apoptosis levels in the testes and ovaries were observed only in the SH group. Serum 17β-estradiol and vitellogenin levels in females and testosterone levels in males significantly decreased in the SH group. The concentration of 11-ketotestosterone in males significantly decreased in both the MH and SH groups. In female fish, dysregulated expression of the hypothalamic-pituitary-gonadal (HPG) axis, steroidogenesis genes, and hepatic genes related to vitellogenesis were observed only in the SH group. However, in male fish, moderate hypoxia altered the expression of HPG genes, including gnrh1, lhcgr, and amh. Moreover, the MH group significantly altered the expression of steroidogenesis genes like star, 17β-hsd, and cyp17a1. The results of this study suggest that severe hypoxia can cause reproductive defects in female and male yellow catfish. Moreover, the reproductive system of male yellow catfish is more sensitive to moderate hypoxia than that of female catfish. Our findings contribute to our understanding of the response of the teleost reproductive system to long-term hypoxia.
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Affiliation(s)
- Cheng Zhao
- College of Life Science, College of Marine Science and Engineering, Nanjing Normal University, Nanjing, Jiangsu, China; Co-Innovation Center for Marine Bio-Industry Technology, Lian Yungang, China
| | - Jie Yan
- College of Life Science, College of Marine Science and Engineering, Nanjing Normal University, Nanjing, Jiangsu, China
| | - Yufei Zhang
- College of Life Science, College of Marine Science and Engineering, Nanjing Normal University, Nanjing, Jiangsu, China
| | - Guosong Zhang
- School of Agriculture and Bioengineering, Heze University, Heze, Shandong, China
| | - Tao Wang
- College of Life Science, College of Marine Science and Engineering, Nanjing Normal University, Nanjing, Jiangsu, China; Co-Innovation Center for Marine Bio-Industry Technology, Lian Yungang, China
| | - Kai Zhang
- College of Life Science, College of Marine Science and Engineering, Nanjing Normal University, Nanjing, Jiangsu, China; Co-Innovation Center for Marine Bio-Industry Technology, Lian Yungang, China.
| | - Shaowu Yin
- College of Life Science, College of Marine Science and Engineering, Nanjing Normal University, Nanjing, Jiangsu, China; Co-Innovation Center for Marine Bio-Industry Technology, Lian Yungang, China.
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Rahman MS, Thomas P. Molecular Characterization and Expression of Cytochrome P450 Aromatase in Atlantic Croaker Brain: Regulation by Antioxidant Status and Nitric Oxide Synthase During Hypoxia Stress. Front Physiol 2021; 12:720200. [PMID: 34434121 PMCID: PMC8381199 DOI: 10.3389/fphys.2021.720200] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2021] [Accepted: 07/08/2021] [Indexed: 11/13/2022] Open
Abstract
We have previously shown that nitric oxide synthase (NOS, an enzyme) is significantly increased during hypoxic stress in Atlantic croaker brains and modulated by an antioxidant (AOX). However, the influence of NOS and AOX on cytochrome P450 aromatase (AROM, CYP19a1, an enzyme) activity on vertebrate brains during hypoxic stress is largely unknown. In this study, we characterized brain AROM (bAROM, CYP19a1b) cDNA in croaker and examined the interactive effects of hypoxia and a NOS-inhibitor or AOX on AROM activity. The amino acid sequence of croaker bAROM cDNA is highly homologous (76–80%) to other marine teleost bAROM cDNAs. Both real-time PCR and Northern blot analyses showed that bAROM transcript (size: ∼2.8 kb) is highly expressed in the preoptic-anterior hypothalamus (POAH). Hypoxia exposure (dissolved oxygen, DO: 1.7 mg/L for 4 weeks) caused significant decreases in hypothalamic AROM activity, bAROM mRNA and protein expressions. Hypothalamic AROM activity and mRNA levels were also decreased by pharmacological treatment with N-ethylmaleimide (NEM, an alkylating drug that modifies sulfhydryl groups) of fish exposed to normoxic (DO: ∼6.5 mg/L) conditions. On the other hand, treatments with Nω-nitro-L-arginine methyl ester (NAME, a competitive NOS-inhibitor) or vitamin-E (Vit-E, a powerful AOX) prevented the downregulation of hypothalamic AROM activity and mRNA levels in hypoxic fish. Moreover, NAME and Vit-E treatments also restored gonadal growth in hypoxic fish. Double-labeled immunohistochemistry results showed that AROM and NOS proteins are co-expressed with NADPH oxidase (generates superoxide anion) in the POAH. Collectively, these results suggest that the hypoxia-induced downregulation of AROM activity in teleost brains is influenced by neuronal NOS activity and AOX status. The present study provides, to the best of our knowledge, the first evidence of restoration of AROM levels in vertebrate brains by a competitive NOS-inhibitor and potent AOX during hypoxic stress.
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Affiliation(s)
- Md Saydur Rahman
- School of Earth, Environmental and Marine Sciences, University of Texas Rio Grande Valley, Brownsville, TX, United States.,Marine Science Institute, University of Texas at Austin, Port Aransas, TX, United States
| | - Peter Thomas
- Marine Science Institute, University of Texas at Austin, Port Aransas, TX, United States
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Luu I, Ikert H, Craig PM. Chronic exposure to anthropogenic and climate related stressors alters transcriptional responses in the liver of zebrafish (Danio rerio) across multiple generations. Comp Biochem Physiol C Toxicol Pharmacol 2021; 240:108918. [PMID: 33141083 DOI: 10.1016/j.cbpc.2020.108918] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/16/2020] [Revised: 10/09/2020] [Accepted: 10/18/2020] [Indexed: 01/04/2023]
Abstract
The antidepressant, venlafaxine (VFX), and climate change stressors, such as increased water temperature and decreased dissolved oxygen, are current threats to aquatic environments. This study aimed to determine how microRNAs (miRNAs) and predicted targeted transcripts were altered in livers of zebrafish exposed to these stressors, and livers of their un-exposed F1 and F2 offspring. Following a 21 day exposure to multiple stressors (1 μg/L VFX, +5 °C ambient, 50% O2), then a subsequent 21 day recovery, relative abundances of cyp3a65, hsp70, hsp90, and ppargc1a and miRNAs predicted to target them (miR-142a, miR-16c, miR-181c, and miR-129, respectively) were measured in the liver via quantitative PCR (RT-qPCR). There were significant decreases in miR-142a in the exposed F0 generation and the exposed F1 generation. While there were no changes detected in cyp3a65 relative abundance, there was a significant inverse relationship between cyp3a65 and miR-142a. Hsp70 expression significantly increased in the F1 generation, which persisted to the F2 generation and the relative abundance of hsp90 significantly increased in all generations. There was a significant reduction in miR-181c in the F1 generation, but there was no significant relationship between miR-181c and hsp90. Finally, there was a significant decrease in ppargc1a relative abundance in the F1 generation which was associated with an increase in miR-129. Combined, these results suggest that parental exposure to multiple, environmentally relevant stressors can confer transcriptional and epigenetic responses in the F1 and F2 generations, although identifying which stressor is a driving force becomes unclear.
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Affiliation(s)
- Ivy Luu
- Department of Biology, University of Waterloo, 200 University Ave. W., Waterloo N2L 3G1, Ontario, Canada
| | - Heather Ikert
- Department of Biology, University of Waterloo, 200 University Ave. W., Waterloo N2L 3G1, Ontario, Canada.
| | - Paul M Craig
- Department of Biology, University of Waterloo, 200 University Ave. W., Waterloo N2L 3G1, Ontario, Canada
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Sun S, Chen Y, Hu R. Aquatic hypoxia disturbs oriental river prawn (Macrobrachium nipponense) testicular development: A cross-generational study. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2020; 266:115093. [PMID: 32622004 DOI: 10.1016/j.envpol.2020.115093] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/06/2020] [Revised: 05/29/2020] [Accepted: 06/22/2020] [Indexed: 06/11/2023]
Abstract
Recently, we reported that hypoxia disrupts the endocrine system and causes metabolic abnormalities in prawns. Although transgenerational impairment effects of hypoxia have become a hot topic in vertebrate, it is unknown whether hypoxia could exert cross-generational effects on testicular function crustaceans. The present study aimed to investigate hypoxia's toxic effects on the testicular function of oriental river prawns (Macrobrachium nipponense) and offspring development. Hypoxia disrupted testicular germ cells quality, caused sex hormone imbalance (testosterone and estradiol), and delayed testicular development. The F1 generation derived from male prawns exposed to hypoxia showed retarded embryonic development, and reduced hatching success and larval development, despite not being exposed to hypoxia. Analysis of the transcriptome the F0 generation (exposed to hypoxia) showed that the impaired testicular functions were associated with changes to mitochondrial oxidative phosphorylation, apoptosis, and steroid biosynthesis. Interestingly, quantitative real-time PCR confirmed that hypoxia could significantly suppress the expression of antioxidant and gonad development-related genes in the testis of the F1 generations, with and without continued hypoxia exposures. In addition, paternal exposure to hypoxia could result in a higher production of reactive oxygen species in offspring testis tissue compared with those without hypoxia exposure. The cross-generational effects of testicular function implied that the sustainability of natural freshwater prawn populations would be threatened by chronic hypoxia.
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Affiliation(s)
- Shengming Sun
- Key Laboratory of Exploration and Utilization of Aquatic Genetic Resources, Ministry of Education, Shanghai Ocean University, Shanghai, 201306, China; International Research Center for Marine Biosciences at Shanghai Ocean University, Ministry of Science and Technology, China; National Demonstration Center for Experimental Fisheries Science Education, Shanghai Ocean University, Shanghai, China.
| | - Yinxiang Chen
- Key Laboratory of Exploration and Utilization of Aquatic Genetic Resources, Ministry of Education, Shanghai Ocean University, Shanghai, 201306, China
| | - Ran Hu
- Key Laboratory of Exploration and Utilization of Aquatic Genetic Resources, Ministry of Education, Shanghai Ocean University, Shanghai, 201306, China
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Ma YN, Sun LH, Li SY, Ni YX, Cao ZY, Chen MX, Mou RX. Modulation of steroid metabolism and xenobiotic biotransformation responses in zebrafish (Danio rerio) exposed to triadimefon. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2020; 262:114145. [PMID: 32142974 DOI: 10.1016/j.envpol.2020.114145] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/08/2019] [Revised: 01/17/2020] [Accepted: 02/06/2020] [Indexed: 06/10/2023]
Abstract
The widely used fungicide triadimefon (TDF) has been detected in aquatic environments, and appears to disrupt steroid homeostasis; however, the toxic effects on fish reproduction triggered by TDF via the key receptor signaling pathways remain largely unknown. The present study showed that TDF (0.069, 0.138, 0.690 mg/L) exposure not only caused disordered germ cell maturation, but also decreased spawned egg production. In order to better understand this reproductive inhibition, we investigated the effects of TDF based on quantitative PCR, Western blot and mass spectrometry methodology in zebrafish. Due to the preferential accumulation of TDF in the liver, a general pattern of up-regulation of genes involved in biotransformation pathway was observed. A significant increase in abcb4 expression appeared to be responsible for TDF excretion. TDF-induced receptors (AhR2 and PXR) changed many genes involved in steroid metabolism, and subsequent disruptions in steroid homeostasis, which might be the key biological pathway in TDF reproductive toxicity. However, due to the different metabolic demands, the transcript profiles involved in steroid metabolism in zebrafish exhibited a sex-specific expression pattern. For example, the increase in gene expression of ahr2 was accompanied by a reduction in the rate of E2 biosynthesis resulting from the diminished cyp19a1a expression, and in turn led to down-regulation of esr1 and vtg1 in the liver, supporting the anti-estrogenic effect of TDF in male fish. In contrast, the increase in E2 production was accompanied by an increase in Esr1 protein expression caused by TDF and paralleled the increase in ahrr1 expression, suggesting that TDF may induce estrogenic activity through AhR-ER interactions in females. In addition, over-induction of cyp3a65 activity mediated through pxr, which helped to accelerate the transformation from TDF to triadimenol in the liver, appeared to elevate T metabolite rate in females. The down-regulation of fshβ transcript in males further suggested that TDF might adversely affect normal gametogenesis and induce reproductive toxicity.
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Affiliation(s)
- You-Ning Ma
- China National Rice Research Institute, Hangzhou, 310006, PR China
| | - Li-Hua Sun
- Institute of Health Food, Zhejiang Academy of Medical Science, Hangzhou, 310013, PR China
| | - Shu-Ying Li
- Institute of Pesticide and Environmental Toxicology, Zhejiang University, Hangzhou, 310029, PR China
| | - Yan-Xia Ni
- China National Rice Research Institute, Hangzhou, 310006, PR China
| | - Zhao-Yun Cao
- China National Rice Research Institute, Hangzhou, 310006, PR China
| | - Ming-Xue Chen
- China National Rice Research Institute, Hangzhou, 310006, PR China
| | - Ren-Xiang Mou
- China National Rice Research Institute, Hangzhou, 310006, PR China.
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11
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Lai KP, Tam N, Wang SY, Lin X, Chan TF, Au DWT, Wu RSS, Kong RYC. Hypoxia causes sex-specific hepatic toxicity at the transcriptome level in marine medaka (Oryzias melastigma). AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2020; 224:105520. [PMID: 32480175 DOI: 10.1016/j.aquatox.2020.105520] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/21/2019] [Revised: 05/03/2020] [Accepted: 05/13/2020] [Indexed: 06/11/2023]
Abstract
Hypoxia, a low environmental oxygen level, is a common problem in the ocean globally. Hypoxia has been known to cause disruption to the endocrine system of marine organisms in both laboratory and field studies. Our previous studies have demonstrated the sex-specific response to hypoxia in the neural and reproductive systems of marine fish. In the current report, we aim to study the sex-specific hepatic response of fish at the transcriptome level to hypoxic stress. By using a comparative transcriptome analysis, followed by a systematic bioinformatics analysis including Database for Annotation, Visualization and Integrated Discovery (DAVID) and Ingenuity Pathway Analysis (IPA), we found that hypoxia altered expression of genes related to cell proliferation and apoptosis of hepatocytes, which are associated with human pathologies, such as liver inflammation hepatic steatosis and steatohepatitis. Furthermore, we observed sex-specific responses in the livers of fish through different cell signaling pathways. In female fish, hypoxia causes dysregulation of expression of genes related to impairment in endoplasmic reticulum structure and liver metabolism. In male fish, genes associated with redox homeostasis and fatty acid metabolism were altered by hypoxic stress. The findings of this study support the notion that hypoxia could cause sex-specific changes (hepatic toxicity and changes) in marine fish.
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Affiliation(s)
- Keng Po Lai
- Guangxi Key Laboratory of Tumor Immunology and Microenvironmental Regulation, Guilin Medical University, Guilin, PR China; Guangxi Key Laboratory of Beibu Gulf Marine Biodiversity Conservation, Beibu Gulf University, Qinzhou, PR China; Department of Chemistry, City University of Hong Kong, Hong Kong, PR China; State Key Laboratory of Marine Pollution, City University of Hong Kong, Hong Kong, PR China.
| | - Nathan Tam
- Department of Chemistry, City University of Hong Kong, Hong Kong, PR China
| | - Simon Yuan Wang
- Division of Newborn Medicine, Children's Hospital Boston, 300 Longwood Avenue, Boston, Massachusetts, 02115, United States; Department of Pediatrics, Harvard Medical School, Boston, Massachusetts, 02115, United States
| | - Xiao Lin
- School of Life Sciences, Hong Kong Bioinformatics Centre, The Chinese University of Hong Kong, Hong Kong, PR China
| | - Ting Fung Chan
- School of Life Sciences, Hong Kong Bioinformatics Centre, The Chinese University of Hong Kong, Hong Kong, PR China
| | - Doris Wai Ting Au
- Department of Chemistry, City University of Hong Kong, Hong Kong, PR China; State Key Laboratory of Marine Pollution, City University of Hong Kong, Hong Kong, PR China
| | - Rudolf Shiu Sun Wu
- State Key Laboratory of Marine Pollution, City University of Hong Kong, Hong Kong, PR China; Department of Science and Environmental Studies, The Education University of Hong Kong, Hong Kong, PR China
| | - Richard Yuen Chong Kong
- Department of Chemistry, City University of Hong Kong, Hong Kong, PR China; State Key Laboratory of Marine Pollution, City University of Hong Kong, Hong Kong, PR China.
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12
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Servili A, Canario AVM, Mouchel O, Muñoz-Cueto JA. Climate change impacts on fish reproduction are mediated at multiple levels of the brain-pituitary-gonad axis. Gen Comp Endocrinol 2020; 291:113439. [PMID: 32061640 DOI: 10.1016/j.ygcen.2020.113439] [Citation(s) in RCA: 39] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/05/2019] [Revised: 02/11/2020] [Accepted: 02/11/2020] [Indexed: 11/30/2022]
Abstract
Anthropogenic emissions of carbon dioxide in the atmosphere have generated rapid variations in atmospheric composition which drives major climate changes. Climate change related effects include changes in physico-chemical proprieties of sea and freshwater, such as variations in water temperature, salinity, pH/pCO2 and oxygen content, which can impact fish critical physiological functions including reproduction. In this context, the main aim of the present review is to discuss how climate change related effects (variation in water temperature and salinity, increases in duration and frequency of hypoxia events, water acidification) would impact reproduction by affecting the neuroendocrine axis (brain-pituitary-gonad axis). Variations in temperature and photoperiod regimes are known to strongly affect sex differentiation and the timing and phenology of spawning period in several fish species. Temperature mainly acts at the level of gonad by interfering with steroidogenesis, (notably on gonadal aromatase activity) and gametogenesis. Temperature is also directly involved in the quality of released gametes and embryos development. Changes in salinity or water acidification are especially associated with reduction of sperm quality and reproductive output. Hypoxia events are able to interact with gonad steroidogenesis by acting on the steroids precursor cholesterol availability or directly on aromatase action, with an impact on the quality of gametes and reproductive success. Climate change related effects on water parameters likely influence also the reproductive behavior of fish. Although the precise mechanisms underlying the regulation of these effects are not always understood, in this review we discuss different hypothesis and propose future research perspectives.
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Affiliation(s)
- Arianna Servili
- Ifremer, Univ Brest, CNRS, IRD, LEMAR, F-29280 Plouzane, France.
| | - Adelino V M Canario
- Comparative Endocrinology and Integrative Biology, Centre of Marine Sciences, Universidade do Algarve, Campus de Gambelas, 8005-139 Faro, Portugal
| | - Olivier Mouchel
- Ifremer, Univ Brest, CNRS, IRD, LEMAR, F-29280 Plouzane, France
| | - José Antonio Muñoz-Cueto
- Faculty of Marine and Environmental Sciences, INMAR, Department of Biology, University of Cádiz, Marine Campus of International Excellence (CEIMAR), Agrifood Campus of International Excellence (ceiA3) and European University of the Seas (SEA-EU), E11510 Puerto Real, Spain
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13
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Tang L, Liu M, Song S, Hu C, Lam PKS, Lam JCW, Chen L. Interaction between hypoxia and perfluorobutane sulfonate on developmental toxicity and endocrine disruption in marine medaka embryos. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2020; 222:105466. [PMID: 32172180 DOI: 10.1016/j.aquatox.2020.105466] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/17/2020] [Revised: 02/22/2020] [Accepted: 03/07/2020] [Indexed: 06/10/2023]
Abstract
The co-occurrence of hypoxia and xenobiotics is extremely common in natural environments, highlighting the necessity to elicit their interaction on aquatic toxicities. In the present study, marine medaka embryos were exposed to various concentrations (nominal 0, 1, 3.3 and 10 mg/L) of perfluorobutane sulfonate (PFBS), an environmental pollutant of emerging concern, under either normoxia (6.9 mg/L) or hypoxia (1.7 mg/L) condition. After acute exposure till 15 days post-fertilization, single or combined toxicities of PFBS and hypoxia on embryonic development (e.g., mortality, hatching and heartbeat) and endocrine systems were investigated. Sex and thyroid hormones were measured by enzyme-linked immunosorbent assay. Transcriptional changes of endocrine genes were determined by quantitative real-time PCR assays. Co-exposure to 10 mg/L PFBS and hypoxia caused a further reduction in survival rate and heart beat compared to single exposure. PFBS induced a precocious hatching, while no larvae hatched under hypoxia condition. By disturbing the balance of sex hormones, either PFBS or hypoxia single exposure produced an anti-estrogenic activity in medaka larvae. However, PFBS and hypoxia combinations reversed to estrogenic activity in co-exposed larvae. Variation in disrupting pattern may be attributed to the interactive effects on steroidogenic pathway involving diverse cytochrome P450 enzymes. Regarding thyroid system, PFBS exposure caused detriments of multiple processes along thyroidal axis (e.g., feedback regulation, synthesis and transport of thyroid hormones, receptor-mediated signaling and thyroid gland development), while hypoxia potently impaired the development and function of thyroid gland. Combinations of PFBS and hypoxia interacted to dysregulate the function of thyroid endocrine system. In summary, the present study revealed the dynamic interaction of PFBS pollutant and hypoxia on aquatic developmental toxicities and endocrine disruption. Considering the frequent co-occurrence of xenobiotics and hypoxia, current results would be beneficial to improve our understanding about their interactive mechanisms and provide baseline evidences for accurate ecological risk evaluation.
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Affiliation(s)
- Lizhu Tang
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, 430072, China; University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Mengyuan Liu
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, 430072, China; University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Shiwen Song
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, 430072, China
| | - Chenyan Hu
- School of Chemistry and Environmental Engineering, Wuhan Institute of Technology, Wuhan, 430072, China
| | - Paul K S Lam
- State Key Laboratory of Marine Pollution and Department of Chemistry, City University of Hong Kong, Kowloon, Hong Kong Special Administrative Region
| | - James C W Lam
- Department of Science and Environmental Studies, The Education University of Hong Kong, Hong Kong Special Administrative Region
| | - Lianguo Chen
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, 430072, China.
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14
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Irob K, Wagler M, Baberschke N, Meinelt T, Kloas W. Potash mining effluents induce moderate effects on histopathological and physiological endpoints of adult zebrafish (Danio rerio). THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 694:133471. [PMID: 31400679 DOI: 10.1016/j.scitotenv.2019.07.277] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/17/2019] [Revised: 07/12/2019] [Accepted: 07/17/2019] [Indexed: 06/10/2023]
Abstract
Stress in fish can be caused by a variety of factors and has the potential to evoke stress responses leading to a reduction of physical condition and of health. The river Werra (Germany) presents a severe case of secondary salinisation caused by potash mining activities. The model organism Danio rerio was exposed to different ion-concentrations depicting current (HT) and future (LT) threshold values of the Werra, as well as to solutions with single-exceeding ions (Mg2+ + K+ (KMg), Mg2+ (Mg) and K+ (K)). After a six-week exposure period, cortisol levels, growth and weight were measured, gills and gonads were histologically analysed and mRNA expression of follicle stimulating hormone (FSH), luteinising hormone (LH), growth hormone (GH) and prolactin (PRL) were determined. Cortisol was still elevated in fish in the HT and K group, indicating moderate stress. However, gills revealed structural changes in zebrafish in all exposure groups, size of oocytes differed in the LT and K group, male FSH mRNA levels were elevated in the HT and LT group whereas PRL mRNA levels were lower in HT and LT for both, male and female fish. These results suggest that ion-stress induces moderate effects on a variety of biological parameters that mainly serve to adapt to elevated ion concentrations. For these reasons current and even future thresholds should be reconsidered, including thresholds for total as well as single ion concentrations. Future research looking at the effects on local fish species is needed, along with regular and long-term monitoring of environmental conditions, species abundance and diversity.
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Affiliation(s)
- Katja Irob
- Department of Ecophysiology and Aquaculture, Leibniz Institute of Freshwater Ecology and Inland Fisheries, Müggelseedamm 310, Berlin 12587, Germany; Biodiversity and Theoretical Ecology, Institute of Biology, Freie Universität Berlin, Altensteinstr. 34, Berlin 14195, Germany.
| | - Marit Wagler
- Department of Ecophysiology and Aquaculture, Leibniz Institute of Freshwater Ecology and Inland Fisheries, Müggelseedamm 310, Berlin 12587, Germany
| | - Nora Baberschke
- Department of Ecophysiology and Aquaculture, Leibniz Institute of Freshwater Ecology and Inland Fisheries, Müggelseedamm 310, Berlin 12587, Germany
| | - Thomas Meinelt
- Department of Ecophysiology and Aquaculture, Leibniz Institute of Freshwater Ecology and Inland Fisheries, Müggelseedamm 310, Berlin 12587, Germany
| | - Werner Kloas
- Department of Ecophysiology and Aquaculture, Leibniz Institute of Freshwater Ecology and Inland Fisheries, Müggelseedamm 310, Berlin 12587, Germany; Department of Endocrinology, Institute of Biology and Albrecht Daniel Thaer-Institute, Faculty of Life Sciences, Humboldt Universität zu Berlin, Invalidenstr. 42, Berlin 10115, Germany
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15
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Effects of hypoxia exposure on apoptosis and expression of membrane steroid receptors, ZIP9, mPRα, and GPER in Atlantic croaker ovaries. Comp Biochem Physiol A Mol Integr Physiol 2018; 224:84-92. [DOI: 10.1016/j.cbpa.2018.07.002] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2018] [Revised: 07/03/2018] [Accepted: 07/03/2018] [Indexed: 11/17/2022]
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16
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Marjan P, Van Der Kraak GJ, MacLatchy DL, Fuzzen MLM, Bragg LM, McMaster ME, Tetreault GR, Servos MR. Assessing recovery of in vitro steroid production in male rainbow darter (Etheostoma caeruleum) in response to municipal wastewater treatment plant infrastructure changes. ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY 2018; 37:501-514. [PMID: 28906017 DOI: 10.1002/etc.3986] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/12/2017] [Revised: 08/20/2017] [Accepted: 09/10/2017] [Indexed: 06/07/2023]
Abstract
The present study examined in vitro 11-ketotestosterone and testosterone production by the testes of rainbow darter (Etheostoma caeruleum) collected from selected reference sites and downstream of 2 municipal wastewater treatment plants (MWWTPs; Waterloo and Kitchener) on the central Grand River (Ontario, Canada), over a 6-yr period (2011-2016). The main objective was to investigate if infrastructure upgrades at the Kitchener MWWTP in 2012 resulted in a recovery of this response in the post-upgrade period (2013-2016). Two supporting studies showed that the fall season is appropriate for measuring in vitro sex steroid production because it provides stable detection of steroid patterns, and that the sample handling practiced in the present study did not introduce a bias. Infrastructure upgrades of the Kitchener MWWTP resulted in significant reductions in ammonia and estrogenicity. After the upgrades, 11-ketotestosterone production by MWWTP-exposed fish increased in 2013 and it continued to recover throughout the study period of 2014 through 2016, returning to levels measured in reference fish. Testosterone production was less sensitive and it lacked consistency. The Waterloo MWWTP underwent some minor upgrades but the level of ammonia and estrogenicity remained variable over time. The production of 11-ketotestosterone and testosterone in rainbow darter below the Waterloo MWWTP was variable and without a clear recovery pattern over the course of the present study. The results of the present study demonstrated that measuring production of sex steroids (especially 11-ketotestosterone) over multiple years can be relevant for assessing responses in fish to environmental changes such as those resulting from major infrastructure upgrades. Environ Toxicol Chem 2018;37:501-514. © 2017 SETAC.
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Affiliation(s)
- Patricija Marjan
- Department of Biology, University of Waterloo, Waterloo, Ontario, Canada
| | - Glen J Van Der Kraak
- Department of Integrative Biology, University of Guelph, Guelph, Ontario, Canada
| | - Deborah L MacLatchy
- Department of Biology and Canadian Rivers Institute, Wilfrid Laurier University, Waterloo, Ontario, Canada
| | - Meghan L M Fuzzen
- Department of Biology, McMaster University, Hamilton, Ontario, Canada
| | - Leslie M Bragg
- Department of Biology, University of Waterloo, Waterloo, Ontario, Canada
| | - Mark E McMaster
- Environment and Climate Change Canada, Canada Center Inland Waters, National Water Research Institute, Aquatic Contaminant Research Division, Burlington, Ontario, Canada
| | - Gerald R Tetreault
- Environment and Climate Change Canada, Canada Center Inland Waters, National Water Research Institute, Aquatic Contaminant Research Division, Burlington, Ontario, Canada
| | - Mark R Servos
- Department of Biology, University of Waterloo, Waterloo, Ontario, Canada
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17
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Lai KP, Li JW, Wang SY, Wan MT, Chan TF, Lui WY, Au DWT, Wu RSS, Kong RYC. Transcriptomic analysis reveals transgenerational effect of hypoxia on the neural control of testicular functions. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2018; 195:41-48. [PMID: 29276994 DOI: 10.1016/j.aquatox.2017.12.005] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/18/2017] [Revised: 12/12/2017] [Accepted: 12/14/2017] [Indexed: 06/07/2023]
Abstract
There are over 400 hypoxic zones in the ocean worldwide. Both laboratory and field studies have shown that hypoxia causes endocrine disruption and reproductive impairments in vertebrates. More importantly, our recent study discovered that parental (F0) hypoxia exposure resulted in the transgenerational impairment of sperm quality in the F2 generation through the epigenetic regulation of germ cells. In the present study, we aim to test the hypothesis that the brain, as the major regulator of the brain-pituitary-gonad (BPG) axis, is also involved in the observed transgenerational effect. Using comparative transcriptomic analysis on brain tissues of marine medaka Oryzias melastigma, 45 common differentially expressed genes caused by parental hypoxia exposure were found in the hypoxic group of the F0 and F2 generations, and the transgenerational groups of the F2 generation. The bioinformatic analysis on this deregulated gene cluster further highlighted the possible involvement of the brain in the transgenerational effect of hypoxia on testicular structure, including abnormal morphologies of the epididymis and the seminal vesicle, and degeneration of the seminiferous tubule. This finding is concordant to the result of hematoxylin and eosin staining, which showed the reduction of testicular lobular diameter in the F0 and F2 generations. Our study demonstrated for the first time the involvement of the brain in the transgenerational effect of hypoxia.
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Affiliation(s)
- Keng Po Lai
- Department of Chemistry, The City University of Hong Kong, Hong Kong Special Administrative Region; State Key Laboratory in Marine Pollution, The City University of Hong Kong, Hong Kong Special Administrative Region.
| | - Jing Woei Li
- Department of Chemistry, The City University of Hong Kong, Hong Kong Special Administrative Region; School of Life Sciences, The Chinese University of Hong Kong, Hong Kong Special Administrative Region.
| | - Simon Yuan Wang
- School of Biological Sciences, The University of Hong Kong, Hong Kong Special Administrative Region.
| | - Miles Teng Wan
- Department of Chemistry, The City University of Hong Kong, Hong Kong Special Administrative Region.
| | - Ting Fung Chan
- School of Life Sciences, The Chinese University of Hong Kong, Hong Kong Special Administrative Region; State Key Laboratory of Agrobiotechnology, The Chinese University of Hong Kong, Hong Kong Special Administrative Region.
| | - Wing Yee Lui
- School of Biological Sciences, The University of Hong Kong, Hong Kong Special Administrative Region
| | - Doris Wai-Ting Au
- Department of Chemistry, The City University of Hong Kong, Hong Kong Special Administrative Region; State Key Laboratory in Marine Pollution, The City University of Hong Kong, Hong Kong Special Administrative Region.
| | - Rudolf Shiu-Sun Wu
- State Key Laboratory in Marine Pollution, The City University of Hong Kong, Hong Kong Special Administrative Region; Department of Science and Environmental Studies, The Education University of Hong Kong, Hong Kong Special Administrative Region.
| | - Richard Yuen-Chong Kong
- Department of Chemistry, The City University of Hong Kong, Hong Kong Special Administrative Region; State Key Laboratory in Marine Pollution, The City University of Hong Kong, Hong Kong Special Administrative Region.
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18
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Zhao F, Wei P, Wang J, Yu M, Zhang X, Tian H, Wang W, Ru S. Estrogenic effects associated with bisphenol a exposure in male zebrafish (Danio rerio) is associated with changes of endogenous 17β-estradiol and gene specific DNA methylation levels. Gen Comp Endocrinol 2017; 252:27-35. [PMID: 28765074 DOI: 10.1016/j.ygcen.2017.07.032] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/06/2016] [Revised: 07/13/2017] [Accepted: 07/28/2017] [Indexed: 10/19/2022]
Abstract
The binding affinity of bisphenol A (BPA) to estrogen receptors (ERs) is much lower than that of 17β-estradiol (E2), and whether there are other molecular mechanisms responsible for the estrogenic action of BPA in vivo currently remains unknown. The objective of this study was to explore the potential association between the estrogenic effect induced by bisphenol A in vivo and changes of endogenous E2 and gene specific DNA methylation levels. After a waterborne exposure of male zebrafish to 500, 1000, or 1500μg/L of BPA for 21d, vitellogenin (VTG) concentration in whole body homogenate, plasma E2 and testosterone levels, hepatic ERs mRNA expressions, gonadal cyp19a1a and cyp17a1 mRNA expressions, and methylation levels of hepatic esr1 and gonadal cyp19a1a's promoters were determined. Our results indicated that for the 500 and 1500μg/L treatment groups, VTG might be induced mainly by the elevated E2 levels; increases of E2 levels could be partly explained by the up-regulated expression of gonadal aromatase, mRNA levels of which were found to be negatively related to the methylation levels of both its promoter and one CpG site. In addition, upon BPA exposure, hepatic esr1 mRNA levels were also negatively related to the methylation levels of both its promoter and one CpG site. These observations provide evidence for the non-ERs mediated mechanisms underlying the estrogenic action of BPA on male zebrafish.
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Affiliation(s)
- Fei Zhao
- Marine Life Science College, Ocean University of China, 5 Yushan Road, Qingdao, Shandong province 266003, PR China
| | - Penghao Wei
- Marine Life Science College, Ocean University of China, 5 Yushan Road, Qingdao, Shandong province 266003, PR China
| | - Jun Wang
- Marine Life Science College, Ocean University of China, 5 Yushan Road, Qingdao, Shandong province 266003, PR China
| | - Miao Yu
- Marine Life Science College, Ocean University of China, 5 Yushan Road, Qingdao, Shandong province 266003, PR China
| | - Xiaona Zhang
- Marine Life Science College, Ocean University of China, 5 Yushan Road, Qingdao, Shandong province 266003, PR China
| | - Hua Tian
- Marine Life Science College, Ocean University of China, 5 Yushan Road, Qingdao, Shandong province 266003, PR China
| | - Wei Wang
- Marine Life Science College, Ocean University of China, 5 Yushan Road, Qingdao, Shandong province 266003, PR China
| | - Shaoguo Ru
- Marine Life Science College, Ocean University of China, 5 Yushan Road, Qingdao, Shandong province 266003, PR China.
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19
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Tan T, Yu RMK, Wu RSS, Kong RYC. Overexpression and Knockdown of Hypoxia-Inducible Factor 1 Disrupt the Expression of Steroidogenic Enzyme Genes and Early Embryonic Development in Zebrafish. GENE REGULATION AND SYSTEMS BIOLOGY 2017. [PMID: 28634424 PMCID: PMC5467919 DOI: 10.1177/1177625017713193] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
Hypoxia is an important environmental stressor leading to endocrine disruption and reproductive impairment in fish. Although the hypoxia-inducible factor 1 (HIF-1) is known to regulate the transcription of various genes mediating oxygen homeostasis, its role in modulating steroidogenesis-related gene expression remains poorly understood. In this study, the regulatory effect of HIF-1 on the expression of 9 steroidogenic enzyme genes was investigated in zebrafish embryos using a “gain-of-function and loss-of-function” approach. Eight of the genes, CYP11a, CYP11b2, 3β-HSD, HMGCR, CYP17a1, 17β-HSD2, CYP19a, and CYP19b, were found to be differentially upregulated at 24 and 48 hpf following zHIF-1α-ΔODD overexpression (a mutant zebrafish HIF-1α protein with proline-414 and proline-557 deleted). Knockdown of zHIF-1α also affected the expression pattern of the steroidogenic enzyme genes. Overexpression of zHIF-1α and hypoxia exposure resulted in downregulated StAR expression but upregulated CYP11a and 3β-HSD expression in zebrafish embryos. Conversely, the expression patterns of these 3 genes were reversed in embryos in which zHIF-1α was knocked down under normoxia, suggesting that these 3 genes are regulated by HIF-1. Overall, the findings from this study indicate that HIF-1–mediated mechanisms are likely involved in the regulation of specific steroidogenic genes.
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Affiliation(s)
- Tianfeng Tan
- State Key Laboratory in Marine Pollution, City University of Hong Kong, Hong Kong SAR.,Shenzhen Key Laboratory for the Sustainable Use of Marine Biodiversity, Research Centre for the Oceans and Human Health, City University of Hong Kong Shenzhen Research Institute, Shenzhen, China.,Department of Biology and Chemistry, City University of Hong Kong, Kowloon, Hong Kong SAR
| | - Richard Man Kit Yu
- School of Environmental and Life Sciences, The University of Newcastle, Callaghan, NSW, Australia
| | - Rudolf Shiu Sun Wu
- State Key Laboratory in Marine Pollution, City University of Hong Kong, Hong Kong SAR.,Department of Science and Environmental Studies, The Hong Kong Institute of Education, Tai Po, Hong Kong SAR
| | - Richard Yuen Chong Kong
- State Key Laboratory in Marine Pollution, City University of Hong Kong, Hong Kong SAR.,Department of Biology and Chemistry, City University of Hong Kong, Kowloon, Hong Kong SAR
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20
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Robba C, Bacigaluppi S, Bragazzi N, Lavinio A, Gurnell M, Bilotta F, Menon DK. Clinical prevalence and outcome impact of pituitary dysfunction after aneurysmal subarachnoid hemorrhage: a systematic review with meta-analysis. Pituitary 2016; 19:522-35. [PMID: 27287036 DOI: 10.1007/s11102-016-0733-2] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
PURPOSE Pituitary dysfunction is reported to be a common complication following aneurysmal subarachnoid hemorrhage (aSAH). The aim of this meta-analysis is to analyze the literature on clinical prevalence, risk factors and outcome impact of pituitary dysfunction after aSAH, and to assess the possible need for pituitary screening in aSAH patients. METHODS We performed a systematic review with meta-analysis based on a comprehensive search of four databases (PubMed/MEDLINE, ISI/Web of Science, Scopus and Google Scholar). RESULTS A total of 20 papers met criteria for inclusion. The prevalence of pituitary dysfunction in the acute phase (within the first 6 months after aSAH) was 49.30 % (95 % CI 41.6-56.9), decreasing in the chronic phase (after 6 months from aSAH) to 25.6 % (95 % CI 18.0-35.1). Abnormalities in basal hormonal levels were more frequent when compared to induction tests, and the prevalence of a single pituitary hormone dysregulation was more frequent than multiple pituitary hormone dysregulation. Increasing age was associated with a lower prevalence of endocrine dysfunction in the acute phase, and surgical treatment of the aneurysm (clipping) was related to a higher prevalence of single hormone dysfunction. The prevalence of pituitary dysfunction did not correlate with the outcome of the patient. CONCLUSIONS Neuroendocrine dysfunction is common after aSAH, but these abnormalities have not been shown to consistently impact outcome in the data available. There is a need for well-designed prospective studies to more precisely assess the incidence, clinical course, and outcome impact of pituitary dysfunction after aSAH.
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Affiliation(s)
- Chiara Robba
- Neurosciences Critical Care Unit, Addenbrooke's Hospital, Cambridge University, Cambridge University Hospitals Trust, Box 1, Hills Road, Cambridge, CB2 0QQ, UK.
| | - Susanna Bacigaluppi
- Department of Neurosurgery, Galliera Hospital, Mura delle Cappuccine 14, 16128, Genoa, Italy
| | - Nicola Bragazzi
- Department of Health Sciences (DISSAL), University of Genoa, Largo Rosanna Benzi, 15, 16100, Genoa, Italy
| | - Andrea Lavinio
- Neurosciences Critical Care Unit, Addenbrooke's Hospital, Cambridge University, Cambridge University Hospitals Trust, Box 1, Hills Road, Cambridge, CB2 0QQ, UK
| | - Mark Gurnell
- Department of Medicine, Addenbrooke's Hospital, Cambridge University, Cambridge University Hospitals Trust, Box 1, Hills Road, Cambridge, CB2 0QQ, UK
| | - Federico Bilotta
- Department of Anesthesiology, University of Rome "La Sapienza", Piazzale Aldo Moro 5, 00185, Rome, Italy
| | - David K Menon
- Neurosciences Critical Care Unit, Addenbrooke's Hospital, Cambridge University, Cambridge University Hospitals Trust, Box 1, Hills Road, Cambridge, CB2 0QQ, UK
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21
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Lai KP, Li JW, Tse ACK, Cheung A, Wang S, Chan TF, Kong RYC, Wu RSS. Transcriptomic responses of marine medaka's ovary to hypoxia. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2016; 177:476-483. [PMID: 27423118 DOI: 10.1016/j.aquatox.2016.06.023] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/19/2016] [Revised: 06/24/2016] [Accepted: 06/27/2016] [Indexed: 06/06/2023]
Abstract
Hypoxia, an endocrine disruptor, is pressing global problem affecting marine organisms in over 400 "Dead Zones" worldwide. There is growing evident demonstrated the disruptive effect of hypoxia on reproductive systems of marine fish through the impairments of steroidogenic gene expression, leading to the alteration of sex hormone production in gonads. But the detailed molecular mechanism underlying the responses of female reproductive systems to hypoxic stress remains largely unknown. In the present report, we used marine medaka Oryzias melastigma as a model, together with high-throughput transcriptome sequencing and bioinformatics analysis, aiming to determine the changes in transcriptional signature in the ovary of marine fish under hypoxic stress. Our result discovered over two hundred differential expressed genes in ovary in response to hypoxia. The bioinformatics analysis together with quantitative RT-PCR validation on the deregulated genes highlighted the dysregulations of a number of female reproductive functions including interruptions of ovarian follicle development, gonad development and steroid metabolic process. Additionally, we revealed that these deregulations are through the modulation of leukemia inhibitory factor (LIF), insulin-like growth factor 1 receptor (IGF1R) and follicle stimulating hormone (FSH). The result of this work complements previous studies and provides additional insights into the underlying molecular mechanism of hypoxia-induced impairment of female reproductive system.
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Affiliation(s)
- Keng Po Lai
- Department of Biology and Chemistry, City University of Hong Kong, Hong Kong Special Administrative Region.
| | - Jing Woei Li
- School of Life Sciences, The Chinese University of Hong Kong, Hong Kong Special Administrative Region; State Key Laboratory of Agrobiotechnology, Chinese University of Hong Kong, Hong Kong Special Administrative Region.
| | - Anna Chung Kwan Tse
- School of Biological Sciences, The University of Hong Kong, Hong Kong Special Administrative Region.
| | - Angela Cheung
- Department of Biology and Chemistry, City University of Hong Kong, Hong Kong Special Administrative Region.
| | - Simon Wang
- School of Biological Sciences, The University of Hong Kong, Hong Kong Special Administrative Region.
| | - Ting Fung Chan
- School of Life Sciences, The Chinese University of Hong Kong, Hong Kong Special Administrative Region; State Key Laboratory of Agrobiotechnology, Chinese University of Hong Kong, Hong Kong Special Administrative Region.
| | - Richard Yuen Chong Kong
- Department of Biology and Chemistry, City University of Hong Kong, Hong Kong Special Administrative Region; State Key Laboratory in Marine Pollution, Hong Kong Special Administrative Region.
| | - Rudolf Shiu Sun Wu
- State Key Laboratory in Marine Pollution, Hong Kong Special Administrative Region; Department of Science and Environmental Studies, Institute of Education, Hong Kong Special Administrative Region.
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22
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Lai KP, Li JW, Chan CYS, Chan TF, Yuen KWY, Chiu JMY. Transcriptomic alterations in Daphnia magna embryos from mothers exposed to hypoxia. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2016; 177:454-463. [PMID: 27399157 DOI: 10.1016/j.aquatox.2016.06.020] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2016] [Revised: 06/22/2016] [Accepted: 06/23/2016] [Indexed: 06/06/2023]
Abstract
Hypoxia occurs when dissolved oxygen (DO) falls below 2.8mgL(-1) in aquatic environments. It can cause trans-generational effects not only in fish, but also in the water fleas Daphnia. In this study, transcriptome sequencing analysis was employed to identify transcriptomic alterations induced by hypoxia in embryos of Daphnia magna, with an aim to investigate the mechanism underlying the trans-generational effects caused by hypoxia in Daphnia. The embryos (F1) were collected from adults (F0) that were previously exposed to hypoxia (or normoxia) for their whole life. De novo transcriptome assembly identified 18270 transcripts that were matched to the UniProtKB/Swiss-Prot database and resulted in 7419 genes. Comparative transcriptome analysis showed 124 differentially expressed genes, including 70 up- and 54 down-regulated genes under hypoxia. Gene ontology analysis further highlighted three clusters of genes which revealed acclimatory changes of haemoglobin, suppression in vitellogenin gene family and histone modifications. Specifically, the expressions of histone H2B, H3, H4 and histone deacetylase 4 (HDAC4) were deregulated. This study suggested that trans-generational effects of hypoxia on Daphnia may be mediated through epigenetic regulations of histone modifications.
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Affiliation(s)
- Keng-Po Lai
- Department of Biology and Chemistry, City University of Hong Kong, Hong Kong
| | - Jing-Woei Li
- School of Life Sciences, Hong Kong Bioinformatics Centre, The Chinese University of Hong Kong, Hong Kong
| | | | - Ting-Fung Chan
- School of Life Sciences, Hong Kong Bioinformatics Centre, The Chinese University of Hong Kong, Hong Kong
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23
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Brander SM, Jeffries KM, Cole BJ, DeCourten BM, White JW, Hasenbein S, Fangue NA, Connon RE. Transcriptomic changes underlie altered egg protein production and reduced fecundity in an estuarine model fish exposed to bifenthrin. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2016; 174:247-60. [PMID: 26975043 DOI: 10.1016/j.aquatox.2016.02.014] [Citation(s) in RCA: 58] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/13/2015] [Revised: 02/15/2016] [Accepted: 02/18/2016] [Indexed: 05/15/2023]
Abstract
Pyrethroid pesticides are a class of insecticides found to have endocrine disrupting properties in vertebrates such as fishes and in human cell lines. Endocrine disrupting chemicals (EDCs) are environmental contaminants that mimic or alter the process of hormone signaling. In particular, EDCs that alter estrogen and androgen signaling pathways are of major concern for fishes because these EDCs may alter reproductive physiology, behavior, and ultimately sex ratio. Bifenthrin, a pyrethroid with escalating usage, is confirmed to disrupt estrogen signaling in several species of fish, including Menidia beryllina (inland silverside), an Atherinid recently established as a euryhaline model. Our main objective was to broadly assess the molecular and physiological responses of M. beryllina to the ng/L concentrations of bifenthrin typically found in the environment, with a focus on endocrine-related effects, and to discern links between different tiers of the biological hierarchy. As such, we evaluated the response of juvenile Menidia to bifenthrin using a Menidia-specific microarray, quantitative real-time polymerase chain reaction (qPCR) on specific endocrine-related genes of interest, and a Menidia-specific ELISA to the egg-coat protein choriogenin, to evaluate a multitude of molecular-level responses that would inform mechanisms of toxicity and any underlying causes of change at higher biological levels of organization. The sublethal nominal concentrations tested (0.5, 5 and 50ng/L) were chosen to represent the range of concentrations observed in the environment and to provide coverage of a variety of potential responses. We then employed a 21-day reproductive assay to evaluate reproductive responses to bifenthrin (at 0.5ng/L) in a separate group of adult M. beryllina. The microarray analysis indicated that bifenthrin influences a diverse suite of molecular pathways, from baseline metabolic processes to carcinogenesis. A more targeted examination of gene expression via qPCR demonstrated that bifenthrin downregulates a number of estrogen-related transcripts, particularly at the lowest exposure level. Choriogenin protein also decreased with exposure to increasing concentrations of bifenthrin, and adult M. beryllina exposed to 0.5ng/L had significantly reduced reproductive output (fertilized eggs per female). This reduction in fecundity is consistent with observed changes in endocrine-related gene expression and choriogenin production. Taken together, our results demonstrate that environmental concentrations of bifenthrin have potential to interfere with metabolic processes, endocrine signaling, and to decrease reproductive output.
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Affiliation(s)
- Susanne M Brander
- Biology & Marine Biology, University of North Carolina, Wilmington, 601 South College Road, Wilmington, NC 28403, United States.
| | - Ken M Jeffries
- Anatomy, Physiology & Cell Biology, School of Veterinary Medicine, University of California, Davis, One Shields Avenue, Davis, CA 95616, United States
| | - Bryan J Cole
- Anatomy, Physiology & Cell Biology, School of Veterinary Medicine, University of California, Davis, One Shields Avenue, Davis, CA 95616, United States
| | - Bethany M DeCourten
- Biology & Marine Biology, University of North Carolina, Wilmington, 601 South College Road, Wilmington, NC 28403, United States
| | - J Wilson White
- Biology & Marine Biology, University of North Carolina, Wilmington, 601 South College Road, Wilmington, NC 28403, United States
| | - Simone Hasenbein
- Anatomy, Physiology & Cell Biology, School of Veterinary Medicine, University of California, Davis, One Shields Avenue, Davis, CA 95616, United States
| | - Nann A Fangue
- Wildlife, Fish & Conservation Biology, University of California, Davis, One Shields Avenue, Davis, CA 95616, United States
| | - Richard E Connon
- Anatomy, Physiology & Cell Biology, School of Veterinary Medicine, University of California, Davis, One Shields Avenue, Davis, CA 95616, United States
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25
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Thomas P, Rahman MS, Picha ME, Tan W. Impaired gamete production and viability in Atlantic croaker collected throughout the 20,000 km(2) hypoxic region in the northern Gulf of Mexico. MARINE POLLUTION BULLETIN 2015; 101:182-192. [PMID: 26547103 DOI: 10.1016/j.marpolbul.2015.11.001] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/17/2015] [Revised: 10/26/2015] [Accepted: 11/01/2015] [Indexed: 05/21/2023]
Abstract
The long-term impacts of recent marked increases in the incidence and extent of hypoxia (dissolved oxygen <2 mg/L) in coastal regions worldwide on fisheries and ecosystems are unknown. Reproductive impairment was investigated in Atlantic croaker collected in 2010 from the extensive coastal hypoxic region in the northern Gulf of Mexico. Potential fecundity was significantly lower in croaker collected throughout the ~20,000 km(2) hypoxic region than in croaker from normoxic sites. In vitro bioassays of gamete viability showed reductions in oocyte maturation and sperm motility in croaker collected from the hypoxic sites in response to reproductive hormones which were accompanied by decreases in gonadal levels of membrane progestin receptor alpha, the receptor regulating these processes. The finding that environmental hypoxia exposure reduces oocyte viability in addition to decreasing oocyte production in croaker suggests that fecundity estimates need to be adjusted to account for the decrease in oocyte maturation.
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Affiliation(s)
- Peter Thomas
- Marine Science Institute, University of Texas at Austin, 750 Channel View Drive, Port Aransas, Texas 78373, USA.
| | - Md Saydur Rahman
- Marine Science Institute, University of Texas at Austin, 750 Channel View Drive, Port Aransas, Texas 78373, USA
| | - Matthew E Picha
- Marine Science Institute, University of Texas at Austin, 750 Channel View Drive, Port Aransas, Texas 78373, USA
| | - Wenxian Tan
- Marine Science Institute, University of Texas at Austin, 750 Channel View Drive, Port Aransas, Texas 78373, USA
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26
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Caulier M, Brion F, Chadili E, Turies C, Piccini B, Porcher JM, Guiguen Y, Hinfray N. Localization of steroidogenic enzymes and Foxl2a in the gonads of mature zebrafish (Danio rerio). Comp Biochem Physiol A Mol Integr Physiol 2015; 188:96-106. [PMID: 26099948 DOI: 10.1016/j.cbpa.2015.06.016] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2015] [Revised: 06/11/2015] [Accepted: 06/12/2015] [Indexed: 12/11/2022]
Abstract
In zebrafish, the identification of the cells expressing steroidogenic enzymes and their regulators is far from completely fulfilled though it could provide crucial information on the elucidation of the role of these enzymes. The aim of this study was to better characterize the expression pattern of steroidogenic enzymes involved in estrogen and androgen production (Cyp17-I, Cyp11c1, Cyp19a1a and Cyp19a1b) and one of their regulators (Foxl2a) in zebrafish gonads. By using immunohistochemistry, we localized the steroid-producing cells in mature zebrafish gonads and determined different expression patterns between males and females. All these steroidogenic enzymes and Foxl2a were detected both in the testis and ovary. In the testis, they were all localized both in Leydig and germ cells except Cyp19a1b which was only detected in germ cells. In the ovary, Cyp17-I, Cyp19a1a and Foxl2a were immunolocalized in both somatic and germ cells while Cyp19a1b was only detected in germ cells and Cyp11c1 in somatic cells. Moreover, Cyp19a1a and Foxl2a did not display exactly the same patterns of spatial localization but their expressions were correlated suggesting a possible regulation of cyp19a1a gene by Foxl2a in zebrafish. Comparative analysis revealed a dimorphic expression of Cyp11c1, Cyp19a1a, Cyp19a1b and Foxl2a between males and females. Overall, our study provides a detailed description of the expression of proteins involved in the biosynthesis of steroidal hormones at the cellular scale within gonads, which is critical to further elucidating the intimate roles of the enzymes and the use of the zebrafish as a model in the field of endocrinology.
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Affiliation(s)
- Morgane Caulier
- INERIS, Direction des Risques Chroniques, Pole VIVA, Unite d'ecotoxicologie in vitro et in vivo, BP2, 60550 Verneuil-en-Halatte, France
| | - François Brion
- INERIS, Direction des Risques Chroniques, Pole VIVA, Unite d'ecotoxicologie in vitro et in vivo, BP2, 60550 Verneuil-en-Halatte, France
| | - Edith Chadili
- INERIS, Direction des Risques Chroniques, Pole VIVA, Unite d'ecotoxicologie in vitro et in vivo, BP2, 60550 Verneuil-en-Halatte, France
| | - Cyril Turies
- INERIS, Direction des Risques Chroniques, Pole VIVA, Unite d'ecotoxicologie in vitro et in vivo, BP2, 60550 Verneuil-en-Halatte, France
| | - Benjamin Piccini
- INERIS, Direction des Risques Chroniques, Pole VIVA, Unite d'ecotoxicologie in vitro et in vivo, BP2, 60550 Verneuil-en-Halatte, France
| | - Jean-Marc Porcher
- INERIS, Direction des Risques Chroniques, Pole VIVA, Unite d'ecotoxicologie in vitro et in vivo, BP2, 60550 Verneuil-en-Halatte, France
| | - Yann Guiguen
- INRA, UR1037, Laboratoire de Physiologie et de Génomique des Poissons (LPGP), IFR140, Ouest-Genopole, F-35000 Rennes France
| | - Nathalie Hinfray
- INERIS, Direction des Risques Chroniques, Pole VIVA, Unite d'ecotoxicologie in vitro et in vivo, BP2, 60550 Verneuil-en-Halatte, France.
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27
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Testosterone regulates the autophagic clearance of androgen binding protein in rat Sertoli cells. Sci Rep 2015; 5:8894. [PMID: 25745956 PMCID: PMC4352847 DOI: 10.1038/srep08894] [Citation(s) in RCA: 56] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2014] [Accepted: 02/10/2015] [Indexed: 01/09/2023] Open
Abstract
Dysregulation of androgen-binding protein (ABP) is associated with a number of endocrine and andrology diseases. However, the ABP metabolism in Sertoli cells is largely unknown. We report that autophagy degrades ABP in rat Sertoli cells, and the autophagic clearance of ABP is regulated by testosterone, which prolongs the ABP biological half-life by inhibiting autophagy. Further studies identified that the autophagic clearance of ABP might be selectively regulated by testosterone, independent of stress (hypoxia)-induced autophagic degradation. These data demonstrate that testosterone up-regulates ABP expression at least partially by suppressing the autophagic degradation. We report a novel finding with respect to the mechanisms by which ABP is cleared, and by which the process is regulated in Sertoli cells.
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28
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Fournier S, Gulemetova R, Baldy C, Joseph V, Kinkead R. Neonatal stress affects the aging trajectory of female rats on the endocrine, temperature, and ventilatory responses to hypoxia. Am J Physiol Regul Integr Comp Physiol 2015; 308:R659-67. [PMID: 25652536 DOI: 10.1152/ajpregu.00418.2014] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2014] [Accepted: 01/28/2015] [Indexed: 11/22/2022]
Abstract
Human and animal studies on sleep-disordered breathing and respiratory regulation show that the effects of sex hormones are heterogeneous. Because neonatal stress results in sex-specific disruption of the respiratory control in adult rats, we postulate that it might affect respiratory control modulation induced by ovarian steroids in female rats. The hypoxic ventilatory response (HVR) of adult female rats exposed to neonatal maternal separation (NMS) is ∼30% smaller than controls (24), but consequences of NMS on respiratory control in aging female rats are unknown. To address this issue, whole body plethysmography was used to evaluate the impact of NMS on the HVR (12% O2, 20 min) of middle-aged (MA; ∼57 wk old) female rats. Pups subjected to NMS were placed in an incubator 3 h/day for 10 consecutive days (P3 to P12). Controls were undisturbed. To determine whether the effects were related to sexual hormone decline or aging per se, experiments were repeated on bilaterally ovariectomized (OVX) young (∼12 wk old) adult female rats. OVX and MA both reduced the HVR significantly in control rats but had little effect on the HVR of NMS females. OVX (but not aging) reduced the anapyrexic response in both control and NMS animals. These results show that hormonal decline decreases the HVR of control animals, while leaving that of NMS female animals unaffected. This suggests that neonatal stress alters the interaction between sex hormone regulation and the development of body temperature, hormonal, and ventilatory responses to hypoxia.
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Affiliation(s)
- Sébastien Fournier
- Department of Pediatrics, Centre de Recherche du Centre Hospitalier Universitaire de Québec, Université Laval, Québec, Quebec, Canada
| | - Roumiana Gulemetova
- Department of Pediatrics, Centre de Recherche du Centre Hospitalier Universitaire de Québec, Université Laval, Québec, Quebec, Canada
| | - Cécile Baldy
- Department of Pediatrics, Centre de Recherche du Centre Hospitalier Universitaire de Québec, Université Laval, Québec, Quebec, Canada
| | - Vincent Joseph
- Department of Pediatrics, Centre de Recherche du Centre Hospitalier Universitaire de Québec, Université Laval, Québec, Quebec, Canada
| | - Richard Kinkead
- Department of Pediatrics, Centre de Recherche du Centre Hospitalier Universitaire de Québec, Université Laval, Québec, Quebec, Canada
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29
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Cheung CHY, Chiu JMY, Wu RSS. Hypoxia turns genotypic female medaka fish into phenotypic males. ECOTOXICOLOGY (LONDON, ENGLAND) 2014; 23:1260-9. [PMID: 25011919 DOI: 10.1007/s10646-014-1269-8] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 06/05/2014] [Indexed: 05/26/2023]
Abstract
Hypoxia caused by eutrophication is amongst the most pressing global problems in aquatic systems. Notably, more than 400 "dead zones" have been identified worldwide, resulting in large scale collapse of fisheries and major changes in the structure and trophodynamics. Recent studies further discovered that hypoxia can also disrupt sex hormone metabolism and alter the sexual differentiation of fish, resulting in male biased F1 generations and therefore posing a threat to the sustainability of natural populations. However, it is not known whether, and if so how, hypoxia can also change the sex ratio in vertebrates that have sex-determining XX/XY chromosomes. Using the Japanese medaka (Oryzias latipes) as a model, we demonstrate, for the first time, that hypoxia can turn genotypic female fish with XX chromosomes into phenotypic males. Over half of the XX females exposed to hypoxia exhibit male secondary sexual characteristics and develop testis instead of ovary. We further revealed that hypoxia can: (a) down-regulate the vasa gene, which controls proliferation of primordial germ cells and gonadal sex differentiation into ovary, and (b) up-regulate the DMY gene which resides at the sex-determining locus of the Y chromosome, and direct testis differentiation. This is the first report that hypoxia can directly act on genes that regulate sex determination and differentiation, thereby turning genotypic females into phenotypic males and leading to a male-dominant F1 population.
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Affiliation(s)
- Catis Hin Ying Cheung
- Department of Biology and Chemistry, City University of Hong Kong, Kowloon, Hong Kong, SAR, China
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