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Peterson DR, Seemann F, Wan MT, Ye RR, Chen L, Lai KP, Yu P, Kong RYC, Au DWT. Multigenerational impacts of EE2 on reproductive fitness and immune competence of marine medaka. Aquat Toxicol 2023; 260:106584. [PMID: 37267806 DOI: 10.1016/j.aquatox.2023.106584] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/09/2022] [Revised: 04/16/2023] [Accepted: 05/16/2023] [Indexed: 06/04/2023]
Abstract
Estrogenic endocrine disrupting chemicals (EEDC) have been suspected to impact offspring in a transgenerational manner via modifications of the germline epigenome in the directly exposed generations. A holistic assessment of the concentration/ exposure duration-response, threshold level, and critical exposure windows (parental gametogenesis and embryogenesis) for the transgenerational evaluation of reproduction and immune compromise concomitantly will inform the overall EEDC exposure risk. We conducted a multigenerational study using the environmental estrogen, 17α-ethinylestradiol (EE2), and the marine laboratory model fish Oryzias melastigma (adult, F0) and their offspring (F1-F4) to identify transgenerationally altered offspring generations and phenotype persistence. Three exposure scenarios were used: short parental exposure, long parental exposure, and a combined parental and embryonic exposure using two concentrations of EE2 (33ng/L, 113ng/L). The reproductive fitness of fish was evaluated by assessing fecundity, fertilization rate, hatching success, and sex ratio. Immune competence was assessed in adults via a host-resistance assay. EE2 exposure during both parental gametogenesis and embryogenesis was found to induce concentration/ exposure duration-dependent transgenerational reproductive effects in the unexposed F4 offspring. Furthermore, embryonic exposure to 113 ng/L EE2 induced feminization of the directly exposed F1 generation, followed by subsequent masculinization of the F2 and F3 generations. A sex difference was found in the transgenerationally impaired reproductive output with F4 females being sensitive to the lowest concentration of EE2 (33 ng/L) upon long-term ancestral parent exposure (21 days). Conversely, F4 males were affected by ancestral embryonic EE2 exposure. No definitive transgenerational impacts on immune competence were identified in male or female offspring. In combination, these results indicate that EEDCs can be transgenerational toxicants that may negatively impact the reproductive success and population sustainability of fish populations.
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Affiliation(s)
- Drew R Peterson
- State Key Laboratory in Marine Pollution, Department of Chemistry, City University of Hong Kong, Kowloon, Hong Kong SAR
| | - Frauke Seemann
- Center for Coastal Studies, Department of Life Sciences, Texas A&M University - Corpus Christi, 6300 Ocean Drive, Corpus Christi, TX 78412-5800, USA.
| | - Miles T Wan
- State Key Laboratory in Marine Pollution, Department of Chemistry, City University of Hong Kong, Kowloon, Hong Kong SAR
| | - Roy R Ye
- State Key Laboratory in Marine Pollution, Department of Chemistry, City University of Hong Kong, Kowloon, Hong Kong SAR
| | - Lianguo Chen
- State Key Laboratory in Marine Pollution, Department of Chemistry, City University of Hong Kong, Kowloon, Hong Kong SAR; State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, PR China
| | - Keng P Lai
- State Key Laboratory in Marine Pollution, Department of Chemistry, City University of Hong Kong, Kowloon, Hong Kong SAR; Guilin Medical University, Guilin, 541004, PR China
| | - Peter Yu
- State Key Laboratory in Marine Pollution, Department of Chemistry, City University of Hong Kong, Kowloon, Hong Kong SAR
| | - Richard Y C Kong
- State Key Laboratory in Marine Pollution, Department of Chemistry, City University of Hong Kong, Kowloon, Hong Kong SAR
| | - Doris W T Au
- State Key Laboratory in Marine Pollution, Department of Chemistry, City University of Hong Kong, Kowloon, Hong Kong SAR
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2
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Chen L, Tsui MMP, Hu C, Wan T, Au DWT, Lam JCW, Lam PKS, Zhou B. Parental Exposure to Perfluorobutanesulfonate Impairs Offspring Development through Inheritance of Paternal Methylome. Environ Sci Technol 2019; 53:12018-12025. [PMID: 31539238 DOI: 10.1021/acs.est.9b03865] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Perfluorobutanesulfonate (PFBS), an environmental pollutant of emerging concern, significantly impairs offspring development and overall health after parental exposure. However, the true inducer of offspring developmental defects among the complexity of parental influences remains unknown. In the present study, marine medaka (Oryzias melastigma) were exposed to environmentally realistic concentrations of PFBS (0, 1, 3, and 10 μg/L) for an entire life cycle. By mixing and mating control and exposed medaka (male or female), a crossbreeding strategy was employed to produce offspring eggs from various crossbreeds, with the aim of differentiating the maternal and paternal influences. Measurements of swimming performance in larval offspring showed that larvae of exposed male parents swam hyperactively in comparison to the control larvae. Contrasting trends in PFBS transfer and maternal factor transfer (e.g., proteins and lipids) to that of swimming behavior eliminated these two factors as major inducers of offspring developmental impairment. Inheritance of the exposed paternal methylome marks in offspring may be partially responsible for abnormal swimming behavior, although different toxic mechanisms may be involved depending on the exposure concentration. Overall, these findings suggest that inheritance of epigenetic modifications implicates a long-lasting threat of PFBS to the fitness and sustainability of fish populations.
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Affiliation(s)
- Lianguo Chen
- State Key Laboratory of Freshwater Ecology and Biotechnology , Institute of Hydrobiology, Chinese Academy of Sciences , Wuhan 430072 , People's Republic of China
| | - Mirabelle M P Tsui
- State Key Laboratory of Marine Pollution , City University of Hong Kong , Kowloon, Hong Kong SAR , People's Republic of China
| | - Chenyan Hu
- School of Chemistry and Environmental Engineering , Wuhan Institute of Technology , Wuhan 430072 , People's Republic of China
| | - Teng Wan
- Department of Chemistry , City University of Hong Kong , Kowloon, Hong Kong SAR , People's Republic of China
| | - Doris W T Au
- Department of Chemistry , City University of Hong Kong , Kowloon, Hong Kong SAR , People's Republic of China
| | - James C W Lam
- State Key Laboratory of Marine Pollution , City University of Hong Kong , Kowloon, Hong Kong SAR , People's Republic of China
- Department of Science and Environmental Studies , The Education University of Hong Kong , Hong Kong SAR People's Republic of China
| | - Paul K S Lam
- State Key Laboratory of Marine Pollution , City University of Hong Kong , Kowloon, Hong Kong SAR , People's Republic of China
- Department of Chemistry , City University of Hong Kong , Kowloon, Hong Kong SAR , People's Republic of China
| | - Bingsheng Zhou
- State Key Laboratory of Freshwater Ecology and Biotechnology , Institute of Hydrobiology, Chinese Academy of Sciences , Wuhan 430072 , People's Republic of China
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Ye RR, Peterson DR, Kitamura SI, Segner H, Seemann F, Au DWT. Sex-specific immunomodulatory action of the environmentalestrogen 17α-ethynylestradiol alongside with reproductive impairment in fish. Aquat Toxicol 2018; 203:95-106. [PMID: 30099325 DOI: 10.1016/j.aquatox.2018.07.019] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2018] [Revised: 07/25/2018] [Accepted: 07/25/2018] [Indexed: 06/08/2023]
Abstract
Estrogenic endocrine disrupting chemicals (EEDCs) are present ubiquitously in sediments and aquatic ecosystems worldwide. The detrimental impact of EEDCs on the reproduction of wildlife is widely recognized. Increasing evidence shows the immunosuppressive effects of EEDCs in vertebrates. Yet, no studies have considered concomitantly EEDC-induced impacts on reproductive impairment and immune suppression in vivo, which are deemed essential for risk assessment and environmental monitoring. In this study, EE2 was used as a representative EEDC, for parallel evaluation of EEDC-induced immune suppression (immune marker gene expression, leukocyte numbers, host resistance assay, and immune competence index) and reproductive impairment (estrogen responsive gene expression, fecundity, fertilization success, hatching success, and reproductive competence index) in an established fish model (marine medaka Oryzias melastigma), considering sex-specific induction and adaptation and recovery responses under different EE2 exposure scenarios. The findings in marine medaka reveal distinct sex differences in the EE2-mediated biological responses. For female fish, low concentration of exogenous EE2 (33 ng/L) could induce hormesis (immune enhancement), enable adaptation (restored reproduction) and even boost fish resistance to bacterial challenge after abatement of EE2. However, a prolonged exposure to high levels of EE2 (113 ng/L) not only impaired F0 immune function, but also perturbed females recovering from reproductive impairment, resulting in a persistent impact on the F1 generation output. Thus, for female fish, the exposure concentration of EE2 is more critical than the dose of EE2 in determining the impacts of EE2 on immune function and reproduction. Conversely, male fish are far more sensitive than females to the presence of low levels of exogenous EE2 in water and the EE2-mediated biological impacts are clearly dose-dependent. It is also evident in male fish that direct contact of EE2 is essential to sustain impairments of immune competence and reproductive output as well as deregulation of immune function genes in vivo. The immunomodulatory pathways altered by EE2 were deciphered for male and female fish, separately. Downregulation of hepatic tlr3 and c3 (in female) and tlr3, tlr5 and c3 (in male) may be indicative of impaired fish immune competence. Taken together, impaired immune competence in the EE2-exposed fish poses an immediate thread on the survival of F0 population. Impaired reproduction in the EE2-exposed fish can directly affect F1 output. Parallel evaluation of immune competence and reproduction are important considerations when assessing the risk of sublethal levels of EE2/EEDCs in aquatic environments.
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Affiliation(s)
- Roy R Ye
- State Key Laboratory in Marine Pollution, Department of Chemistry, City University of Hong Kong, Kowloon, Hong Kong
| | - Drew R Peterson
- State Key Laboratory in Marine Pollution, Department of Chemistry, City University of Hong Kong, Kowloon, Hong Kong
| | - Shin-Ichi Kitamura
- Center for Marine Environmental Studies, Ehime University, Matsuyama, 790-8577, Japan
| | - Helmut Segner
- Centre for Fish and Wildlife Health, University of Bern, CH3012, Bern, Switzerland
| | - Frauke Seemann
- State Key Laboratory in Marine Pollution, Department of Chemistry, City University of Hong Kong, Kowloon, Hong Kong; Department of Life Sciences, Texas A&M University, Corpus Christi, TX, 78412, USA.
| | - Doris W T Au
- State Key Laboratory in Marine Pollution, Department of Chemistry, City University of Hong Kong, Kowloon, Hong Kong.
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4
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Liang C, Peng S, Li J, Lu J, Guan D, Jiang F, Lu C, Li F, He X, Zhu H, Au DWT, Yang D, Zhang BT, Lu A, Zhang G. Inhibition of osteoblastic Smurf1 promotes bone formation in mouse models of distinctive age-related osteoporosis. Nat Commun 2018; 9:3428. [PMID: 30143635 PMCID: PMC6109183 DOI: 10.1038/s41467-018-05974-z] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2018] [Accepted: 08/06/2018] [Indexed: 11/20/2022] Open
Abstract
Bone morphogenetic protein (BMP) signaling is essential for osteogenesis. However, recombinant human BMPs (rhBMPs) exhibit large inter-individual variations in local bone formation during clinical spinal fusion. Smurf1 ubiquitinates BMP downstream molecules for degradation. Here, we classify age-related osteoporosis based on distinct intraosseous BMP-2 levels and Smurf1 activity. One major subgroup with a normal BMP-2 level and elevated Smurf1 activity (BMP-2n/Smurf1e) shows poor response to rhBMP-2 during spinal fusion, when compared to another major subgroup with a decreased BMP-2 level and normal Smurf1 activity (BMP-2d/Smurf1n). We screen a chalcone derivative, i.e., 2-(4-cinnamoylphenoxy)acetic acid, which effectively inhibits Smurf1 activity and increases BMP signaling. For BMP-2n/Smurf1e mice, the chalcone derivative enhances local bone formation during spinal fusion. After conjugating to an osteoblast-targeting and penetrating oligopeptide (DSS)6, the chalcone derivative promotes systemic bone formation in BMP-2n/Smurf1e mice. This study demonstrates a precision medicine-based bone anabolic strategy for age-related osteoporosis. BMP promotes bone formation but its efficacy is limited in some patients. Here, the authors show that osteoporosis patients with a poor response to BMP have increased expression of Smurf1, which targets BMP effectors for degradation, and demonstrate that its chemical inhibition enhances BMP-mediated bone formation in mice.
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Affiliation(s)
- Chao Liang
- Law Sau Fai Institute for Advancing Translational Medicine in Bone and Joint Diseases, School of Chinese Medicine, Hong Kong Baptist University, 999077, Hong Kong, SAR, China.,Institute of Integrated Bioinfomedicine and Translational Science, School of Chinese Medicine, Hong Kong Baptist University, 999077, Hong Kong, SAR, China.,Institute of Precision Medicine and Innovative Drug Discovery, HKBU Institute for Research and Continuing Education, 518000, Shenzhen, China
| | - Songlin Peng
- Law Sau Fai Institute for Advancing Translational Medicine in Bone and Joint Diseases, School of Chinese Medicine, Hong Kong Baptist University, 999077, Hong Kong, SAR, China.,Department of Spine Surgery, Shenzhen People's Hospital, Ji Nan University Second College of Medicine, 518020, Shenzhen, China
| | - Jie Li
- School of Chinese Medicine, Faculty of Medicine, Chinese University of Hong Kong, 999077, Hong Kong, SAR, China.,Clinical Medical Laboratory of Peking University Shenzhen Hospital, 518036, Shenzhen, China
| | - Jun Lu
- Law Sau Fai Institute for Advancing Translational Medicine in Bone and Joint Diseases, School of Chinese Medicine, Hong Kong Baptist University, 999077, Hong Kong, SAR, China.,Institute of Integrated Bioinfomedicine and Translational Science, School of Chinese Medicine, Hong Kong Baptist University, 999077, Hong Kong, SAR, China.,Institute of Precision Medicine and Innovative Drug Discovery, HKBU Institute for Research and Continuing Education, 518000, Shenzhen, China
| | - Daogang Guan
- Law Sau Fai Institute for Advancing Translational Medicine in Bone and Joint Diseases, School of Chinese Medicine, Hong Kong Baptist University, 999077, Hong Kong, SAR, China.,Institute of Integrated Bioinfomedicine and Translational Science, School of Chinese Medicine, Hong Kong Baptist University, 999077, Hong Kong, SAR, China.,Institute of Precision Medicine and Innovative Drug Discovery, HKBU Institute for Research and Continuing Education, 518000, Shenzhen, China
| | - Feng Jiang
- Law Sau Fai Institute for Advancing Translational Medicine in Bone and Joint Diseases, School of Chinese Medicine, Hong Kong Baptist University, 999077, Hong Kong, SAR, China.,Zhejiang Pharmaceutical College, 315100, Ningbo, China
| | - Cheng Lu
- Law Sau Fai Institute for Advancing Translational Medicine in Bone and Joint Diseases, School of Chinese Medicine, Hong Kong Baptist University, 999077, Hong Kong, SAR, China.,Institute of Integrated Bioinfomedicine and Translational Science, School of Chinese Medicine, Hong Kong Baptist University, 999077, Hong Kong, SAR, China.,Institute of Precision Medicine and Innovative Drug Discovery, HKBU Institute for Research and Continuing Education, 518000, Shenzhen, China.,Institute of Basic Research in Clinical Medicine, China Academy of Chinese Medical Sciences, 100700, Beijing, China
| | - Fangfei Li
- Law Sau Fai Institute for Advancing Translational Medicine in Bone and Joint Diseases, School of Chinese Medicine, Hong Kong Baptist University, 999077, Hong Kong, SAR, China.,Institute of Integrated Bioinfomedicine and Translational Science, School of Chinese Medicine, Hong Kong Baptist University, 999077, Hong Kong, SAR, China.,Institute of Precision Medicine and Innovative Drug Discovery, HKBU Institute for Research and Continuing Education, 518000, Shenzhen, China
| | - Xiaojuan He
- Law Sau Fai Institute for Advancing Translational Medicine in Bone and Joint Diseases, School of Chinese Medicine, Hong Kong Baptist University, 999077, Hong Kong, SAR, China.,Institute of Integrated Bioinfomedicine and Translational Science, School of Chinese Medicine, Hong Kong Baptist University, 999077, Hong Kong, SAR, China.,Institute of Precision Medicine and Innovative Drug Discovery, HKBU Institute for Research and Continuing Education, 518000, Shenzhen, China.,Institute of Basic Research in Clinical Medicine, China Academy of Chinese Medical Sciences, 100700, Beijing, China
| | - Hailong Zhu
- Institute of Integrated Bioinfomedicine and Translational Science, School of Chinese Medicine, Hong Kong Baptist University, 999077, Hong Kong, SAR, China
| | - D W T Au
- Department of Biology and Chemistry, City University of Hong Kong, 999077, Hong Kong, SAR, China
| | - Dazhi Yang
- Department of Spine Surgery, Shenzhen People's Hospital, Ji Nan University Second College of Medicine, 518020, Shenzhen, China
| | - Bao-Ting Zhang
- School of Chinese Medicine, Faculty of Medicine, Chinese University of Hong Kong, 999077, Hong Kong, SAR, China.
| | - Aiping Lu
- Law Sau Fai Institute for Advancing Translational Medicine in Bone and Joint Diseases, School of Chinese Medicine, Hong Kong Baptist University, 999077, Hong Kong, SAR, China. .,Institute of Integrated Bioinfomedicine and Translational Science, School of Chinese Medicine, Hong Kong Baptist University, 999077, Hong Kong, SAR, China. .,Institute of Precision Medicine and Innovative Drug Discovery, HKBU Institute for Research and Continuing Education, 518000, Shenzhen, China. .,Institute of Arthritis Research, Shanghai Academy of Chinese Medical Sciences, 200032, Shanghai, China.
| | - Ge Zhang
- Law Sau Fai Institute for Advancing Translational Medicine in Bone and Joint Diseases, School of Chinese Medicine, Hong Kong Baptist University, 999077, Hong Kong, SAR, China. .,Institute of Integrated Bioinfomedicine and Translational Science, School of Chinese Medicine, Hong Kong Baptist University, 999077, Hong Kong, SAR, China. .,Institute of Precision Medicine and Innovative Drug Discovery, HKBU Institute for Research and Continuing Education, 518000, Shenzhen, China.
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5
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Tonoyama Y, Shinya M, Toyoda A, Kitano T, Oga A, Nishimaki T, Katsumura T, Oota H, Wan MT, Yip BWP, Helen MOL, Chisada S, Deguchi T, Au DWT, Naruse K, Kamei Y, Taniguchi Y. Abnormal nuclear morphology is independent of longevity in a zmpste24-deficient fish model of Hutchinson-Gilford progeria syndrome (HGPS). Comp Biochem Physiol C Toxicol Pharmacol 2018; 209:54-62. [PMID: 29567411 DOI: 10.1016/j.cbpc.2018.03.006] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/11/2017] [Revised: 03/11/2018] [Accepted: 03/16/2018] [Indexed: 12/21/2022]
Abstract
Lamin is an intermediate protein underlying the nuclear envelope and it plays a key role in maintaining the integrity of the nucleus. A defect in the processing of its precursor by a metalloprotease, ZMPSTE24, results in the accumulation of farnesylated prelamin in the nucleus and causes various diseases, including Hutchinson-Gilford progeria syndrome (HGPS). However, the role of lamin processing is unclear in fish species. Here, we generated zmpste24-deficient medaka and evaluated their phenotype. Unlike humans and mice, homozygous mutants did not show growth defects or lifespan shortening, despite lamin precursor accumulation. Gonadosomatic indices, blood glucose levels, and regenerative capacity of fins were similar in 1-year-old mutants and their wild-type (WT) siblings. Histological examination showed that the muscles, subcutaneous fat tissues, and gonads were normal in the mutants at the age of 1 year. However, the mutants showed hypersensitivity to X-ray irradiation, although p53target genes, p21 and mdm2, were induced 6 h after irradiation. Immunostaining of primary cultured cells from caudal fins and visualization of nuclei using H2B-GFP fusion proteins revealed an abnormal nuclear shape in the mutants both in vitro and in vivo. The telomere lengths were significantly shorter in the mutants compared to WT. Taken together, these results suggest that zmpste24-deficient medaka phenocopied HGPS only partially and that abnormal nuclear morphology and lifespan shortening are two independent events in vertebrates.
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Affiliation(s)
- Yasuhiro Tonoyama
- Branch Laboratory of Gene Medicine, School of Medicine, Keio University, 2 Okubo, Tsukuba, Ibaraki 300-2611, Japan
| | - Minori Shinya
- Department of Biology, Keio University, 4-1-1 Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8521, Japan
| | - Atsushi Toyoda
- Center for Information Biology, National Institute of Genetics, Yata 1111, Mishima, Shizuoka 411-8540, Japan
| | - Takeshi Kitano
- Department of Biological Sciences, Graduate School of Science and Technology, Kumamoto University, 2-39-1 Kurokami, Chuo-ku, Kumamoto 860-8555, Japan
| | - Atsunori Oga
- Department of Pathology, Yamaguchi University Graduate School of Medicine, 1-1-1 Minamikogushi, Ube, Yamaguchi 755-8505, Japan
| | - Toshiyuki Nishimaki
- Department of Anatomy, Kitasato University School of Medicine, Sagamihara, Kanagawa 252-0674, Japan
| | - Takafumi Katsumura
- Department of Anatomy, Kitasato University School of Medicine, Sagamihara, Kanagawa 252-0674, Japan
| | - Hiroki Oota
- Department of Anatomy, Kitasato University School of Medicine, Sagamihara, Kanagawa 252-0674, Japan
| | - Miles T Wan
- State Key Laboratory in Marine Pollution, Department of Chemistry, City University of, Hong Kong, China
| | - Bill W P Yip
- State Key Laboratory in Marine Pollution, Department of Chemistry, City University of, Hong Kong, China
| | - Mok O L Helen
- State Key Laboratory in Marine Pollution, Department of Chemistry, City University of, Hong Kong, China
| | - Shinichi Chisada
- Department of Preventive Medicine and Public Health, Kyorin University, School of Medicine, Tokyo 181-8611, Japan
| | - Tomonori Deguchi
- Advanced Genome Design Research Group, Biomedical Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Midorigaoka 1-8-31, Ikeda, Osaka, 563-8577, Japan
| | - Doris W T Au
- State Key Laboratory in Marine Pollution, Department of Chemistry, City University of, Hong Kong, China
| | - Kiyoshi Naruse
- Laboratory of Bioresources, National Institute for Basic Biology, National Institutes of Natural Sciences, Okazaki, Aichi 444-8585, Japan
| | - Yasuhiro Kamei
- Spectrography and Bioimaging Facility, National Institute for Basic Biology, National Institutes of Natural Sciences, Okazaki, Aichi 444-8585, Japan
| | - Yoshihito Taniguchi
- Department of Preventive Medicine and Public Health, Kyorin University, School of Medicine, Tokyo 181-8611, Japan.
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6
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Chen L, Hu C, Tsui MMP, Wan T, Peterson DR, Shi Q, Lam PKS, Au DWT, Lam JCW, Zhou B. Multigenerational Disruption of the Thyroid Endocrine System in Marine Medaka after a Life-Cycle Exposure to Perfluorobutanesulfonate. Environ Sci Technol 2018; 52:4432-4439. [PMID: 29565584 DOI: 10.1021/acs.est.8b00700] [Citation(s) in RCA: 59] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Accumulation of perfluorobutanesulfonate (PFBS) is frequently detected in biota, raising concerns about its ecological safety. However, hazardous effects of PFBS remain largely unexplored, especially for endocrine disrupting potency. In the present study, the multigenerational endocrine disrupting potential of PFBS was investigated by exposing F0 marine medaka eggs to PFBS at different concentrations (0, 1.0, 2.9, and 9.5 μg/L) until sexual maturity. The F1 and F2 generations were reared without continued exposure. Thyroidal disturbances were examined in all three generations. PFBS exposure decreased the levels of 3,5,3'-triiodothyronine (T3) in F0 female blood; however, it increased T3 or thyroxine (T4) levels in F0 brains, in which hyperthyroidism suppressed the local transcription of 5'-deiodinase 2 ( Dio2). Obviously decreased T3 was transferred to F1 eggs, although the parental influences were reversed in F1 larvae. Delayed hatching was coupled with elevated T3 levels in F1 larvae. F1 adults showed comparable symptoms of thyroidal disruption with F0 adults. A slight recovery was noted in the F2 generation, although F2 larvae still exhibited thyroid disruption and synthesized excessive T4. Our results suggested that the offspring suffered more severe dysfunction of the thyroidal axis albeit without direct exposure. This study provided the first molecular insight about PFBS toxicology on the thyroid, beneficial to both human and environmental risk assessment.
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Affiliation(s)
- Lianguo Chen
- 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
| | | | | | | | - Qipeng Shi
- State Key Laboratory of Freshwater Ecology and Biotechnology , Institute of Hydrobiology, Chinese Academy of Sciences , Wuhan 430072 , China
| | | | | | - James C W Lam
- Department of Science and Environmental Studies , The Education University of Hong Kong , Hong Kong SAR , China
| | - Bingsheng Zhou
- State Key Laboratory of Freshwater Ecology and Biotechnology , Institute of Hydrobiology, Chinese Academy of Sciences , Wuhan 430072 , China
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7
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Ye RR, Peterson DR, Seemann F, Kitamura SI, Lee JS, Lau TCK, Tsui SKW, Au DWT. Immune competence assessment in marine medaka (Orzyias melastigma)-a holistic approach for immunotoxicology. Environ Sci Pollut Res Int 2017; 24:27687-27701. [PMID: 27473621 DOI: 10.1007/s11356-016-7208-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2016] [Accepted: 07/08/2016] [Indexed: 06/06/2023]
Abstract
Many anthropogenic pollutants in coastal marine environments can induce immune impairments in wild fish and reduce their survival fitness. There is a pressing need to establish sensitive and high throughput in vivo tools to systematically evaluate the immunosuppressive effects of contaminants in marine teleosts. This study reviewed a battery of in vivo immune function detection technologies established for different biological hierarchies at molecular (immune function pathways and genes by next generation sequencing (NGS)), cellular (leukocytes profiles by flow cytometry), tissues/organ system (whole adult histo-array), and organism (host resistance assays (HRAs)) levels, to assess the immune competence of marine medaka Oryzias melastigma. This approach enables a holistic assessment of fish immune competence under different chemical exposure or environmental scenarios. The data obtained will also be useful to unravel the underlying immunotoxic mechanisms. Intriguingly, NGS analysis of hepatic immune gene expression profiles (male > female) are in support of the bacterial HRA findings, in which infection-induced mortality was consistently higher in females than in males. As such, reproductive stages and gender-specific responses must be taken into consideration when assessing the risk of immunotoxicants in the aquatic environment. The distinct phenotypic sexual dimorphism and short generation time (3 months) of marine medaka offer additional advantages for sex-related immunotoxicological investigation.
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Affiliation(s)
- Roy R Ye
- State Key Laboratory in Marine Pollution, Department of Biology and Chemistry, City University of Hong Kong, Kowloon Tong, Hong Kong
| | - Drew R Peterson
- State Key Laboratory in Marine Pollution, Department of Biology and Chemistry, City University of Hong Kong, Kowloon Tong, Hong Kong
| | - Frauke Seemann
- State Key Laboratory in Marine Pollution, Department of Biology and Chemistry, City University of Hong Kong, Kowloon Tong, Hong Kong
| | - Shin-Ichi Kitamura
- Centre for Marine Environmental Studies, Ehime University, Matsuyama, 790-8577, Japan
| | - J S Lee
- Department of Biological Science, College of Science, Sungkyunkwan University, Suwon, 440-746, South Korea
| | - Terrance C K Lau
- Department of Biomedical Sciences, City University of Hong Kong, Kowloon Tong, Hong Kong
| | - Stephen K W Tsui
- School of Biomedical Sciences, The Chinese University of Hong Kong, New Territories, Hong Kong
| | - Doris W T Au
- State Key Laboratory in Marine Pollution, Department of Biology and Chemistry, City University of Hong Kong, Kowloon Tong, Hong Kong.
- Shenzhen Key Laboratory for the Sustainable Use of Marine Biodiversity, Research Centre for the Oceans and Human Health, Shenzhen Research Institute, City University of Hong Kong, Shenzhen, 518057, China.
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8
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Liang C, Li F, Wang L, Zhang ZK, Wang C, He B, Li J, Chen Z, Shaikh AB, Liu J, Wu X, Peng S, Dang L, Guo B, He X, Au DWT, Lu C, Zhu H, Zhang BT, Lu A, Zhang G. Tumor cell-targeted delivery of CRISPR/Cas9 by aptamer-functionalized lipopolymer for therapeutic genome editing of VEGFA in osteosarcoma. Biomaterials 2017; 147:68-85. [PMID: 28938163 DOI: 10.1016/j.biomaterials.2017.09.015] [Citation(s) in RCA: 120] [Impact Index Per Article: 17.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2017] [Revised: 09/02/2017] [Accepted: 09/08/2017] [Indexed: 12/15/2022]
Abstract
Osteosarcoma (OS) is a highly aggressive pediatric cancer, characterized by frequent lung metastasis and pathologic bone destruction. Vascular endothelial growth factor A (VEGFA), highly expressed in OS, not only contributes to angiogenesis within the tumor microenvironment via paracrine stimulation of vascular endothelial cells, but also acts as an autocrine survival factor for tumor cell themselves, thus making it a promising therapeutic target for OS. CRISPR/Cas9 is a versatile genome editing technology and holds tremendous promise for cancer treatment. However, a major bottleneck to achieve the therapeutic potential of the CRISPR/Cas9 is the lack of in vivo tumor-targeted delivery systems. Here, we screened an OS cell-specific aptamer (LC09) and developed a LC09-functionalized PEG-PEI-Cholesterol (PPC) lipopolymer encapsulating CRISPR/Cas9 plasmids encoding VEGFA gRNA and Cas9. Our results demonstrated that LC09 facilitated selective distribution of CRISPR/Cas9 in both orthotopic OS and lung metastasis, leading to effective VEGFA genome editing in tumor, decreased VEGFA expression and secretion, inhibited orthotopic OS malignancy and lung metastasis, as well as reduced angiogenesis and bone lesion with no detectable toxicity. The delivery system simultaneously restrained autocrine and paracrine VEGFA signaling in tumor cells and could facilitate translating CRISPR-Cas9 into clinical cancer treatment.
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Affiliation(s)
- Chao Liang
- Law Sau Fai Institute for Advancing Translational Medicine in Bone and Joint Diseases, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong Special Administrative Region; Institute of Integrated Bioinfomedicine and Translational Science, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong Special Administrative Region; Institute of Precision Medicine and Innovative Drug Discovery, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong Special Administrative Region; Shenzhen Lab of Combinatorial Compounds and Targeted Drug Delivery, HKBU Institute of Research and Continuing Education, Shenzhen, China.
| | - Fangfei Li
- Law Sau Fai Institute for Advancing Translational Medicine in Bone and Joint Diseases, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong Special Administrative Region; Institute of Integrated Bioinfomedicine and Translational Science, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong Special Administrative Region; Institute of Precision Medicine and Innovative Drug Discovery, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong Special Administrative Region; Shenzhen Lab of Combinatorial Compounds and Targeted Drug Delivery, HKBU Institute of Research and Continuing Education, Shenzhen, China.
| | - Luyao Wang
- Law Sau Fai Institute for Advancing Translational Medicine in Bone and Joint Diseases, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong Special Administrative Region; Institute of Integrated Bioinfomedicine and Translational Science, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong Special Administrative Region; Institute of Precision Medicine and Innovative Drug Discovery, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong Special Administrative Region; Shenzhen Lab of Combinatorial Compounds and Targeted Drug Delivery, HKBU Institute of Research and Continuing Education, Shenzhen, China
| | - Zong-Kang Zhang
- School of Chinese Medicine, Faculty of Medicine, Chinese University of Hong Kong, Hong Kong Special Administrative Region
| | - Chao Wang
- Institute of Integrated Bioinfomedicine and Translational Science, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong Special Administrative Region; Institute of Precision Medicine and Innovative Drug Discovery, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong Special Administrative Region
| | - Bing He
- Institute of Integrated Bioinfomedicine and Translational Science, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong Special Administrative Region; Institute of Precision Medicine and Innovative Drug Discovery, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong Special Administrative Region; Shenzhen Lab of Combinatorial Compounds and Targeted Drug Delivery, HKBU Institute of Research and Continuing Education, Shenzhen, China
| | - Jie Li
- School of Chinese Medicine, Faculty of Medicine, Chinese University of Hong Kong, Hong Kong Special Administrative Region
| | - Zhihao Chen
- Law Sau Fai Institute for Advancing Translational Medicine in Bone and Joint Diseases, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong Special Administrative Region
| | - Atik Badshah Shaikh
- Law Sau Fai Institute for Advancing Translational Medicine in Bone and Joint Diseases, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong Special Administrative Region; Institute of Integrated Bioinfomedicine and Translational Science, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong Special Administrative Region; Institute of Precision Medicine and Innovative Drug Discovery, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong Special Administrative Region; Shenzhen Lab of Combinatorial Compounds and Targeted Drug Delivery, HKBU Institute of Research and Continuing Education, Shenzhen, China
| | - Jin Liu
- Law Sau Fai Institute for Advancing Translational Medicine in Bone and Joint Diseases, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong Special Administrative Region; Institute of Integrated Bioinfomedicine and Translational Science, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong Special Administrative Region; Institute of Precision Medicine and Innovative Drug Discovery, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong Special Administrative Region; Shenzhen Lab of Combinatorial Compounds and Targeted Drug Delivery, HKBU Institute of Research and Continuing Education, Shenzhen, China
| | - Xiaohao Wu
- Law Sau Fai Institute for Advancing Translational Medicine in Bone and Joint Diseases, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong Special Administrative Region; Institute of Integrated Bioinfomedicine and Translational Science, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong Special Administrative Region; Institute of Precision Medicine and Innovative Drug Discovery, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong Special Administrative Region; Shenzhen Lab of Combinatorial Compounds and Targeted Drug Delivery, HKBU Institute of Research and Continuing Education, Shenzhen, China
| | - Songlin Peng
- Department of Spine Surgery, Shenzhen People's Hospital, Ji Nan University Second College of Medicine, Shenzhen, China
| | - Lei Dang
- Law Sau Fai Institute for Advancing Translational Medicine in Bone and Joint Diseases, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong Special Administrative Region; Institute of Integrated Bioinfomedicine and Translational Science, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong Special Administrative Region; Institute of Precision Medicine and Innovative Drug Discovery, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong Special Administrative Region; Shenzhen Lab of Combinatorial Compounds and Targeted Drug Delivery, HKBU Institute of Research and Continuing Education, Shenzhen, China
| | - Baosheng Guo
- Law Sau Fai Institute for Advancing Translational Medicine in Bone and Joint Diseases, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong Special Administrative Region; Institute of Integrated Bioinfomedicine and Translational Science, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong Special Administrative Region; Institute of Precision Medicine and Innovative Drug Discovery, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong Special Administrative Region; Shenzhen Lab of Combinatorial Compounds and Targeted Drug Delivery, HKBU Institute of Research and Continuing Education, Shenzhen, China
| | - Xiaojuan He
- Law Sau Fai Institute for Advancing Translational Medicine in Bone and Joint Diseases, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong Special Administrative Region; Institute of Basic Research in Clinical Medicine, China Academy of Chinese Medical Sciences, Beijing, China
| | - D W T Au
- Department of Biology and Chemistry, City University of Hong Kong, Hong Kong Special Administrative Region
| | - Cheng Lu
- Institute of Basic Research in Clinical Medicine, China Academy of Chinese Medical Sciences, Beijing, China
| | - Hailong Zhu
- Law Sau Fai Institute for Advancing Translational Medicine in Bone and Joint Diseases, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong Special Administrative Region; Institute of Integrated Bioinfomedicine and Translational Science, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong Special Administrative Region; Institute of Precision Medicine and Innovative Drug Discovery, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong Special Administrative Region.
| | - Bao-Ting Zhang
- School of Chinese Medicine, Faculty of Medicine, Chinese University of Hong Kong, Hong Kong Special Administrative Region.
| | - Aiping Lu
- Law Sau Fai Institute for Advancing Translational Medicine in Bone and Joint Diseases, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong Special Administrative Region; Institute of Integrated Bioinfomedicine and Translational Science, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong Special Administrative Region; Institute of Precision Medicine and Innovative Drug Discovery, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong Special Administrative Region; Shenzhen Lab of Combinatorial Compounds and Targeted Drug Delivery, HKBU Institute of Research and Continuing Education, Shenzhen, China; Institute of Basic Research in Clinical Medicine, China Academy of Chinese Medical Sciences, Beijing, China; Institute of Arthritis Research, Shanghai Academy of Chinese Medical Sciences, Shanghai, China.
| | - Ge Zhang
- Law Sau Fai Institute for Advancing Translational Medicine in Bone and Joint Diseases, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong Special Administrative Region; Institute of Integrated Bioinfomedicine and Translational Science, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong Special Administrative Region; Institute of Precision Medicine and Innovative Drug Discovery, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong Special Administrative Region; Shenzhen Lab of Combinatorial Compounds and Targeted Drug Delivery, HKBU Institute of Research and Continuing Education, Shenzhen, China.
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9
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Leung KMY, Richardson BJ, Au DWT, Chan KM, Wong CKC. ICMPE-8: Dedicated to Professor Rudolf Wu. Mar Pollut Bull 2017; 124:569-572. [PMID: 28863977 DOI: 10.1016/j.marpolbul.2017.08.023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Affiliation(s)
- Kenneth M Y Leung
- The Swire Institute of Marine Science and School of Biological Sciences, The University of Hong Kong, Pokfulam, Hong Kong, China.
| | - Bruce J Richardson
- State Key Laboratory in Marine Pollution, City University of Hong Kong, Tat Chee Avenue, Hong Kong, China
| | - Doris W T Au
- State Key Laboratory in Marine Pollution and Department of Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China
| | - King Ming Chan
- School of Life Sciences, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China
| | - Chris K C Wong
- Croucher Institute for Environmental Sciences, Department of Biology, Hong Kong Baptist University, Kowloon, Hong Kong, China
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10
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Dong M, Seemann F, Humble JL, Liang Y, Peterson DR, Ye R, Ren H, Kim HS, Lee JS, Au DWT, Lam YW. Modification of the plasma complement protein profile by exogenous estrogens is indicative of a compromised immune competence in marine medaka (Oryzias melastigma). Fish Shellfish Immunol 2017; 70:260-269. [PMID: 28882797 DOI: 10.1016/j.fsi.2017.09.020] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2017] [Revised: 08/30/2017] [Accepted: 09/03/2017] [Indexed: 06/07/2023]
Abstract
Growing evidence suggests that the immune system of teleost is vulnerable to xenoestrogens, which are ubiquitous in the marine environment. This study detected and identified the major circulatory immune proteins deregulated by 17α-ethinylestradiol (EE2), which may be linked to fish susceptibility to pathogens in the marine medaka, Oryzias melastigma. Fish immune competence was determined using a host resistance assay to pathogenic bacteria Edwardsiella tarda. Females were consistently more susceptible to infection-induced mortality than males. Exposure to EE2 could narrow the sex gap of mortality by increasing infection-induced death in male fish. Proteomic analysis revealed that the major plasma immune proteins of adult fish were highly sexually dimorphic. EE2 induced pronounced sex-specific changes in the plasma proteome, with the male plasma composition clearly becoming "feminised". Male plasma was found to contain a higher level of fibrinogens, WAP63 and ependymin-2-like protein, which are involved in coagulation, inflammation and regeneration. For the first time, we demonstrated that expression of C1q subunit B (C1Q), an initiating factor of the classical complement pathway, was higher in males and was suppressed in both sexes in response to EE2 and bacterial challenge. Moreover, cleavage and post-translational modification of C3, the central component of the complement system, could be altered by EE2 treatment in males (C3dg down; C3g up). Multiple regression analysis indicated that C1Q is possibly an indicator of fish survival, which warrants further confirmation. The findings support the potential application of plasma immune proteins for prognosis/diagnosis of fish immune competence. Moreover, this study provides the first biochemical basis of the sex-differences in fish immunity and how these differences might be modified by xenoestrogens.
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Affiliation(s)
- Miao Dong
- State Key Laboratory in Marine Pollution, Department of Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong
| | - Frauke Seemann
- State Key Laboratory in Marine Pollution, Department of Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong
| | - Joseph L Humble
- State Key Laboratory in Marine Pollution, Department of Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong
| | - Yimin Liang
- State Key Laboratory in Marine Pollution, Department of Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong
| | - Drew R Peterson
- State Key Laboratory in Marine Pollution, Department of Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong
| | - Rui Ye
- State Key Laboratory in Marine Pollution, Department of Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong
| | - Honglin Ren
- Key Laboratory of Zoonosis Research, Ministry of Education, Institute of Zoonosis, College of Veterinary Medicine, Jilin University, Xi An Da Lu 5333, Changchun 130062, China
| | - Hui-Su Kim
- Department of Biological Science, College of Science, Sungkyunkwan University, Suwon 16419, South Korea
| | - Jae-Seong Lee
- Department of Biological Science, College of Science, Sungkyunkwan University, Suwon 16419, South Korea
| | - Doris W T Au
- State Key Laboratory in Marine Pollution, Department of Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong.
| | - Yun Wah Lam
- State Key Laboratory in Marine Pollution, Department of Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong.
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11
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Abstract
Nonmammalian vertebrates have the capacity of lifelong tooth replacement. In all vertebrates, tooth formation requires contact and interaction between the oral or pharyngeal epithelium and the underlying mesenchyme. To secure lifelong replacement, the presence of odontogenic stem cells has been postulated, particularly in the epithelial compartment. This study uses an advanced teleost fish species, the marine medaka Oryzias melastigma, a close relative to Oryzias latipes, to examine the expression and distribution of telomerase reverse transcriptase (Tert), the catalytic unit of telomerase, in developing pharyngeal teeth and to relate these data to the proliferative activity of the cells. The data are complemented by expression analysis of the pluripotency marker oct4 and bona fide stem cell marker lgr5. Tert distribution and tert expression in developing tooth germs show a dynamic spatiotemporal pattern. Tert is present first in the mesenchyme but is downregulated as the odontoblasts differentiate. In contrast, in the epithelial enamel organ, Tert is absent during early stages of tooth formation and upregulated first in ameloblasts. Later, Tert is expressed and immunolocalized throughout the entire inner enamel epithelium. The pattern of Tert distribution is largely mutually exclusive with that of proliferating cell nuclear antigen (PCNA) immunoreactivity: highly proliferative cells, as revealed by PCNA staining, are negative for Tert; conversely, PCNA-negative cells are Tert-positive. Only the early condensed mesenchyme is both Tert- and PCNA-positive. The absence of tert-positive cells in the epithelial compartment of early tooth germs is underscored by the absence of oct4- and lgr5-positive cells, suggesting ways other than stem cell involvement to secure continuous renewal.
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Affiliation(s)
- W H Tan
- 1 Department of Biological Sciences, National University of Singapore, Singapore and NUS Centre for Bioimaging Sciences (CBIS), Singapore
| | - P E Witten
- 2 Research Group Evolutionary Developmental Biology, Biology Department, Ghent University, Ghent, Belgium
| | - C Winkler
- 1 Department of Biological Sciences, National University of Singapore, Singapore and NUS Centre for Bioimaging Sciences (CBIS), Singapore
| | - D W T Au
- 3 State Key Laboratory in Marine Pollution, Department of Biology and Chemistry, City University of Hong Kong, Tat Chee Avenue, Hong Kong
| | - A Huysseune
- 2 Research Group Evolutionary Developmental Biology, Biology Department, Ghent University, Ghent, Belgium
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12
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Chen L, Au DWT, Hu C, Peterson DR, Zhou B, Qian PY. Identification of Molecular Targets for 4,5-Dichloro-2-n-octyl-4-isothiazolin-3-one (DCOIT) in Teleosts: New Insight into Mechanism of Toxicity. Environ Sci Technol 2017; 51:1840-1847. [PMID: 28026967 DOI: 10.1021/acs.est.6b05523] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Environmental pollutants are capable of concomitantly inducing diverse toxic effects. However, it is largely unknown which effects are directly induced and which effects are secondary, thus calling for definitive identification of the initiating molecular event for a pollutant to elucidate the mechanism of toxicity. In the present study, affinity pull-down assays were used to identify target proteins for 4,5-dichloro-2-n-octyl-4-isothiazolin-3-one (DCOIT), a costal pollutant of emerging concern, in various tissues (e.g., brain, liver, plasma, and gonad) from marine medaka (Oryzias melastigma) and zebrafish (Danio rerio). Pull-down results showed that, in male and female brains from medaka and zebrafish, DCOIT had a consistently high affinity for G protein alpha subunits (Gα), suggesting the targeted effects of DCOIT on signaling transduction from G protein-coupled receptors (GPCRs) and an extrapolatable mode of action in teleost brains. Validation using recombinant proteins and molecular docking analysis confirmed that binding of DCOIT to Gα protein competitively inhibited its activation by substrate. Considering the involvement of GPCRs in the regulation of myriad biological processes, including the hypothalamus-pituitary-gonadal-liver axis, binding of DCOIT to upstream Gα proteins in the brain may provide a plausible explanation for the diversity of toxic effects resulting from DCOIT challenge, especially abnormal hormonal production through the mitogen-activated protein kinase pathway. A new mechanism of action based on GPCR signaling is thus hypothesized for endocrine disrupting chemicals and warrants further research to clearly elucidate the link between GPCR signaling and endocrine disruption.
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Affiliation(s)
- Lianguo Chen
- Division of Life Science, Hong Kong University of Science and Technology , Clear Water Bay, Hong Kong SAR, China
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences , Wuhan 430072, China
| | - Doris W T Au
- State Key Laboratory in Marine Pollution, Department of Biology and Chemistry, City University of Hong Kong , Kowloon, Hong Kong SAR, China
| | - Chenyan Hu
- School of Chemistry and Environmental Engineering, Wuhan Institute of Technology , Wuhan 430072, China
| | - Drew R Peterson
- State Key Laboratory in Marine Pollution, Department of Biology and Chemistry, City University of Hong Kong , Kowloon, Hong Kong SAR, China
| | - Bingsheng Zhou
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences , Wuhan 430072, China
| | - Pei-Yuan Qian
- Division of Life Science, Hong Kong University of Science and Technology , Clear Water Bay, Hong Kong SAR, China
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13
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Chen L, Au DWT, Hu C, Zhang W, Zhou B, Cai L, Giesy JP, Qian PY. Linking genomic responses of gonads with reproductive impairment in marine medaka (Oryzias melastigma) exposed chronically to the chemopreventive and antifouling agent, 3,3'-diindolylmethane (DIM). Aquat Toxicol 2017; 183:135-143. [PMID: 28063342 DOI: 10.1016/j.aquatox.2016.12.021] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/09/2016] [Revised: 12/25/2016] [Accepted: 12/27/2016] [Indexed: 06/06/2023]
Abstract
3,3'-Diindolylmethane (DIM) has been promoted as an effective chemopreventive and antifouling additive. However, the concurrent risks or side effects of DIM are not fully understood, especially on tissues responsive to estrogen. Therefore, this study employed marine medaka (Oryzias melastigma) as a test model to evaluate relative safety and explore mechanisms of toxic action of DIM on development and function of gonad after chronic (28days) aqueous exposure to relatively low doses (0μg/L or 8.5μg/L). Integration of comprehensive toxicogenomic analysis at the transcriptome and proteome levels with apical endpoints, such as production of eggs and swimming performance of larvae, elucidated the molecular linkage in gonad from bottom up along the reproductive adverse outcome pathway. A series of sequential changes at the transcript and protein levels were linked to lesser fecundity and viability of larvae exposed to DIM. Anomalous production of vitellogenin (VTG) and eggshell proteins in testis confirmed the estrogenic potency of DIM. In the ovary, although storage of VTG was greater, lesser expressions of cathepsin enzymes blocked cleavage and incorporation of VTG into oocytes as yolk, which acted together with lower eggshell proteins to inhibit maturation of primary oocyte and thus contributed to impairment of fecundity. Overall, this study demonstrated that exposure to DIM impaired reproductive fitness. Diverse molecular initiating changes in gonads were linked to apical endpoints that could be used in assessment of risks posed by DIM on gametogenesis. In combination with chemical stability and potent endocrine disruption, the results of this study can inform decisions about the use of DIM either as chemopreventive or antifouling agent.
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Affiliation(s)
- Lianguo Chen
- Division of Life Science, Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong SAR, China
| | - Doris W T Au
- State Key Laboratory in Marine Pollution, Department of Biology and Chemistry, City University of Hong Kong, Kowloon, Hong Kong SAR, China
| | - Chenyan Hu
- School of Chemistry and Environmental Engineering, Wuhan Institute of Technology, Wuhan 430072, China
| | - Weipeng Zhang
- Division of Life Science, Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong SAR, China
| | - Bingsheng Zhou
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China
| | - Lin Cai
- Division of Life Science, Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong SAR, China
| | - John P Giesy
- Department of Veterinary Biomedical Sciences and Toxicology Centre, University of Saskatchewan, 44 Campus Drive, Saskatoon, SK S7N 5B3, Canada; Department of Zoology, and Center for Integrative Toxicology, Michigan State University, East Lansing, MI, USA
| | - Pei-Yuan Qian
- Division of Life Science, Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong SAR, China.
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14
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Kim HS, Hwang DS, Jeong CB, Au DWT, Lee JS. Identification and conservation of gene loss events of Hox gene clusters in the marine medaka (Oryzias melastigma). J Exp Zool B Mol Dev Evol 2016; 326:387-393. [PMID: 27966251 DOI: 10.1002/jez.b.22713] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/27/2016] [Revised: 10/11/2016] [Accepted: 10/17/2016] [Indexed: 11/07/2022]
Abstract
In this study, the identification of the whole Hox gene clusters (46 Hox genes) in the marine medaka Oryzias melastigma was investigated using genome assembly and RNA-seq information. Moreover, the gene loss events of Hox gene clusters, which may occur during fish evolution, were examined for a better understanding of the evolutionary status of the gene lost events of the Hox gene cluster across fish species, particularly in the genus Oryzias.
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Affiliation(s)
- Hui-Su Kim
- Department of Biological Science, College of Science, Sungkyunkwan University, Suwon, South Korea
| | - Dae-Sik Hwang
- Department of Biological Science, College of Science, Sungkyunkwan University, Suwon, South Korea
| | - Chang-Bum Jeong
- Department of Biological Science, College of Science, Sungkyunkwan University, Suwon, South Korea.,Department of Chemistry, College of Natural Sciences, Hanyang University, Seoul, South Korea
| | - Doris W T Au
- State Key Laboratory on Marine Pollution and Department of Biology and Chemistry, City University of Hong Kong, Kowloon, Hong Kong SAR, People's Republic of China
| | - Jae-Seong Lee
- Department of Biological Science, College of Science, Sungkyunkwan University, Suwon, South Korea
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15
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Chen L, Ye R, Zhang W, Hu C, Zhou B, Peterson DR, Au DWT, Lam PKS, Qian PY. Endocrine Disruption throughout the Hypothalamus–Pituitary–Gonadal–Liver (HPGL) Axis in Marine Medaka (Oryzias melastigma) Chronically Exposed to the Antifouling and Chemopreventive Agent, 3,3′-Diindolylmethane (DIM). Chem Res Toxicol 2016; 29:1020-8. [DOI: 10.1021/acs.chemrestox.6b00074] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Lianguo Chen
- HKUST
Shenzhen Research Institute and Division of Life Science, Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong SAR, China
| | | | - Weipeng Zhang
- HKUST
Shenzhen Research Institute and Division of Life Science, Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong SAR, China
| | | | - Bingsheng Zhou
- State
Key Laboratory of Freshwater Ecology and Biotechnology, Institute
of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China
| | | | | | | | - Pei-Yuan Qian
- HKUST
Shenzhen Research Institute and Division of Life Science, Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong SAR, China
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16
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Chen L, Zhang W, Ye R, Hu C, Wang Q, Seemann F, Au DWT, Zhou B, Giesy JP, Qian PY. Chronic Exposure of Marine Medaka (Oryzias melastigma) to 4,5-Dichloro-2-n-octyl-4-isothiazolin-3-one (DCOIT) Reveals Its Mechanism of Action in Endocrine Disruption via the Hypothalamus-Pituitary-Gonadal-Liver (HPGL) Axis. Environ Sci Technol 2016; 50:4492-4501. [PMID: 27035644 DOI: 10.1021/acs.est.6b01137] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
In this study, marine medaka (Oryzias melastigma) were chronically exposed for 28 days to environmentally realistic concentrations of 4,5-dichloro-2-n-octyl-4-isothiazolin-3-one (DCOIT) (0, 0.76, 2.45, and 9.86 μg/L), the active ingredient in commercial antifouling agent SeaNine 211. Alterations of the hypothalamus-pituitary-gonadal-liver (HPGL) axis were investigated across diverse levels of biological organization to reveal the underlying mechanisms of its endocrine disruptive effects. Gene transcription analysis showed that DCOIT had positive regulatory effects mainly in male HPGL axis with lesser extent in females. The stimulated steroidogenic activities resulted in increased concentrations of steroid hormones, including estradiol (E2), testosterone (T), and 11-KT-testosterone (11-KT), in the plasma of both sexes, leading to an imbalance in hormone homeostasis and increased E2/T ratio. The relatively estrogenic intracellular environment in both sexes induced the hepatic synthesis and increased the liver and plasma content of vitellogenin (VTG) or choriogenin. Furthermore, parental exposure to DCOIT transgenerationally impaired the viability of offspring, as supported by a decrease in hatching and swimming activity. Overall, the present results elucidated the estrogenic mechanisms along HPGL axis for the endocrine disruptive effects of DCOIT. The reproductive impairments of DCOIT at environmentally realistic concentrations highlights the need for more comprehensive investigations of its potential ecological risks.
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Affiliation(s)
- Lianguo Chen
- HKUST Shenzhen Research Institute and Division of Life Science, Hong Kong University of Science and Technology , Clear Water Bay, Hong Kong SAR, China
| | - Weipeng Zhang
- HKUST Shenzhen Research Institute and Division of Life Science, Hong Kong University of Science and Technology , Clear Water Bay, Hong Kong SAR, China
| | | | | | - Qiangwei Wang
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences , Wuhan 430072, China
| | | | | | - Bingsheng Zhou
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences , Wuhan 430072, China
| | - John P Giesy
- Toxicology Centre, University of Saskatchewan , 44 Campus Drive, Saskatoon, SK S7N 5B3, Canada
| | - Pei-Yuan Qian
- HKUST Shenzhen Research Institute and Division of Life Science, Hong Kong University of Science and Technology , Clear Water Bay, Hong Kong SAR, China
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Kim BM, Kim J, Choi IY, Raisuddin S, Au DWT, Leung KMY, Wu RSS, Rhee JS, Lee JS. Omics of the marine medaka (Oryzias melastigma) and its relevance to marine environmental research. Mar Environ Res 2016; 113:141-152. [PMID: 26716363 DOI: 10.1016/j.marenvres.2015.12.004] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2015] [Revised: 12/11/2015] [Accepted: 12/12/2015] [Indexed: 06/05/2023]
Abstract
In recent years, the marine medaka (Oryzias melastigma), also known as the Indian medaka or brackish medaka, has been recognized as a model fish species for ecotoxicology and environmental research in the Asian region. O. melastigma has several promising features for research, which include a short generation period (3-4 months), daily spawning, small size (3-4 cm), transparent embryos, sexual dimorphism, and ease of mass culture in the laboratory. There have been extensive transcriptome and genome studies on the marine medaka in the past decade. Such omics data can be useful in understanding the signal transduction pathways of small teleosts in response to environmental stressors. An omics-integrated approach in the study of the marine medaka is important for strengthening its role as a small fish model for marine environmental studies. In this review, we present current omics information about the marine medaka and discuss its potential applications in the study of various molecular pathways that can be targets of marine environmental stressors, such as chemical pollutants. We believe that this review will encourage the use of this small fish as a model species in marine environmental research.
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Affiliation(s)
- Bo-Mi Kim
- Department of Biological Science, College of Science, Sungkyunkwan University, Suwon, 16419, South Korea
| | - Jaebum Kim
- Department of Animal Biotechnology, College of Animal Bioscience & Technology, Konkuk University, Seoul, 05029, South Korea
| | - Ik-Young Choi
- National Instrumentation Center for Environmental Management, College of Agriculture and Life Sciences, Seoul National University, Seoul, 08826, South Korea
| | - Sheikh Raisuddin
- Department of Medical Elementology & Toxicology, Hamdard University, 110062, New Delhi, India
| | - Doris W T Au
- State Key Laboratory on Marine Pollution, City University of Hong Kong, Kowloon, Hong Kong, China
| | - Kenneth M Y Leung
- School of Biological Sciences, University of Hong Kong, Hong Kong, China
| | - Rudolf S S Wu
- School of Biological Sciences, University of Hong Kong, Hong Kong, China
| | - Jae-Sung Rhee
- Department of Marine Science, College of Natural Sciences, Incheon National University, Incheon, 22012, South Korea.
| | - Jae-Seong Lee
- Department of Biological Science, College of Science, Sungkyunkwan University, Suwon, 16419, South Korea.
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18
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Seemann F, Peterson DR, Witten PE, Guo BS, Shanthanagouda AH, Ye RR, Zhang G, Au DWT. Insight into the transgenerational effect of benzo[a]pyrene on bone formation in a teleost fish (Oryzias latipes). Comp Biochem Physiol C Toxicol Pharmacol 2015; 178:60-67. [PMID: 26456900 DOI: 10.1016/j.cbpc.2015.10.001] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/15/2015] [Revised: 09/30/2015] [Accepted: 10/05/2015] [Indexed: 02/03/2023]
Abstract
Recent cross-generational studies in teleost fish have raised the awareness that high levels of benzo[a]pyrene (BaP) could affect skeletal integrity in the directly exposed F0 and their F1-F2. However, no further details were provided about the causes for abnormalities on the molecular and cellular level and the persistence of such sub-organismal impairments at the transgenerational scale (beyond F2). Adult Oryzias latipes were exposed to 1μg/L BaP for 21days. The F1-F3 were examined for skeletal deformities, histopathological alterations of vertebral bodies and differential expression of key genes of bone metabolism. Significant increase of dorsal-ventral vertebral compression was evident in ancestrally exposed larvae. Histopathological analysis revealed abnormal loss of notochord sheath, a lack of notochord epithelial integrity, reduced bone tissue and decreased osteoblast abundance. A significant downregulation of ATF4 and/or osterix and a high biological variability of COL10, coupled with a significant deregulation of SOX9a/b in the F1-F3 suggest that ancestral BaP exposure most likely perturbed chordoblasts, chondroblast and osteoblast differentiation, resulting in defective notochord sheath repair and rendering the vertebral column more vulnerable to compression. The present findings provide novel molecular and cellular insights into BaP-induced transgenerational bone impairment in the unexposed F3. From the ecological risk assessment perspective, BaP needs to be regarded as a transgenerational skeletal toxicant, which exerts a far-reaching impact on fish survival and fitness. Given that basic mechanisms of cartilage/bone formation are conserved between medaka and mammals, the results may also shed light on the potential transgenerational effect of BaP on the genesis of skeletal diseases in humans.
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Affiliation(s)
- Frauke Seemann
- State Key Laboratory in Marine Pollution, Department of Biology and Chemistry, City University of Hong Kong, Tat Chee Avenue, Hong Kong
| | - Drew R Peterson
- State Key Laboratory in Marine Pollution, Department of Biology and Chemistry, City University of Hong Kong, Tat Chee Avenue, Hong Kong
| | - P Eckhard Witten
- Department of Biology, Ghent University, Ledeganckstraat 35, B-9000 Ghent, Belgium
| | - Bao-Sheng Guo
- Institute for Advancing Translational Medicine in Bone & Joint Diseases, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong
| | - Adamane H Shanthanagouda
- State Key Laboratory in Marine Pollution, Department of Biology and Chemistry, City University of Hong Kong, Tat Chee Avenue, Hong Kong
| | - Rui R Ye
- State Key Laboratory in Marine Pollution, Department of Biology and Chemistry, City University of Hong Kong, Tat Chee Avenue, Hong Kong
| | - Ge Zhang
- Institute for Advancing Translational Medicine in Bone & Joint Diseases, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong
| | - Doris W T Au
- State Key Laboratory in Marine Pollution, Department of Biology and Chemistry, City University of Hong Kong, Tat Chee Avenue, Hong Kong; 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 518057, China.
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19
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Liu J, Dang L, Li D, Liang C, He X, Wu H, Qian A, Yang Z, Au DWT, Chiang MWL, Zhang BT, Han Q, Yue KKM, Zhang H, Lv C, Pan X, Xu J, Bian Z, Shang P, Tan W, Liang Z, Guo B, Lu A, Zhang G. A delivery system specifically approaching bone resorption surfaces to facilitate therapeutic modulation of microRNAs in osteoclasts. Biomaterials 2015; 52:148-60. [PMID: 25818421 DOI: 10.1016/j.biomaterials.2015.02.007] [Citation(s) in RCA: 67] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2014] [Revised: 01/28/2015] [Accepted: 02/01/2015] [Indexed: 02/07/2023]
Abstract
Dysregulated microRNAs in osteoclasts could cause many skeletal diseases. The therapeutic manipulation of these pathogenic microRNAs necessitates novel, efficient delivery systems to facilitate microRNAs modulators targeting osteoclasts with minimal off-target effects. Bone resorption surfaces characterized by highly crystallized hydroxyapatite are dominantly occupied by osteoclasts. Considering that the eight repeating sequences of aspartate (D-Asp8) could preferably bind to highly crystallized hydroxyapatite, we developed a targeting system by conjugating D-Asp8 peptide with liposome for delivering microRNA modulators specifically to bone resorption surfaces and subsequently encapsulated antagomir-148a (a microRNA modulator suppressing the osteoclastogenic miR-148a), i.e. (D-Asp8)-liposome-antagomir-148a. Our results demonstrated that D-Asp8 could facilitate the enrichment of antagomir-148a and the subsequent down-regulation of miR-148a in osteoclasts in vivo, resulting in reduced bone resorption and attenuated deterioration of trabecular architecture in osteoporotic mice. Mechanistically, the osteoclast-targeted delivery depended on the interaction between bone resorption surfaces and D-Asp8. No detectable liver and kidney toxicity was found in mice after single/multiple dose(s) treatment of (D-Asp8)-liposome-antagomir-148a. These results indicated that (D-Asp8)-liposome as a promising osteoclast-targeting delivery system could facilitate clinical translation of microRNA modulators in treating those osteoclast-dysfunction-induced skeletal diseases.
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Affiliation(s)
- Jin Liu
- Institute for Advancing Translational Medicine in Bone & Joint Diseases, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong, China; Academician Chen Xinzi Workroom for Advancing Translational Medicine in Bone & Joint Diseases, Kunshan RNAi Institute, Kunshan Industrial Technology Research Institute, Kunshan, Jiangsu 215347, China; Institute of Integrated Bioinformatic Medicine and Translational Sciences, HKBU Shenzhen Research Institute and Continuing Education, Shenzhen 518057, China; Shum Yiu Foon Shum Bik Chuen Memorial Centre for Cancer and Inflammation Research, HKBU Shenzhen Research Institute and Continuing Education, Shenzhen 518057, China; Hong Kong Baptist University - Northwestern Polytechnical University Joint Research Centre for Translational Medicine on Musculoskeletal Health in Space, Shenzhen, 518057, China
| | - Lei Dang
- Institute for Advancing Translational Medicine in Bone & Joint Diseases, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong, China; Academician Chen Xinzi Workroom for Advancing Translational Medicine in Bone & Joint Diseases, Kunshan RNAi Institute, Kunshan Industrial Technology Research Institute, Kunshan, Jiangsu 215347, China; Institute of Integrated Bioinformatic Medicine and Translational Sciences, HKBU Shenzhen Research Institute and Continuing Education, Shenzhen 518057, China; Shum Yiu Foon Shum Bik Chuen Memorial Centre for Cancer and Inflammation Research, HKBU Shenzhen Research Institute and Continuing Education, Shenzhen 518057, China; Hong Kong Baptist University - Northwestern Polytechnical University Joint Research Centre for Translational Medicine on Musculoskeletal Health in Space, Shenzhen, 518057, China
| | - Defang Li
- Institute for Advancing Translational Medicine in Bone & Joint Diseases, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong, China; Academician Chen Xinzi Workroom for Advancing Translational Medicine in Bone & Joint Diseases, Kunshan RNAi Institute, Kunshan Industrial Technology Research Institute, Kunshan, Jiangsu 215347, China; Institute of Integrated Bioinformatic Medicine and Translational Sciences, HKBU Shenzhen Research Institute and Continuing Education, Shenzhen 518057, China; Shum Yiu Foon Shum Bik Chuen Memorial Centre for Cancer and Inflammation Research, HKBU Shenzhen Research Institute and Continuing Education, Shenzhen 518057, China; Hong Kong Baptist University - Northwestern Polytechnical University Joint Research Centre for Translational Medicine on Musculoskeletal Health in Space, Shenzhen, 518057, China
| | - Chao Liang
- Institute for Advancing Translational Medicine in Bone & Joint Diseases, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong, China; Academician Chen Xinzi Workroom for Advancing Translational Medicine in Bone & Joint Diseases, Kunshan RNAi Institute, Kunshan Industrial Technology Research Institute, Kunshan, Jiangsu 215347, China; Institute of Integrated Bioinformatic Medicine and Translational Sciences, HKBU Shenzhen Research Institute and Continuing Education, Shenzhen 518057, China; Shum Yiu Foon Shum Bik Chuen Memorial Centre for Cancer and Inflammation Research, HKBU Shenzhen Research Institute and Continuing Education, Shenzhen 518057, China; Hong Kong Baptist University - Northwestern Polytechnical University Joint Research Centre for Translational Medicine on Musculoskeletal Health in Space, Shenzhen, 518057, China; Key Laboratory for Space Bioscience and Biotechnology, Institute of Special Environmental Biophysics, School of Life Science, Northwestern Polytechnical University, Xi'an, 721000, China
| | - Xiaojuan He
- Institute for Advancing Translational Medicine in Bone & Joint Diseases, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong, China; Academician Chen Xinzi Workroom for Advancing Translational Medicine in Bone & Joint Diseases, Kunshan RNAi Institute, Kunshan Industrial Technology Research Institute, Kunshan, Jiangsu 215347, China; Institute of Basic Research in Clinical Medicine, China Academy of Chinese Medical Sciences, Beijing, 100700, China
| | - Heng Wu
- Institute for Advancing Translational Medicine in Bone & Joint Diseases, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong, China; Academician Chen Xinzi Workroom for Advancing Translational Medicine in Bone & Joint Diseases, Kunshan RNAi Institute, Kunshan Industrial Technology Research Institute, Kunshan, Jiangsu 215347, China
| | - Airong Qian
- Hong Kong Baptist University - Northwestern Polytechnical University Joint Research Centre for Translational Medicine on Musculoskeletal Health in Space, Shenzhen, 518057, China; Key Laboratory for Space Bioscience and Biotechnology, Institute of Special Environmental Biophysics, School of Life Science, Northwestern Polytechnical University, Xi'an, 721000, China
| | - Zhijun Yang
- Institute for Advancing Translational Medicine in Bone & Joint Diseases, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong, China
| | - Doris W T Au
- Department of Biology and Chemistry, City University of Hong Kong, 999077, Hong Kong, China
| | - Michael W L Chiang
- Department of Biology and Chemistry, City University of Hong Kong, 999077, Hong Kong, China
| | - Bao-Ting Zhang
- School of Chinese Medicine, The Chinese University of Hong Kong, Hong Kong SAR, 999077, China
| | - Quanbin Han
- Institute for Advancing Translational Medicine in Bone & Joint Diseases, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong, China
| | - Kevin K M Yue
- Institute for Advancing Translational Medicine in Bone & Joint Diseases, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong, China
| | - Hongqi Zhang
- Institute for Advancing Translational Medicine in Bone & Joint Diseases, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong, China
| | - Changwei Lv
- Department of Orthopaedics, Xijing Hospital, The Fourth Military Medical University, Xi'an, 710032, China
| | - Xiaohua Pan
- Department of Orthopaedics & Traumatology, Shenzhen People's Hospital, Second Medical College of Ji'nan University, Shenzhen, 518020, China
| | - Jiake Xu
- Molecular Lab, School of Pathology and Laboratory Medicine, University of Western Australia, Nedlands, WA 6009, Australia
| | - Zhaoxiang Bian
- Institute for Advancing Translational Medicine in Bone & Joint Diseases, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong, China
| | - Peng Shang
- Key Laboratory for Space Bioscience and Biotechnology, Institute of Special Environmental Biophysics, School of Life Science, Northwestern Polytechnical University, Xi'an, 721000, China
| | - Weihong Tan
- Department of Chemistry, University of Florida, Gainesville, FA 32611-7200, USA; Department of Physiology and Functional Genomics, University of Florida, Gainesville, FA 32611-7200, USA; Center for Research at Bio/Nano Interface, Shands Cancer Center, University of Florida, Gainesville, FA 32611-7200, USA
| | - Zicai Liang
- Institute of Integrated Bioinformatic Medicine and Translational Sciences, HKBU Shenzhen Research Institute and Continuing Education, Shenzhen 518057, China; Institute of Molecular Medicine, Peking University, Beijing, 100871, China
| | - Baosheng Guo
- Institute for Advancing Translational Medicine in Bone & Joint Diseases, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong, China; Academician Chen Xinzi Workroom for Advancing Translational Medicine in Bone & Joint Diseases, Kunshan RNAi Institute, Kunshan Industrial Technology Research Institute, Kunshan, Jiangsu 215347, China; Institute of Integrated Bioinformatic Medicine and Translational Sciences, HKBU Shenzhen Research Institute and Continuing Education, Shenzhen 518057, China; Shum Yiu Foon Shum Bik Chuen Memorial Centre for Cancer and Inflammation Research, HKBU Shenzhen Research Institute and Continuing Education, Shenzhen 518057, China; Hong Kong Baptist University - Northwestern Polytechnical University Joint Research Centre for Translational Medicine on Musculoskeletal Health in Space, Shenzhen, 518057, China; Key Laboratory for Space Bioscience and Biotechnology, Institute of Special Environmental Biophysics, School of Life Science, Northwestern Polytechnical University, Xi'an, 721000, China.
| | - Aiping Lu
- Institute for Advancing Translational Medicine in Bone & Joint Diseases, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong, China; Academician Chen Xinzi Workroom for Advancing Translational Medicine in Bone & Joint Diseases, Kunshan RNAi Institute, Kunshan Industrial Technology Research Institute, Kunshan, Jiangsu 215347, China; Institute of Integrated Bioinformatic Medicine and Translational Sciences, HKBU Shenzhen Research Institute and Continuing Education, Shenzhen 518057, China; Shum Yiu Foon Shum Bik Chuen Memorial Centre for Cancer and Inflammation Research, HKBU Shenzhen Research Institute and Continuing Education, Shenzhen 518057, China; Hong Kong Baptist University - Northwestern Polytechnical University Joint Research Centre for Translational Medicine on Musculoskeletal Health in Space, Shenzhen, 518057, China; Institute of Basic Research in Clinical Medicine, China Academy of Chinese Medical Sciences, Beijing, 100700, China.
| | - Ge Zhang
- Institute for Advancing Translational Medicine in Bone & Joint Diseases, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong, China; Academician Chen Xinzi Workroom for Advancing Translational Medicine in Bone & Joint Diseases, Kunshan RNAi Institute, Kunshan Industrial Technology Research Institute, Kunshan, Jiangsu 215347, China; Institute of Integrated Bioinformatic Medicine and Translational Sciences, HKBU Shenzhen Research Institute and Continuing Education, Shenzhen 518057, China; Shum Yiu Foon Shum Bik Chuen Memorial Centre for Cancer and Inflammation Research, HKBU Shenzhen Research Institute and Continuing Education, Shenzhen 518057, China; Hong Kong Baptist University - Northwestern Polytechnical University Joint Research Centre for Translational Medicine on Musculoskeletal Health in Space, Shenzhen, 518057, China; Key Laboratory for Space Bioscience and Biotechnology, Institute of Special Environmental Biophysics, School of Life Science, Northwestern Polytechnical University, Xi'an, 721000, China.
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20
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Chen L, Sun J, Zhang H, Au DWT, Lam PKS, Zhang W, Bajic VB, Qiu JW, Qian PY. Hepatic proteomic responses in marine medaka (Oryzias melastigma) chronically exposed to antifouling compound butenolide [5-octylfuran-2(5H)-one] or 4,5-dichloro-2-N-octyl-4-isothiazolin-3-one (DCOIT). Environ Sci Technol 2015; 49:1851-1859. [PMID: 25555223 DOI: 10.1021/es5046748] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The pollution of antifoulant SeaNine 211, with 4,5-dichloro-2-n-octyl-4-isothiazolin-3-one (DCOIT) as active ingredient, in coastal environment raises concerns on its adverse effects, including endocrine disruption and impairment of reproductive function in marine organisms. In the present study, we investigated the hepatic protein expression profiles of both male and female marine medaka (Oryzias melastigma) exposed to low concentrations of DCOIT at 2.55 μg/L (0.009 μM) or butenolide, a promising antifouling agent, at 2.31 μg/L (0.012 μM) for 28 days. The results showed that proteins involved in phase I (CYP450 enzyme) metabolism, phase II (UDPGT and GST) conjugation as well as mobilization of retinoid storage, an effective nonenzymatic antioxidant, were consistently up-regulated, possibly facilitating the accelerated detoxification of butenolide. Increased synthesis of bile acid would promote the immediate excretion of butenolide metabolites. Activation of fatty acid β-oxidation and ATP synthesis were consistent with elevated energy consumption for butenolide degradation and excretion. However, DCOIT did not significantly affect the detoxification system of male medaka, but induced a marked increase of vitellogenin (VTG) by 2.3-fold in the liver of male medaka, suggesting that there is estrogenic activity of DCOIT in endocrine disruption. Overall, this study identified the molecular mechanisms and provided sensitive biomarkers characteristic of butenolide and DCOIT in the liver of marine medaka. The low concentrations of butenolide and DCOIT used in the exposure regimes highlight the needs for systematic evaluation of their environmental risk. In addition, the potent estrogenic activity of DCOIT should be considered in the continued applications of SeaNine 211.
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Affiliation(s)
- Lianguo Chen
- Division of Life Science and Environmental Science Programs, Hong Kong University of Science and Technology , Hong Kong, China
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21
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Chen L, Zhang H, Sun J, Wong YH, Han Z, Au DWT, Bajic VB, Qian PY. Proteomic changes in brain tissues of marine medaka (Oryzias melastigma) after chronic exposure to two antifouling compounds: butenolide and 4,5-dichloro-2-n-octyl-4-isothiazolin-3-one (DCOIT). Aquat Toxicol 2014; 157:47-56. [PMID: 25456219 DOI: 10.1016/j.aquatox.2014.09.010] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/05/2014] [Revised: 09/21/2014] [Accepted: 09/23/2014] [Indexed: 06/04/2023]
Abstract
SeaNine 211 with active ingredient of 4,5-dichloro-2-n-octyl-4-isothiazolin-3-one (DCOIT) has been used as a "green" antifouling agent worldwide but has raised serious biosafety concerns in coastal environments. DCOIT has the potential to disrupt the neurotransmission in nervous system, but the underlying mechanism has not been clarified. In the present study, we used TMT six-plex labeling coupled with two-dimensional LC-MS/MS analysis to investigate the protein expression profiles in brain tissues of the marine medaka (Oryzias melastigma) after a 28-day exposure to environmentally-realistic concentration of DCOIT at 2.55 μg/L (0.009 μM) or butenolide, one promising antifouling compound, at 2.31 μg/L (0.012 μM). DCOIT and butenolide induced differential expression of 26 and 18 proteins in male brains and of 27 and 23 proteins in female brains, respectively. Distinct mechanisms of toxicity were initiated by DCOIT and butenolide in males, whereas the protein expression profiles were largely similar in females treated by these two compounds. In males, DCOIT exposure mainly led to disruption of mitogen-activated protein kinase (MAPK) signaling pathway, while butenolide affected proteins related to the cytoskeletal disorganization that is considered as a general response to toxicant stress. Furthermore, a sex-dependent protein expression profile was also noted between male and female fish, as evident by the inverse changes in the expressions of common proteins (5 proteins for butenolide- and 2 proteins for DCOIT-exposed fish). Overall, this study provided insight into the molecular mechanisms underlying the toxicity of DCOIT and butenolide. The extremely low concentrations used in this study highlighted the ecological relevance, arguing for thorough assessments of their ecological risks before the commercialization of any new antifouling compound.
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Affiliation(s)
- Lianguo Chen
- Division of Life Science and Environmental Science Programs, Hong Kong University of Science and Technology, Hong Kong, China
| | - Huoming Zhang
- Biosciences Core Laboratory, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia
| | - Jin Sun
- Department of Biology, Hong Kong Baptist University, Hong Kong, China
| | - Yue-Him Wong
- Division of Life Science and Environmental Science Programs, Hong Kong University of Science and Technology, Hong Kong, China
| | - Zhuang Han
- Division of Life Science and Environmental Science Programs, Hong Kong University of Science and Technology, Hong Kong, China
| | - Doris W T Au
- State Key Laboratory in Marine Pollution, Department of Biology and Chemistry, City University of Hong Kong, Hong Kong, China
| | - Vladimir B Bajic
- Computational Bioscience Research Center, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia
| | - Pei-Yuan Qian
- Division of Life Science and Environmental Science Programs, Hong Kong University of Science and Technology, Hong Kong, China.
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22
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Fong CC, Shi YF, Yu WK, Wei F, van de Merwe JP, Chan AKY, Ye R, Au DWT, Wu RSS, Yang MS. iTRAQ-based proteomic profiling of the marine medaka (Oryzias melastigma) gonad exposed to BDE-47. Mar Pollut Bull 2014; 85:471-478. [PMID: 24854047 DOI: 10.1016/j.marpolbul.2014.04.024] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/20/2013] [Revised: 04/05/2014] [Accepted: 04/08/2014] [Indexed: 06/03/2023]
Abstract
A recent study demonstrated that 2,2',4,4'-tetrabromodiphenyl ether (BDE-47) may have an adverse effect on the reproduction in marine medaka (Oryzias melastigma), but the molecular mechanisms remain largely unknown. In this study, we investigated the protein expression profiles of male and female gonads of O. melastigma exposed to dietary BDE-47 at two dosages (0.65 and 1.30 μg/g/day, respectively) for 21 days. Extracted proteins were labeled with iTRAQ and analyzed on a MALDI TOF/TOF analyzer, as results, 133 and 144 unique proteins were identified in testis and ovary, respective, and they exerted dose- and sex-dependent expression patterns. In testis, among the 42 differentially expressed proteins; down-regulation of histone variants and parvalbumins implicated BDE-47 may disrupt the spermatogenesis and induce sterility in fishes. In ovary, 38 proteins were differentially expressed; the elevation of vitellogenins and apolipoprotein A-I expression indicated BDE-47 acts as an estrogen-mimicking compound and led to reproductive impairment in O. melastigma.
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Affiliation(s)
- C C Fong
- State Key Laboratory in Marine Pollution, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong; Shenzhen Key Laboratory of Biochip Research, City University of Hong Kong, Shenzhen 518057, PR China
| | - Y F Shi
- Shenzhen Key Laboratory of Biochip Research, City University of Hong Kong, Shenzhen 518057, PR China; Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China
| | - W K Yu
- State Key Laboratory in Marine Pollution, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong
| | - F Wei
- Shenzhen Key Laboratory of Biochip Research, City University of Hong Kong, Shenzhen 518057, PR China
| | - J P van de Merwe
- State Key Laboratory in Marine Pollution, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong
| | - Alice K Y Chan
- State Key Laboratory in Marine Pollution, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong
| | - R Ye
- State Key Laboratory in Marine Pollution, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong
| | - Doris W T Au
- State Key Laboratory in Marine Pollution, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong
| | - Rudolf S S Wu
- School of Biological Science, The University of Hong Kong, Hong Kong
| | - M S Yang
- State Key Laboratory in Marine Pollution, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong; Shenzhen Key Laboratory of Biochip Research, City University of Hong Kong, Shenzhen 518057, PR China.
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23
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Chen L, Ye R, Xu Y, Gao Z, Au DWT, Qian PY. Comparative safety of the antifouling compound butenolide and 4,5-dichloro-2-n-octyl-4-isothiazolin-3-one (DCOIT) to the marine medaka (Oryzias melastigma). Aquat Toxicol 2014; 149:116-125. [PMID: 24583292 DOI: 10.1016/j.aquatox.2014.01.023] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2013] [Revised: 01/22/2014] [Accepted: 01/27/2014] [Indexed: 06/03/2023]
Abstract
This study evaluated the potential adverse effects of butenolide, a promising antifouling compound, using the marine medaka (Oryzias melastigma), a model fish for marine ecotoxicology. The active ingredient used in the commercial antifoulant SeaNine 211, 4,5-dichloro-2-n-octyl-4-isothiazolin-3-one (DCOIT) was employed as the positive control. Adult marine medaka (4-month-old) were exposed to various concentrations of butenolide or DCOIT for 28 days and then depurated in clean seawater for 14 days (recovery). A suite of sensitive biomarkers, including hepatic oxidative stress, neuronal signal transmission, endocrine disruption, and reproductive function, was used to measure significant biological effects induced by the chemicals. Compared to DCOIT, chronic exposure to butenolide induced a lower extent of oxidative stress in the liver of male and female medaka. Furthermore, butenolide-exposed fish could recover faster from oxidative stress than fish exposed to DCOIT. Regarding neurotransmission, DCOIT significantly inhibited acetylcholinesterase (AChE) activity in the brain of both male and female medaka, whereas this was not significant for butenolide. In addition, plasma estradiol (E2) level was elevated and testosterone (T) level was decreased in male medaka exposed to DCOIT. This greatly imbalanced sex hormones ratio (E2/T) in exposed males, indicating that DCOIT is a potent endocrine disruptive chemical. In contrast, butenolide induced only moderate effects on sex hormone levels in exposed males, which could be gradually recovered during depuration. Moreover, the endocrine disruptive effect induced by butenolide did not affect normal development of offspring. In contrast, DCOIT-exposed fish exhibited a decrease of egg production and impaired reproductive success. Overall, the above findings demonstrated that chronic exposure to butenolide induced transient, reversible biological effect on marine medaka, while DCOIT could impair reproductive success of fish, as evident by clear alterations of the E2/T ratio. The relatively low toxicity of butenolide on marine biota highlights its promising application in the antifouling industry. The present findings also emphasize gender difference in fish susceptibility to chemical treatment (male>female), which is an important consideration for ecological risk assessment.
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Affiliation(s)
- Lianguo Chen
- Division of Life Science, Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong Special Administrative Region
| | - Rui Ye
- State Key Laboratory in Marine Pollution, Department of Biology and Chemistry, City University of Hong Kong, Kowloon, Hong Kong Special Administrative Region
| | - Ying Xu
- Division of Life Science, Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong Special Administrative Region
| | - Zhaoming Gao
- Division of Life Science, Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong Special Administrative Region
| | - Doris W T Au
- State Key Laboratory in Marine Pollution, Department of Biology and Chemistry, City University of Hong Kong, Kowloon, Hong Kong Special Administrative Region
| | - Pei-Yuan Qian
- Division of Life Science, Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong Special Administrative Region.
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Shanthanagouda AH, Guo BS, Ye RR, Chao L, Chiang MWL, Singaram G, Cheung NKM, Zhang G, Au DWT. Japanese medaka: a non-mammalian vertebrate model for studying sex and age-related bone metabolism in vivo. PLoS One 2014; 9:e88165. [PMID: 24523879 PMCID: PMC3921145 DOI: 10.1371/journal.pone.0088165] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2013] [Accepted: 01/05/2014] [Indexed: 11/26/2022] Open
Abstract
Background In human, a reduction in estrogen has been proposed as one of the key contributing factors for postmenopausal osteoporosis. Rodents are conventional models for studying postmenopausal osteoporosis, but the major limitation is that ovariectomy is needed to mimic the estrogen decline after menopause. Interestingly, in medaka fish (Oryzias latipes), we observed a natural drop in plasma estrogen profile in females during aging and abnormal spinal curvature was apparent in old fish, which are similar to postmenopausal women. It is hypothesized that estrogen associated disorders in bone metabolism might be predicted and prevented by estrogen supplement in aging O. latipes, which could be corresponding to postmenopausal osteoporosis in women. Principal findings In O. latipes, plasma estrogen was peaked at 8 months old and significantly declined after 10, 11 and 22 months in females. Spinal bone mineral density (BMD) and micro-architecture by microCT measurement progressively decreased and deteriorated from 8 to 10, 12 and 14 months old, which was more apparent in females than the male counterparts. After 10 months old, O. latipes were supplemented with 17α-ethinylestradiol (EE2, a potent estrogen mimic) at 6 and 60 ng/mg fish weight/day for 4 weeks, both reduction in spinal BMD and deterioration in bone micro-architecture were significantly prevented. The estrogenic effect of EE2 in O. latipes was confirmed by significant up-regulation of four key estrogen responsive genes in the liver. In general, bone histomorphometric analyses indicated significantly lowered osteoblasts and osteoclasts numbers and surfaces on vertebrae of EE2-fed medaka. Significance We demonstrate osteoporosis development associated with natural drop in estrogen level during aging in female medaka, which could be attenuated by estrogen treatment. This small size fish is a unique alternative non-mammalian vertebrate model for studying estrogen-related molecular regulation in postmenopausal skeletal disorders in vivo without ovariectomy.
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Affiliation(s)
- Admane H. Shanthanagouda
- State Key Laboratory in Marine Pollution, Department of Biology and Chemistry, City University of Hong Kong, Hong Kong
| | - Bao-Sheng Guo
- Institute for Advancing Translational Medicine in Bone & Joint Diseases, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong
| | - Rui R. Ye
- State Key Laboratory in Marine Pollution, Department of Biology and Chemistry, City University of Hong Kong, Hong Kong
| | - Liang Chao
- Institute for Advancing Translational Medicine in Bone & Joint Diseases, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong
| | - Michael W. L. Chiang
- State Key Laboratory in Marine Pollution, Department of Biology and Chemistry, City University of Hong Kong, Hong Kong
| | - Gopalakrishnan Singaram
- State Key Laboratory in Marine Pollution, Department of Biology and Chemistry, City University of Hong Kong, Hong Kong
| | - Napo K. M. Cheung
- State Key Laboratory in Marine Pollution, Department of Biology and Chemistry, City University of Hong Kong, Hong Kong
| | - Ge Zhang
- Institute for Advancing Translational Medicine in Bone & Joint Diseases, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong
- * E-mail: (DWTA); (GZ)
| | - Doris W. T. Au
- State Key Laboratory in Marine Pollution, Department of Biology and Chemistry, City University of Hong Kong, Hong Kong
- * E-mail: (DWTA); (GZ)
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Tao Y, Mao X, Hu J, Mok HOL, Wang L, Au DWT, Zhu J, Zhang X. Mechanisms of photosynthetic inactivation on growth suppression of Microcystis aeruginosa under UV-C stress. Chemosphere 2013; 93:637-644. [PMID: 23838039 DOI: 10.1016/j.chemosphere.2013.06.031] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/04/2012] [Revised: 06/09/2013] [Accepted: 06/11/2013] [Indexed: 06/02/2023]
Abstract
This study aims to investigate the effects of UV-C irradiation on photosynthetic processes of Microcystis aeruginosa to unravel the mechanism(s) involved in how and in what ways UV-C mediates growth suppression and cellular recovery. Changes in the concentration of photosynthetic pigments, photochemical efficiency, PS II core protein (D1) content, and the coding genes expressions were measured. The results indicate that UV-C doses at 20-200 mJ cm(-2) lead to rapid reduction in gene expression of both psbA (for D1) and cpc (for phycocyanin), but the suppression was short term and recoverable within 3 d of post-UV incubation. Conversely, UV-C doses at ≥50 mJ cm(-2) could induce marked decline in photochemical efficiency (represented by the optimal PS II quantum yield, FV/FM, and the effective PS II quantum yield, Y) as well as decreases in D1 content and water soluble pigments (phycoerythrins, phycocyanins, allophycocyanins) in M. aeruginosa during the post UV-C incubation period. The results suggest that interruption of both the light energy harvesting apparatus (especially the water soluble pigments) and the photochemical process mainly accounted for the growth suppression effect in UV-C irradiated M. aeruginosa.
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Affiliation(s)
- Yi Tao
- Key Laboratory of Microorganism Application and Risk Control (MARC) of Shenzhen, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China; State Key Laboratory on Marine Pollution, Department of Biology and Chemistry, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong
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26
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Cheung NKM, Cheung ACK, Ye RR, Ge W, Giesy JP, Au DWT. Expression profile of oestrogen receptors and oestrogen-related receptors is organ specific and sex dependent: the Japanese medaka Oryzias latipes model. J Fish Biol 2013; 83:295-310. [PMID: 23902307 DOI: 10.1111/jfb.12164] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/15/2012] [Revised: 05/21/2013] [Accepted: 05/01/2013] [Indexed: 06/02/2023]
Abstract
Gene expression of all known subtypes of oestrogen receptor (ER) and oestrogen-related receptor (ERR) in multiple organs and both sexes of the Japanese medaka Oryzias latipes was profiled and systematically analysed. As revealed by statistical analyses and low-dimensional projections, the expressions of ERRs proved to be organ and sex dependent, which is in contrast with the ubiquitous nature of ERs. Moreover, expressions of specific ERR isoforms (ERRγ1, ERRγ2) were strongly correlated with that of all ERs (ERα, ERβ1 and ERβ2), suggesting the existence of potential interactions. Findings of this study shed light on the co-regulatory role of particular ERRs in oestrogen-ERs signalling and highlight the potential importance of ERRs in determining organ and sex-specific oestrogen responses. Using O. latipes as an alternative vertebrate model, this study provides new directions that call for collective efforts from the scientific community to unravel the mechanistic action of ER-ERR cross-talks, and their intertwining functions, in a cell and sex-specific manner in vivo.
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Affiliation(s)
- N K M Cheung
- Department of Biology and Chemistry, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong SAR
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27
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Kim RO, Kim BM, Hwang DS, Au DWT, Jung JH, Shim WJ, Leung KMY, Wu RSS, Rhee JS, Lee JS. Evaluation of biomarker potential of cytochrome P450 1A (CYP1A) gene in the marine medaka, Oryzias melastigma exposed to water-accommodated fractions (WAFs) of Iranian crude oil. Comp Biochem Physiol C Toxicol Pharmacol 2013. [PMID: 23178197 DOI: 10.1016/j.cbpc.2012.11.003] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
CYP1A is involved in the metabolism of diverse chemicals, including polycyclic aromatic hydrocarbons and alkylated-PAHs, as a first line of detoxification mechanism. First, we identified and characterized the CYP1A gene from the marine medaka, Oryzias melastigma. O. melastigma CYP1A (Om-CYP1A) showed a high similarity of motifs/domains compared to those of vertebrates in their amino acid sequences. To check whether the Om-CYP1A would be inducible, we tested two strong CYP1A inducers, β-naphthoflavone (β-NF) and benzo[α]pyrene (B[α]P), and observed concentration-dependent transient expression on transcripts of Om-CYP1A for 96 h over a wide range of concentrations. Om-CYP1A mRNA level was significantly increased in exposure to different concentrations of β-NF and B[α]P, and its expression was highly transcribed within 12 h upon the exposure to low concentrations of both chemicals. Inducible transcript profiles revealed that Om-CYP1A would be associated with the toxicant metabolism via AhREs/DREs/XREs in its promoter region. To uncover the effects of the water-accommodated fraction (WAF) of crude oil on transcripts of Om-CYP1A, we measured mRNA expression of Om-CYP1A towards different concentrations of WAF for 24h. As a result, WAF exposure significantly increased Om-CYP1A transcripts at all concentrations as well as during time-course experiments for 96 h. In this paper, we demonstrated that WAF would trigger up-regulation of the CYP1A gene that would be associated with the initiation of the cellular defense systems. This finding provides a better understanding of the molecular mechanism of cellular protection particularly that involved in the WAF-mediated cellular response in O. melastigma.
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Affiliation(s)
- Ryeo-Ok Kim
- Department of Chemistry, College of Natural Sciences, Hanyang University, Seoul 133-791, South Korea
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28
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Zhu XM, Yuan J, Leung KCF, Lee SF, Sham KWY, Cheng CHK, Au DWT, Teng GJ, Ahuja AT, Wang YXJ. Hollow superparamagnetic iron oxide nanoshells as a hydrophobic anticancer drug carrier: intracelluar pH-dependent drug release and enhanced cytotoxicity. Nanoscale 2012; 4:5744-54. [PMID: 22895638 DOI: 10.1039/c2nr30960b] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
With curcumin and doxorubicin (DOX) base as model drugs, intracellular delivery of hydrophobic anticancer drugs by hollow structured superparamagnetic iron oxide (SPIO) nanoshells (hydrodynamic diameter: 191.9 ± 2.6 nm) was studied in glioblastoma U-87 MG cells. SPIO nanoshell-based encapsulation provided a stable aqueous dispersion of the curcumin. After the SPIO nanoshells were internalized by U-87 MG cells, they localized at the acidic compartments of endosomes and lysosomes. In endosome/lysosome-mimicking buffers with a pH of 4.5-5.5, pH-dependent drug release was observed from curcumin or DOX loaded SPIO nanoshells (curcumin/SPIO or DOX/SPIO). Compared with the free drug, the intracellular curcumin content delivered via curcumin/SPIO was 30 fold higher. Increased intracellular drug content for DOX base delivered via DOX/SPIO was also confirmed, along with a fast intracellular DOX release that was attributed to its protonation in the acidic environment. DOX/SPIO enhanced caspase-3 activity by twofold compared with free DOX base. The concentration that induced 50% cytotoxic effect (CC(50)) was 0.05 ± 0.03 μg ml(-1) for DOX/SPIO, while it was 0.13 ± 0.02 μg ml(-1) for free DOX base. These results suggested SPIO nanoshells might be a promising intracellular carrier for hydrophobic anticancer drugs.
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Affiliation(s)
- Xiao-Ming Zhu
- Department of Imaging and Interventional Radiology, Prince of Wales Hospital, The Chinese University of Hong Kong, Shatin, NT, Hong Kong SAR, P. R. China
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29
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Hwang DS, Kim BM, Au DWT, Lee JS. Complete mitochondrial genome of the marine medaka Oryzias melastigma (Beloniformes, Adrianichthyidae). ACTA ACUST UNITED AC 2012; 23:308-9. [PMID: 22708854 DOI: 10.3109/19401736.2012.683181] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
The complete mitochondrial genome was obtained from the assembled genome data sequenced by next-generation sequencer from the marine medaka Oryzias melastigma. The mitochondrial genome sequence was 16,864 bp in size, and the gene order and contents were identical with those of previously reported fish mitochondrial genomes. Of 13 protein-coding genes (PCGs), 4 genes (CO3, ND3, ND4, and Cytb) had incomplete stop codons. The base composition of O. melastigma mitogenome showed high A+T (59.65%) and anti-G bias (8.73%) on the 3rd position of PCGs.
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Affiliation(s)
- Dae-Sik Hwang
- Department of Molecular and Environmental Bioscience, Graduate School, Hanyang University, Seoul 133-791, South Korea
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30
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Qiao T, Wu G, Zhang X, Au DWT, Zhang J. Effect of membrane properties on the performance of a hybrid GAC and ultrafiltration process for water treatment. Environ Technol 2012; 33:1353-1359. [PMID: 22856309 DOI: 10.1080/09593330.2011.626801] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The performance of a hybrid granular activated carbon (GAC) and ultrafiltration (UF) process for water treatment was investigated using five types of UF membranes. The removal percentages for chemical oxygen demand (COD(Mn)), particles (> or = 2 microm) and total bacteria by the hybrid process were 30-40%, 98-99% and 76-92%, respectively. No invertebrates were detected in the hybrid process effluent. Transmembrane pressure and specific permeate flux (SPF) of the five types of membranes varied. With decreasing membrane pore sizes, removal of COD(Mn) and particles increased, whereas SPF firstly decreased and then increased. Hydrophilic membranes had a relatively high COD(Mn) removal potential, but did not obviously affect particle removal or SPF.
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Affiliation(s)
- Tiejun Qiao
- Research Centre for Environmental Engineering and Management, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China
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31
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Cheung NKM, Hinton DE, Au DWT. A high-throughput histoarray for quantitative molecular profiling of multiple, uniformly oriented medaka (Oryzias latipes) embryos. Comp Biochem Physiol C Toxicol Pharmacol 2012; 155:18-25. [PMID: 21664293 DOI: 10.1016/j.cbpc.2011.05.010] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/13/2011] [Revised: 05/18/2011] [Accepted: 05/20/2011] [Indexed: 11/18/2022]
Abstract
Embryos of aquatic animal model fish have proven to be useful organisms for developmental biology and for early life stage toxicity tests. By virtue of their transparent chorions, imaging of normal and abnormal development can be detected and related to exposure or to alterations due to environmental factors. However, the detection of changes at sub-individual levels of organization is hampered by time required to detect important events within cells and tissues of affected organisms. We describe herein development of a highly cost effective embryo chip enabling stringent inter-individual comparisons and multiplex detection in embryos and eleutheroembryos. As a proof of principle we examine cell proliferation and controlled cell death in normoxic and hypoxic conditions and relate these to tissue turnover in individual organisms. Coupled with a recently developed whole adult animal platform, we can now move beyond the common approach focusing on single target organ to the detection and characterization of systemic phenomena (syndromes) affecting the organism. Taken together, we can now determine adult consequences of early life stage exposure and assess ability of exposed individuals to respond to stresses superimposed along the axis of time.
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Affiliation(s)
- Napo K M Cheung
- State Key Laboratory in Marine Pollution and Department of Biology and Chemistry, City University of Hong Kong, Kowloon, Hong Kong Special Administrative Region
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32
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Au DWT. 15th International Symposium on Toxicity Assessment : new directions in ecotoxicology and meeting the challenges ahead. Environ Sci Pollut Res Int 2011; 19:2463-4. [PMID: 22678546 DOI: 10.1007/s11356-012-1001-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/16/2012] [Accepted: 05/21/2012] [Indexed: 05/18/2023]
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33
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Ye RR, Lei ENY, Lam MHW, Chan AKY, Bo J, van de Merwe JP, Fong ACC, Yang MMS, Lee JS, Segner HE, Wong CKC, Wu RSS, Au DWT. Gender-specific modulation of immune system complement gene expression in marine medaka Oryzias melastigma following dietary exposure of BDE-47. Environ Sci Pollut Res Int 2011; 19:2477-87. [PMID: 22828878 PMCID: PMC3404281 DOI: 10.1007/s11356-012-0887-z] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/07/2011] [Accepted: 03/20/2012] [Indexed: 05/11/2023]
Abstract
BDE-47 is one of the most widely found congeners of PBDEs in marine environments. The potential immunomodulatory effects of BDE-47 on fish complement system were studied using the marine medaka Oryzias melastigma as a model fish. Three-month-old O. melastigma were subjected to short-term (5 days) and long-term (21 days) exposure to two concentrations of BDE-47 (low dose at 290 ± 172 ng/day; high dose at 580 ± 344 ng/day) via dietary uptake of BDE-47 encapsulated in Artemia nauplii. Body burdens of BDE-47 and other metabolic products were analyzed in the exposed and control fish. Only a small amount of debrominated product, BDE-28, was detected, while other metabolic products were all under detection limit. Transcriptional expression of six major complement system genes involved in complement activation: C1r/s (classical pathway), MBL-2 (lectin pathway), CFP (alternative pathway), F2 (coagulation pathway), C3 (the central component of complement system), and C9 (cell lysis) were quantified in the liver of marine medaka. Endogenous expression of all six complement system genes was found to be higher in males than in females (p < 0.05). Upon dietary exposure of marine medaka to BDE-47, expression of all six complement genes were downregulated in males at day 5 (or longer), whereas in females, MBl-2, CFP, and F2 mRNAs expression were upregulated, but C3 and C9 remained stable with exposure time and dose. A significant negative relationship was found between BDE-47 body burden and mRNA expression of C1r/s, CFP, and C3 in male fish (r = -0.8576 to -0.9447). The above findings on changes in complement gene expression patterns indicate the complement system may be compromised in male O. melastigma upon dietary exposure to BDE-47. Distinct gender difference in expression of six major complement system genes was evident in marine medaka under resting condition and dietary BDE-47 challenge. The immunomodulatory effects of BDE-47 on transcriptional expression of these complement components in marine medaka were likely induced by the parent compound instead of biotransformed products. Our results clearly demonstrate that future direction for fish immunotoxicology and risk assessment of immunosuppressive chemicals must include parallel evaluation for both genders.
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Affiliation(s)
- Roy R. Ye
- State Key Laboratory in Marine Pollution, Department of Biology and Chemistry, City University of Hong Kong, Kowloon, Hong Kong
| | - Elva N. Y. Lei
- State Key Laboratory in Marine Pollution, Department of Biology and Chemistry, City University of Hong Kong, Kowloon, Hong Kong
| | - Michael H. W. Lam
- State Key Laboratory in Marine Pollution, Department of Biology and Chemistry, City University of Hong Kong, Kowloon, Hong Kong
| | - Alice K. Y. Chan
- State Key Laboratory in Marine Pollution, Department of Biology and Chemistry, City University of Hong Kong, Kowloon, Hong Kong
| | - Jun Bo
- State Key Laboratory in Marine Pollution, Department of Biology and Chemistry, City University of Hong Kong, Kowloon, Hong Kong
| | - Jason P. van de Merwe
- State Key Laboratory in Marine Pollution, Department of Biology and Chemistry, City University of Hong Kong, Kowloon, Hong Kong
| | - Amy C. C. Fong
- State Key Laboratory in Marine Pollution, Department of Biology and Chemistry, City University of Hong Kong, Kowloon, Hong Kong
| | - Michael M. S. Yang
- State Key Laboratory in Marine Pollution, Department of Biology and Chemistry, City University of Hong Kong, Kowloon, Hong Kong
| | - J. S. Lee
- National Research Lab of Marine Molecular and Environmental Bioscience, Department of Chemistry College of Natural Sciences, Hanyang University, Seoul, South Korea
| | - Helmut E. Segner
- Centre for Fish and Wildlife Health, University of Bern, CH3012 Bern, Switzerland
| | - Chris K. C. Wong
- Department of Biology, Baptist University of Hong Kong, Kowloon Tong, Hong Kong
| | - Rudolf S. S. Wu
- School of Biological Science, The University of Hong Kong, Pokfulam, Hong Kong
| | - Doris W. T. Au
- State Key Laboratory in Marine Pollution, Department of Biology and Chemistry, City University of Hong Kong, Kowloon, Hong Kong
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Won EJ, Rhee JS, Ra K, Kim KT, Au DWT, Shin KH, Lee JS. Molecular cloning and expression of novel metallothionein (MT) gene in the polychaete Perinereis nuntia exposed to metals. Environ Sci Pollut Res Int 2011; 19:2606-2618. [PMID: 22828888 DOI: 10.1007/s11356-012-0905-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/06/2011] [Accepted: 03/29/2012] [Indexed: 06/01/2023]
Abstract
To report a novel metallothionein (MT) gene and evaluate its potency as a biomarker, we clone this MT gene and measured the expression levels in the metal-exposed polychaete Perinereis nuntia. Accumulated metal contents and metallothionein-like proteins (MTLPs), which have been recognized as potential biomarkers, were compared with the relative mRNA expressions of the MT gene of P. nuntia (Pn-MT). In addition, the metal-binding affinity was estimated by recombinant Pn-MT protein. Pn-MT having high cysteine residues with three metal response elements in the promoter region closely clusters with those of other invertebrates. The accumulation patterns of metals were dependent on the exposure times in lead (Pb), cadmium (Cd), and copper (Cu) exposure. Particularly, both MTLP levels and relative mRNA expressions of MT were increased with accumulated metal contents and exposure time in P. nuntia exposed to Pb and Cd. There was no significant modulation of the Pn-MT gene in polychaetes exposed to Zn and As. However, the metal-binding ability of the recombinant Pn-MT protein provides a clear evidence for a high affinity of MT to several metal elements. These results suggest that Pn-MT would play an important role in the detoxification and/or sequestration of specific metals (e.g., Pb and Cd) in P. nuntia and have potential as a molecular biomarker in the monitoring of the marine environment using a polychaete.
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Affiliation(s)
- Eun-Ji Won
- Department of Chemistry, College of Natural Sciences, Hanyang University, Seoul, 133-791, South Korea
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Shen M, Xu J, Chiang MWL, Au DWT. Unravelling the pathway of respiratory toxicity in goldlined seabream (Rhabdosargus sarba) induced by the harmful alga Chattonella marina. Aquat Toxicol 2011; 104:185-191. [PMID: 21632022 DOI: 10.1016/j.aquatox.2011.04.014] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/09/2011] [Revised: 04/13/2011] [Accepted: 04/22/2011] [Indexed: 05/30/2023]
Abstract
The harmful alga Chattonella marina has caused massive fish kills and economic losses worldwide. Suffocation is generally believed to be the major cause of fish death by C. marina. However, the specific mechanisms leading to respiratory disorder in fish and subsequent fish kills by C. marina remain unknown. The goldlined seabream, highly susceptible to C. marina, was employed to investigate temporal changes of physiological, histopathological and biochemical parameters related to respiratory function at different stages of exposure to C. marina. Hemoglobin oxidation and blood lyses were not found in goldlined seabream exposed to C. marina, which could not be the key reasons accounting for pO(2) drop in the stressed fish. Gill histopathology such as irregular organization of lamellae, mucous with algal cells trapped in interfilamental spaces, were typical in C. marina exposed fish. A surge of plasma lactate occurred in goldlined seabream shortly after exposure to C. marina (0.5h) and sustained throughout the exposure period, indicating rapid onset of and persistent anaerobic respiration in C. marina exposed fish. Depletion of plasma glucose was clearly evident in goldlined seabream showing stress symptoms and near death. Yet, fish alive in the C. marina bloom did not exhibit plasma glucose depletion. The results suggest that availability of fermentable fuel as indicated by glucose level is critical to determine fish survival in C. marina exposure. Overall, our findings have rebuked the involvement of hemolysins and/or nitric oxide as the culprits for C. marina toxicity to fish. This study is the first to demonstrate the pathway of respiratory toxicity induced by the harmful alga C. marina in fish.
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Affiliation(s)
- Min Shen
- State Key Laboratory Marine Pollution, Department of Biology and Chemistry, City University of Hong Kong, Kowloon, Hong Kong SAR, People's Republic of China
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Shen M, Xu J, Chan AKY, Au DWT. Susceptibility of fish to Chattonella marina is determined by its tolerance to hypoxia. Mar Pollut Bull 2011; 63:189-194. [PMID: 21704342 DOI: 10.1016/j.marpolbul.2011.06.001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2010] [Revised: 05/31/2011] [Accepted: 06/01/2011] [Indexed: 05/31/2023]
Abstract
The harmful alga Chattonella marina has caused massive fish kills and economic losses worldwide. However, the fish kill mechanisms by C. marina have not been identified. The present study has confirmed that a significant elevation of blood osmolality is the universal response in moribund fish exposed to C. marina and the possible reasons leading to contradictory reports were identified. Both osmotic distress and respiratory impairment are important mechanisms leading to fish kill by C. marina. The susceptibility of marine fish to C. marina appears to be inversely related to their tolerance to hypoxia, with the hypoxia intolerant goldlined seabream being the most susceptible, and the hypoxia tolerant green grouper being the most tolerant to C. marina. Further studies in the marine medaka (Oryzias melastigma) showed that fish susceptibility to C. marina is directly related to susceptibility of the fish to hypoxia, but not related to its tolerance to hypersalinity stress.
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Affiliation(s)
- Min Shen
- State Key Laboratory in Marine Pollution, Department of Biology and Chemistry, City University of Hong Kong, Kowloon, Hong Kong SAR, People's Republic of China
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Bo J, Cai L, Xu JH, Wang KJ, Au DWT. The marine medaka Oryzias melastigma--a potential marine fish model for innate immune study. Mar Pollut Bull 2011; 63:267-76. [PMID: 21683423 DOI: 10.1016/j.marpolbul.2011.05.014] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2010] [Revised: 05/13/2011] [Accepted: 05/15/2011] [Indexed: 05/25/2023]
Abstract
The objective of this study is to develop the marine medaka Oryzias melastigma as a potential marine fish model for innate immune and immunotoxicological studies. Hepcidin plays an important role in innate immune system. Two hepcidin genes (OM-hep1 and OM-hep2) were identified and characterized in the O. melastigma, which were highly conserved with other reported hepcidins. During embryogenesis, significant elevation of OM-hep1 and OM-hep2 transcripts were coincided with liver development in the embryos. In adult medaka, differential tissue expressions of both hepcidin transcripts were evident: high in liver, moderate in spleen and low in non-immune tissues. After bacterial challenge, the two hepcidin mRNAs were rapidly and remarkably induced in liver and spleen, suggesting the two OM-hepcidins in O. melastigma play a complementary role in innate defense. Gender difference in time of induction and extent of the two hepcidin mRNAs elevation in infected O. melastigma should be considered in immunotoxicological studies.
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Affiliation(s)
- Jun Bo
- State Key Laboratory in Marine Pollution and Department of Biology and Chemistry, City University of Hong Kong, Kowloon, Hong Kong SAR, PR China
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Padilla S, Cowden J, Hinton DE, Yuen B, Law S, Kullman SW, Johnson R, Hardman RC, Flynn K, Au DWT. Use of medaka in toxicity testing. ACTA ACUST UNITED AC 2011; Chapter 1:Unit1.10. [PMID: 20922755 DOI: 10.1002/0471140856.tx0110s39] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Small aquarium fishes are increasingly used as animal models, and one of these, the Japanese Medaka (Oryzias latipes), is frequently utilized for toxicity testing. While these vertebrates have many similarities with their terrestrial counterparts, there are differences that must be considered if these organisms are to be used to their highest potential. Commonly, testing may employ either the developing embryo or adults; both are easy to use and work with. To illustrate the utility and breadth of toxicity testing possible using medaka fish, we present protocols for assessing neurotoxicity in developing embryos, evaluating toxicant effects on sexual phenotype after treatment with endocrine-disrupting chemicals by sexual genotyping, and measuring hepatotoxicity in adult fish after treatment with a model hepatotoxicant. The methods run the gamut from immunohistology through PCR to basic histological techniques.
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Affiliation(s)
- Stephanie Padilla
- United States Environmental Protection Agency, Research Triangle Park, North Carolina, USA
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39
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Qiao T, Zhang X, Wu G, Au DWT. Investigation of microbial safety of a full-scale ozonation and biological activated carbon process under high humidity and temperature conditions. Water Sci Technol 2011; 64:2293-2298. [PMID: 22156135 DOI: 10.2166/wst.2011.415] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Microbial safety of a full-scale ozonation and biological activated carbon (BAC) process was investigated by examining pathogens, microbial community and particle counts, with emphasis on the BAC effluent. The process is located at South China, where the average humidity and air temperature were 70-80% and 22-24 °C, respectively. A high diversity of microbial community existed on the BAC media. Three types of dominant bacteria were identified, including Chryseobacterium indologenes, Bacillus brevis and Pseudomonas stutzeri, accounting for 90-95% of total bacteria number. As to pathogenic bacteria and viruses, an opportunistic pathogen, Bacillus cereus, was detected on the BAC. Six types of invertebrates were also observed on the medium, including rotifer, cyclops, nematode, clodecera, nauplius and blood worm. Diversity and number of invertebrates in the BAC effluent were higher than those in the BAC influent. Particle counts were generally less than 50 CNT/mL, with the maximum of 500 CNT/mL during the initial filtration stage after backwashing.
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Qiao T, Yu Z, Zhang X, Au DWT. Occurrence and fate of pharmaceuticals and personal care products in drinking water in southern China. ACTA ACUST UNITED AC 2011; 13:3097-103. [DOI: 10.1039/c1em10318k] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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41
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Fang JKH, Au DWT, Chan AKY, So LKY, Liu W, Mok HOL, Yu WY, Wu RSS, Shin PKS. Ethoxyresorufin-O-deethylase enzyme activities and accumulation of secondary/tertiary lysosomes in rabbitfish Siganus oramin as biomarkers for xenobiotic exposures. Sci Total Environ 2010; 408:4833-4840. [PMID: 20630567 DOI: 10.1016/j.scitotenv.2010.06.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/11/2010] [Revised: 06/01/2010] [Accepted: 06/04/2010] [Indexed: 05/29/2023]
Abstract
The sensitivities of using hepatic and intestinal ethoxyresorufin-O-deethylase (EROD) activities and hepatic accumulation of secondary/tertiary (2 degrees/3 degrees) lysosomes to detect xenobiotic exposures were assessed in the rabbitfish Siganus oramin in a metropolitan harbour, subtropical Hong Kong, over a complete seasonal cycle of one year. Additional information on the body-burden pollutants and physiological indices in S. oramin, and seasonal variables in seawater quality, were extracted from published data and re-analyzed. Under the influences of pollutant cocktail and seasonal factors, neither the hepatic nor intestinal EROD activity was indicative of total polycyclic aromatic hydrocarbons (Sigma PAH), total polychlorinated biphenyls, condition factor and hepatosomatic index (HSI) in S. oramin. However, the relative ratio of hepatic to intestinal EROD activities provided an indication to differentiate the xenobiotic intake route in the fish through diffusion via gills/skin or consumption of contaminated food. In addition, the elevated hepatic accumulation of 2 degrees/3 degrees lysosomes was closely associated with the dominant temporal trends of zinc and Sigma PAH, as well as reduced HSI, in S. oramin. Being minimally influenced by any investigated seasonal factors, the hepatic 2 degrees/3 degrees lysosomes in S. oramin was recommended as an effective biomarker of xenobiotic exposures and toxic effects for use in coastal pollution monitoring programmes.
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Affiliation(s)
- James K H Fang
- State Key Laboratory in Marine Pollution and Department of Biology and Chemistry, City University of Hong Kong, Kowloon, Hong Kong
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42
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Lam C, Neumann R, Shin PKS, Au DWT, Qian PY, Wu RSS. Polybrominated diphenylethers (PBDEs) alter larval settlement of marine benthic polychaetes. Environ Sci Technol 2010; 44:7130-7137. [PMID: 20726517 DOI: 10.1021/es1012615] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Polybrominated diphenylethers (PBDEs) are found ubiquitously in marine environments worldwide. Sediment is the major sink of PBDEs, with the congener BDE 47 being most abundant. In this study, laboratory experiments were carried out to test the hypothesis that contamination of BDE 47 at environmentally realistic sediment concentrations can alter polychaete larval settlement. Using multiple-choice experiment, settlement of three polychaete species (Pseudopolydora vexillosa, Polydora cornuta, and Capitella sp. I) on four types of spiked sediment was studied and compared: (i) low BDE 47 concentration (0.5 ng g(-1) dry weight); (ii) high BDE 47 concentration (3.0 ng g(-1) dry weight), (iii) hexane (solvent control), and (iv) natural sediment (control). Our results showed that settlement of P. vexillosa and Capitella sp. I larvae was significantly promoted, while settlement of P. cornuta reduced, at high BDE 47 concentration in sediment compared with the respective controls under both short- (24 h) and long-term (4 week) exposures. After 4 weeks, body burden of BDE 47 in all polychaete species was directly related to the spike concentration, and body length of settled juveniles of P. vexillosa and Capitella sp. I at the high-concentration treatment was significantly longer compared with that of other treatments and controls. For the first time, we demonstrated that environmentally realistic concentrations of BDE 47 in sediment can affect polychaete settlement in species-specific and dose-dependent manners. Given the global contamination of PBDE in marine sediment, BDE 47 may potentially alter the settlement pattern of marine polychaetes and hence their benthic composition over large areas.
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Affiliation(s)
- Cindy Lam
- Centre for Marine Environmental Research and Innovative Technology, City University of Hong Kong, Tat Chee Avenue, Kowloon Tong, Hong Kong SAR, China
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Shen M, Xu J, Tsang TY, Au DWT. Toxicity comparison between Chattonella marina and Karenia brevis using marine medaka (Oryzias melastigma): Evidence against the suspected ichthyotoxins of Chattonella marina. Chemosphere 2010; 80:585-91. [PMID: 20444485 DOI: 10.1016/j.chemosphere.2010.03.051] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2010] [Revised: 03/20/2010] [Accepted: 03/29/2010] [Indexed: 05/25/2023]
Abstract
The marine alga Chattonella marina is often associated with massive fish mortality worldwide. Here, we challenge brevetoxins and free fatty acids as the ichthyotoxins of C. marina by comparing the toxicity of C. marina with a brevetoxins-producing alga Karenia brevis as well as their organic solvent extracts using the seawater medaka Oryzias melastigma. Opposite to K. brevis, toxicity of C. marina was highly correlated with its growth rate and exhibited no dose response relationship between cell density and fish mortality. Fish exposed to C. marina developed significant hyperventilation response, but K. brevis induced hypoventilation response in medaka. Moreover, the organic extracts from C. marina showed no toxicity to fish whereas organic extracts from K. brevis showed significantly higher toxicity than the whole K. brevis culture. The toxins produced by C. marina may be protein in nature or small and labile molecular compounds which are not able to be extracted by traditional organic extraction methods.
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Affiliation(s)
- Min Shen
- Department of Biology and Chemistry, City University of Hong Kong, Kowloon, People's Republic of China
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Yuen JWM, Gohel MDI, Poon NW, Shum DKY, Tam PC, Au DWT. The initial and subsequent inflammatory events during calcium oxalate lithiasis. Clin Chim Acta 2010; 411:1018-26. [PMID: 20347754 DOI: 10.1016/j.cca.2010.03.015] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2009] [Revised: 03/11/2010] [Accepted: 03/12/2010] [Indexed: 10/19/2022]
Abstract
BACKGROUND Crystallization is believed to be the initiation step of urolithiasis, even though it is unknown where inside the nephron the first crystal nucleation occurs. METHODS Direct nucleation of calcium oxalate and subsequent events including crystal retention, cellular damage, endocytosis, and hyaluronan (HA) expression, were tested in a two-compartment culture system with intact human proximal tubular HK-2 cell monolayer. RESULTS Calcium oxalate dihydrate (COD) was nucleated and bound onto the apical surface of the HK-2 cells under hypercalciuric and hyperoxaluric conditions. These cells displayed mild cellular damage and internalized some of the adhered crystals within 18h post-COD-exposure, as revealed by electron microscopy. Prolonged incubation in complete medium caused significant damage to disrupt the monolayer integrity. Furthermore, hyaluronan disaccharides were detected in the harvested media, and were associated with HAS-3 mRNA expression. CONCLUSION Human proximal cells were able to internalize COD crystals which nucleated directly onto the apical surface, subsequently triggering cellular damage and HAS-3 specific hyaluronan synthesis as an inflammatory response. The proximal tubule cells here demonstrate that it plays an important role in facilitating urolithiasis via endocytosis and creating an inflammatory environment whereby free hyaluronan in tubular fluid can act as crystal-binding molecule at the later segments of distal and collecting tubules.
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Affiliation(s)
- John W M Yuen
- Department of Health Technology & Informatics, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong
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Wang HH, Wang YXJ, Leung KCF, Au DWT, Xuan S, Chak CP, Lee SKM, Sheng H, Zhang G, Qin L, Griffith JF, Ahuja AT. Durable mesenchymal stem cell labelling by using polyhedral superparamagnetic iron oxide nanoparticles. Chemistry 2010; 15:12417-25. [PMID: 19834937 DOI: 10.1002/chem.200901548] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Small polyhedral superparamagnetic iron oxide (SPIO) nanoparticles (<10 nm) coated with a thin layer of silica were prepared (SPIO@SiO(2) and SPIO@SiO(2)-NH(2)). Surface modification of the small polyhedral silica-coated SPIO nanoparticles with amines led to substantially higher mesenchymal stem cell (MSC) labelling efficiency without the use of additional transfecting agents. Therefore, amine surface-modified nanoparticles (SPIO@ SiO(2)-NH(2)) appeared to be the preferred candidate for MSC labelling. In vitro studies demonstrated that controlled labelling of SPIO@SiO(2) and SPIO@SiO(2)-NH(2) did not cause MSC death or proliferation inhibition. MSCs labelled with SPIO@SiO(2)-NH(2) nanoparticles retained differentiation potential and showed osteogenic, adipogenic and chondrogenic differentiations. The noncytotoxic polyhedral SPIO@SiO(2)-NH(2) nanoparticle-labelled MSCs were successfully implanted in rabbit brain and erector spinae muscle, and demonstrated long-lasting, durable MRI labelling efficacy after 8-12 weeks.
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Affiliation(s)
- Hao-Hao Wang
- Department of Diagnostic Radiology and Organ Imaging, Prince of Wales Hospital, The Chinese University of Hong Kong, Shatin, NT, Hong Kong SAR, China
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Tao Y, Zhang X, Au DWT, Mao X, Yuan K. The effects of sub-lethal UV-C irradiation on growth and cell integrity of cyanobacteria and green algae. Chemosphere 2010; 78:541-547. [PMID: 20005556 DOI: 10.1016/j.chemosphere.2009.11.016] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/10/2009] [Revised: 11/11/2009] [Accepted: 11/12/2009] [Indexed: 05/28/2023]
Abstract
The effects of UV-C irradiation on algal growth and cell integrity were investigated to develop a potential method for preventing cyanobacterial blooms. The toxic cyanobacterium Microcystis aeruginosa and three common freshwater green algae Chlorella ellipsoidea, Chlorella vulgaris, and Scenedesmus quadricanda were exposed to UV-C irradiation at 0-200mJcm(-2) and subsequently incubated for 9-15 d under normal culture conditions. Cell density and cell integrity were assessed using flow cytometry. The results suggested that UV-C irradiation at 20-200mJcm(-2) can suppress M. aeruginosa growth for 3-13 d in a dose-dependent manner. UV-C irradiation at 20 and 50mJcm(-2) is sub-lethal to M. aeruginosa cells as over 80% of the exposed cells remained intact. However, UV-C irradiation at 100 and 200mJcm(-2) induced severe cell disintegration in more than 70% of the irradiated cells. Neither significant suppression nor disintegration effects on green algae were observed for UV-C irradiation at 20-200mJcm(-2) in this study. Taken together, the sensitivity of M. aeruginosa to UV-C irradiation was significantly higher than that of the non-toxic C. ellipsoidea, C. vulgaris, and S. quadricauda, suggesting the potential application of sub-lethal UV-C irradiation for M. aeruginosa bloom control with a predictable low ecological risk.
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Affiliation(s)
- Yi Tao
- Research Center for Environmental Engineering and Management, Tsinghua University, Shenzhen, China
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47
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Park JW, Tompsett AR, Zhang X, Newsted JL, Jones PD, Au DWT, Kong R, Wu RSS, Giesy JP, Hecker M. Advanced fluorescence in situ hybridization to localize and quantify gene expression in Japanese medaka (Oryzias latipes) exposed to endocrine-disrupting compounds. Environ Toxicol Chem 2009; 28:1951-1962. [PMID: 19469586 DOI: 10.1897/08-574.1] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/10/2008] [Accepted: 04/13/2009] [Indexed: 05/27/2023]
Abstract
In an earlier study, we described the development of fluorescence in situ hybridization (FISH) using confocal microscopy to localize and quantify gene expression in fish. Here, we report the results of FISH application to investigate effects of model endocrine-disrupting chemicals (EDCs), 17alpha-ethinylestradiol (EE2) and 17beta-trenbolone (TB), on expressions of EDC-responsive genes in Japanese medaka (Oryzias latipes) at the cellular/tissue level paired with histological observation. Gene expressions of vitellogenin-II (Vit-II), androgen receptor (AR), and cytochrome P450 gonadal aromatase (CYP19a) were determined after exposure to 5, 50, or 500 ng/L of EE2 or 50, 500, or 5,000 ng/L of TB for 7 d. Exposure to the greatest concentration of EE2 or TB significantly reduced fecundity and caused histological alterations in gonads. 17alpha-Ethinylestradiol induced Vit-II expression in both male gonads and liver relative to controls and resulted in greater intensity of hematoxylin staining in hepatocytes, which was significantly correlated with Vit-II induction in liver. When exposed to EE2 at less than 50 ng/L, CYP19a expression associated with early stage oocytes was greater than that in controls. However, at 500 ng/L, this trend was reversed. The greater Vit-II expression in testis from all EE2 groups, and the lesser expression of CYP19a in ovaries from the 500 ng/L group, likely is related to changes in the number of cells in which these genes are predominantly expressed rather than to an increase in expression per cell. 17beta-Trenbolone significantly induced AR expression in ovaries but did not alter AR expression in female liver. It was concluded that FISH combined with histology enables advanced elucidation of molecular effects of chemicals by associating changes in gene expression with certain tissues and/or cell types and allows these changes to be related to histological effects.
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Affiliation(s)
- June-Woo Park
- Department of Zoology, National Food Safety and Toxicology Center, Michigan State University, East Lansing, Michigan 48824, USA.
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Fang JKH, Au DWT, Wu RSS, Chan AKY, Mok HOL, Shin PKS. The use of physiological indices in rabbitfish Siganus oramin for monitoring of coastal pollution. Mar Pollut Bull 2009; 58:1229-1235. [PMID: 19527910 DOI: 10.1016/j.marpolbul.2009.05.013] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/22/2009] [Revised: 05/13/2009] [Accepted: 05/13/2009] [Indexed: 05/27/2023]
Affiliation(s)
- J K H Fang
- Centre for Coastal Pollution and Conservation, Department of Biology and Chemistry, City University of Hong Kong, 83, Tat Chee Avenue, Kowloon, Hong Kong
| | - D W T Au
- Centre for Coastal Pollution and Conservation, Department of Biology and Chemistry, City University of Hong Kong, 83, Tat Chee Avenue, Kowloon, Hong Kong
| | - R S S Wu
- Centre for Coastal Pollution and Conservation, Department of Biology and Chemistry, City University of Hong Kong, 83, Tat Chee Avenue, Kowloon, Hong Kong
| | - A K Y Chan
- Centre for Coastal Pollution and Conservation, Department of Biology and Chemistry, City University of Hong Kong, 83, Tat Chee Avenue, Kowloon, Hong Kong
| | - H O L Mok
- Centre for Coastal Pollution and Conservation, Department of Biology and Chemistry, City University of Hong Kong, 83, Tat Chee Avenue, Kowloon, Hong Kong
| | - P K S Shin
- Centre for Coastal Pollution and Conservation, Department of Biology and Chemistry, City University of Hong Kong, 83, Tat Chee Avenue, Kowloon, Hong Kong.
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Fang JKH, Wu RSS, Zheng GJ, Au DWT, Lam PKS, Shin PKS. The use of muscle burden in rabbitfish Siganus oramin for monitoring polycyclic aromatic hydrocarbons and polychlorinated biphenyls in Victoria Harbour, Hong Kong and potential human health risk. Sci Total Environ 2009; 407:4327-4332. [PMID: 19406454 DOI: 10.1016/j.scitotenv.2009.03.033] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/17/2009] [Revised: 03/30/2009] [Accepted: 03/31/2009] [Indexed: 05/27/2023]
Abstract
Muscle concentrations of polycyclic aromatic hydrocarbons (PAHs) and polychlorinated biphenyls (PCBs) were determined in rabbitfish Siganus oramin collected from Victoria Harbour and its vicinity, Hong Kong from 2004 to 2007. Spatially, relatively higher levels of [summation operator]PAH (1.05-4.26 microg g(-1)) and [summation operator]PCB (45.1-76.9 ng g(-1)) were determined in the central and western sites inside the harbour. Temporally, upward trend of [summation operator]PAH, accompanied with a proportion shift from high molecular weight to low molecular weight PAHs, was detected during the three-year study period, suggesting a heavier marine traffic in Victoria Harbour and its western region. However, human health risk assessment based on five individual PAHs indicated that PAHs in fish muscles posed minimal health risk through consumption. In contrast, a downward trend of [summation operator]PCB was registered as the open use of PCBs has been banned. Despite this, the level of [summation operator]PCB in fish muscles still posed a health risk on the local people who have a high fish consumption rate. While seasonal influences on [summation operator]PAH/[summation operator]PCB accumulation in S. oramin seemed to be negligible, our findings in S. oramin were in line with the established PAH and PCB levels in sediments and/or mussels from the harbour, suggesting S. oramin can be used as a model fish species for monitoring PAHs and PCBs in the region.
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Affiliation(s)
- James K H Fang
- Centre for Coastal Pollution and Conservation, Department of Biology and Chemistry, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong
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Tompsett AR, Park JW, Zhang X, Jones PD, Newsted JL, Au DWT, Chen EXH, Yu R, Wu RSS, Kong RYC, Giesy JP, Hecker M. In situ hybridization to detect spatial gene expression in medaka. Ecotoxicol Environ Saf 2009; 72:1257-1264. [PMID: 19147229 DOI: 10.1016/j.ecoenv.2008.10.013] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2008] [Revised: 10/16/2008] [Accepted: 10/31/2008] [Indexed: 05/27/2023]
Abstract
A whole-animal tissue section in situ hybridization (ISH) system with radio-labeled probes was developed to detect differential gene expression among tissues of the small, oviparous teleost fish, Japanese medaka (Oryzias latipes). Because of its tissue- and gender-specific expression, gonadal aromatase (CYP19a) was selected as a model gene to demonstrate the potential of the system. The ISH system was validated with a 7d exposure to the model aromatase inhibitor, fadrozole. Fadrozole did not affect the magnitude of gene expression in testes, but significantly up-regulated CYP19a gene expression in ovaries. These results were confirmed with quantitative real-time-polymerase chain reaction (RT-PCR). Histological evaluation revealed that females exposed to 100microg/L fadrozole lacked mature oocytes. Male gonadal morphology was normal in all treatments. The ISH method developed in this study allowed tissue-specific resolution of gene expression in a whole animal model, as well as the ability to analyze cellular morphological detail in the same organism.
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Affiliation(s)
- A R Tompsett
- Department of Zoology, Center for Integrative Toxicology, Michigan State University, East Lansing, MI, USA.
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