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Tessele I, Dal Molin TR, Dognini J, Noremberg S, de Carvalho LM. Investigation of thallium as a contaminant in dietary supplements marketed for weight loss and physical fitness. Food Addit Contam Part A Chem Anal Control Expo Risk Assess 2024; 41:800-810. [PMID: 38781478 DOI: 10.1080/19440049.2024.2354494] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2024] [Accepted: 05/07/2024] [Indexed: 05/25/2024]
Abstract
Dietary supplements are drastically growing as a category of consumer products all over the world. The abuse of supplements marketed for slimming purposes and physical fitness has been observed worldwide in recent years, which raises concerns in terms of public health. In this study, different types of dietary supplements marketed and delivered through the e-commerce were studied for the determination of thallium as a hazardous inorganic contaminant. The total content of thallium was determined by a sensitive voltammetric method after a microwave-assisted oxidative digestion of the sample. In addition, a comparative spectrometric method was applied for validation of the results in the samples. The maximum concentration found for thallium was found to be 2.89 mg kg-1, which well agree with the comparative measurement. Considering the 32 studied formulations, it can be pointed out that ∼24% of the of dietary supplements presented Tl concentrations at concentrations higher than 1 mg kg-1. The results permitted the assessment of the health risk related to thallium from contaminated samples, based on the calculation of the estimated daily intake (EDI) and the risk quotient (HQ). The highest daily intake of thallium was calculated as 82.0 µg day-1 in a protein-based supplement, which is equivalent to an EDI of 1.17 µg kg-1 day-1. This work highlights the need to develop regulations on the limits of toxic elements such as thallium in widely consumed dietary supplements, as well as an in-depth look at the adverse effects caused by this element in the human body.
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Affiliation(s)
- Igor Tessele
- Department of Chemistry, Federal University of Santa Maria (UFSM), Santa Maria, Brazil
| | - Thaís R Dal Molin
- Graduate Program of Pharmaceutical Sciences, Federal University of Santa Maria (UFSM), Santa Maria, Brazil
| | | | - Simone Noremberg
- Department of Chemistry, Federal University of Santa Maria (UFSM), Santa Maria, Brazil
| | - Leandro M de Carvalho
- Department of Chemistry, Federal University of Santa Maria (UFSM), Santa Maria, Brazil
- Graduate Program of Pharmaceutical Sciences, Federal University of Santa Maria (UFSM), Santa Maria, Brazil
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2
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Li Y, Pan Y, Wang K, Ding Y, Li Z, Lu M, Xu D. Association of urinary thallium with hypertension in children and adolescents aged 8-17 years: NHANES 2005-2018. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:102927-102935. [PMID: 37676453 DOI: 10.1007/s11356-023-29683-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2023] [Accepted: 08/30/2023] [Indexed: 09/08/2023]
Abstract
Hypertension is a key risk factor for cardiovascular disease (CVD). Thallium is a highly toxic metal that exists in all aspects of our lives and can cause damage to human health. The aim of this study was to identify the potential correlation between urinary thallium (U-Tl) and hypertension in American youth aged 8-17 years. The National Health and Nutritional Examination Survey (NHANES) database was mined for cross-sectional information on 2295 American children and adolescents aged 8-17 years. Inductively coupled plasma mass spectrometry (ICP-MS) was utilized to measure U-Tl levels, and the results were categorized into four quartiles (Q1-Q4). Logistic generalized linear models and unweighted restricted cubic spline (RCS) regression were used to investigate the relationship between U-Tl and hypertension. After adjusting for covariates, the odds ratios (ORs) at 95% confidence intervals (CIs) for hypertension prevalence in the 2nd, 3rd, and 4th quartiles were 0.43 (0.22-0.81), 0.54 (0.29-0.99), and 0.43 (0.22-0.81), when compared to the lowest quartile (P for trend = 0.024). RCS plot showed a negative linear correlation between log2-transformed U-Tl levels and hypertension (P for non-linearity = 0.869). Subgroup analysis based on sex indicated a statistically significant link between U-Tl and hypertension in male (P < 0.05). There is a negative linear relationship between U-Tl and hypertension in American children and adolescents aged 8-17 years with low thallium exposure. Due to the nature of cross-sectional studies, further studies are necessary to validate our conclusions and elucidate possible mechanisms.
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Affiliation(s)
- Yansong Li
- Department of Geriatrics, The First Affiliated Hospital of Nanjing Medical University, No. 300 Guangzhou Road, Nanjing, 210029, Jiangsu, China
| | - Yiting Pan
- Department of Geriatrics, The First Affiliated Hospital of Nanjing Medical University, No. 300 Guangzhou Road, Nanjing, 210029, Jiangsu, China
| | - Kai Wang
- Department of Geriatrics, The First Affiliated Hospital of Nanjing Medical University, No. 300 Guangzhou Road, Nanjing, 210029, Jiangsu, China
| | - Yinzhang Ding
- Department of Cardiology, The First Affiliated Hospital of Nanjing Medical University, No. 300 Guangzhou Road, Nanjing, 210029, Jiangsu, China
| | - Zhongming Li
- Department of Geriatrics, The First Affiliated Hospital of Nanjing Medical University, No. 300 Guangzhou Road, Nanjing, 210029, Jiangsu, China
| | - Miao Lu
- Department of Geriatrics, The First Affiliated Hospital of Nanjing Medical University, No. 300 Guangzhou Road, Nanjing, 210029, Jiangsu, China
| | - Di Xu
- Department of Geriatrics, The First Affiliated Hospital of Nanjing Medical University, No. 300 Guangzhou Road, Nanjing, 210029, Jiangsu, China.
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Li J, Xia Y, Xu H, Xiong R, Zhao Y, Li P, Yang T, Huang Q, Shan F. Activation of brain lactate receptor GPR81 aggravates exercise-induced central fatigue. Am J Physiol Regul Integr Comp Physiol 2022; 323:R822-R831. [PMID: 36189986 DOI: 10.1152/ajpregu.00094.2022] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2022] [Revised: 09/22/2022] [Accepted: 09/22/2022] [Indexed: 11/22/2022]
Abstract
Exercise-induced fatigue is a complex physiological phenomenon and is greatly influenced by central mechanisms in brain. As one of the most abundant circulating carbon metabolites, l-lactate in brain has been considered to be an important supplementary fuel during exercise; however, whether it plays a signaling role in fatigue remains largely obscure. In this study, our results initially revealed that brain l-lactate levels were increased after an exhaustive swimming session in several brain regions including motor cortex, hippocampus, and cerebellum. Then, we examined the specific role of brain lactate receptor, also known as hydroxycarboxylic acid receptor 1 (GPR81), in exercise-induced fatigue. We found that intracerebroventricular injection of either d-lactate (an enantiomer that could mediate activation of GPR81 as l-lactate) or a potent GPR81 agonist 3-chloro-5-hydroxybenzoic acid (CHBA), significantly decreased the swimming time to fatigue. After being subjected to the same weight-loaded swimming for 30 min, no obvious changes of blood lactate levels, gastrocnemius pAMPK/AMPK ratio, and glycogen contents were observed between intracerebroventricular CHBA-injected mice and vehicle-treated ones, which suggested a comparable degree of peripheral fatigue. Meanwhile, there were higher extracellular γ-aminobutyric acid (GABA) levels and lower extracellular glutamate levels and glutamate/GABA ratio in motor cortex of the intracerebroventricular CHBA-injected mice than that of vehicle-treated ones, indicating a greater extent of central fatigue in CHBA-injected mice than that in vehicle animals. Collectively, our results suggested that an increased level of brain l-lactate acts as a signaling molecule via activating GPR81, which in turn exacerbates central fatigue during exercise.
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Affiliation(s)
- Junxia Li
- State Key Laboratory of Trauma, Burns and Combined Injury, Department of Traumatic Shock and Transfusion, Research Institute of Surgery, Daping Hospital, Army Medical University, Chongqing, China
| | - Yiming Xia
- State Key Laboratory of Trauma, Burns and Combined Injury, Department of Army Occupational Disease, Research Institute of Surgery, Daping Hospital, Army Medical University, Chongqing, China
| | - Honghao Xu
- State Key Laboratory of Trauma, Burns and Combined Injury, Department of Army Occupational Disease, Research Institute of Surgery, Daping Hospital, Army Medical University, Chongqing, China
- Department of Medicine, Hubei Minzu University, Enshi, China
| | - Renping Xiong
- State Key Laboratory of Trauma, Burns and Combined Injury, Department of Army Occupational Disease, Research Institute of Surgery, Daping Hospital, Army Medical University, Chongqing, China
| | - Yan Zhao
- State Key Laboratory of Trauma, Burns and Combined Injury, Department of Army Occupational Disease, Research Institute of Surgery, Daping Hospital, Army Medical University, Chongqing, China
| | - Ping Li
- State Key Laboratory of Trauma, Burns and Combined Injury, Department of Army Occupational Disease, Research Institute of Surgery, Daping Hospital, Army Medical University, Chongqing, China
| | - Tian Yang
- Department of Cold Environmental Medicine, College of High Altitude Military Medicine, Army Medical University, Chongqing, China
| | - Qingyuan Huang
- Department of Cold Environmental Medicine, College of High Altitude Military Medicine, Army Medical University, Chongqing, China
| | - Fabo Shan
- State Key Laboratory of Trauma, Burns and Combined Injury, Department of Army Occupational Disease, Research Institute of Surgery, Daping Hospital, Army Medical University, Chongqing, China
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Colombaioni L, Campanella B, Nieri R, Onor M, Benedetti E, Bramanti E. Time-dependent influence of high glucose environment on the metabolism of neuronal immortalized cells. Anal Biochem 2022; 645:114607. [DOI: 10.1016/j.ab.2022.114607] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2021] [Revised: 02/07/2022] [Accepted: 02/17/2022] [Indexed: 11/16/2022]
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Campanella B, Colombaioni L, Nieri R, Benedetti E, Onor M, Bramanti E. Unraveling the Extracellular Metabolism of Immortalized Hippocampal Neurons Under Normal Growth Conditions. Front Chem 2021; 9:621548. [PMID: 33937186 PMCID: PMC8085660 DOI: 10.3389/fchem.2021.621548] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2020] [Accepted: 02/16/2021] [Indexed: 01/17/2023] Open
Abstract
Metabolomic profiling of cell lines has shown many potential applications and advantages compared to animal models and human subjects, and an accurate cellular metabolite analysis is critical to understanding both the intracellular and extracellular environments in cell culture. This study provides a fast protocol to investigate in vitro metabolites of immortalized hippocampal neurons HN9.10e with minimal perturbation of the cell system using a targeted approach. HN9.10e neurons represent a reliable model of one of the most vulnerable regions of the central nervous system. Here, the assessment of their extracellular metabolic profile was performed by studying the cell culture medium before and after cell growth under standard conditions. The targeted analysis was performed by a direct, easy, high-throughput reversed-phase liquid chromatography with diode array detector (RP-HPLC-DAD) method and by headspace solid-phase microextraction-gas chromatography-mass spectrometry (HS-SPME-GC-MS) for the study of volatile organic compounds (VOCs). The analysis of six different batches of cells has allowed to investigate the metabolic reproducibility of neuronal cells and to describe the metabolic "starting" conditions that are mandatory for a well-grounded interpretation of the results of any following cellular treatment. An accurate study of the metabolic profile of the HN9.10e cell line has never been performed before, and it could represent a quality parameter before any other targeting assay or further exploration.
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Affiliation(s)
- Beatrice Campanella
- National Research Council, Institute of Chemistry of Organometallic Compounds (CNR-ICCOM), Pisa, Italy
| | - Laura Colombaioni
- National Research Council, Institute of Neuroscience (CNR-IN), Pisa, Italy
| | - Riccardo Nieri
- National Research Council, Institute of Chemistry of Organometallic Compounds (CNR-ICCOM), Pisa, Italy
| | - Edoardo Benedetti
- Hematology Unit, Department of Oncology, University of Pisa, Pisa, Italy
| | - Massimo Onor
- National Research Council, Institute of Chemistry of Organometallic Compounds (CNR-ICCOM), Pisa, Italy
| | - Emilia Bramanti
- National Research Council, Institute of Chemistry of Organometallic Compounds (CNR-ICCOM), Pisa, Italy
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6
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Tong J, Liang CM, Huang K, Xiang HY, Qi J, Feng LL, Lai YP, Shao SS, Wu XY, Tao FB. Prenatal serum thallium exposure and 36-month-old children's attention-deficit/hyperactivity disorder symptoms: Ma'anshan birth cohort study. CHEMOSPHERE 2020; 244:125499. [PMID: 32050328 DOI: 10.1016/j.chemosphere.2019.125499] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/12/2019] [Revised: 11/25/2019] [Accepted: 11/26/2019] [Indexed: 06/10/2023]
Abstract
Thallium (Tl) is a highly toxic heavy metal that has been suggested to be responsible for oxidative stress and mitochondrial dysfunction. However, few studies have focused on the relationship of prenatal Tl exposure with children's neurobehavioural development. The purpose of our study was to investigate the association between prenatal Tl exposure and attention-deficit/hyperactivity disorder (ADHD) symptoms in 36-month-old children. We used data from 2851 mother-newborn pairs from the Ma'anshan Birth Cohort Study (MABC); serum Tl concentration was assessed in the first, second and third trimesters of pregnancy as well as in the umbilical cord blood. We assessed ADHD symptoms in the children using the Chinese version of the Conners abbreviated symptom questionnaire (C-ASQ). The adjusted odds ratio (OR) for the risk of ADHD symptoms was 2.00 [95% confidence interval (CI): 1.20, 3.32] and 2.08 (95% CI: 1.26, 3.43) for the third (60.25-75.21 ng/L) and fourth quartiles of serum Tl (>75.21 ng/L), respectively, in the second trimester of pregnancy, in comparison with the first quartile of serum Tl (<50.86 ng/L). The risk of ADHD symptoms was elevated among boys exposed to the fourth quartile of serum Tl in the second trimester of pregnancy (adjusted OR 2.08, 95% CI: 1.13, 3.83). Our results demonstrated that high levels of Tl exposure in the second trimester of pregnancy were related to a higher risk of ADHD symptoms in 36-month-old children, and the association of higher serum Tl exposure in the second trimester with ADHD symptoms was only found in boys.
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Affiliation(s)
- Juan Tong
- Department of Maternal, Child and Adolescent Health, Anhui Medical University, Hefei, Anhui, People's Republic of China
| | - Chun-Mei Liang
- Department of Maternal, Child and Adolescent Health, Anhui Medical University, Hefei, Anhui, People's Republic of China; Anhui Provincial Key Laboratory of Population Health & Aristogenics, Hefei, Anhui, People's Republic of China
| | - Kung Huang
- Department of Maternal, Child and Adolescent Health, Anhui Medical University, Hefei, Anhui, People's Republic of China; Anhui Provincial Key Laboratory of Population Health & Aristogenics, Hefei, Anhui, People's Republic of China
| | - Hai-Yun Xiang
- Department of Maternal, Child and Adolescent Health, Anhui Medical University, Hefei, Anhui, People's Republic of China
| | - Juan Qi
- Department of Maternal, Child and Adolescent Health, Anhui Medical University, Hefei, Anhui, People's Republic of China
| | - Lan-Lan Feng
- Department of Maternal, Child and Adolescent Health, Anhui Medical University, Hefei, Anhui, People's Republic of China
| | - Ya-Ping Lai
- Department of Maternal, Child and Adolescent Health, Anhui Medical University, Hefei, Anhui, People's Republic of China
| | - Shan-Shan Shao
- Department of Maternal, Child and Adolescent Health, Anhui Medical University, Hefei, Anhui, People's Republic of China; Anhui Provincial Key Laboratory of Population Health & Aristogenics, Hefei, Anhui, People's Republic of China
| | - Xiao-Yan Wu
- Department of Maternal, Child and Adolescent Health, Anhui Medical University, Hefei, Anhui, People's Republic of China; Anhui Provincial Key Laboratory of Population Health & Aristogenics, Hefei, Anhui, People's Republic of China
| | - Fang-Biao Tao
- Department of Maternal, Child and Adolescent Health, Anhui Medical University, Hefei, Anhui, People's Republic of China; Anhui Provincial Key Laboratory of Population Health & Aristogenics, Hefei, Anhui, People's Republic of China.
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Campanella B, Colombaioni L, Benedetti E, Di Ciaula A, Ghezzi L, Onor M, D’Orazio M, Giannecchini R, Petrini R, Bramanti E. Toxicity of Thallium at Low Doses: A Review. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2019; 16:ijerph16234732. [PMID: 31783498 PMCID: PMC6926957 DOI: 10.3390/ijerph16234732] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 10/25/2019] [Revised: 11/19/2019] [Accepted: 11/23/2019] [Indexed: 02/07/2023]
Abstract
A mini review of the toxicity of Thallium (Tl) at low doses is herein presented. Thallium has severe toxicity. Although its acute biological effects have been widely investigated and are well known, its biological effects on human health and in cell cultures at low doses (<100 μg/L) due, for example, to Tl chronic exposure via consumption of contaminated water or foods, have often been overlooked or underestimated. Relatively few papers have been published on this topic and are herein reviewed to provide a focused scientific opinion in the light of current worldwide regulatory issues.
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Affiliation(s)
- Beatrice Campanella
- National Research Council of Italy, C.N.R., Institute of Chemistry of Organo Metallic Compounds-ICCOM, 56124 Pisa, Italy; (B.C.); (M.O.)
| | - Laura Colombaioni
- CNR Neuroscience Institute, Area della Ricerca CNR, 56124 Pisa, Italy;
| | - Edoardo Benedetti
- Hematology Unit, Department of Oncology, University of Pisa, 56126 Pisa, Italy;
| | - Agostino Di Ciaula
- International Society of Doctors for Environment (ISDE), 52100 Arezzo, Italy;
| | - Lisa Ghezzi
- Department of Earth Sciences, University of Pisa, 56126 Pisa, Italy; (L.G.); (M.D.); (R.G.); (R.P.)
| | - Massimo Onor
- National Research Council of Italy, C.N.R., Institute of Chemistry of Organo Metallic Compounds-ICCOM, 56124 Pisa, Italy; (B.C.); (M.O.)
| | - Massimo D’Orazio
- Department of Earth Sciences, University of Pisa, 56126 Pisa, Italy; (L.G.); (M.D.); (R.G.); (R.P.)
| | - Roberto Giannecchini
- Department of Earth Sciences, University of Pisa, 56126 Pisa, Italy; (L.G.); (M.D.); (R.G.); (R.P.)
| | - Riccardo Petrini
- Department of Earth Sciences, University of Pisa, 56126 Pisa, Italy; (L.G.); (M.D.); (R.G.); (R.P.)
| | - Emilia Bramanti
- National Research Council of Italy, C.N.R., Institute of Chemistry of Organo Metallic Compounds-ICCOM, 56124 Pisa, Italy; (B.C.); (M.O.)
- Correspondence:
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Ghezzi L, Iaccarino S, Carosi R, Montomoli C, Simonetti M, Paudyal KR, Cidu R, Petrini R. Water quality and solute sources in the Marsyangdi River system of Higher Himalayan range (West-Central Nepal). THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 677:580-589. [PMID: 31067479 DOI: 10.1016/j.scitotenv.2019.04.363] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/16/2019] [Revised: 03/28/2019] [Accepted: 04/24/2019] [Indexed: 06/09/2023]
Abstract
Surface waters, cold and hot springs were collected in different catchments along the Marsyangdi basin, in the Himalayan Range of West-Central Nepal, during the post-monsoon season in 2017 and analyzed for major ions and trace elements, with the aim of assessing the sources of dissolved species and to contribute in watershed planning. The major element data indicate that surface waters coming from the Tethyan Himalayan Sequence (THS) range from the Ca-Mg-HCO3 to the Ca-Mg-HCO3-SO4 water-types and reflect a two-component mixing of waters from carbonate- and sulfate-bearing sources. The latter component is attributable to sulfide oxidation with minor silicate weathering. In the Greater Himalaya Sequence (GHS), alteration of pedogenetic carbonates formed in response to silicate weathering under a variable CO2 gas pressure dominates, yielding a Ca-HCO3 signature. The stability diagram in the K2O-Al2O3-SiO2-H2O system and the paired increases in Ca2+, Na+, K+ and silica indicate that degradation of silicate minerals through kaolinization and possibly plagioclase albitization reactions is the main process for hot groundwater. Cold and hot springs define a trend of increasing Li, SiO2 and Cl-, suggesting that lithium was leached from silica-rich sources, such as pegmatite dykes and sills occurring in host rocks, and concentrated into halite-bearing salt aquifers. In hot waters Sb, As and Tl exceed the EU and USEPA thresholds. Tl is usually incorporated into pyrite and correlates with Li indicating the occurrence of an ore-bearing zone possibly related to hydrothermal activity at the transition zone between THS and GHS, as suggested by the relatively high Ba, Ni, Cu, Sb, As and Mn contents. The obtained data on water quality have significant implications for people living along the Upper Marsyangdi River in the management of water resources, especially in terms of the enhancement of cold water aquaculture and hot water uses for recreation purposes and tourism.
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Affiliation(s)
- Lisa Ghezzi
- Università di Pisa, Dipartimento di Scienze della Terra, via S. Maria 53, 56126 Pisa, Italy
| | - Salvatore Iaccarino
- Università di Torino, Dipartimento di Scienze della Terra, via Valperga Caluso 35, 10125 Torino, Italy
| | - Rodolfo Carosi
- Università di Torino, Dipartimento di Scienze della Terra, via Valperga Caluso 35, 10125 Torino, Italy
| | - Chiara Montomoli
- Università di Torino, Dipartimento di Scienze della Terra, via Valperga Caluso 35, 10125 Torino, Italy; CNR-IGG, via Moruzzi 1, 56124 Pisa, Italy
| | - Matteo Simonetti
- Università di Torino, Dipartimento di Scienze della Terra, via Valperga Caluso 35, 10125 Torino, Italy
| | - Kabi R Paudyal
- Tribhuvan University, Central Department of Geology, Kirtipur, Kathmandu, Nepal
| | - Rosa Cidu
- Università di Cagliari, Dipartimento di Scienze Chimiche e Geologiche, Cittadella Universitaria, SS 554 Bivio per Sestu, 09042 Monserrato, CA, Italy
| | - Riccardo Petrini
- Università di Pisa, Dipartimento di Scienze della Terra, via S. Maria 53, 56126 Pisa, Italy.
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Yang Y, Zhang L, Wang Z, Liang B, Barbera G, Moffitt C, Li Y, Lin DT. A Two-Step GRIN Lens Coating for In Vivo Brain Imaging. Neurosci Bull 2019; 35:419-424. [PMID: 30852804 DOI: 10.1007/s12264-019-00356-x] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2018] [Accepted: 11/15/2018] [Indexed: 02/07/2023] Open
Abstract
The complex spatial and temporal organization of neural activity in the brain is important for information-processing that guides behavior. Hence, revealing the real-time neural dynamics in freely-moving animals is fundamental to elucidating brain function. Miniature fluorescence microscopes have been developed to fulfil this requirement. With the help of GRadient INdex (GRIN) lenses that relay optical images from deep brain regions to the surface, investigators can visualize neural activity during behavioral tasks in freely-moving animals. However, the application of GRIN lenses to deep brain imaging is severely limited by their availability. Here, we describe a protocol for GRIN lens coating that ensures successful long-term intravital imaging with commercially-available GRIN lenses.
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Affiliation(s)
- Yupeng Yang
- Hefei National Laboratory for Physical Sciences at the Microscale, School of Life Sciences, University of Science and Technology of China, Hefei, 230027, China.
| | - Lifeng Zhang
- Intramural Research Program, National Institute on Drug Abuse, National Institutes of Health, Baltimore, MD, 21224, USA.
| | - Zhenni Wang
- Hefei National Laboratory for Physical Sciences at the Microscale, School of Life Sciences, University of Science and Technology of China, Hefei, 230027, China
| | - Bo Liang
- Intramural Research Program, National Institute on Drug Abuse, National Institutes of Health, Baltimore, MD, 21224, USA
| | - Giovanni Barbera
- Intramural Research Program, National Institute on Drug Abuse, National Institutes of Health, Baltimore, MD, 21224, USA
| | - Casey Moffitt
- Intramural Research Program, National Institute on Drug Abuse, National Institutes of Health, Baltimore, MD, 21224, USA
| | - Yun Li
- Department of Zoology and Physiology, University of Wyoming College of Arts and Sciences, Laramie, WY, 82071, USA
| | - Da-Ting Lin
- Intramural Research Program, National Institute on Drug Abuse, National Institutes of Health, Baltimore, MD, 21224, USA
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Bramanti E, Onor M, Colombaioni L. Neurotoxicity Induced by Low Thallium Doses in Living Hippocampal Neurons: Evidence of Early Onset Mitochondrial Dysfunction and Correlation with Ethanol Production. ACS Chem Neurosci 2019; 10:451-459. [PMID: 30346713 DOI: 10.1021/acschemneuro.8b00343] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
The heavy metal thallium is an emerging pollutant among the most potentially toxic species to which human populations are exposed. Its harmful effects on living organisms are well-known at high doses, typical of acute intoxication. Its harmful effects at low doses are by far less known. In a previous paper, we reported a TlCl-induced metabolic shift to lactate and ethanol production in living hippocampal HN9.10e neurons that appeared after a single short exposure (48 h) at low doses (1-100 μg/L). This metabolic shift to lactate and ethanol suggests a marked impairment of cell bioenergetics. In this work, we provide detailed evidence for TlCl-induced changes of neuronal morphology and mitochondrial activity. Confocal microscopy and fluorescent probes were used to qualitatively and quantitatively analyze, at the subcellular level, living HN9.10e neurons during and after TlCl exposure. An early onset mitochondrial dysfunction appeared, associated with signs of cellular deregulation such as neurite shortening, loss of substrate adhesion, and increase of cytoplasmic calcium. The dose-dependent alteration of mitochondrial ROS (mtROS) level and of transmembrane mitochondrial potential (ΔΨm) has been observed also for very low TlCl doses (1 μg/L). The treatment with the ATP synthase inhibitor oligomycin revealed a severe impairment of the mitochondrial function, more significant than that measured by the simple quantification of the tetramethylrhodamine methyl ester (TMRM) fluorescence. These results highlight that mitochondria are a key subcellular target of TlCl neurotoxicity. The transmembrane mitochondrial potential was significantly correlated with the ethanol concentration in cell culture medium ( P < 0.001, r = -0.817), suggesting that ethanol could be potentially used as a biomarker of mitochondrial impairment.
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Affiliation(s)
- Emilia Bramanti
- Institute of Chemsitry of Organo Metallic Compounds-ICCOM, National Research Council of Italy, C.N.R., Pisa 56124, Italy
| | - Massimo Onor
- Institute of Chemsitry of Organo Metallic Compounds-ICCOM, National Research Council of Italy, C.N.R., Pisa 56124, Italy
| | - Laura Colombaioni
- CNR Neuroscience
Institute, Area della Ricerca CNR, Pisa 56124, Italy
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