1
|
Sy M, Ndiaye D, da Silva I, Lacerda S, Charbonnière LJ, Tóth É, Nonat AM. 55/52Mn 2+ Complexes with a Bispidine-Phosphonate Ligand: High Kinetic Inertness for Imaging Applications. Inorg Chem 2022; 61:13421-13432. [PMID: 35984220 DOI: 10.1021/acs.inorgchem.2c01681] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Bispidine (3,7-diazabicyclo[3.3.1]nonane) provides a rigid and preorganized scaffold that is particularly interesting for the stable and inert complexation of metal ions, especially for their application in medical imaging. In this study, we present the synthesis of two bispidine ligands with N-methanephosphonate (H4L1) and N-methanecarboxylate (H3L2) substituents as well as the physico-chemical properties of the corresponding Mn2+ and Zn2+ complexes. The two complexes [Mn(L1)]2- and [Mn(L2)]- have relatively moderate thermodynamic stability constants according to potentiometric titration data. However, they both display an exceptional kinetic inertness, as assessed by transmetallation experiments in the presence of 50 equiv excess of Zn2+, showing only ∼40 and 20% of dissociation for [Mn(L1)]2- and [Mn(L2)]-, respectively, after 150 days at pH 6 and 37 °C. Proton relaxivities amount to r1 = 4.31 mM-1 s-1 ([Mn(L1)]2-) and 3.64 mM-1 s-1 ([Mn(L2)]-) at 20 MHz, 25 °C, and are remarkable for Mn2+ complexes with one inner-sphere water molecule (q = 1); they are comparable to that of the commercial contrast agent [Gd(DOTA)(H2O)]-. The presence of one inner-sphere water molecule and an associative water exchange mechanism was confirmed by temperature-dependent transverse 17O relaxation rate measurements, which yielded kex298 = 0.12 × 107 and 5.5 × 107 s-1 for the water exchange rate of the phosphonate and the carboxylate complex, respectively. In addition, radiolabeling experiments with 52Mn were also performed with H2(L1)2- showing excellent radiolabeling properties and quantitative complexation at pH 7 in 15 min at room temperature as well as excellent stability of the complex in various biological media over 24 h.
Collapse
Affiliation(s)
- Maryame Sy
- Equipe de Synthèse pour l'Analyse, Université de Strasbourg, CNRS, IPHC UMR 7178, F-67 037 Strasbourg, France
| | - Daouda Ndiaye
- Centre de Biophysique Moléculaire, CNRS UPR 4301, Université d'Orléans, rue Charles Sadron, F-45071 Orléans, France
| | - Isidro da Silva
- CEMHTI, CNRS UPR3079, Université d'Orléans, F-45071 Orléans 2, France
| | - Sara Lacerda
- Centre de Biophysique Moléculaire, CNRS UPR 4301, Université d'Orléans, rue Charles Sadron, F-45071 Orléans, France
| | - Loïc J Charbonnière
- Equipe de Synthèse pour l'Analyse, Université de Strasbourg, CNRS, IPHC UMR 7178, F-67 037 Strasbourg, France
| | - Éva Tóth
- Centre de Biophysique Moléculaire, CNRS UPR 4301, Université d'Orléans, rue Charles Sadron, F-45071 Orléans, France
| | - Aline M Nonat
- Equipe de Synthèse pour l'Analyse, Université de Strasbourg, CNRS, IPHC UMR 7178, F-67 037 Strasbourg, France
| |
Collapse
|
2
|
Rolle-McFarland D, Liu Y, Mostafaei F, Zauber SE, Zhou Y, Li Y, Fan Q, Zheng W, Nie LH, Wells EM. The association of bone and blood manganese with motor function in Chinese workers. Neurotoxicology 2022; 88:224-230. [PMID: 34896555 PMCID: PMC8748420 DOI: 10.1016/j.neuro.2021.12.005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2021] [Revised: 12/07/2021] [Accepted: 12/08/2021] [Indexed: 01/03/2023]
Abstract
Manganese (Mn) is an essential element. However, Mn overexposure is associated with motor dysfunction. This cross-sectional study assessed the association between bone Mn (BnMn) and whole blood Mn (BMn) with motor function in 59 Chinese workers. BnMn and BMn were measured using a transportable in vivo neutron activation analysis system and inductively coupled plasma mass spectrometry, respectively. Motor function (manual coordination, postural sway, postural hand tremor, and fine motor function) was assessed using the Coordination Ability Test System (CATSYS) and the Purdue Pegboard. Relationships between Mn biomarkers and motor test scores were analyzed with linear regression models adjusted for age, education, current employment, and current alcohol consumption. BMn was significantly inversely associated with hand tremor intensity (dominant hand (β=-0.04, 95 % confidence interval (CI):-0.07, -0.01; non-dominant hand β=-0.05, 95 % CI:-0.08, -0.01) hand tremor center frequency (non-dominant hand β=-1.61, 95 % CI:-3.03, -0.19) and positively associated with the Purdue Pegboard Assembly Score (β = 4.58, 95 % CI:1.08, 8.07). BnMn was significantly inversely associated with finger-tapping performance (non-dominant hand β=-0.02, 95 % CI:-0.04,-0.004), mean sway (eyes closed and foam β=-0.68, 95 % CI:-1.31,-0.04), and positively associated with hand tremor center frequency (dominant hand, β = 0.40, 95 % CI:0.002, 0.80). These results suggest BMn is related to better postural hand tremor and fine motor control and BnMn is related to worse motor coordination and postural hand tremor but better (i.e., less) postural sway. The unexpected positive results might be explained by choice of biomarker or confounding by work-related motor activities. Larger, longitudinal studies in this area are recommended.
Collapse
Affiliation(s)
- Danelle Rolle-McFarland
- School of Health Sciences, Purdue University, West
Lafayette, IN, USA.,OncoSynergy, Inc., Greenwich, CT, USA
| | - Yingzi Liu
- School of Health Sciences, Purdue University, West
Lafayette, IN, USA.,Department of Radiation Oncology, School of Medicine, Emory
University, Atlanta, GA, USA
| | - Farshad Mostafaei
- School of Health Sciences, Purdue University, West
Lafayette, IN, USA.,Department of Radiation Oncology, Augusta University,
Medical College of Georgia, Augusta, USA
| | - S. Elizabeth Zauber
- Department of Neurology, Indiana University School of
Medicine, Indianapolis, IN, USA
| | - Yuanzhong Zhou
- School of Public Health, Zunyi Medical University, Zunyi,
Guizhou, China
| | - Yan Li
- School of Public Health, Zunyi Medical University, Zunyi,
Guizhou, China
| | - Quiyan Fan
- Zunyi Medical and Pharmaceutical College, Zunyi, Guizhou,
China
| | - Wei Zheng
- School of Health Sciences, Purdue University, West
Lafayette, IN, USA
| | - Linda H. Nie
- School of Health Sciences, Purdue University, West
Lafayette, IN, USA
| | - Ellen M. Wells
- School of Health Sciences, Purdue University, West
Lafayette, IN, USA.,Corresponding author: Address: 550
Stadium Mall Drive; West Lafayette, IN 47907; USA, Phone: 1-765-496-3535,
| |
Collapse
|
3
|
Tabbassum S, Cheng P, Yanko FM, Balachandran R, Aschner M, Bowman AB, Nie LH. Whole body potassium as a biomarker for potassium uptake using a mouse model. Sci Rep 2021; 11:6385. [PMID: 33737537 PMCID: PMC7973570 DOI: 10.1038/s41598-021-85233-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2020] [Accepted: 02/26/2021] [Indexed: 11/28/2022] Open
Abstract
Potassium is known for its effect on modifiable chronic diseases like hypertension, cardiac disease, diabetes (type-2), and bone health. In this study, a new method, neutron generator based neutron activation analysis (NAA), was utilized to measure potassium (K) in mouse carcasses. A DD110 neutron generator based NAA assembly was used for irradiation.Thirty-two postmortem mice (n= 16 males and 16 females, average weight [Formula: see text] and [Formula: see text] g) were employed for this study. Soft-tissue equivalent mouse phantoms were prepared for the calibration. All mice were irradiated for 10 minutes, and the gamma spectrum with 42K was collected using a high efficiency, high purity germanium (HPGe) detector. A lead shielding assembly was designed and developed around the HPGe detector to obtain an improved detection limit. Each mouse sample was irradiated and measured twice to reduce uncertainty. The average potassium concentration was found to be significantly higher in males [Formula: see text] compared to females [Formula: see text]. We also observed a significant correlation between potassium concentration and the weight of the mice. The detection limit for potassium quantification with the NAA system was 46 ppm. The radiation dose to the mouse was approximately 56 [Formula: see text] mSv for 10-min irradiation. In conclusion, this method is suitable for estimating individual potassium concentration in small animals. The direct evaluation of total body potassium in small animals provides a new way to estimate potassium uptake in animal models. This method can be adapted later to quantify potassium in the human hand and small animals in vivo. When used in vivo, it is also expected to be a valuable tool for longitudinal assessment, kinetics, and health outcomes.
Collapse
Affiliation(s)
- Sana Tabbassum
- School of Health Sciences, Purdue University, West Lafayette, 47906, USA.
| | - Pinjing Cheng
- School of Health Sciences, Purdue University, West Lafayette, 47906, USA
- School of Nuclear Science and Technology, University of South China, Hengyang, China
| | - Frank M Yanko
- School of Health Sciences, Purdue University, West Lafayette, 47906, USA
| | - Rekha Balachandran
- School of Health Sciences, Purdue University, West Lafayette, 47906, USA
| | - Michael Aschner
- Department of Molecular Pharmacology, Albert Einstein College of Medicine, Bronx, NY, 10461, USA
| | - Aaron B Bowman
- School of Health Sciences, Purdue University, West Lafayette, 47906, USA
| | - Linda H Nie
- School of Health Sciences, Purdue University, West Lafayette, 47906, USA.
| |
Collapse
|
4
|
Tabbassum S, Nie LH. In vivo neutron activation assembly design for quantification of trace elements using MCNP. Physiol Meas 2020; 41. [PMID: 33080584 DOI: 10.1088/1361-6579/abc322] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2020] [Accepted: 10/20/2020] [Indexed: 02/04/2023]
Abstract
BACKGROUND Trace and essential elements both play a crucial role in maintaining normal cellular and organ functions in human, while abnormal exposure to some of them are also potentially related to diseases, e.g., manganism. To study the association between elemental intake and health outcomes, accurate assessment of elemental uptake and storage in the human body is essential. OBJECTIVES Neutron activation analysis based technology can be used for in vivo measurements of the trace elements given that the measurement system guarantees a low detection limit with an acceptable dose. This study aims to design and optimize a customized and portable deuterium-deuterium (DD) neutron generator-based irradiation assembly for neutron activation analysis of trace elements in vivo, using Monte Carlo simulations. METHODS The irradiation assembly includes a moderator, a fast neutron filter (FNF), reflector, and shielding. The human hand equivalent phantoms doped with manganese (Mn) and potassium (K) are used to determine the respective elements' system sensitivity and detection limit. RESULTS The calculated detection limit is 0.16 g Mn per gram dry bone (ppm) for Mn and 17 ppm for K, with an equivalent dose of 36 mSv to the hand for a 10 min irradiation. CONCLUSION This more sensitive in vivo neutron activation analysis system will detect trace elements in vivo.
Collapse
Affiliation(s)
| | - Linda Huiling Nie
- School of Health Sciences, Purdue University, 550 Stadium Mall Dr., West Lafayette, Indiana, 47907, UNITED STATES
| |
Collapse
|
5
|
Hasan Z, Rolle-McFarland D, Liu Y, Zhou J, Mostafaei F, Li Y, Fan Q, Zhou Y, Zheng W, Nie LH, Wells EM. Characterization of bone aluminum, a potential biomarker of cumulative exposure, within an occupational population from Zunyi, China. J Trace Elem Med Biol 2020; 59:126469. [PMID: 31982817 PMCID: PMC7112220 DOI: 10.1016/j.jtemb.2020.126469] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/16/2019] [Revised: 12/04/2019] [Accepted: 01/13/2020] [Indexed: 11/18/2022]
Abstract
OBJECTIVES Aluminum (Al) is a neurotoxicant; however, efforts to understand Al toxicity are limited by the lack of a quantitative biomarker of cumulative exposure. Bone Al measurements may address this need. Here, we describe and compare non-invasive bone Al measurements with fingernail Al and Al cumulative exposure indices (CEIs). METHODS We completed a cross-sectional study of 43 factory workers in Zunyi, China. Bone Al measurements were taken with a compact in-vivo neutron activation analysis system (IVNAA). Fingernail samples were analyzed using inductively coupled plasma mass spectrometry. CEIs, based on self-reported work history and prior literature, were calculated for the prior 5, 10, 15, 20 years and lifetime work history. Linear regressions adjusted for age and education compared fingernail Al and Al CEIs with bone Al. RESULTS Median (interquartile range (IQR)) Al measurements were: 15 μg/g dry bone (IQR = 28) for bone Al; 34.9 μg/g (43.3) for fingernail; and 24 (20) for lifetime CEI. In adjusted regression models, an increase in 15-year CEI was significantly associated with increased bone Al (β = 0.91, 95% confidence interval (CI): 0.16, 1.66). Associations of bone Al with 10- and 20-year CEI were approaching statistical significance (β = 0.98, 95% CI: -0.14, 2.1; β = 0.59, 95% CI: -0.01, 1.18, respectively). Other models were not statistically significant. CONCLUSIONS Bone Al was significantly associated with 15-year Al CEI, but not other Al CEIs or fingernail Al. Bone Al may be a useful measure of cumulative, rather than short-term, Al exposure. Additional refinement of this method is ongoing.
Collapse
Affiliation(s)
- Zainab Hasan
- School of Health Sciences, Purdue University, West Lafayette, IN, USA
| | - Danelle Rolle-McFarland
- Department of Cancer Epidemiology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL, USA
| | - Yingzi Liu
- Department of Radiation Oncology, Emory University, Atlanta, GA, USA
| | - Jieqiong Zhou
- School of Public Health, Yale University, New Haven, CT, USA
| | - Farshad Mostafaei
- Department of Radiation Oncology, University of Arizona, Tucson, AZ, USA
| | - Yan Li
- School of Public Health, Zunyi Medical University, Zunyi, Guizhou, China
| | - Qiyuan Fan
- Zunyi Medical and Pharmaceutical College, Zunyi, Guizhou, China
| | - Yuanzhong Zhou
- School of Public Health, Zunyi Medical University, Zunyi, Guizhou, China
| | - Wei Zheng
- School of Health Sciences, Purdue University, West Lafayette, IN, USA
| | - Linda H Nie
- School of Health Sciences, Purdue University, West Lafayette, IN, USA
| | - Ellen M Wells
- School of Health Sciences, Purdue University, West Lafayette, IN, USA.
| |
Collapse
|
6
|
Rolle-McFarland D, Liu Y, Mostafaei F, Zauber SE, Zhou Y, Li Y, Fan Q, Zheng W, Nie LH, Wells EM. The association of bone, fingernail and blood manganese with cognitive and olfactory function in Chinese workers. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 666:1003-1010. [PMID: 30970467 PMCID: PMC6461352 DOI: 10.1016/j.scitotenv.2019.02.208] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/24/2018] [Revised: 02/12/2019] [Accepted: 02/13/2019] [Indexed: 05/28/2023]
Abstract
Occupational manganese (Mn) exposure has been associated with cognitive and olfactory dysfunction; however, few studies have incorporated cumulative biomarkers of Mn exposure such as bone Mn (BnMn). Our goal was to assess the cross-sectional association between BnMn, blood Mn (BMn), and fingernail Mn (FMn) with cognitive and olfactory function among Mn-exposed workers. A transportable in vivo neutron activation analysis (IVNAA) system was designed and utilized to assess BnMn among 60 Chinese workers. BMn and FMn were measured using inductively coupled plasma mass spectrometry. Cognitive and olfactory function was assessed using Animal and Fruit Naming tests, World Health Organization/University of California-Los Angeles Auditory Verbal Learning Test (AVLT) and the University of Pennsylvania Smell Identification Test (UPSIT). Additional data were obtained via questionnaire. Regression models adjusted for age, education, factory of employment, and smoking status (UPSIT only), were used to assess the relationship between Mn biomarkers and test scores. In adjusted models, increasing BnMn was significantly associated with decreased performance on average AVLT scores [β (95% confidence interval (CI)) = -0.65 (-1.21, -0.09)] and Animal Naming scores [β (95% CI) = -1.54 (-3.00, -0.07)]. Increasing FMn was significantly associated with reduced performance measured by the average AVLT [β (95% CI) = -0.35 (-0.70, -0.006)] and the difference in AVLT scores [β (95% CI) = -0.40 (-0.77, -0.03)]. BMn was not significantly associated with any test scores; no significant associations were observed with Fruit Naming or UPSIT tests. BnMn and FMn, but not BMn, are associated with cognitive function in Mn-exposed workers. None of the biomarkers were significantly associated with olfactory function.
Collapse
Affiliation(s)
- Danelle Rolle-McFarland
- School of Health Sciences, Purdue University, West Lafayette, IN, USA; Public Health Graduate Program, Purdue University, West Lafayette, IN, USA; Department of Cancer Epidemiology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL, USA
| | - Yingzi Liu
- School of Health Sciences, Purdue University, West Lafayette, IN, USA; Department of Radiation Oncology, School of Medicine, Emory University, Atlanta, GA, USA
| | - Farshad Mostafaei
- School of Health Sciences, Purdue University, West Lafayette, IN, USA; Department of Radiation Oncology, University of Arizona, Tucson, AZ, USA
| | - S Elizabeth Zauber
- Department of Neurology, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Yuanzhong Zhou
- School of Public Health, Zunyi Medical University, Zunyi, Guizhou, China
| | - Yan Li
- School of Public Health, Zunyi Medical University, Zunyi, Guizhou, China
| | - Qiyuan Fan
- Zunyi Medical and Pharmaceutical College, Zunyi, Guizhou, China
| | - Wei Zheng
- School of Health Sciences, Purdue University, West Lafayette, IN, USA
| | - Linda H Nie
- School of Health Sciences, Purdue University, West Lafayette, IN, USA
| | - Ellen M Wells
- School of Health Sciences, Purdue University, West Lafayette, IN, USA; Public Health Graduate Program, Purdue University, West Lafayette, IN, USA.
| |
Collapse
|
7
|
Development of a Cumulative Exposure Index (CEI) for Manganese and Comparison with Bone Manganese and Other Biomarkers of Manganese Exposure. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2018; 15:ijerph15071341. [PMID: 29949870 PMCID: PMC6068959 DOI: 10.3390/ijerph15071341] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/16/2018] [Revised: 06/13/2018] [Accepted: 06/22/2018] [Indexed: 01/17/2023]
Abstract
Manganese (Mn) exposure can result in parkinsonism. However, understanding of manganese neurotoxicity has been limited by the lack of a cumulative Mn biomarker. Therefore, the current goal was to develop Mn cumulative exposure indices (MnCEI), an established method to estimate cumulative exposure, and determine associations of MnCEI with blood Mn (BMn), fingernail Mn (FMn), and bone Mn (BnMn). We completed a cross-sectional study of 60 male Chinese workers. Self-reported occupational history was used to create two MnCEIs reflecting the previous 16 years (MnCEI16) and total work history (MnCEITOT). An in vivo neutron activation analysis system was used to quantify BnMn. BMn and FMn were measured using ICP-MS. Mean (standard deviation) MnCEITOT and MnCEI16 were 37.5 (22.0) and 25.0 (11.3), respectively. Median (interquartile range) BMn, FMn, and BnMn were 14.1 (4.0) μg/L, 13.5 (58.5) μg/g, and 2.6 (7.2) μg/g dry bone, respectively. MnCEI16 was significantly correlated with FMn (Spearman’s ρ = 0.44; p = 0.02), BnMn (ρ = 0.44; p < 0.01), and MnCEITOT (ρ = 0.44; p < 0.01). In adjusted regression models, MnCEI16 was significantly associated with BnMn (β = 0.03; 95% confidence interval = 0.001, 0.05); no other biomarkers were associated with MnCEI. This suggests BnMn may be a useful biomarker of the previous 16 years of Mn exposure, but larger studies are recommended.
Collapse
|
8
|
Coyne MD, Neumann C, Zhang X, Byrne P, Liu Y, Weaver CM, Nie LH. Compact DD generator-based in vivo neutron activation analysis (IVNAA) system to determine sodium concentrations in human bone. Physiol Meas 2018; 39:055004. [PMID: 29658892 DOI: 10.1088/1361-6579/aabe66] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
OBJECTIVE This study presents the development of a noninvasive method for monitoring Na in human bone. Many diseases, such as hypertension and osteoporosis, are closely associated with sodium (Na) retention in the human body. Na retention is generally evaluated by calculating the difference between dietary intake and excretion. There is currently no method to directly quantify Na retained in the body. Bone is a storage for many elements, including Na, which renders bone Na an ideal biomarker to study Na metabolism and retention. APPROACH A customized compact deuterium-deuterium (DD) neutron generator was used to produce neutrons for in vivo neutron activation analysis (IVNAA), with a moderator/reflector/shielding assembly optimized for human hand irradiation in order to maximize the thermal neutron flux inside the irradiation cave and to limit radiation exposure to the hand and the whole body. MAIN RESULTS The experimental results show that the system is able to detect sodium levels in the bone as low as 16 µg Na g-1 dry bone with an effective dose to the body of about 27 µSv. The simulation results agree with the numbers estimated from the experiment. SIGNIFICANCE This is expected to be a feasible method for measuring the change of Na in bone. The low detection limit indicates this will be a useful system to study the association between Na retention and related diseases.
Collapse
Affiliation(s)
- Mychaela D Coyne
- School of Health Sciences, Purdue University, West Lafayette, IN, United States of America
| | | | | | | | | | | | | |
Collapse
|
9
|
Liu Y, Rolle-McFarland D, Mostafaei F, Zhou Y, Li Y, Zheng W, Wells E, Nie LH. In vivo neutron activation analysis of bone manganese in workers. Physiol Meas 2018; 39:035003. [PMID: 29328060 DOI: 10.1088/1361-6579/aaa749] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
OBJECTIVE Manganese (Mn) is a neurotoxin. However, the impact of elevated, chronic Mn exposure is not well understood, partially due to the lack of a cumulative exposure biomarker. To address this gap, our group developed a compact in vivo neutron activation analysis (IVNAA) system to quantify Mn concentration in bone (MnBn). APPROACH In this study, we used this system and determined MnBn among male Chinese workers and compared results to their blood Mn (MnB), a measure of recent exposure, and the years of employment, a measure of cumulative exposure. A cross-sectional study was conducted with 30 ferroalloy smelters (exposed) and 30 general manufacturing workers (controls). MnBn was assessed using IVNAA, MnB was measured with inductively coupled plasma mass spectrometry, and occupational history and demographics were obtained via questionnaire. Mn-doped phantoms were used to generate a calibration curve; spectra from these phantoms were consistent with in vivo spectra. MAIN RESULTS The median (interquartile range (IQR)) values for Mn biomarkers were 2.7 µg g-1 (7.2) for MnBn and 14.1 µg l-1 (4.0) for MnB. In regression models adjusted for age and education, the natural log transformed MnBn (ln(MnBn)) was significantly associated with the exposed/control status (β = 0.44, p = 0.047) and years of employment (β = 0.05, p = 0.002), but not with natural log transformed MnB (ln(MnB)) (β = 0.54, p = 0.188). SIGNIFICANCE Our results support the use of IVNAA to quantify MnBn and the use of MnBn as a biomarker of cumulative Mn exposure.
Collapse
Affiliation(s)
- Yingzi Liu
- School of Health Sciences, Purdue University, West Lafayette, IN 47906, United States of America. Willis-Knighton Cancer Center, Shreveport, LA 71105, United States of America
| | | | | | | | | | | | | | | |
Collapse
|
10
|
Wells EM, Liu Y, Rolle-McFarland D, Mostafaei F, Zheng W, Nie LH. In vivo measurement of bone manganese and association with manual dexterity: A pilot study. ENVIRONMENTAL RESEARCH 2018; 160:35-38. [PMID: 28961467 PMCID: PMC5962822 DOI: 10.1016/j.envres.2017.09.016] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/17/2017] [Revised: 09/13/2017] [Accepted: 09/15/2017] [Indexed: 05/05/2023]
Abstract
We used neutron activation analysis (NAA) to measure hand bone manganese (BnMn) in 19 adult males. Median BnMn was 0.89µg/g dry bone (interquartile range = 1.07). After adjustment for age and occupation, higher ln(BnMn) was significantly associated with lower manual dexterity based on the Purdue Pegboard assembly task: β = -1.77, standard error = 0.79, p = 0.04. Due to the small sample size, these results should be interpreted cautiously. BnMn appears to be a promising biomarker, and should be further studied.
Collapse
Affiliation(s)
- Ellen M Wells
- School of Health Sciences, Purdue University, West Lafayette, IN 47907, United States.
| | - Yingzi Liu
- School of Health Sciences, Purdue University, West Lafayette, IN 47907, United States; Willis-Knighton Health System, Shreveport, LA 71105, United States
| | | | - Farshad Mostafaei
- School of Health Sciences, Purdue University, West Lafayette, IN 47907, United States; Department of Radiation Oncology, Medical College of Wisconsin, Milwaukee, WI 53226, United States
| | - Wei Zheng
- School of Health Sciences, Purdue University, West Lafayette, IN 47907, United States
| | - Linda H Nie
- School of Health Sciences, Purdue University, West Lafayette, IN 47907, United States
| |
Collapse
|
11
|
Fan X, Luo Y, Fan Q, Zheng W. Reduced expression of PARK2 in manganese-exposed smelting workers. Neurotoxicology 2017; 62:258-264. [PMID: 28826884 PMCID: PMC5676304 DOI: 10.1016/j.neuro.2017.08.006] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2017] [Revised: 07/26/2017] [Accepted: 08/13/2017] [Indexed: 11/28/2022]
Abstract
Manganese (Mn) is widely used in modern industries. Occupational exposure to Mn is known to cause clinical syndromes similar, but not identical to, Parkinson's disease. This human cohort study was designed to investigate if workers exposed to Mn altered the PARK2 gene expression, leading to Mn-induced neurotoxicity. Workers (n=26) occupationally exposed to Mn were recruited from a Mn-iron (Fe) alloy smelter, and control workers (n=20) without Mn-exposure were from an Fe smelter from Zunyi City in China. Subjects were matched with socioeconomic status and background for environmental factors. Metal concentrations were determined by atomic absorption spectrophotometry (AAS). Total RNA from the blood samples was isolated and analyzed by RT-PCR to quantify PARK2. The data showed that Mn concentrations in plasma, red blood cell (RBC) and saliva, and the cumulative Mn-exposure were about 2.2, 2.0, 1.7 and 3.0 fold higher, respectively, in Mn-exposed workers than those in control subjects (p<0.01). The expression of PARK2 in Mn-exposed workers was significantly decreased by 42% as compared to controls (p<0.01). Linear regression analysis further established that the expression of PARK2 mRNA was inversely correlated with Mn levels in plasma, RBC and saliva, as well as the cumulative Mn exposure (p<0.01). Taken together, it seems likely that Mn exposure among smelters may lead to a reduced expression of PARK2, which may partly explain the Mn-induced Parkinsonian disorder.
Collapse
Affiliation(s)
- Ximin Fan
- School of Public Health, Zunyi Medical College, Zunyi, Guizhou, China.
| | - Ying Luo
- School of Public Health, Zunyi Medical College, Zunyi, Guizhou, China
| | - Qiyuan Fan
- Department of Health Management, Zunyi Medical and Pharmaceutical College, Zunyi, Guizhou, China.
| | - Wei Zheng
- School of Health Sciences, Purdue University, West Lafayette, IN, United States.
| |
Collapse
|