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Zheng J, Wu M, Pang Y, Liu Q, Liu Y, Jin X, Tang J, Bao L, Niu Y, Zheng Y, Zhang R. Interior decorative volatile organic compounds exposure induces sleep disorders through aberrant branched chain amino acid transaminase 2 mediated glutamatergic signaling resulting from a neuroinflammatory cascade. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 934:173254. [PMID: 38761924 DOI: 10.1016/j.scitotenv.2024.173254] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2024] [Revised: 03/16/2024] [Accepted: 05/12/2024] [Indexed: 05/20/2024]
Abstract
Air pollution has been recognized as a contributing factor to sleep disorders (SD), which have been correlated with an elevated susceptibility to a variety of human diseases. Nevertheless, research has not definitively established a connection between SD and interior decorative volatile organic compounds (ID-VOCs), a significant indoor air pollutant. In this study, we employed a mouse model exposed to ID-VOCs to explore the impacts of ID-VOCs exposure on sleep patterns and the potential underlying mechanism. Of the 23 key compositions of ID-VOCs identified, aromatic hydrocarbons were found to be the most prevalent. Exposure to ID-VOCs in mice resulted in SD, characterized by prolonged wake fullness and decreased sleep during the light period. ID-VOCs exposure triggered neuroinflammatory responses in the suprachiasmatic nucleus (SCN), with microglia activation leading to the overproduction of inflammatory cytokines such as tumor necrosis factor-α (TNF-α), interleukin-1α (IL-1α), and complement component 1q (C1q), ultimately inducing A1 astrocytes. Consequently, the upregulation of branched chain amino acid transaminase 2 (BCAT2) in A1 astrocytes resulted in elevated extracellular glutamate and disruption of the wake-sleep transition mechanism, which might be the toxicological mechanism of SD caused by ID-VOCs.
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Affiliation(s)
- Jie Zheng
- Department of Toxicology, School of Public Health, Hebei Medical University, Shijiazhuang 050017, Hebei, PR China; Department of Neurosurgery, The Second Hospital of Hebei Medical University, Shijiazhuang 050000, Hebei, PR China
| | - Mengqi Wu
- Department of Toxicology, School of Public Health, Hebei Medical University, Shijiazhuang 050017, Hebei, PR China
| | - Yaxian Pang
- Department of Toxicology, School of Public Health, Hebei Medical University, Shijiazhuang 050017, Hebei, PR China
| | - Qingping Liu
- Department of Toxicology, School of Public Health, Hebei Medical University, Shijiazhuang 050017, Hebei, PR China
| | - Yan Liu
- Department of Toxicology, School of Public Health, Hebei Medical University, Shijiazhuang 050017, Hebei, PR China; School of Public Health, Inner Mongolia Medical University, Hohhot 010000, Inner Mongolia, PR China
| | - Xiaoting Jin
- Department of Occupational and Environmental Health, School of Public Health, Qingdao University, Qingdao 266071, Shandong, PR China
| | - Jinglong Tang
- Department of Occupational and Environmental Health, School of Public Health, Qingdao University, Qingdao 266071, Shandong, PR China
| | - Lei Bao
- Department of Occupational Health and Environmental Health, Hebei Medical University, Shijiazhuang 050017, Hebei, PR China
| | - Yujie Niu
- Department of Occupational Health and Environmental Health, Hebei Medical University, Shijiazhuang 050017, Hebei, PR China; Hebei Key Laboratory of Environment and Human Health, Hebei Medical University, Shijiazhuang 050017, Hebei, PR China
| | - Yuxin Zheng
- Department of Occupational and Environmental Health, School of Public Health, Qingdao University, Qingdao 266071, Shandong, PR China.
| | - Rong Zhang
- Department of Toxicology, School of Public Health, Hebei Medical University, Shijiazhuang 050017, Hebei, PR China; Hebei Key Laboratory of Environment and Human Health, Hebei Medical University, Shijiazhuang 050017, Hebei, PR China.
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Sriram K, Lin GX, Jefferson AM, McKinney W, Jackson MC, Cumpston JL, Cumpston JB, Leonard HD, Kashon ML, Fedan JS. Biological effects of inhaled crude oil vapor V. Altered biogenic amine neurotransmitters and neural protein expression. Toxicol Appl Pharmacol 2022; 449:116137. [PMID: 35750205 PMCID: PMC9936428 DOI: 10.1016/j.taap.2022.116137] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2022] [Revised: 06/06/2022] [Accepted: 06/17/2022] [Indexed: 12/19/2022]
Abstract
Workers in the oil and gas industry are at risk for exposure to a number of physical and chemical hazards at the workplace. Chemical hazard risks include inhalation of crude oil or its volatile components. While several studies have investigated the neurotoxic effects of volatile hydrocarbons, in general, there is a paucity of studies assessing the neurotoxicity of crude oil vapor (COV). Consequent to the 2010 Deepwater Horizon (DWH) oil spill, there is growing concern about the short- and long-term health effects of exposure to COV. NIOSH surveys suggested that the DWH oil spill cleanup workers experienced neurological symptoms, including depression and mood disorders, but the health effects apart from oil dispersants were difficult to discern. To investigate the potential neurological risks of COV, male Sprague-Dawley rats were exposed by whole-body inhalation to COV (300 ppm; Macondo surrogate crude oil) following an acute (6 h/d × 1 d) or sub-chronic (6 h/d × 4 d/wk. × 4 wks) exposure regimen. At 1, 28 or 90 d post-exposure, norepinephrine (NE), epinephrine (EPI), dopamine (DA) and serotonin (5-HT) were evaluated as neurotransmitter imbalances are associated with psychosocial-, motor- and cognitive- disorders. Sub-chronic COV exposure caused significant reductions in NE, EPI and DA in the dopaminergic brain regions, striatum (STR) and midbrain (MB), and a large increase in 5-HT in the STR. Further, sub-chronic exposure to COV caused upregulation of synaptic and Parkinson's disease-related proteins in the STR and MB. Whether such effects will lead to neurodegenerative outcomes remain to be investigated.
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Affiliation(s)
- Krishnan Sriram
- Health Effects Laboratory Division, National Institute for Occupational Safety and Health, Morgantown, WV 26505, United States of America.
| | - Gary X Lin
- Health Effects Laboratory Division, National Institute for Occupational Safety and Health, Morgantown, WV 26505, United States of America
| | - Amy M Jefferson
- Health Effects Laboratory Division, National Institute for Occupational Safety and Health, Morgantown, WV 26505, United States of America
| | - Walter McKinney
- Health Effects Laboratory Division, National Institute for Occupational Safety and Health, Morgantown, WV 26505, United States of America
| | - Mark C Jackson
- Health Effects Laboratory Division, National Institute for Occupational Safety and Health, Morgantown, WV 26505, United States of America
| | - Jared L Cumpston
- Health Effects Laboratory Division, National Institute for Occupational Safety and Health, Morgantown, WV 26505, United States of America
| | - James B Cumpston
- Health Effects Laboratory Division, National Institute for Occupational Safety and Health, Morgantown, WV 26505, United States of America
| | - Howard D Leonard
- Health Effects Laboratory Division, National Institute for Occupational Safety and Health, Morgantown, WV 26505, United States of America
| | - Michael L Kashon
- Health Effects Laboratory Division, National Institute for Occupational Safety and Health, Morgantown, WV 26505, United States of America
| | - Jeffrey S Fedan
- Health Effects Laboratory Division, National Institute for Occupational Safety and Health, Morgantown, WV 26505, United States of America
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Nitrogen, oxygen-codoped hierarchically porous biochar for simultaneous enrichment and ultrasensitive determination of o-xylene and its hydroxyl metabolites in human urine by solid phase microextraction-gas chromatography-mass spectrometry. Microchem J 2022. [DOI: 10.1016/j.microc.2022.107384] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Madaniyazi L, Jung CR, Fook Sheng Ng C, Seposo X, Hashizume M, Nakayama SF. Early life exposure to indoor air pollutants and the risk of neurodevelopmental delays: The Japan Environment and Children's Study. ENVIRONMENT INTERNATIONAL 2022; 158:107004. [PMID: 34991264 DOI: 10.1016/j.envint.2021.107004] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/21/2021] [Revised: 11/07/2021] [Accepted: 11/22/2021] [Indexed: 06/14/2023]
Abstract
Air pollution has been associated with childhood neurodevelopment. However, the role of indoor air pollution, especially volatile organic compounds (VOCs), on childhood neurodevelopment has been poorly explored to date. We investigated the association between indoor air pollutants and childhood neurodevelopment in 5,017 randomly selected children from the Japan Environment and Children's Study. When the participants reached 1.5 and 3 years of age, they were followed up with home visits and neurodevelopmental tests using the Ages and Stages Questionnaire (ASQ). At both ages, we collected indoor air samples for 1 week and measured 13 indoor air pollutants: particulate matter with an aerodynamic diameter of ≤2.5 μm, ozone, nitrogen dioxide, sulfur dioxide, and nine VOCs. The associations between air pollutants and ASQ scores were estimated using linear mixed effects models and weighted quantile sum regressions (WQS) at each age separately. Stratified analysis by sex was conducted. Exposure to m,p-xylene at the age of 3 was associated with lower communication, fine motor, and overall ASQ scores (coefficients: -0.18 [99% confidence intervals (CI): -0.35, -0.02], -0.23 [99 %CI: -0.43, -0.03], and - 0.72 [99 %CI: -1.41, -0.04] per 1 µg/m3 increase, respectively). Exposure to o-xylene at the age of 3 was associated with lower communication, gross motor, fine motor, and overall ASQ scores (coefficients: -0.48 [99 %CI: -0.90, -0.07], -0.45 [99 %CI: -0.78, -0.13], -0.65 [99 %CI: -1.14, -0.16], and -2.15 [99 %CI: -3.83, -0.47] per 1 µg/m3 increase, respectively). The WQS index was associated with lower gross motor ASQ scores at the age of 3 (coefficient: -0.27 [95 %CI: -0.51, -0.03] for one-unit WQS index increases), which was attributed to benzene (33.96%), toluene (26.02%), o-xylene (13.62%), and ethylbenzene (9.83%). Stratified analysis showed similar results. Although further investigations are required, our results suggest an association of neurodevelopmental delays with indoor low-level exposure to m,p-xylene and o-xylene in early life.
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Affiliation(s)
- Lina Madaniyazi
- Department of Pediatric Infectious Diseases, Institute of Tropical Medicine, Nagasaki University, Nagasaki, Japan; School of Tropical Medicine and Global Health, Nagasaki University, Nagasaki, Japan; Japan Environment and Children's Study Programme Office, National Institute for Environmental Studies, Tsukuba, Japan
| | - Chau-Ren Jung
- Japan Environment and Children's Study Programme Office, National Institute for Environmental Studies, Tsukuba, Japan; Department of Public Health, China Medical University, Taiwan
| | - Chris Fook Sheng Ng
- Department of Global Health Policy, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - Xerxes Seposo
- School of Tropical Medicine and Global Health, Nagasaki University, Nagasaki, Japan
| | - Masahiro Hashizume
- Department of Pediatric Infectious Diseases, Institute of Tropical Medicine, Nagasaki University, Nagasaki, Japan; Department of Global Health Policy, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - Shoji F Nakayama
- Japan Environment and Children's Study Programme Office, National Institute for Environmental Studies, Tsukuba, Japan.
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Krishnamurthy J, Engel LS, Wang L, Schwartz EG, Christenbury K, Kondrup B, Barrett J, Rusiecki JA. Neurological symptoms associated with oil spill response exposures: Results from the Deepwater Horizon Oil Spill Coast Guard Cohort Study. ENVIRONMENT INTERNATIONAL 2019; 131:104963. [PMID: 31382236 PMCID: PMC6786260 DOI: 10.1016/j.envint.2019.104963] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2019] [Revised: 06/21/2019] [Accepted: 06/24/2019] [Indexed: 05/23/2023]
Abstract
INTRODUCTION The Deepwater Horizon (DWH) oil spill was the largest marine oil spill in U.S. history, involving the response of tens of thousands clean-up workers. Over 8500 United States Coast Guard personnel were deployed in response to the spill. Little is understood about the acute neurological effects of oil spill clean-up-related exposures. Given the large number of people involved in large oil spill clean-ups, study of these effects is warranted. METHODS We utilized exposure, health, and lifestyle data from a post-deployment survey administered to Coast Guard responders to the DWH oil spill. Crude oil exposure was assessed via self-reported inhalation and skin contact metrics, categorized by frequency of self-reported exposure to crude oil during deployment (never, rarely, sometimes, most/all of the time). Combined exposure to crude oil and oil dispersant was also evaluated. Adjusted log binomial regressions were used to calculate prevalence ratios (PRs) and 95% confidence intervals (CI), investigating the associations between oil spill exposures and neurological symptoms during deployment. Stratified analyses investigated potential effect modification by sex, exhaust fume exposure, personal protective equipment (PPE) use, and deployment duration and timing. RESULTS Increasing frequency of crude oil exposure via inhalation was associated with increased likelihood of headaches (PRmost/all vs. never = 1.80), lightheadedness (PRmost/all vs. never = 3.36), difficulty concentrating (PRmost/all vs. never = 1.72), numbness/tingling sensation (PRmost/all vs. never = 3.32), blurred vision (PRmost/all vs. never = 2.87), and memory loss/confusion (PRmost/all vs. never = 2.03), with significant tests for trend. Similar results were found for crude oil exposure via skin contact. Exposure to both oil and oil dispersants yielded associations that were appreciably greater in magnitude than for oil alone for all neurological symptoms. Sensitivity analyses excluding responders in the highest environmental heat categories and responders with relevant pre-existing conditions indicated robustness of these results. Stratified analyses indicated possible effect modification by sex, PPE use, and heat exposure. CONCLUSIONS This study provides evidence of a cross sectional association between crude oil exposures and acute neurological symptoms in a sample of U.S. Coast Guard responders. Additionally, it suggests that exposure to both crude oil and oil dispersant may result in stronger associations and that heat may interact synergistically with oil exposures resulting in more acute neurological symptoms. Future investigations are needed to confirm these findings.
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Affiliation(s)
- Jayasree Krishnamurthy
- Department of Pediatrics, Uniformed Services University, Bethesda, MD, United States of America
| | - Lawrence S Engel
- Department of Epidemiology, Gillings School of Global Public Health, University of North Carolina, Chapel Hill, NC, United States of America
| | - Li Wang
- Department of Preventive Medicine and Biostatistics, Uniformed Services University, Bethesda, MD, United States of America
| | - Erica G Schwartz
- United States Coast Guard, Directorate of Health, Safety, and Work Life, Washington, DC, United States of America
| | | | - Benjamin Kondrup
- United States Naval Academy, Annapolis, MD, United States of America
| | - John Barrett
- Department of Preventive Medicine and Biostatistics, Uniformed Services University, Bethesda, MD, United States of America
| | - Jennifer A Rusiecki
- Department of Preventive Medicine and Biostatistics, Uniformed Services University, Bethesda, MD, United States of America.
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Rawi SM, Al-Logmani AS, Hamza RZ. Neurological alterations induced by formulated imidacloprid toxicity in Japanese quails. Metab Brain Dis 2019; 34:443-450. [PMID: 30607823 DOI: 10.1007/s11011-018-0377-1] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/15/2018] [Accepted: 12/20/2018] [Indexed: 01/10/2023]
Abstract
Agrochemical risk assessment that takes into account only pesticide active ingredients without the spray adjuvants will miss important toxicity outcomes detrimental to non-target species including birds. In the present study toxicity of imidacloprid (IMI) pesticide was evaluated individually and in a mixture with polyethylene glycol (PEG-600) as adjuvant against Japanese quails. Oral intubation was used to obtain concentration-mortality data. Oral intubation was used to obtain concentration-mortality data. Treatments of quails for 24 h with different doses leading to the calculation of LC50 values. PEG enhances the pesticide efficacy and the LD50 value of IMI was 17.02 mg/Kg1, and in combination with PEG it was 15.98 mg/kg-1. In the second phase of the study, the effects of a single acute dose of IMI (1/4 LD50) individually or in a mixture with PEG has a potent effect on the activity of plasma AChE and brain monoamines transmitters. However, the addition of PEG-adjuvant to the selected insecticide has shown more toxic potential, more highly significant decreases in AChE activity and different changes in cortical monoamines concentration. In the present study the maximum significant inhibition of AChE activity, was recorded post 72 h exposure to IMI individually and 96 h in a mixture with PEG and exhibited -37.56% and -32.65% decreases, respectively. Moreover, the oral intubation of IMI individually or in a mixture with PEG caused a significant elevation in the quail cortical NE and 5-HT. The result also showed while the mixture of IMI + PEG induced the more potent effect in DA alterations, IMI individually was more effective in 5-HT changes. Our findings also indicated that PEG exposure induced remarkable changes in the studied monoamines level and the values were significant throughout the tested periods in DA. Moreover, the studied dose level was vigorously affected quail brain cerebral cortex histological structure. When administered individually or in a mixture with PEG, IMI disclosed neural congestion, neuronal degeneration, pyknosis and perivascular cuffing with glial cells.
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Affiliation(s)
- Sayed M Rawi
- Biology Department, Faculty of Sciences, King Abdualaziz University, Jeddah, Kingdom of Saudi Arabia
- Biology Department, Faculty of Sciences and Arts, Jeddah University, Khulais, Kingdom of Saudi Arabia
- Zoology Department, Faculty of Science, Cairo University, Cairo, Egypt
| | - Ayed S Al-Logmani
- Biology Department, Faculty of Sciences and Arts, Jeddah University, Khulais, Kingdom of Saudi Arabia
| | - Reham Z Hamza
- Biology Department, Faculty of Science, Taif University, Taif, 888, Kingdom of Saudi Arabia.
- Zoology Department, Faculty of Science, Zagazig University, Zagazig, 44519, Egypt.
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Siegel M, Starks SE, Sanderson WT, Kamel F, Hoppin JA, Gerr F. Organic solvent exposure and depressive symptoms among licensed pesticide applicators in the Agricultural Health Study. Int Arch Occup Environ Health 2017; 90:849-857. [PMID: 28702848 DOI: 10.1007/s00420-017-1245-8] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2017] [Accepted: 07/04/2017] [Indexed: 11/26/2022]
Abstract
PURPOSE Although organic solvents are often used in agricultural operations, neurotoxic effects of solvent exposure have not been extensively studied among farmers. The current analysis examined associations between questionnaire-based metrics of organic solvent exposure and depressive symptoms among farmers. METHODS Results from 692 male Agricultural Health Study participants were analyzed. Solvent type and exposure duration were assessed by questionnaire. An "ever-use" variable and years of use categories were constructed for exposure to gasoline, paint/lacquer thinner, petroleum distillates, and any solvent. Depressive symptoms were ascertained with the Center for Epidemiologic Studies Depression Scale (CES-D); scores were analyzed separately as continuous (0-60) and dichotomous (<16 versus ≥16) variables. Multivariate linear and logistic regression models were used to estimate crude and adjusted associations between measures of solvent exposure and CES-D score. RESULTS Forty-one percent of the sample reported some solvent exposure. The mean CES-D score was 6.5 (SD 6.4; median 5; range 0-44); 92% of the sample had a score below 16. After adjusting for covariates, statistically significant associations were observed between ever-use of any solvent, long duration of any solvent exposure, ever-use of gasoline, ever-use of petroleum distillates, and short duration of petroleum distillate exposure and continuous CES-D score (p < 0.05). Although nearly all associations were positive, fewer statistically significant associations were observed between metrics of solvent exposure and the dichotomized CES-D variable. CONCLUSIONS Solvent exposures were associated with depressive symptoms among farmers. Efforts to limit exposure to organic solvents may reduce the risk of depressive symptoms among farmers.
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Affiliation(s)
- Miriam Siegel
- Department of Epidemiology, University of Kentucky College of Public Health, 111 Washington Avenue, Suite 213, Lexington, KY, 40536-0003, USA.
| | - Sarah E Starks
- Department of Occupational and Environmental Health, University of Iowa, University of Iowa Research Park, 140 IREH, Iowa City, IA, 52242-5000, USA
| | - Wayne T Sanderson
- Department of Epidemiology, University of Kentucky College of Public Health, 111 Washington Avenue, Suite 213, Lexington, KY, 40536-0003, USA
| | - Freya Kamel
- Epidemiology Branch, National Institute of Environmental Health Sciences, NIH, MD A3-05, Research Triangle Park, PO Box 12233, Durham, NC, 27709, USA
| | - Jane A Hoppin
- Epidemiology Branch, National Institute of Environmental Health Sciences, NIH, MD A3-05, Research Triangle Park, PO Box 12233, Durham, NC, 27709, USA
| | - Fred Gerr
- Department of Occupational and Environmental Health, University of Iowa, University of Iowa Research Park, 140 IREH, Iowa City, IA, 52242-5000, USA
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Rodriguez SC, Dalbey WE. Subchronic Neurotoxicity of Vaporized Diisopropyl Ether in Rats. Int J Toxicol 2016. [DOI: 10.1080/109158197226919] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
The neurotoxicity potential of diisopropyl ether (DIPE) during subchronic exposures was evaluated in rats using a functional observational battery (FOB), automated motor activity, and neuropathology. Sprague-Dawley rats were exposed 5 dl wk for 13 weeks by inhalation to either 0, 450, 3250, or 7060 ppm DIPE. Body weights were recorded weekly and clinical observations were recorded prior to each exposure. The FOB and a measurement of motor activity were performed before the first exposure. The FOB was repeated following 2, 4, 8, and 13 weeks of exposure, and motor activity was determined following 4, 8, and 13 weeks of exposure. After completion of the final evaluations, the animals were intravascularly perfused with phosphate-buffered 5% glutaraldehyde. Microscopic examination of the brain, spinal cord, gasserian and dorsal root ganglia, and sciatic nerve was performed on six animals/ group/ sex exposed to 0 or 7060 ppm DIPE. Motor activity in a figure-eight maze and unperturbed activity in the FOB were decreased at week 4 in females exposed to 7060 ppm; activity in the FOB was also decreased in females exposed to 450 ppm at week 4. Other changes in the FOB appeared to be minor, and none were observed during microscopic examination of tissues from the nervous system. In conclusion, inhalation exposures to DIPE at concentrations as high as 7060 ppm for 13 weeks resulted in few observable effects on the nervous system.
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Affiliation(s)
- S. C. Rodriguez
- Product Stewardship and Toxicology, Mobil Business Resources Corporation, Paulsboro, New Jersey, USA
| | - W. E. Dalbey
- Product Stewardship and Toxicology, Mobil Business Resources Corporation, Paulsboro, New Jersey, USA
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Zeliger HI. Exposure to lipophilic chemicals as a cause of neurological impairments, neurodevelopmental disorders and neurodegenerative diseases. Interdiscip Toxicol 2013; 6:103-10. [PMID: 24678247 PMCID: PMC3967436 DOI: 10.2478/intox-2013-0018] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2013] [Revised: 09/25/2013] [Accepted: 09/30/2013] [Indexed: 11/26/2022] Open
Abstract
Many studies have associated environmental exposure to chemicals with neurological impairments (NIs) including neuropathies, cognitive, motor and sensory impairments; neurodevelopmental disorders (NDDs) including autism and attention deficit hyperactivity disorder (ADHD); neurodegenerative diseases (NDGs) including Alzheimer's disease, Parkinson's disease and amyotrophic lateral sclerosis (ALS). The environmental chemicals shown to induce all these diseases include persistent organic pollutants (POPs), the plastic exudates bisphenol A and phthalates, low molecular weight hydrocarbons (LMWHCs) and polynuclear aromatic hydrocarbons (PAHs). It is reported here that though these chemicals differ widely in their chemical properties, reactivities and known points of attack in humans, a common link does exist between them. All are lipophilic species found in serum and they promote the sequential absorption of otherwise non-absorbed toxic hydrophilic species causing these diseases.
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Affiliation(s)
- Harold I Zeliger
- Zeliger Chemical, Toxicological, and Environmental Research, West Charlton, NY, USA
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Zeliger HI. Lipophilic chemical exposure as a cause of cardiovascular disease. Interdiscip Toxicol 2013; 6:55-62. [PMID: 24179429 PMCID: PMC3798856 DOI: 10.2478/intox-2013-0010] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2013] [Revised: 06/18/2013] [Accepted: 06/24/2013] [Indexed: 01/06/2023] Open
Abstract
Environmental chemical exposure has been linked to numerous diseases in humans. These diseases include cancers; neurological and neurodegenerative diseases; metabolic disorders including type 2 diabetes, metabolic syndrome and obesity; reproductive and developmental disorders; and endocrine disorders. Many studies have associated the link between exposures to environmental chemicals and cardiovascular disease (CVD). These chemicals include persistent organic pollutants (POPs); the plastic exudates bisphenol A and phthalates; low molecular weight hydrocarbons (LMWHCs); and poly nuclear aromatic hydrocarbons (PAHs). Here it is reported that though the chemicals reported on differ widely in chemical properties and known points of attack in humans, a common link exists between them. All are lipophilic species that are found in serum. Environmentally induced CVD is related to total lipophilic chemical load in the blood. Lipophiles serve to promote the absorption of otherwise not absorbed toxic hydrophilic species that promote CVD.
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Affiliation(s)
- Harold I Zeliger
- Zeliger Chemical, Toxicological and Environmental Research, West Charlton, New York, USA
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Lima CS, Nunes-Freitas AL, Ribeiro-Carvalho A, Filgueiras CC, Manhães AC, Meyer A, Abreu-Villaça Y. Exposure to methamidophos at adulthood adversely affects serotonergic biomarkers in the mouse brain. Neurotoxicology 2011; 32:718-24. [DOI: 10.1016/j.neuro.2011.08.002] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2011] [Revised: 06/02/2011] [Accepted: 08/11/2011] [Indexed: 12/29/2022]
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12
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Kinawy AA. Impact of gasoline inhalation on some neurobehavioural characteristics of male rats. BMC PHYSIOLOGY 2009; 9:21. [PMID: 19930677 PMCID: PMC2788517 DOI: 10.1186/1472-6793-9-21] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/04/2009] [Accepted: 11/24/2009] [Indexed: 01/01/2023]
Abstract
BACKGROUND This paper examines closely and compares the potential hazards of inhalation of two types of gasoline (car fuel). The first type is the commonly use leaded gasoline and the second is the unleaded type enriched with oxygenate additives as lead substituent in order to raise the octane number. The impacts of gasoline exposure on Na+, K+-ATPase, superoxide dismutase (SOD), acetylcholinesterase (AChE), total protein, reduced glutathione (GSH), and lipid peroxidation (TBARS) in the cerebral cortex, and monoamine neurotransmitters dopamine (DA), norepinephrine (NE) and serotonin (5-HT) in the cerebral cortex, hippocampus, cerebellum and hypothalamus were evaluated. The effect of gasoline exposure on the aggressive behaviour tests was also studied. RESULTS The present results revealed that gasoline inhalation induced significant fluctuations in the levels of the monoamine neurotransmitters in the studied brain regions. This was concomitant with a decrease in Na+, K+-ATPase activity and total protein content. Moreover, the group exposed to the unleaded gasoline exhibited an increase in lipid peroxidation and a decrease in AChE and superoxide dismutase activities. These physiological impairments were accompanied with a higher tendency towards aggressive behaviour as a consequence to gasoline inhalation. CONCLUSION It is concluded from the present work that chronic exposure to either the leaded or the unleaded gasoline vapours impaired the levels of monoamine neurotransmitters and other biochemical parameters in different brain areas and modulated several behavioural aspects related to aggression in rats.
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Affiliation(s)
- Amal A Kinawy
- Psychology department, Faculty of Arts, Cairo University, Egypt.
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Exposure to methamidophos at adulthood elicits depressive-like behavior in mice. Neurotoxicology 2009; 30:471-8. [DOI: 10.1016/j.neuro.2009.01.009] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2008] [Revised: 12/19/2008] [Accepted: 01/24/2009] [Indexed: 11/18/2022]
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Kirrane E, Loomis D, Egeghy P, Nylander-French L. Personal exposure to benzene from fuel emissions among commercial fishers: comparison of two-stroke, four-stroke and diesel engines. JOURNAL OF EXPOSURE SCIENCE & ENVIRONMENTAL EPIDEMIOLOGY 2007; 17:151-8. [PMID: 16736060 DOI: 10.1038/sj.jes.7500487] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
Commercial fishers are exposed to unburned hydrocarbon vapors and combustion products present in the emissions from their boat engines. The objective of this study was to measure personal exposure to benzene as a marker of fuel exposure, and to predict exposure levels across categories of carbureted two-stroke, four-stroke and diesel engines. A self-monitoring approach, employing passive monitors, was used to obtain measurements of personal exposure to benzene over time. Mixed-effect linear regression models were used to predict exposure levels, identify significant effects and determine restricted maximum likelihood estimates for within- and between-person variance components. Significant fixed effects for engine type and refueling a car or truck were identified. After controlling for refueling, predicted benzene exposure levels to fishers on boats equipped with two-stroke, four-stroke and diesel engines were 58.4, 38.9 and 15.7 microg/m3, respectively. The logged within-person variance component was 1.43, larger than the between-person variance component of 1.13, indicating that the total variation may be attributable to monitor placement, environmental conditions and other factors that change over time as well as differences between individual work practices. The health consequences of exposure to marine engine emissions are not known. The predicted levels are well below those at which health effects have been attributed, however.
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Affiliation(s)
- Ellen Kirrane
- RTI International, Research Triangle Park, North Carolina 27709-2194, USA.
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15
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Chu I, Poon R, Valli V, Yagminas A, Bowers WJ, Seegal R, Vincent R. Effects of an ethanol-gasoline mixture: results of a 4-week inhalation study in rats. J Appl Toxicol 2005; 25:193-9. [PMID: 15856534 DOI: 10.1002/jat.1051] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
The inhalation toxicity of an ethanol-gasoline mixture was investigated in rats. Groups of 15 male and 15 female rats were exposed by inhalation to 6130 ppm ethanol, 500 ppm gasoline or a mixture of 85% ethanol and 15% gasoline (by volume, 6130 ppm ethanol and 500 ppm gasoline), 6 h a day, 5 days per week for 4 weeks. Control rats of both genders received HEPA/charcoal-filtered room air. Ten males and ten females from each group were killed after 4 weeks of treatment and the remaining rats were exposed to filtered room air for an additional 4 weeks to determine the reversibility of toxic injuries. Female rats treated with the mixture showed growth suppression, which was reversed after 4 weeks of recovery. Increased kidney weight and elevated liver microsomal ethoxyresorufin-O-deethylase (EROD) activity, urinary ascorbic acid, hippuric acid and blood lymphocytes were observed and most of the effects were associated with gasoline exposure. Combined exposure to ethanol and gasoline appeared to exert an additive effect on growth suppression. Inflammation of the upper respiratory tract was observed only in the ethanol-gasoline mixture groups, and exposure to either ethanol and gasoline had no effect on the organ, suggesting that an irritating effect was produced when the two liquids were mixed. Morphology in the adrenal gland was characterized by vacuolation of the cortical area. Although histological changes were generally mild in male and female rats and were reversed after 4 weeks, the changes tended to be more severe in male rats. Brain biogenic amine levels were altered in ethanol- and gasoline-treated groups; their levels varied with respect to gender and brain region. Although no general interactions were observed in the brain neurotransmitters, gasoline appeared to suppress dopamine concentrations in the nucleus accumbens region co-exposed to ethanol. It was concluded that treatment with ethanol and gasoline, at the levels studied, produced mild, reversible biochemical hematological and histological effects, with some indications of interactions when they were co-administered.
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Affiliation(s)
- I Chu
- Safe Environments Directorate, Health Canada, Ottawa, Canada.
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16
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Aziz MH, Agrawal AK, Adhami VM, Ali MM, Baig MA, Seth PK. Methanol-induced neurotoxicity in pups exposed during lactation through mother: role of folic acid. Neurotoxicol Teratol 2002; 24:519-27. [PMID: 12127898 DOI: 10.1016/s0892-0362(02)00231-3] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Role of folic acid on methanol-induced neurotoxicity was studied in pups at Postnatal Day (PND) 45 exposed to methanol (1%, 2% and 4%, v/v) during lactation through mothers maintained on folic acid-deficient (FD) and folic acid-sufficient (FS) diet. A gradual loss in the body weight gain was observed in the pups exposed to 2% and 4% methanol in the FD group, while FS group exhibited this alteration only at 4% exposure. The assessment of spontaneous locomotor activity (SLA) showing a significant increase in the distance travelled was observed in the 2% and 4% methanol-exposed groups in both the FS and FD animals when compared with their respective controls, but the effect was more marked in the FD group. A significant decrease in the conditioned avoidance response (CAR) was observed in pups exposed to 2% and 4% methanol in the FD group at PND 45. The results also suggest that disturbances in dopaminergic and cholinergic receptors were more pronounced in the FD group as compared to the FS group. A significant decrease in striatal dopamine levels was also observed in the FD group at 2% and 4% methanol exposure, while in the FS group, a significant decrease was exhibited only at 4% methanol exposure. An aberrant increase in the expression of Growth-Associated Protein (GAP-43), a neuron-specific growth-associated protein was observed in pups in the FD group exposed to 2% and 4% methanol, while an increase in the expression of GAP-43 in the FS group was found only at 4% methanol exposure in the hippocampal region as compared to their respective controls. Results suggests that methanol exposure during growth spurt period adversely affects the developing brain, the effect being more pronounced in FD rats as compared to FS rats, suggesting a possible role of folic acid in methanol-induced neurotoxicity.
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Affiliation(s)
- Moammir Hasan Aziz
- Predictive Toxicology Group, Developmental Toxicology Division, Industrial Toxicology Research Centre, Post Box No. 80, M.G. Marg, Lucknow, India
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17
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Isbell M, Gordian ME, Duffy L. Winter indoor air pollution in Alaska: identifying a myth. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2002; 117:69-75. [PMID: 11843539 DOI: 10.1016/s0269-7491(01)00157-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The benzene and toluene levels inside three homes with attached garages were measured for 12 consecutive weeks during the winter months in Fairbanks, Alaska (Latitude 64.5 degrees N). Results for air samples collected over 12 h for the homes showed indoor benzene mixing ratios ranging from 1.6 to 20.4 parts per billion of mixing ratio volume (ppbv), and toluene air mixing ratios ranging from 7.3 to 41.6 ppbv. A correlation between benzene and toluene levels in each home and similar regression lines suggested the same major emission source, car and small equipment gasoline, present in attached garages. In one home, there was a correlation between indoor benzene mixing ratios and the urinary biomarker, trans,trans-muconic acid. Inside, air mixing ratios of benzene and toluene decreased with decreasing outside temperature in all homes studied, even though homes were relatively tight to prevent heat loss during this period of low winter outdoor temperatures. It is suggested that buildup of these pollutants indoors is prevented by the influence of an increased indoor/outdoor temperature differential and an ensuing increase in home ventilation.
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Affiliation(s)
- Maggie Isbell
- Department of Chemistry and Biochemistry, and Institute of Arctic Biology, University of Alaska, Fairbanks 99775-6160, USA
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18
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Abstract
The polyneuropathy caused by chronic gasoline inhalation is reported to be a gradually progressive, symmetric, sensorimotor polyneuropathy. We report unleaded gasoline sniffing by a female 14 years of age that precipitated peripheral neuropathy. In contrast with the previously reported presentation of peripheral neuropathy in gasoline inhalation, our patient developed multiple mononeuropathies superimposed on a background of sensorimotor polyneuropathy. The patient illustrates that gasoline sniffing neuropathy may present with acute multiple mononeuropathies resembling mononeuritis multiplex, possibly related to increased peripheral nerve susceptibility to pressure in the setting of neurotoxic components of gasoline. The presence of tetraethyl lead, which is no longer present in modern gasoline mixtures, is apparently not a necessary factor in the development of gasoline sniffer's neuropathy.
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Affiliation(s)
- T M Burns
- Department of Neurology, University of Virginia, Charlottesville, Virginia, USA
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Lapin C, Bui Q, Breglia R, Koschier F, Podhasky P, Lapadula E, Roth R, Schreiner C, White R, Clark C, Mandella R, Hoffman G. Toxicity evaluation of petroleum blending streams: inhalation subchronic toxicity/neurotoxicity study of a light catalytic cracked naphtha distillate in rats. Int J Toxicol 2001; 20:307-19. [PMID: 11766128 DOI: 10.1080/109158101753253045] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
Abstract
A 15-week, whole-body inhalation study of the vapors of a distillate (LCCN-D) of light catalytic cracked naphtha (CAS no. 64741-55-5, LCCN) was conducted with Sprague-Dawley rats. Target exposure concentrations were 0, 750, 2500, and 7500 ppm for 6 hours/day, 5 days/week. Over the course of the study, animals received at least 65 exposures. For a portion of the control and 7500-ppm groups, a 4-week postexposure period was included in the study. Subchronic toxicity was evaluated using standard parameters. During life, neurotoxicity was evaluated by motor activity assessment and a functional observational battery. Selected tissues from animals in all exposure groups were examined microscopically. Neuropathologic examination of selected neuronal tissues from animals in the control and high-exposure groups was also conducted. No compound-related effects were seen on survival, clinical chemistry, food consumption, or physical signs. No evidence of neurotoxicity was seen at any exposure level. Slight decreases in hematocrit and hemoglobin concentrations were seen in male rats at the end of exposure to 7500 ppm LCCN-D. However, values were within normal physiological ranges and recovery occurred. Slight decreases in mean body weights and body weight gain were observed in high-exposure females during the first 7 weeks of exposure, but this decrease was not seen during the second half of the study. Male rat nephropathy involving hyaline droplet formation and alpha-2micro-globulin accumulation was seen in mid- and high-exposure males, an effect not relevant to humans. The incidence and severity of goblet cell hypertrophy/hyperplasia and respiratory epithelium hyperplasia in nasoturbinal tissues were greater in high-exposure animals, but recovery occurred. None of the effects observed were considered toxicologically significant. The no-observable-adverse-effect level (NOAEL) for subchronic and neurotoxicity of LCCN-D was > or = 7500 ppm.
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Affiliation(s)
- C Lapin
- Petroleum Product Stewardship Council, Washington, DC, USA.
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20
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Pratt H, Karim N, Bleich N, Mittelman N. Short latency visual evoked potentials in occupational exposure to organic solvents. Neurophysiol Clin 2000; 30:306-12. [PMID: 11126642 DOI: 10.1016/s0987-7053(00)00230-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022] Open
Abstract
OBJECTIVES Short latency visual evoked potentials (SVEP), in response to high-intensity flashes from light emitting diodes (LED), were used to detect subclinical effects along the visual pathway in four groups of subjects with different levels of exposure to gasoline, all within legally acceptable limits. METHODS Potentials and exposure levels were obtained from 31 subjects with different occupational exposure levels to gasoline fumes, as well as from 17 non-exposed control subjects. SVEP were recorded from four electrode sites (infra-orbital, Cz, Pz, Oz), in response to flashes presented to each eye in turn from goggle-mounted LEDs. SVEP components were defined after digital filtering, which eliminated the high-frequency oscillatory potentials and accentuated five major components: a periocular P30, attributed to the retina; a fronto-central N50, attributed to the optic nerve; centro-parietal P65 and N85, attributed to the optic tracts and radiation; and an occipital, cortical P105. RESULTS The latencies of successive SVEP components of the exposed subjects showed a significant latency prolongation compared to controls, beginning with activity attributed to the optic nerve and increasing cumulatively with the later components. Retinal components were not affected by the exposure to organic solvents. Among the exposed groups, differences in latency prolongation corresponded to occupational exposure. CONCLUSION The low-frequency components of SVEP were reliably measured and proved to be sensitive to subclinical effects of organic solvents on conduction along the visual pathway. These components are likely to be sensitive to other subcortical visual pathway lesions, but their clinical promise needs further verification.
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Affiliation(s)
- H Pratt
- Evoked Potentials Laboratory, Behavioral Biology, Technion-Israel Institute of Technology, Haifa 32000, Israel
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21
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Lees-Haley PR. Methodology in epidemiological studies of human neurobehavioral toxicity: a case study with critical review. Psychol Rep 2000; 86:85-101. [PMID: 10778254 DOI: 10.2466/pr0.2000.86.1.85] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Health care professionals and government decision makers concerned with neurotoxicity increasingly rely on neuropsychological research studies. An example is an article relied upon by the U.S. Environmental Protection Agency that reported effects on neurobehavioral performance in a group of factory workers exposed to toluene by Foo, Jeyaratnam, and Koh in 1990, which is described as lacking reliability and as having implausible contents. A critical review can serve as an educational tool for neuropsychologists, to emphasize the need to design and document their research and interpret findings without speculation. For example, in the Foo, et al. study the implications of the findings for the general population cannot be interpreted. To conclude that this study has identified toluene as the cause of neurobehavioral deficits is a leap of inference far exceeding the power in their study. The review underscores the need for more critical reviews of research relied upon by decision makers and researchers.
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Affiliation(s)
- P R Lees-Haley
- Lees-Haley Psychological Corporation, Woodland Hills, California, USA.
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Kilburn KH. Effects of diesel exhaust on neurobehavioral and pulmonary functions. ARCHIVES OF ENVIRONMENTAL HEALTH 2000; 55:11-7. [PMID: 10735514 DOI: 10.1080/00039890009603379] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
Ten railroad workers and 6 electricians referred for shortness of breath also had slowness of response, memory loss, and disordered sleep, all of which suggested neurobehavioral impairment. The hypothesis was that diesel exhaust causes central nervous system impairment. Six electricians worked within enclosed concrete walls and roofs that trapped diesel exhaust from trucks. Seven railroad mechanics had tuned diesel engines indoors for 15-50 y, and 3 crewmen rode in locomotives. Neurobehavioral and visual functions were measured with a 26-test battery. Compared with unexposed men, the 16 in this study had significantly impaired reaction time, balance, blink reflex latency R-1, Culture Fair, peg placement, trail making, and verbal recall. Thirteen men had abnormal visual fields, and 11 had abnormal color confusion indices. Nine men had airways obstruction. The author could not attribute abnormalities to confounding factors or bias. Severe neurobehavioral impairment was associated with exposure to confined diesel exhaust. In additional studies of diesel-exposed workers, especially drivers of locomotives and trucks, investigators should use sensitive neurobehavioral methods.
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Affiliation(s)
- K H Kilburn
- University of Southern California, School of Medicine, Environmental Sciences Laboratory, Los Angeles 90033, USA
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Caprino L, Togna GI. Potential health effects of gasoline and its constituents: A review of current literature (1990-1997) on toxicological data. ENVIRONMENTAL HEALTH PERSPECTIVES 1998; 106:115-25. [PMID: 9452413 PMCID: PMC1533055 DOI: 10.1289/ehp.98106115] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
We reviewed toxicological studies, both experimental and epidemiological, that appeared in international literature in the period 1990-1997 and included both leaded and unleaded gasolines as well as their components and additives. The aim of this overview was to select, arrange, and present references of scientific papers published during the period under consideration and to summarize the data in order to give a comprehensive picture of the results of toxicological studies performed in laboratory animals (including carcinogenic, teratogenic, or embryotoxic activity), mutagenicity and genotoxic aspects in mammalian and bacterial systems, and epidemiological results obtained in humans in relation to gasoline exposure. This paper draws attention to the inherent difficulties in assessing with precision any potential adverse effects on health, that is, the risk of possible damage to man and his environment from gasoline. The difficulty of risk assessment still exists despite the fact that the studies examined are definitely more technically valid than those of earlier years. The uncertainty in overall risk determination from gasoline exposure also derives from the conflicting results of different studies, from the lack of a correct scientific approach in some studies, from the variable characteristics of the different gasoline mixtures, and from the difficulties of correctly handling potentially confounding variables related to lifestyle (e.g., cigarette smoking, drug use) or to preexisting pathological conditions. In this respect, this paper highlights the need for accurately assessing the conclusive explanations reported in scientific papers so as to avoid the spread of inaccurate or misleading information on gasoline toxicity in nonscientific papers and in mass-media messages.
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Affiliation(s)
- L Caprino
- Institute of Medical Pharmacology, University of Rome "La Sapienza," Rome, Italy
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Abstract
Thinner is a substance that is used for industrial purposes and for drug abuse; addiction is of young people (average age, 7.5 years). Although the health problem of voluntary or nonvoluntary solvent sniffing is important, great attention has been paid to the epidemiology and pharmacology of paint thinner or industrial solvents inhalation, but studies at the morphological and biochemical level are scarce. This work describes the morphological changes in the lung, liver, kidney, adrenal glands, and central nervous system induced by short- (up to 4 weeks) and long-term (up to 14 weeks) periods of thinner inhalation in rats.
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Affiliation(s)
- A Carabez
- Depto. Biología Celular Y Tisular, Facultad de Medicina, UNAM, México
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25
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Clary JJ. Methyl tert butyl ether systemic toxicity. RISK ANALYSIS : AN OFFICIAL PUBLICATION OF THE SOCIETY FOR RISK ANALYSIS 1997; 17:661-672. [PMID: 9463923 DOI: 10.1111/j.1539-6924.1997.tb01273.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
In male F344 rats exposed in a chronic inhalation study to methyl tertiary butyl ether (MTBE) a treatment related increase in severity of chronic nephropathy and mortality and an increase in hyaline droplets in the kidney were noted. Liver weights were increased in both rats and mice but no histological lesions other than hypertrophy are seen. Transient CNS effects but no indications of permanent nervous system effects were noted. MTBE is not a reproductive or developmental hazard. MTBE is rapidly absorbed. MTBE with some metabolite, tertiary butyl alcohol (TBA) and a little CO2 are excreted in the air. The urinary excretion products in animals are TBA metabolites, while in humans the urinary excretion products are MTBE and TBA. A comparison of the systematic responses of the possible metabolites TBA and formaldehyde indicate that they are not responsible for toxicity associated with MTBE, except that TBA may be partially responsible for the kidney effects reported. Animals and humans are similar in the uptake and excretion though with some differences in metabolism of MTBE. This supports the use of the animal data as a surrogate for humans.
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Affiliation(s)
- J J Clary
- Bio Risk, Midland, Michigan 48641-2326, USA
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