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Alehashem M, Peters R, Fajana HO, Eslamizad S, Hogan N, Hecker M, Siciliano SD. Herbicides and pesticides synergistically interact at low concentrations in complex mixtures. CHEMOSPHERE 2024; 353:141431. [PMID: 38401859 DOI: 10.1016/j.chemosphere.2024.141431] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/26/2023] [Revised: 01/31/2024] [Accepted: 02/08/2024] [Indexed: 02/26/2024]
Abstract
Assessing a complex mixture of pesticides at the impacted sites has been challenging for risk assessors for 50 years. The default assumption is that at low concentrations, pesticides interact additively with one another; thus, the risk posed by each component of a complex mixture could be simply added up. The EPA interaction-based hazard index (HIInteraction) modifies this assumption using a binary weight-of-evidence (BINWOE). However, data gaps often preclude HIInteraction use at most sites. This study evaluated these assumptions using the BINWOE to estimate the hazard index (HI) of select pesticide mixtures. The lack of in vivo binary interaction data led us to use a cell line, SH-SY5Y, to obtain the data necessary for the BINWOE approach. In the risk assessment, we considered the most active exposure scenario inhaling a mixture of volatile pesticides from contaminated soil and groundwater. The potential interactions between pesticides in 15 binary mixtures were investigated using the MTT assay in SH-SY5Y cells. Our findings showed that 60% of the binary mixtures elicited synergism (in at least one concentration), 27% displayed antagonism, and 13% showed additive effects in SH-SY5Y cells. Combining human safety data with in vitro interaction data indicated that adults and toddlers were at the highest risk when considering industrial and commercial land use, respectively, compared to other subpopulations. Incorporating interaction data into the risk assessment either increased the risk by up to 20% or decreased the risk by 2%, depending on the mixture. Our results demonstrate the predominant synergistic interactions, even at low concentrations, altered risk characterization at the complex operating site. Most concerning, organochlorine pesticides with the same mechanism of action did not follow dose additivity when evaluated by SH-SY5Y cell lines. Based on our observations, we caution that current HI methods based on additivity assumptions may underestimate the risk of organochlorine mixtures.
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Affiliation(s)
- M Alehashem
- Toxicology Centre, University of Saskatchewan, Saskatoon, SK S7N 5B3, Canada
| | - R Peters
- Federated Co-operatives Limited, Saskatoon, SK, S7K 0H2, Canada
| | - H O Fajana
- Toxicology Centre, University of Saskatchewan, Saskatoon, SK S7N 5B3, Canada; Department of Soil Science, University of Saskatchewan, Saskatoon, SK, S7N 5A8, Canada
| | - S Eslamizad
- Food Safety Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - N Hogan
- Toxicology Centre, University of Saskatchewan, Saskatoon, SK S7N 5B3, Canada; Department of Animal Science, University of Saskatchewan, Saskatoon, SK, Canada
| | - M Hecker
- Toxicology Centre, University of Saskatchewan, Saskatoon, SK S7N 5B3, Canada; School of Environment and Sustainability, University of Saskatchewan, Saskatoon, SK S7N 5C8, Canada
| | - S D Siciliano
- Toxicology Centre, University of Saskatchewan, Saskatoon, SK S7N 5B3, Canada; Department of Soil Science, University of Saskatchewan, Saskatoon, SK, S7N 5A8, Canada.
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Wulf J, Lewit N, Akter S, K Bwambok D, Anum D, Alonge T, Kuedukey C, Bolton B, Dassow B, Halim MA, O Fakayode S. Evaluating binding and interaction of selected pesticides with serum albumin proteins by Raman, 1H NMR, mass spectrometry and molecular dynamics simulation. J Biomol Struct Dyn 2024:1-14. [PMID: 38197596 DOI: 10.1080/07391102.2024.2302344] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2023] [Accepted: 11/23/2023] [Indexed: 01/11/2024]
Abstract
Addressing the acute pesticide poisoning and toxicity to humans, is a global challenge of top priority. Serum albumin is the most abundant plasma protein, capable of binding with herbicide and pesticide residues. This study reports multifaceted approaches for in-depth and robust investigation of the molecular interactions of selected pesticides, including propanil (PPL), bromoxynil (BXL), metolachlor (MLR) and glyphosate (GPE) with bovine serum albumin (BSA) proteins using experimental (Raman and FTIR spectroscopy, native mass spectrometry and high field 1H NMR), molecular dynamics (MD) simulation and principal component analysis (PCA). The binding of pesticides with BSA resulted in BSA amide I and amide II Raman spectral shifts. PCA of Raman spectra of serum-pesticide complexes showed the grouping of pesticides on the score plot based on the similarities and differences in pesticides' chemical structures. Native mass spectrometry results revealed strong adduct formation of the pesticides with the protein. The observed changes in chemical shifts, peak broadening or peak disappearance of characteristic proton signals of the pesticides, indicated altered chemical environments due to binding BSA-pesticides interactions. The results of MD simulation conducted for over 500 ns revealed strong pesticides interaction with LEU197, LEU218, LEU237, TRP213, SER286 and ILE289 residues to the site I of BSA. Free energy landscapes provided insights into the conformational changes in BSA on the binding of pesticides. Overall, the experimental and computational results are in consonant and indicate the binding of pesticides into the site I and site II (sub-domain IIA) of the BSA via hydrogen bonding, non-covalent and hydrophobic interactions.Communicated by Ramaswamy H. Sarma.
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Affiliation(s)
- Josefa Wulf
- Department of Chemistry and Biochemistry, Kennesaw State University, Kennesaw, GA, USA
| | - Noam Lewit
- Department of Chemistry and Biochemistry, Kennesaw State University, Kennesaw, GA, USA
| | - Shaila Akter
- Division of Quantum Chemistry, The Red-Green Research Centre, BICCB, Dhaka, Bangladesh
| | - David K Bwambok
- Department of Chemistry, Ball State University, Muncie, IN, USA
| | - Davis Anum
- Department of Chemistry, Ball State University, Muncie, IN, USA
| | - Temitope Alonge
- Department of Chemistry, Ball State University, Muncie, IN, USA
| | | | - Brinkley Bolton
- Department of Chemistry, Physics & Astronomy, Georgia College & State University, Milledgeville, GA, USA
| | - Bailey Dassow
- Department of Chemistry, Physics & Astronomy, Georgia College & State University, Milledgeville, GA, USA
| | - Mohammad A Halim
- Department of Chemistry and Biochemistry, Kennesaw State University, Kennesaw, GA, USA
| | - Sayo O Fakayode
- Department of Chemistry, Physics & Astronomy, Georgia College & State University, Milledgeville, GA, USA
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Lopes LT, Rodrigues JM, Baccarin C, Oliveira K, Abreu M, Ribeiro V, Anastácio ZC, Machado JP. Autism Spectrum as an Etiologic Systemic Disorder: A Protocol for an Umbrella Review. Healthcare (Basel) 2022; 10:healthcare10112200. [PMID: 36360541 PMCID: PMC9690003 DOI: 10.3390/healthcare10112200] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2022] [Revised: 10/29/2022] [Accepted: 10/31/2022] [Indexed: 11/06/2022] Open
Abstract
Autism spectrum disorder (ASD) is the most common neurodevelopmental disorder with a huge prevalence increasing every year (1/44 children). Still diagnosed as a mental disorder, the last 10 years of research found possible causes, risks, genetics, environmental triggers, epigenetics, metabolic, immunological, and neurophysiological unbalances as relevant aetiology. Umbrella methodology is the highest level of scientific evidence, designed to support clinical and political decisions. A literature search for autism aetiology, pathophysiology, or causes, conducted in the last 10 years, at PubMed, Embase, Cochrane, Scopus, and the Web of Science, resulted in six umbrella reviews. Nevertheless, only one quantitative analysis reported risk factors and biomarkers but excluded genetics, experiments on animal models, and post-mortem studies. We grouped ASD’s multi-factorial causes and risks into five etiological categories: genetic, epigenetic, organic, psychogenic, and environmental. Findings suggest that autism might be evaluated as a systemic disorder instead of only through the lens of mental and behavioural. The overview implications of included studies will be qualitatively analysed under ROBIS and GRADE tools. This umbrella review can provide a rational basis for a new urgent health policy to develop better and adequate integrated care services for ASD. The methodological protocol has the register CRD42022348586 at PROSPERO.
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Affiliation(s)
- Lara Teixeira Lopes
- Institute of Biomedical Sciences, University of Porto, 4099-030 Porto, Portugal
- Center of BioSciences in Integrative Health, 4200-355 Porto, Portugal
- Correspondence:
| | | | - Celeste Baccarin
- Center of BioSciences in Integrative Health, 4200-355 Porto, Portugal
| | - Kevin Oliveira
- Center of BioSciences in Integrative Health, 4200-355 Porto, Portugal
| | - Manuela Abreu
- Center of BioSciences in Integrative Health, 4200-355 Porto, Portugal
| | - Victor Ribeiro
- Center of BioSciences in Integrative Health, 4200-355 Porto, Portugal
| | - Zélia Caçador Anastácio
- Research Center on Child Studies, Institute of Education, University of Minho, 4804-533 Braga, Portugal
| | - Jorge Pereira Machado
- Institute of Biomedical Sciences, University of Porto, 4099-030 Porto, Portugal
- Center of BioSciences in Integrative Health, 4200-355 Porto, Portugal
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Amadi CN, Orish CN, Frazzoli C, Orisakwe OE. Association of autism with toxic metals: A systematic review of case-control studies. Pharmacol Biochem Behav 2021; 212:173313. [PMID: 34896416 DOI: 10.1016/j.pbb.2021.173313] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/16/2021] [Revised: 12/05/2021] [Accepted: 12/06/2021] [Indexed: 02/07/2023]
Abstract
Environmental factors have been associated with the etiology of autism spectrum disorder ASD in recent times. The involvement of toxic metals in the generation of reactive oxygen species and their epigenetics effects have been implicated in ASD. This systemic review examines the association of toxic metals with autism in children. A systematic literature search was performed in scientific databases such as PubMed, Google scholar, and Scopus. Case-control studies evaluating toxic metal levels in different tissues of ASD children and comparing them to healthy children (control group) were identified. The Newcastle-Ottawa Scale was used to evaluate the risk of bias of the included studies. Six case-control studies with 425 study subjects met our inclusion criteria. A total of four studies indicated higher levels of As, Pb, Hg, Cd, Al, Sn, Sb, Ba, TI, W, and Zr in whole blood, RBC, in whole blood, RBC, and hair samples of children with autism compared with control suggestive of a greater toxic metal exposure (immediate and long-term). Three studies identified significantly higher concentrations of Cd, Pb and Hg in urine and hair samples of autistic children compared to control suggesting decreased excretion and possible high body burden of these metals. The findings from this review demonstrate that high levels of toxic metals are associated with ASD, therefore, critical care is necessary to reduce body burden of these metals in children with ASD as a major therapeutic strategy.
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Affiliation(s)
- Cecilia N Amadi
- Department of Experimental Pharmacology & Toxicology, Faculty of Pharmacy, University of Port Harcourt, PMB, 5323 Port Harcourt, Choba, Nigeria
| | - Chinna N Orish
- Department of Anatomy, Faculty of Basic Medical Sciences, College of Health Sciences, University of Port Harcourt, PMB, 5323 Port Harcourt, Choba, Nigeria
| | - Chiara Frazzoli
- Department for Cardiovascular, Dysmetabolic and Aging Diseases, Istituto Superiore di Sanità, Rome, Italy
| | - Orish E Orisakwe
- Department of Experimental Pharmacology & Toxicology, Faculty of Pharmacy, University of Port Harcourt, PMB, 5323 Port Harcourt, Choba, Nigeria; African Centre of Excellence for Public Health and Toxicological Research (ACE-PUTOR), University of Port Harcourt, PMB, 5323 Port Harcourt, Choba, Nigeria.
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