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Hansson E, Jakobsson K, Glaser JR, Wesseling C, Chavarria D, Lucas RAI, Prince H, Wegman DH. Response to: Letter to the Editor-Productivity as an efficacy measure in rest-shade-hydration interventions: the need for a more complete dissemination and implementation science approach by Dally M and Newman LS. Ann Work Expo Health 2024; 68:668-671. [PMID: 38829828 DOI: 10.1093/annweh/wxae046] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2024] [Indexed: 06/05/2024] Open
Affiliation(s)
- Erik Hansson
- La Isla Network, 2219 California NW Unit 52, 20008 Washington, District of Columbia, United States
- Occupational and Environmental Medicine, School of Public Health and Community Medicine, Sahlgrenska Academy, University of Gothenburg, Box 414, 40530 Gothenburg, Sweden
| | - Kristina Jakobsson
- La Isla Network, 2219 California NW Unit 52, 20008 Washington, District of Columbia, United States
- Occupational and Environmental Medicine, School of Public Health and Community Medicine, Sahlgrenska Academy, University of Gothenburg, Box 414, 40530 Gothenburg, Sweden
- Occupational and Environmental Medicine, Sahlgrenska University Hospital, Box 414, 40530 Gothenburg, Sweden
| | - Jason R Glaser
- La Isla Network, 2219 California NW Unit 52, 20008 Washington, District of Columbia, United States
| | - Catharina Wesseling
- La Isla Network, 2219 California NW Unit 52, 20008 Washington, District of Columbia, United States
- Unit of Occupational Medicine, Institute of Environmental Medicine, Karolinska Institute, Box 210, 171 77 Stockholm, Sweden
| | - Denis Chavarria
- Occupational Health Management, Ingenio San Antonio/Nicaragua Sugar Estates Limited, Km. 119 Carretera León-Chinandega, Chichigalpa, Nicaragua
| | - Rebekah A I Lucas
- La Isla Network, 2219 California NW Unit 52, 20008 Washington, District of Columbia, United States
- School of Sport, Exercise and Rehabilitation Sciences, University of Birmingham, Birmingham B15 2TT, United Kingdom
| | - Heath Prince
- La Isla Network, 2219 California NW Unit 52, 20008 Washington, District of Columbia, United States
- LBJ School of Public Affairs, University of Texas at Austin, 2315 Red River St, Austin, TX 78712, United States
| | - David H Wegman
- La Isla Network, 2219 California NW Unit 52, 20008 Washington, District of Columbia, United States
- University of Massachusetts Lowell, 1 University Avenue, Lowell, MA 01854, United States
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Stem AD, Rogers KL, Roede JR, Roncal-Jimenez CA, Johnson RJ, Brown JM. Sugarcane ash and sugarcane ash-derived silica nanoparticles alter cellular metabolism in human proximal tubular kidney cells. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2023; 332:121951. [PMID: 37301454 PMCID: PMC10321436 DOI: 10.1016/j.envpol.2023.121951] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/18/2023] [Revised: 05/30/2023] [Accepted: 06/01/2023] [Indexed: 06/12/2023]
Abstract
Multiple epidemics of chronic kidney disease of an unknown etiology (CKDu) have emerged in agricultural communities around the world. Many factors have been posited as potential contributors, but a primary cause has yet to be identified and the disease is considered likely multifactorial. Sugarcane workers are largely impacted by disease leading to the hypothesis that exposure to sugarcane ash produced during the burning and harvest of sugarcane could contribute to CKDu. Estimated exposure levels of particles under 10 μm (PM10) have been found to be exceptionally high during this process, exceeding 100 μg/m3 during sugarcane cutting and averaging ∼1800 μg/m3 during pre-harvest burns. Sugarcane stalks consist of ∼80% amorphous silica and generate nano-sized silica particles (∼200 nm) following burning. A human proximal convoluted tubule (PCT) cell line was subjected to treatments ranging in concentration from 0.025 μg/mL to 25 μg/mL of sugarcane ash, desilicated sugarcane ash, sugarcane ash-derived silica nanoparticles (SAD SiNPs) or manufactured pristine 200 nm silica nanoparticles. The combination of heat stress and sugarcane ash exposure on PCT cell responses was also assessed. Following 6-48 h of exposure, mitochondrial activity and viability were found to be significantly reduced when exposed to SAD SiNPs at concentrations 2.5 μg/mL or higher. Oxygen consumption rate (OCR) and pH changes suggested significant alteration to cellular metabolism across treatments as early as 6 h following exposure. SAD SiNPs were found to inhibit mitochondrial function, reduce ATP generation, increase reliance on glycolysis, and reduce glycolytic reserve. Metabolomic analysis revealed several cellular energetics pathways (e.g., fatty acid metabolism, glycolysis, and TCA cycle) are significantly altered across ash-based treatments. Heat stress did not influence these responses. Such changes indicate that exposure to sugarcane ash and its derivatives can promote mitochondrial dysfunction and disrupt metabolic activity of human PCT cells.
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Affiliation(s)
- Arthur D Stem
- Department of Pharmaceutical Sciences, University of Colorado Anschutz Medical Campus, Aurora, CO, USA
| | - Keegan L Rogers
- Department of Pharmaceutical Sciences, University of Colorado Anschutz Medical Campus, Aurora, CO, USA
| | - James R Roede
- Department of Pharmaceutical Sciences, University of Colorado Anschutz Medical Campus, Aurora, CO, USA
| | - Carlos A Roncal-Jimenez
- Division of Renal Diseases and Hypertension, University of Colorado Anschutz Medical Campus, Aurora, CO, USA
| | - Richard J Johnson
- Division of Renal Diseases and Hypertension, University of Colorado Anschutz Medical Campus, Aurora, CO, USA.
| | - Jared M Brown
- Department of Pharmaceutical Sciences, University of Colorado Anschutz Medical Campus, Aurora, CO, USA.
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Madero M. Is an Environmental Nephrotoxin the Primary Cause of CKDu (Mesoamerican Nephropathy)? Commentary. KIDNEY360 2020; 1:602-603. [PMID: 35378017 PMCID: PMC8815559 DOI: 10.34067/kid.0003412020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/27/2020] [Accepted: 05/28/2020] [Indexed: 06/14/2023]
Affiliation(s)
- Magdalena Madero
- Division of Nephrology, Instituto Nacional de Cardiologia, Mexico City, Mexico
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