1
|
Johansson Y, Awoga RA, Forsby A. Developmental neurotoxicity evaluation of acrylamide based on in vitro to in vivo extrapolation by pregnancy PBTK modelling. Toxicology 2024; 509:153950. [PMID: 39270965 DOI: 10.1016/j.tox.2024.153950] [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: 07/08/2024] [Revised: 08/27/2024] [Accepted: 09/07/2024] [Indexed: 09/15/2024]
Abstract
Acrylamide (ACR) is a known neurotoxicant that can pass the placenta and has been detected in breast milk. Some in vivo and in vitro studies indicate that ACR exposure might lead to developmental neurotoxicity (DNT). Here, we have developed a physiologically-based toxicokinetic model for a pregnant human population using PK-Sim. We performed an in vitro to in vivo extrapolation (IVIVE) of data collected from human neuroblastoma SH-SY5Y cells exposed during differentiation to ACR. The developed PBTK model was successfully evaluated and predicted fetal plasma concentrations in the low nM range after exposing the model to an estimated average daily intake for pregnant women. The IVIVE showed that low concentrations of ACR (fM-nM) that induced attenuated differentiation of the SH-SY5Y neuronal cell model, were relevant for human exposure to ACR from oral intake. However, doses estimated in the IVIVE from concentrations in the µM range, were found to be unrealistic by exposure through food intake for an average daily intake. However, in case of exposure due to environmental pollution or occupational exposure, these concentrations may be reached in fetal plasma. The findings in this study raise the concern regarding ACR exposure during pregnancy as well as the relevance of testing concentrations in vitro that are several orders of magnitude higher than the predicted fetal plasma concentrations.
Collapse
Affiliation(s)
- Ylva Johansson
- Department of Biochemistry and Biophysics, Stockholm University, Sweden
| | | | - Anna Forsby
- Department of Biochemistry and Biophysics, Stockholm University, Sweden
| |
Collapse
|
2
|
Grigio V, Guerra LHA, Silva SB, Freitas MB, Taboga SR, Vilamaior PSL. Coconut oil affects aging-related changes in Mongolian gerbil liver morphophysiology. J Nutr Biochem 2024:109749. [PMID: 39233189 DOI: 10.1016/j.jnutbio.2024.109749] [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: 03/26/2024] [Revised: 08/03/2024] [Accepted: 08/27/2024] [Indexed: 09/06/2024]
Abstract
Aging causes changes in liver morphophysiology, altering hepatocyte morphology and organ function. Due to its antioxidant and anti-inflammatory properties, coconut oil has been used as a therapeutic agent in diets, in an attempt to attenuate alterations in the liver naturally caused by aging. Herein, we evaluated the effects of coconut oil consumption during aging on Mongolian gerbil liver morphophysiology. The animals were divided into three experimental groups: the gerbils in the Adult Control Group (AC) were euthanized at 3 months of age, the gerbils in the Old Control Group (OC) at 15 months of age, and the gerbils in the Coconut Oil Group (CO) received 0.1 ml/day of coconut oil for 12 months and were euthanized at 15 months of age. Prolonged consumption of coconut oil during aging prevented the animals and the liver from gaining mass. However, the other results showed that coconut oil intensified the morphophysiological alterations of aging, promoting an increase in the hepatocyte cytoplasm and nuclei. In addition, an increase in blood vessels, reticular fibers, lipid droplets, and lipofuscin granules were observed in the CO group. Finally, the results also demonstrated that coconut oil promotes an increase in lipid peroxidation, indicated by an increase in MDA levels. We therefore conclude that coconut oil has the potential to intensify the morphophysiological alterations that occur in the liver during aging.
Collapse
Affiliation(s)
- Vitor Grigio
- Department of Biological Sciences, Institute of Biosciences, Humanities and Exact Sciences, São Paulo State University (UNESP), Campus São José do Rio Preto, São Paulo, Brazil
| | - Luiz Henrique Alves Guerra
- Department of Biological Sciences, Institute of Biosciences, Humanities and Exact Sciences, São Paulo State University (UNESP), Campus São José do Rio Preto, São Paulo, Brazil
| | - Stella Bicalho Silva
- Department of Biological Sciences, Institute of Biosciences, Humanities and Exact Sciences, São Paulo State University (UNESP), Campus São José do Rio Preto, São Paulo, Brazil; Department of Animal Biology, Federal University of Viçosa, Viçosa, Minas Gerais, Brazil
| | | | - Sebastião Roberto Taboga
- Department of Biological Sciences, Institute of Biosciences, Humanities and Exact Sciences, São Paulo State University (UNESP), Campus São José do Rio Preto, São Paulo, Brazil
| | - Patrícia Simone Leite Vilamaior
- Department of Biological Sciences, Institute of Biosciences, Humanities and Exact Sciences, São Paulo State University (UNESP), Campus São José do Rio Preto, São Paulo, Brazil.
| |
Collapse
|
3
|
Metabolism of versicolorin A, a genotoxic precursor of aflatoxin B1: Characterization of metabolites using in vitro production of standards. Food Chem Toxicol 2022; 167:113272. [PMID: 35803361 DOI: 10.1016/j.fct.2022.113272] [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: 04/20/2022] [Revised: 06/20/2022] [Accepted: 07/01/2022] [Indexed: 11/21/2022]
Abstract
The toxicity of mycotoxins containing bisfuranoid structures such as aflatoxin B1 (AFB1) depends largely on biotransformation processes. While the genotoxicity and mutagenicity of several bisfuranoid mycotoxins including AFB1 and sterigmatocystin have been linked to in vivo bioactivation of these molecules into reactive epoxide forms, the metabolites of genotoxic and mutagenic AFB1 precursor versicolorin A (VerA) have not yet been characterized. Because this molecule is not available commercially, our strategy was to produce a library of metabolites derived from the biotransformation of in-house purified VerA, following incubation with human liver S9 fractions, in presence of appropriate cofactors. The resulting chromatographic and mass-spectrometric data were used to identify VerA metabolites produced by intestinal cell lines as well as intestinal and liver tissues exposed ex vivo. In this way, we obtained a panel of metabolites suggesting the involvement of phase I (M + O) and phase II (glucuronide and sulfate metabolites) enzymes, the latter of which is implicated in the detoxification process. This first qualitative description of the metabolization products of VerA suggests bioactivation of the molecule into an epoxide form and provides qualitative analytic data to further conduct a precise metabolism study of VerA required for the risk assessment of this emerging mycotoxin.
Collapse
|
4
|
Liu A, Li X, Hao Z, Cao J, Li H, Sun M, Zhang Z, Liang R, Zhang H. Alterations of DNA methylation and mRNA levels of CYP1A1, GSTP1, and GSTM1 in human bronchial epithelial cells induced by benzo[a]pyrene. Toxicol Ind Health 2022; 38:127-138. [PMID: 35193440 DOI: 10.1177/07482337211069233] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Benzo[a]pyrene (B[a]P) is a known human carcinogen and plays a major function in the initiation of lung cancer at its first proximity. However, the underlying molecular mechanisms are less well understood. In this study, we investigated the impact of B[a]P treatment on the DNA methylation and mRNA levels of CYP1A1, GSTP1, and GSTM1 in human bronchial epithelial cells (16HBEs), and provide scientific evidence for the mechanism study on the carcinogenesis of B[a]P. We treated 16HBEs with DMSO or concentrations of B[a]P at 1, 2, and 5 mmol/L for 24 h, observed the morphological changes, determined the cell viability, DNA methylation, and mRNA levels of CYP1A1, GSTP1, and GSTM1. Compared to the DMSO controls, B[a]P treatment had significantly increased the neoplastic cell number and cell viability in 16HBEs at all three doses (1, 2, and 5 mmol/L), and had significantly reduced the CYP1A1 and GSTP1 DNA promoter methylation levels. Following B[a]P treatment, the GSTM1 promoter methylation level in 16HBEs was profoundly reduced at low dose group compared to the DMSO controls, yet it was significantly increased at both middle and high dose groups. The mRNA levels of CYP1A1, GSTP1, and GSTM1 were significantly decreased in 16HBEs following B[a]P treatment at all three doses. The findings demonstrate that B[a]P promoted cell proliferation in 16HBEs, which was possibly related to the altered DNA methylations and the inhibited mRNA levels in CYP1A1, GSTP1, and GSTM1.
Collapse
Affiliation(s)
- Aixiang Liu
- Department of Environmental Health, School of Public Health, 74648Shanxi Medical University, Taiyuan, Shanxi, China.,Department of Health Information Management, 74648Shanxi Medical University Fenyang College, Fenyang, Shanxi, China
| | - Xin Li
- Center of Disease Control and Prevention, 442190Taiyuan Iron and Steel Co Ltd, Taiyuan, Shanxi, China
| | - Zhongsuo Hao
- Department of Environmental Health, School of Public Health, 74648Shanxi Medical University, Taiyuan, Shanxi, China
| | - Jingjing Cao
- Department of Environmental Health, School of Public Health, 74648Shanxi Medical University, Taiyuan, Shanxi, China
| | - Huan Li
- Department of Environmental Health, School of Public Health, 74648Shanxi Medical University, Taiyuan, Shanxi, China
| | - Min Sun
- Department of Environmental Health, School of Public Health, 74648Shanxi Medical University, Taiyuan, Shanxi, China
| | - Zhihong Zhang
- Department of Environmental Health, School of Public Health, 74648Shanxi Medical University, Taiyuan, Shanxi, China
| | - Ruifeng Liang
- Department of Environmental Health, School of Public Health, 74648Shanxi Medical University, Taiyuan, Shanxi, China
| | - Hongmei Zhang
- Department of Environmental Health, School of Public Health, 74648Shanxi Medical University, Taiyuan, Shanxi, China
| |
Collapse
|
5
|
Le TH. GSTM1 Gene, Diet, and Kidney Disease: Implication for Precision Medicine?: Recent Advances in Hypertension. Hypertension 2021; 78:936-945. [PMID: 34455814 DOI: 10.1161/hypertensionaha.121.16510] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
In the United States, the prevalence of chronic kidney disease in adults is ≈14%. The mainstay of therapy for chronic kidney disease is angiotensin-converting enzyme inhibitors or angiotensin receptor blockers, but many patients with chronic kidney disease still progress to end-stage kidney disease. Increased oxidative stress is a major molecular underpinning of chronic kidney disease progression. In humans, a common deletion variant of the glutathione-S-transferase μ-1 (GSTM1) gene, the GSTM1 null allele (GSTM1(0)), results in decreased GSTM1 enzymatic activity and is associated with higher levels of oxidative stress. GSTM1 belongs to the superfamily of GSTs that are phase II antioxidant enzymes and are regulated by Nrf2 (nuclear factor erythroid 2-related factor 2). Cruciferous vegetables in general, and broccoli in particular, are rich in glucoraphanin, a precursor of sulforaphane that has been shown to have protective effects against oxidative damage through the activation of Nrf2. This review will highlight recent human and animal studies implicating the role of GSTM1 deficiency in hypertension and kidney disease, and its impact on the effects of cruciferous vegetables on kidney injury and disease progression, illustrating the significance of gene and environment interaction and a potential for targeted precision medicine in the treatment of kidney disease.
Collapse
Affiliation(s)
- Thu H Le
- Division of Nephrology, Department of Medicine, University of Rochester Medical Center, NY
| |
Collapse
|
6
|
Zhang W, Gao J, Lu L, Bold T, Li X, Wang S, Chang Z, Chen J, Kong X, Zheng Y, Zhang M, Tang J. Intracellular GSH/GST antioxidants system change as an earlier biomarker for toxicity evaluation of iron oxide nanoparticles. NANOIMPACT 2021; 23:100338. [PMID: 35559839 DOI: 10.1016/j.impact.2021.100338] [Citation(s) in RCA: 29] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/16/2021] [Revised: 06/14/2021] [Accepted: 06/18/2021] [Indexed: 05/14/2023]
Abstract
Glutathione (GSH) and glutathione-S-transferases (GSTs) are two frontlines of cellular defense against both acute and chronic toxicity of xenobiotics-induced oxidative stress. The contribution of GSH and GST enzymes to signaling pathways and the regulation of GSH homeostasis play a central role in the detoxification of numerous environmental toxins and impurities. Iron oxide nanoparticles stemmed from traffic exhaust, steel manufacturing, or welding as a potential environmental pollution can lead to adverse respiratory outcomes and aggravate the risk of chronic health conditions via persistent oxidative stress. In this work, two kinds of acute exposure experiments of iron oxide (Fe2O3 and Fe3O4) nanoparticles in cells and in vivo were conducted to evaluate the GSH levels and GST activity. Our current research presented Fe3O4 nanoparticles at lower concentrations (≤100 μg/ml) seem to be more toxic to the human bronchial epithelial cells as their consumption of GSH and decrease of GST activity. The catalysis activity of Fe3O4 nanoparticles per se may contribute to the intracellular GSH consumption along with inhibition of glutathione-S-transferase class mu 1 and P (GSTM1 and GSTP1) active site and expression decrease of GSTM1 and GSTP1. Accordingly, the GSH consumption and decrease in GST activity directed to the further lipid peroxidation regarded as an earlier marker for toxicity evaluation of iron oxide nanoparticles, and relevant intervention may be effective for prevention of respiratory exposure induced damage from iron oxide nanoparticles.
Collapse
Affiliation(s)
- Wanjun Zhang
- Departmental of Occupational and Environmental Health, School of Public Health, Qingdao University, Qingdao 266071, China
| | - Jinling Gao
- Departmental of Occupational and Environmental Health, School of Public Health, Qingdao University, Qingdao 266071, China; Department of Infection Management Service, Dushu Lake Hospital Affiliated of Soochow University, Suzhou 215000, China
| | - Lin Lu
- Departmental of Occupational and Environmental Health, School of Public Health, Qingdao University, Qingdao 266071, China
| | - Tsendmaa Bold
- Departmental of Occupational and Environmental Health, School of Public Health, Qingdao University, Qingdao 266071, China
| | - Xin Li
- Departmental of Occupational and Environmental Health, School of Public Health, Qingdao University, Qingdao 266071, China
| | - Shuo Wang
- Departmental of Occupational and Environmental Health, School of Public Health, Qingdao University, Qingdao 266071, China
| | - Zhishang Chang
- Departmental of Occupational and Environmental Health, School of Public Health, Qingdao University, Qingdao 266071, China
| | - Jing Chen
- Departmental of Occupational and Environmental Health, School of Public Health, Qingdao University, Qingdao 266071, China
| | - Xiao Kong
- Departmental of Occupational and Environmental Health, School of Public Health, Qingdao University, Qingdao 266071, China
| | - Yuxin Zheng
- Departmental of Occupational and Environmental Health, School of Public Health, Qingdao University, Qingdao 266071, China
| | - Mingliang Zhang
- Tianjin Key Laboratory of Retinal Functions and Diseases, Tianjin Branch of National Clinical Research Center for Ocular Disease, Eye Institute and School of Optometry, Tianjin Medical University Eye Hospital, Tianjin 300384, China.
| | - Jinglong Tang
- Departmental of Occupational and Environmental Health, School of Public Health, Qingdao University, Qingdao 266071, China.
| |
Collapse
|
7
|
Zivkovic M, Bubic M, Kolakovic A, Dekleva M, Stankovic G, Stankovic A, Djuric T. The association of glutathione S-transferase T1 and M1 deletions with myocardial infarction. Free Radic Res 2021; 55:267-274. [PMID: 34003050 DOI: 10.1080/10715762.2021.1931166] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
Glutathione S-transferases (GSTs) are the family of enzymes involved in the second line of defense against oxidative stress (OS). The lack of GSTT1/GSTM1 enzyme quantity or activity, due to the presence of homozygous deletion compromises antioxidative defense resulting in OS. OS is the critical mechanism in the pathophysiology of atherosclerosis, coronary artery disease, and myocardial infarction (MI). The increase in reactive oxygen species together with the process of apoptosis plays a role in left ventricular remodeling (LVR) after MI. The associations of GSTT1 and GSTM1 gene polymorphisms with the risk of MI are inconsistent. The aim was to analyze the association of GSTT1/GSTM1 null genotypes with first MI and LVR 8 months after the MI. The study involved 330 controls and 438 consecutive patients with symptoms and signs of first MI. The subgroup of 150 MI patients was prospectively followed up for 6 months. Evidence of maladaptive LVR was obtained by 2D Doppler echocardiography 3-5 days and 6 months after the MI. A multiplex polymerase chain reaction was used to detect the deletion in GSTT1 and GSTM1 genes. GSTM1 null genotype was significantly and independently associated with first MI (adjusted OR = 1.45 95% CI 1.03-2.03, p = 0.03). Association of double null genotypes with maladaptive LVR in patients 6 months after the first MI was no longer significant after adjustment for factors that differed significantly between patients with and without maladaptive LVR. This study demonstrated the association of GSTM1 null genotypes with the risk of MI in the Serbian population.
Collapse
Affiliation(s)
- Maja Zivkovic
- Department of Radiobiology and Molecular Genetics, "Vinca" Institute of Nuclear Sciences - National Institute of the Republic of Serbia, University of Belgrade, Belgrade, Serbia
| | - Maja Bubic
- Department of Radiobiology and Molecular Genetics, "Vinca" Institute of Nuclear Sciences - National Institute of the Republic of Serbia, University of Belgrade, Belgrade, Serbia
| | - Ana Kolakovic
- Department of Radiobiology and Molecular Genetics, "Vinca" Institute of Nuclear Sciences - National Institute of the Republic of Serbia, University of Belgrade, Belgrade, Serbia
| | - Milica Dekleva
- Department of Cardiology, University Clinical Center "Zvezdara", Belgrade, Serbia.,Faculty of Medicine, University of Belgrade, Belgrade, Serbia
| | - Goran Stankovic
- Faculty of Medicine, University of Belgrade, Belgrade, Serbia.,Cardiology Clinic, Clinical Center of Serbia, Belgrade, Serbia
| | - Aleksandra Stankovic
- Department of Radiobiology and Molecular Genetics, "Vinca" Institute of Nuclear Sciences - National Institute of the Republic of Serbia, University of Belgrade, Belgrade, Serbia
| | - Tamara Djuric
- Department of Radiobiology and Molecular Genetics, "Vinca" Institute of Nuclear Sciences - National Institute of the Republic of Serbia, University of Belgrade, Belgrade, Serbia
| |
Collapse
|
8
|
Reis M, Willis GR, Fernandez-Gonzalez A, Yeung V, Taglauer E, Magaletta M, Parsons T, Derr A, Liu X, Maehr R, Kourembanas S, Mitsialis SA. Mesenchymal Stromal Cell-Derived Extracellular Vesicles Restore Thymic Architecture and T Cell Function Disrupted by Neonatal Hyperoxia. Front Immunol 2021; 12:640595. [PMID: 33936055 PMCID: PMC8082426 DOI: 10.3389/fimmu.2021.640595] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2020] [Accepted: 03/24/2021] [Indexed: 11/28/2022] Open
Abstract
Treating premature infants with high oxygen is a routine intervention in the context of neonatal intensive care. Unfortunately, the increase in survival rates is associated with various detrimental sequalae of hyperoxia exposure, most notably bronchopulmonary dysplasia (BPD), a disease of disrupted lung development. The effects of high oxygen exposure on other developing organs of the infant, as well as the possible impact such disrupted development may have on later life remain poorly understood. Using a neonatal mouse model to investigate the effects of hyperoxia on the immature immune system we observed a dramatic involution of the thymic medulla, and this lesion was associated with disrupted FoxP3+ regulatory T cell generation and T cell autoreactivity. Significantly, administration of mesenchymal stromal cell-derived extracellular vesicles (MEx) restored thymic medullary architecture and physiological thymocyte profiles. Using single cell transcriptomics, we further demonstrated preferential impact of MEx treatment on the thymic medullary antigen presentation axis, as evidenced by enrichment of antigen presentation and antioxidative-stress related genes in dendritic cells (DCs) and medullary epithelial cells (mTECs). Our study demonstrates that MEx treatment represents a promising restorative therapeutic approach for oxygen-induced thymic injury, thus promoting normal development of both central tolerance and adaptive immunity.
Collapse
Affiliation(s)
- Monica Reis
- Division of Newborn Medicine & Department of Pediatrics, Boston Children's Hospital, Boston, MA, United States.,Department of Pediatrics, Harvard Medical School, Boston, MA, United States
| | - Gareth R Willis
- Division of Newborn Medicine & Department of Pediatrics, Boston Children's Hospital, Boston, MA, United States.,Department of Pediatrics, Harvard Medical School, Boston, MA, United States
| | - Angeles Fernandez-Gonzalez
- Division of Newborn Medicine & Department of Pediatrics, Boston Children's Hospital, Boston, MA, United States.,Department of Pediatrics, Harvard Medical School, Boston, MA, United States
| | - Vincent Yeung
- Division of Newborn Medicine & Department of Pediatrics, Boston Children's Hospital, Boston, MA, United States.,Department of Pediatrics, Harvard Medical School, Boston, MA, United States
| | - Elizabeth Taglauer
- Division of Newborn Medicine & Department of Pediatrics, Boston Children's Hospital, Boston, MA, United States.,Department of Pediatrics, Harvard Medical School, Boston, MA, United States
| | - Margaret Magaletta
- Program in Molecular Medicine, Diabetes Center of Excellence, University of Massachusetts Medical School, Worcester, MA, United States
| | - Teagan Parsons
- Program in Molecular Medicine, Diabetes Center of Excellence, University of Massachusetts Medical School, Worcester, MA, United States
| | - Alan Derr
- Program in Molecular Medicine, Diabetes Center of Excellence, University of Massachusetts Medical School, Worcester, MA, United States
| | - Xianlan Liu
- Division of Newborn Medicine & Department of Pediatrics, Boston Children's Hospital, Boston, MA, United States.,Department of Pediatrics, Harvard Medical School, Boston, MA, United States
| | - Rene Maehr
- Program in Molecular Medicine, Diabetes Center of Excellence, University of Massachusetts Medical School, Worcester, MA, United States
| | - Stella Kourembanas
- Division of Newborn Medicine & Department of Pediatrics, Boston Children's Hospital, Boston, MA, United States.,Department of Pediatrics, Harvard Medical School, Boston, MA, United States
| | - S Alex Mitsialis
- Division of Newborn Medicine & Department of Pediatrics, Boston Children's Hospital, Boston, MA, United States.,Department of Pediatrics, Harvard Medical School, Boston, MA, United States
| |
Collapse
|
9
|
Breedon SA, Hadj-Moussa H, Storey KB. Nrf2 activates antioxidant enzymes in the anoxia-tolerant red-eared slider turtle, Trachemys scripta elegans. JOURNAL OF EXPERIMENTAL ZOOLOGY PART 2021; 335:426-435. [PMID: 33773070 DOI: 10.1002/jez.2458] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/23/2020] [Revised: 02/26/2021] [Accepted: 03/13/2021] [Indexed: 12/30/2022]
Abstract
The freshwater red-eared slider turtle, Trachemys scripta elegans, experiences weeks to months of anoxia at the bottom of ice-locked bodies of water in the winter. While this introduces anoxia-reoxygenation cycles similar to the ischemia-reperfusion events that mammals experience, T. s. elegans does not suffer any apparent tissue damage. To survive prolonged anoxia and prevent cellular damage associated with reactive oxygen species, these turtles have developed numerous adaptions, including highly effective antioxidant defenses. Herein, we examined the subcellular localization and protein expression of nuclear factor erythroid-2-related factor 2 (Nrf2), a central transcription factor responsible for modulating cellular antioxidant responses, that was found to be upregulated and localized to the nucleus in anoxic turtles. Additionally, we examined protein levels of glutathione S-transferases (GSTs) and manganese superoxide dismutase (MnSOD) antioxidant enzymes in anoxic liver, kidney, heart, and skeletal muscle tissues. MnSOD levels were significantly higher in heart and muscle during anoxia, and the four GST isozymes (GSTK1, GSTT1, GSTP1, and GSTM3) were elevated in a tissue-specific manner during anoxia and/or aerobic recovery. Together, these results indicate that Nrf2 is likely involved in activating downstream antioxidant genes in response to anoxic stress. These results provide a possible Nrf2-mediated transcriptional mechanism that supports existing findings of enhanced antioxidant defenses that allow T. s. elegans to cope with anoxia-reoxygenation cycles, and subsequent oxidative stress.
Collapse
Affiliation(s)
- Sarah A Breedon
- Department of Biology, Institute of Biochemistry, Carleton University, Ottawa, Ontario, Canada
| | - Hanane Hadj-Moussa
- Department of Biology, Institute of Biochemistry, Carleton University, Ottawa, Ontario, Canada
| | - Kenneth B Storey
- Department of Biology, Institute of Biochemistry, Carleton University, Ottawa, Ontario, Canada
| |
Collapse
|
10
|
Lindeman B, Johansson Y, Andreassen M, Husøy T, Dirven H, Hofer T, Knutsen HK, Caspersen IH, Vejrup K, Paulsen RE, Alexander J, Forsby A, Myhre O. Does the food processing contaminant acrylamide cause developmental neurotoxicity? A review and identification of knowledge gaps. Reprod Toxicol 2021; 101:93-114. [PMID: 33617935 DOI: 10.1016/j.reprotox.2021.02.006] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2020] [Revised: 01/11/2021] [Accepted: 02/16/2021] [Indexed: 12/15/2022]
Abstract
There is a worldwide concern on adverse health effects of dietary exposure to acrylamide (AA) due to its presence in commonly consumed foods. AA is formed when carbohydrate rich foods containing asparagine and reducing sugars are prepared at high temperatures and low moisture conditions. Upon oral intake, AA is rapidly absorbed and distributed to all organs. AA is a known human neurotoxicant that can reach the developing foetus via placental transfer and breast milk. Although adverse neurodevelopmental effects have been observed after prenatal AA exposure in rodents, adverse effects of AA on the developing brain has so far not been studied in humans. However, epidemiological studies indicate that gestational exposure to AA impair foetal growth and AA exposure has been associated with reduced head circumference of the neonate. Thus, there is an urgent need for further research to elucidate whether pre- and perinatal AA exposure in humans might impair neurodevelopment and adversely affect neuronal function postnatally. Here, we review the literature with emphasis on the identification of critical knowledge gaps in relation to neurodevelopmental toxicity of AA and its mode of action and we suggest research strategies to close these gaps to better protect the unborn child.
Collapse
Affiliation(s)
- Birgitte Lindeman
- Department of Environmental Health, Norwegian Institute of Public Health, Oslo, Norway
| | - Ylva Johansson
- Department of Biochemistry and Biophysics, Stockholm University, Stockholm, Sweden
| | - Mathilda Andreassen
- Department of Biochemistry and Biophysics, Stockholm University, Stockholm, Sweden
| | - Trine Husøy
- Department of Environmental Health, Norwegian Institute of Public Health, Oslo, Norway
| | - Hubert Dirven
- Department of Environmental Health, Norwegian Institute of Public Health, Oslo, Norway
| | - Tim Hofer
- Department of Environmental Health, Norwegian Institute of Public Health, Oslo, Norway
| | - Helle K Knutsen
- Department of Environmental Health, Norwegian Institute of Public Health, Oslo, Norway
| | - Ida H Caspersen
- Centre for Fertility and Health, Norwegian Institute of Public Health, Oslo, Norway
| | - Kristine Vejrup
- Department of Environmental Health, Norwegian Institute of Public Health, Oslo, Norway
| | - Ragnhild E Paulsen
- Section for Pharmacology and Pharmaceutical Biosciences, Department of Pharmacy, University of Oslo, Norway
| | - Jan Alexander
- Department of Environmental Health, Norwegian Institute of Public Health, Oslo, Norway
| | - Anna Forsby
- Department of Biochemistry and Biophysics, Stockholm University, Stockholm, Sweden
| | - Oddvar Myhre
- Department of Environmental Health, Norwegian Institute of Public Health, Oslo, Norway.
| |
Collapse
|
11
|
Cruz-Valencia R, Arvizu-Flores AA, Rosas-Rodríguez JA, Valenzuela-Soto EM. Effect of the drug cyclophosphamide on the activity of porcine kidney betaine aldehyde dehydrogenase. Mol Cell Biochem 2021; 476:1467-1475. [PMID: 33389495 DOI: 10.1007/s11010-020-04010-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2020] [Accepted: 11/28/2020] [Indexed: 01/17/2023]
Abstract
The enzyme betaine aldehyde dehydrogenase (BADH EC 1.2.1.8) catalyzes the synthesis of glycine betaine (GB), an osmolyte and osmoprotectant. Also, it participates in several metabolic pathways in humans. All BADHs known have cysteine in the active site involved in the aldehyde binding, whereas the porcine kidney enzyme (pkBADH) also has a neighborhood cysteine, both sensitive to oxidation. The antineoplastic and immuno-suppressant pre-drug cyclophosphamide (CTX), and its bioactivation products, have two highly oxidating chlorine atoms. This work aimed to analyze the effect of CTX in the activity of porcine kidney betaine aldehyde dehydrogenase. PkBADH was incubated with varying CTX concentration (0 to 2.0 mM) at 25 °C and lost 50 % of its activity with 2.0 mM CTX. The presence of the coenzyme NAD+ (0.5 mM) decreased 95% the activity in 2.0 mM CTX. The substrate betaine aldehyde (0.05 and 0.4 mM, and the products NADH (0.1-0.5 mM) and GB (1 and 10 mM) did not have an effect on the enzyme inactivation by CTX. The reducing agents, dithiothreitol and β-mercaptoethanol, reverted the pkBADH inactivation, but reduced glutathione (GSH) was unable to restore the enzyme activity. Molecular docking showed that CTX could enter at the enzyme active site, where its chlorine atoms may interact with the catalytic and the neighboring cysteines. The results obtained show that CTX inactivates the pkBADH due to oxidation of the catalytic cysteine or because it oxidizes catalytic and neighborhood cysteine, forming a disulfide bridge with a concomitant decrease in the activity of the enzyme.
Collapse
Affiliation(s)
- Ramses Cruz-Valencia
- Centro de Investigación en Alimentación y Desarrollo A.C., Hermosillo, 83304, Sonora, México
| | - Aldo A Arvizu-Flores
- Departamento de Ciencias Químico-Biológicas, Universidad de Sonora, Hermosillo, 83000, Sonora, México
| | - Jesús A Rosas-Rodríguez
- Departamento de Ciencias, Químico Biológicas y Agropecuarias, Universidad de Sonora Unidad Regional Sur, Navojoa, 85880, Sonora, México
| | - Elisa M Valenzuela-Soto
- Centro de Investigación en Alimentación y Desarrollo A.C., Hermosillo, 83304, Sonora, México.
| |
Collapse
|
12
|
Highly Efficient Synthesis of Glutathione via a Genetic Engineering Enzymatic Method Coupled with Yeast ATP Generation. Catalysts 2019. [DOI: 10.3390/catal10010033] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Glutathione is a tripeptide compound with many important physiological functions. A new, two-step reaction system has been developed to efficiently synthesize glutathione. In the first step, glutamate and cysteine are condensed to glutamyl-cysteine by endogenous yeast enzymes inside the yeast cell, while consuming ATP. In the second step, the yeast cell membrane is lysed by the permeabilizing agent CTAB (cetyltrimethylammonium bromide) to release the glutamyl-cysteine, upon which added glutathione synthetase converts the glutamyl-cysteine and added glycine into glutathione. The ATP needed for this conversion is supplied by the permeabilized yeast cells of glycolytic pathway. This method provided sufficient ATP, and reduced the feedback inhibition of glutathione for the first-step enzymatic reaction, thereby improving the catalytic efficiency of the enzyme reaction. In addition, the formation of suitable oxidative stress environment in the reaction system can further promote glutathione synthesis. By HPLC analysis of the glutathione, it was found that 2.1 g/L reduced glutathione is produced and 17.5 g/L oxidized glutathione. Therefore, the new reaction system not only increases the total glutathione, but also facilitates the subsequent separation and purification due to the larger proportion of oxidized glutathione in the reaction system.
Collapse
|