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Li X, Long J, Yao C, Liu X, Li N, Zhou Y, Li D, Xiong G, Wang K, Hao Y, Chen K, Zhou Z, Ji A, Luo P, Cai T. The role of BTG2/PI3K/AKT pathway-mediated microglial activation in T-2 toxin-induced neurotoxicity. Toxicol Lett 2024; 400:81-92. [PMID: 39147216 DOI: 10.1016/j.toxlet.2024.08.003] [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: 11/30/2023] [Revised: 07/07/2024] [Accepted: 08/01/2024] [Indexed: 08/17/2024]
Abstract
T-2 toxin is one of the mycotoxins widely distributed in human food and animal feed. Our recent work has shown that microglial activation may contribute to T-2 toxin-induced neurotoxicity. However, the molecular mechanisms involved need to be further clarified. To address this, we employed high-throughput transcriptome sequencing and found altered B cell translocation gene 2 (BTG2) expression levels in microglia following T-2 toxin treatment. It has been shown that altered BTG2 expression is involved in a range of neurological pathologies, but whether it's involved in the regulation of microglial activation is unclear. The aim of this study was to investigate the role of BTG2 in T-2 toxin-induced microglial activation. The results of animal experiments showed that T-2 toxin caused neurobehavioral disorders and promoted the expression of microglial BTG2 and pro-inflammatory activation of microglia in hippocampus and cortical, while microglial inhibitor minocycline inhibited these changes. The results of in vitro experiments showed that T-2 toxin enhanced BTG2 expression and pro-inflammatory microglial activation, and inhibited BTG2 expression weakened T-2 toxin-induced microglial activation. Moreover, T-2 toxin activated PI3K/AKT and its downstream NF-κB signaling pathway, which could be reversed after knock-down of BTG2 expression. Meanwhile, the PI3K inhibitor LY294002 also blocked this process. Therefore, BTG2 may be involved in T-2 toxin's ability to cause microglial activation through PI3K/AKT/NF-κB pathway.
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Affiliation(s)
- Xiukuan Li
- School of Public Health, the key Laboratory of Environmental Pollution Monitoring and Disease Control, Ministry of Education, Guizhou Medical University, Guiyang 561113, China; Department of Epidemiology, College of Preventive Medicine, State Key Laboratory of Trauma and Chemical Poisoning, Army Medical University (Third Military Medical University), Chongqing 400038, China
| | - Jinyun Long
- School of Public Health, the key Laboratory of Environmental Pollution Monitoring and Disease Control, Ministry of Education, Guizhou Medical University, Guiyang 561113, China; Department of Epidemiology, College of Preventive Medicine, State Key Laboratory of Trauma and Chemical Poisoning, Army Medical University (Third Military Medical University), Chongqing 400038, China
| | - Chunyan Yao
- Department of Epidemiology, College of Preventive Medicine, State Key Laboratory of Trauma and Chemical Poisoning, Army Medical University (Third Military Medical University), Chongqing 400038, China
| | - Xiaoling Liu
- Department of Epidemiology, College of Preventive Medicine, State Key Laboratory of Trauma and Chemical Poisoning, Army Medical University (Third Military Medical University), Chongqing 400038, China
| | - Na Li
- Chongqing Yongchuan District Center for Disease Control and Prevention, Chongqing 402160, China
| | - Yumeng Zhou
- Department of Epidemiology, College of Preventive Medicine, State Key Laboratory of Trauma and Chemical Poisoning, Army Medical University (Third Military Medical University), Chongqing 400038, China
| | - Dawei Li
- Department of Epidemiology, College of Preventive Medicine, State Key Laboratory of Trauma and Chemical Poisoning, Army Medical University (Third Military Medical University), Chongqing 400038, China
| | - Guiyuan Xiong
- School of Public Health, the key Laboratory of Environmental Pollution Monitoring and Disease Control, Ministry of Education, Guizhou Medical University, Guiyang 561113, China; Department of Epidemiology, College of Preventive Medicine, State Key Laboratory of Trauma and Chemical Poisoning, Army Medical University (Third Military Medical University), Chongqing 400038, China
| | - Kexue Wang
- Department of Epidemiology, College of Preventive Medicine, State Key Laboratory of Trauma and Chemical Poisoning, Army Medical University (Third Military Medical University), Chongqing 400038, China
| | - Yuhui Hao
- State Key Laboratory of Trauma, Burns and Combined Injury, Institute of Combined Injury, Chongqing Engineering Research Center for Nanomedicine, College of Preventive Medicine, Army Medical University (Third Military Medical University), Chongqing 400038, China
| | - Ka Chen
- Research Center for Nutrition and Food Safety, Institute of Military Preventive Medicine, Army Medical University (Third Military Medical University), Chongqing 400038, China
| | - Ziyuan Zhou
- Department of Environmental Health, College of Preventive Medicine, Army Medical University (Third Military Medical University), Chongqing 400038, China
| | - Ailing Ji
- Department of Preventive Medicine, Chongqing Medical and Pharmaceutical College, Chongqing 401331, China.
| | - Peng Luo
- School of Public Health, the key Laboratory of Environmental Pollution Monitoring and Disease Control, Ministry of Education, Guizhou Medical University, Guiyang 561113, China.
| | - Tongjian Cai
- School of Public Health, the key Laboratory of Environmental Pollution Monitoring and Disease Control, Ministry of Education, Guizhou Medical University, Guiyang 561113, China; Department of Epidemiology, College of Preventive Medicine, State Key Laboratory of Trauma and Chemical Poisoning, Army Medical University (Third Military Medical University), Chongqing 400038, China.
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Antidotal Potency of the Novel, Structurally Different Adsorbents in Rats Acutely Intoxicated with the T-2 Toxin. Toxins (Basel) 2020; 12:toxins12100643. [PMID: 33028026 PMCID: PMC7600379 DOI: 10.3390/toxins12100643] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2020] [Revised: 09/30/2020] [Accepted: 10/02/2020] [Indexed: 11/21/2022] Open
Abstract
In this paper, the potential antidote efficacy of commercially available formulations of various feed additives such as Minazel-Plus®, Mycosorb®, and Mycofix® was considered by recording their incidence on general health, body weight, and food and water intake, as well as through histopathology and semiquantitative analysis of gastric alterations in Wistar rats treated with the T-2 toxin in a single-dose regimen of 1.67 mg/kg p.o. (1 LD50) for 4 weeks. As an organic adsorbent, Mycosorb® successfully antagonized acute lethal incidence of the T-2 toxin (protective index (PI) = 2.25; p < 0.05 vs. T-2 toxin), and had adverse effects on body weight gain as well as food and water intake during the research (p < 0.001). However, the protective efficacy of the other two food additives was significantly lower (p < 0.05). Treatment with Mycosorb® significantly reduced the severity of gastric damage, which was not the case when the other two adsorbents were used. Our results suggest that Mycosorb® is a much better adsorbent for preventing the adverse impact of the T-2 toxin as well as its toxic metabolites compared with Minazel-plus® or Mycofix-plus®, and it almost completely suppresses its acute toxic effects and cytotoxic potential on the gastric epithelial, glandular, and vascular endothelial cells.
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Zhu L, Yi X, Ma C, Luo C, Kong L, Lin X, Gao X, Yuan Z, Wen L, Li R, Wu J, Yi J. Betulinic Acid Attenuates Oxidative Stress in the Thymus Induced by Acute Exposure to T-2 Toxin via Regulation of the MAPK/Nrf2 Signaling Pathway. Toxins (Basel) 2020; 12:toxins12090540. [PMID: 32842569 PMCID: PMC7551141 DOI: 10.3390/toxins12090540] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2020] [Revised: 08/18/2020] [Accepted: 08/19/2020] [Indexed: 12/17/2022] Open
Abstract
T-2 toxin, the most toxic of the trichothecenes, is widely found in grains and feeds, and its intake poses serious risks to the health of humans and animals. An important cytotoxicity mechanism of T-2 toxin is the production of excess free radicals, which in turn leads to oxidative stress. Betulinic acid (BA) has many biological activities, including antioxidant activity, which is a plant-derived pentacyclic triterpenoid. The protective effects and mechanisms of BA in blocking oxidative stress caused by acute exposure to T-2 toxin in the thymus of mice was studied. BA pretreatment reduced ROS production, decreased the MDA content, and increased the content of IgG in serum and the levels of SOD and GSH in the thymus. BA pretreatment also reduced the degree of congestion observed in histopathological tissue sections of the thymus induced by T-2 toxin. Besides, BA downregulated the phosphorylation of the p38, JNK, and ERK proteins, while it upregulated the expression of the Nrf2 and HO-1 proteins in thymus tissues. The results indicated that BA could protect the thymus against the oxidative damage challenged by T-2 toxin by activating Nrf2 and suppressing the MAPK signaling pathway.
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Affiliation(s)
- Lijuan Zhu
- Colleges of Veterinary Medicine, Hunan Agricultural University, Changsha 410128, China; (L.Z.); (X.Y.); (C.M.); (C.L.); (L.K.); (X.L.); (X.G.); (Z.Y.); (L.W.); (R.L.)
| | - Xianglian Yi
- Colleges of Veterinary Medicine, Hunan Agricultural University, Changsha 410128, China; (L.Z.); (X.Y.); (C.M.); (C.L.); (L.K.); (X.L.); (X.G.); (Z.Y.); (L.W.); (R.L.)
| | - Chaoyang Ma
- Colleges of Veterinary Medicine, Hunan Agricultural University, Changsha 410128, China; (L.Z.); (X.Y.); (C.M.); (C.L.); (L.K.); (X.L.); (X.G.); (Z.Y.); (L.W.); (R.L.)
| | - Chenxi Luo
- Colleges of Veterinary Medicine, Hunan Agricultural University, Changsha 410128, China; (L.Z.); (X.Y.); (C.M.); (C.L.); (L.K.); (X.L.); (X.G.); (Z.Y.); (L.W.); (R.L.)
| | - Li Kong
- Colleges of Veterinary Medicine, Hunan Agricultural University, Changsha 410128, China; (L.Z.); (X.Y.); (C.M.); (C.L.); (L.K.); (X.L.); (X.G.); (Z.Y.); (L.W.); (R.L.)
| | - Xing Lin
- Colleges of Veterinary Medicine, Hunan Agricultural University, Changsha 410128, China; (L.Z.); (X.Y.); (C.M.); (C.L.); (L.K.); (X.L.); (X.G.); (Z.Y.); (L.W.); (R.L.)
| | - Xinyu Gao
- Colleges of Veterinary Medicine, Hunan Agricultural University, Changsha 410128, China; (L.Z.); (X.Y.); (C.M.); (C.L.); (L.K.); (X.L.); (X.G.); (Z.Y.); (L.W.); (R.L.)
| | - Zhihang Yuan
- Colleges of Veterinary Medicine, Hunan Agricultural University, Changsha 410128, China; (L.Z.); (X.Y.); (C.M.); (C.L.); (L.K.); (X.L.); (X.G.); (Z.Y.); (L.W.); (R.L.)
- Hunan Engineering Research Center of Livestock and Poultry Health Care, Changsha 410128, China
| | - Lixin Wen
- Colleges of Veterinary Medicine, Hunan Agricultural University, Changsha 410128, China; (L.Z.); (X.Y.); (C.M.); (C.L.); (L.K.); (X.L.); (X.G.); (Z.Y.); (L.W.); (R.L.)
- Hunan Engineering Research Center of Livestock and Poultry Health Care, Changsha 410128, China
- Hunan Co-Innovation Center of Animal Production Safety, Changsha 410128, China
| | - Rongfang Li
- Colleges of Veterinary Medicine, Hunan Agricultural University, Changsha 410128, China; (L.Z.); (X.Y.); (C.M.); (C.L.); (L.K.); (X.L.); (X.G.); (Z.Y.); (L.W.); (R.L.)
- Hunan Engineering Research Center of Livestock and Poultry Health Care, Changsha 410128, China
- Hunan Co-Innovation Center of Animal Production Safety, Changsha 410128, China
| | - Jing Wu
- Colleges of Veterinary Medicine, Hunan Agricultural University, Changsha 410128, China; (L.Z.); (X.Y.); (C.M.); (C.L.); (L.K.); (X.L.); (X.G.); (Z.Y.); (L.W.); (R.L.)
- Hunan Engineering Research Center of Livestock and Poultry Health Care, Changsha 410128, China
- Correspondence: (J.W.); (J.Y.)
| | - Jine Yi
- Colleges of Veterinary Medicine, Hunan Agricultural University, Changsha 410128, China; (L.Z.); (X.Y.); (C.M.); (C.L.); (L.K.); (X.L.); (X.G.); (Z.Y.); (L.W.); (R.L.)
- Hunan Engineering Research Center of Livestock and Poultry Health Care, Changsha 410128, China
- Hunan Co-Innovation Center of Animal Production Safety, Changsha 410128, China
- Correspondence: (J.W.); (J.Y.)
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Jaćević V, Wu Q, Nepovimova E, Kuča K. Efficacy of methylprednisolone on T-2 toxin-induced cardiotoxicity in vivo: A pathohistological study. ENVIRONMENTAL TOXICOLOGY AND PHARMACOLOGY 2019; 71:103221. [PMID: 31365892 DOI: 10.1016/j.etap.2019.103221] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/11/2019] [Revised: 07/11/2019] [Accepted: 07/15/2019] [Indexed: 06/10/2023]
Abstract
Our aim was to compare the protective efficacy of two different formulations of methylprednisolone in T-2 toxin-induced cardiomyopathy. Methylprednisolone (soluble form, Lemod-solu® and/or depot form, Lemod-depo®, a total single dose of 40 mg/kg im) was given immediately after T-2 toxin (1 LD50 0.23 mg/kg sc). The myocardial tissue samples were examinated by using histopathology, semiquantitative and imaging analyses on day 1, 7, 14, 21, 28 and 60 of the study. Therapeutic application of Lemod-solu® significantly decreased the intensity of myocardial degeneration and haemorrhages, distribution of glycogen granules in the endo- and perimysium, a total number of mast cells and the degree of their degranulation was in correlation with the reversible heart structural lesions (p < 0.01 vs. T-2 toxin). These changes were completely abolished by the therapeutic use of Lemod-solu® plus Lemod-depo® (p < 0.001 vs. T-2 toxin). Our results show that a significant cardioprotective efficacy of methylprednisolone is mediated by its anti-inflammatory activity.
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Affiliation(s)
- Vesna Jaćević
- National Poison Control Centre, Military Medical Academy, 17 Crnotravska St, 11000, Belgrade, Serbia; Medical Faculty of the Military Medical Academy, University of Defence, 1 Pavla Jurišića-Šturma St, 11000, Belgrade, Serbia; Department of Chemistry, Faculty of Science, University of Hradec Kralove, Rokitanského 62, 500 03, Hradec Králové, Czechia
| | - Qinghua Wu
- College of Life Science, Yangtze University, 1 Nanhuan Road, 434023, Jingzhou, Hubei, China; Department of Chemistry, Faculty of Science, University of Hradec Kralove, Rokitanského 62, 500 03, Hradec Králové, Czechia
| | - Eugenie Nepovimova
- Department of Chemistry, Faculty of Science, University of Hradec Kralove, Rokitanského 62, 500 03, Hradec Králové, Czechia
| | - Kamil Kuča
- Department of Chemistry, Faculty of Science, University of Hradec Kralove, Rokitanského 62, 500 03, Hradec Králové, Czechia; Malaysia-Japan International Institute of Technology (MJIIT), University Teknologi Malaysia, Jalan Sultan Yahya Petra, 54100, Kuala Lumpur, Malaysia.
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Ngampongsa S, Hanafusa M, Ando K, Ito K, Kuwahara M, Yamamoto Y, Yamashita M, Tsuru Y, Tsubone H. Toxic effects of T-2 toxin and deoxynivalenol on the mitochondrial electron transport system of cardiomyocytes in rats. J Toxicol Sci 2013; 38:495-502. [PMID: 23719927 DOI: 10.2131/jts.38.495] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
The in vitro effects of 2 representative mycotoxins, T-2 toxin and deoxynivalenol (DON), of trichothecene group on the electron transport system (ETS) of mitochondria in rat cardiomyocytes were investigated by measuring oxygen consumption rates (OCR). The ATP-linked OCR and the reserve capacity (RC) of the mitochondria ETS were quantified by a "mitochondria stress test" which was estimated by the OCR responses to oligomycin and carbonyl cyanide-p-trifluoromethoxyphenylhydrazone, with an extracellular flux analyzer. The basal OCR was significantly inhibited by the application of T-2 toxin at concentrations of 6 × 10⁻¹ to 6 × 10⁻⁵ μM and DON at concentrations of 0.78 to 100 μM for 24 hr. The threshold of cardiomyocyte toxicity was estimated to be between 6.0 × 10⁻⁶ and 6.0 × 10⁻⁵ μM for T-2 toxicity on both ATP-linked OCR and RC and between 0.39 and 0.78 μM on ATP-linked OCR or between 1.56 and 3.13 μM on RC for DON. The decrease in OCR of cardiomyocytes exposed to T-2 toxin with a concentration of 6.0 × 10⁻³ and 6.0 × 10⁻⁴ μM was significantly inhibited by antioxidants, catalase and vitamin C. In conclusion, the present study demonstrated, through the direct and real-time measurement of respiratory function in mitochondria, that a marked inhibition of mitochondrial ETS function in cardiomyocytes was induced by T-2 toxin and DON and that the mitochondrial dysfunction by T-2 toxin was largely associated with oxidative stress.
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Affiliation(s)
- Suchitra Ngampongsa
- Department of Comparative Pathophysiology, Division of Veterinary Medical Sciences, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Japan
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Acute and Chronic Disease Associated with Naturally Occurring T-2 Mycotoxicosis in Sheep. J Comp Pathol 2013; 148:236-42. [DOI: 10.1016/j.jcpa.2012.05.016] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2012] [Revised: 05/09/2012] [Accepted: 05/30/2012] [Indexed: 11/23/2022]
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Histochemical evaluation of T-2 toxin-induced cardiotoxicity in rats: Semiquantitative analysis. ZBORNIK MATICE SRPSKE ZA PRIRODNE NAUKE 2009. [DOI: 10.2298/zmspn0916067j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
Abstract
In this study female Wistar rats were treated with T-2 toxin (1 LD50 0.23 mg/kg sc) and sacrificed on days 1, 3, 5, 7, 14, 21, 28 and 60 after the treatment. Control groups of rats were treated by saline (1 ml/kg 0.9% NaCl). At each time-schedule, control groups of animals were sacrificed, too. Pathohistological alterations of the heart were evaluated in whole visual fields stained by haematoxylin and eosin (HE), periodic acid- -Schiff's (PAS), Masson-Trichrom's (MT) and Giemsa (GIM) methods. The changes observed were scored by using semiquantitative grading scale. The heart alterations detected in T-2 toxin-treated animals ranged from focal parenchymal or hyaline degeneration (HE = 2.5 - 4.0; p < 0.05 vs. control) to diffuse necrosis of muscle cells (HE = 5.0; p < 0.05 vs. control and 1st day after T-2 treatment). The myofibrils were slightly PAS-positive during the first week of the study (PAS = 2.0 - 3.2; p < 0.05 vs. control and 1st day after T-2 treatment), while a diffuse distribution of glycogen granules in endo- and perimisium were observed from day 21 to 60 in the whole heart' tissue (PAS = 4.0; p < 0.05 vs. control and 1st day after T-2 treatment). Massive hemorrhagic foci associated with diffuse accumulation and degranulation of MCs were the most intensive from day 28 to 60 of the study (MT = 5.0; p < 0.05 vs. control and 1st day after T-2 treatment). During the whole study period, irregular distribution of glycogen granules, intensity and total number of haemorrhages were in correlation with the degree of heart structural lesions, which showed the highest coefficient of correlation (r = 0.8750; p < 0.001). Our results indicate that basic histohemical methods can be a useful tool for evaluation of T-2 toxin-induced cardiac damage, which is probably a result of complex inflammatory mechanisms, eventually leading to vascular lesions and myocardial necrosis, as well as for some potential cardioprotectors in the future.
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Morphometric changes of cardiac mast cells in rats acutely poisoned by T-2 toxin. ACTA VET-BEOGRAD 2007. [DOI: 10.2298/avb0701047j] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
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