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Zhao J, Yang Q, Liu Z, Xu P, Tian L, Yan J, Li K, Lin B, Bian L, Xi Z, Liu X. The impact of subchronic ozone exposure on serum metabolome and the mechanisms of abnormal bile acid and arachidonic acid metabolisms in the liver. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2023; 252:114573. [PMID: 36701875 DOI: 10.1016/j.ecoenv.2023.114573] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/04/2022] [Revised: 12/28/2022] [Accepted: 01/22/2023] [Indexed: 06/17/2023]
Abstract
Ambient ozone (O3) pollution can induce respiratory and cardiovascular toxicity. However, its impact on the metabolome and the underlying mechanisms remain unclear. This study first investigated the serum metabolite changes in rats exposed to 0.5 ppm O3 for 3 months using untargeted metabolomic approach. Results showed chronic ozone exposure significantly altered the serum levels of 34 metabolites with potential increased risk of digestive, respiratory and cardiovascular disease. Moreover, bile acid synthesis and secretion, and arachidonic acid (AA) metabolism became the most prominent affected metabolic pathways after O3 exposure. Further studies on the mechanisms found that the elevated serum toxic bile acid was not due to the increased biosynthesis in the liver, but the reduced reuptake from the portal vein to hepatocytes owing to repressed Ntcp and Oatp1a1, and the decreased bile acid efflux in hepatocytes as a results of inhibited Bsep, Ostalpha and Ostbeta. Meanwhile, decreased expressions of detoxification enzyme of SULT2A1 and the important regulators of FXR, PXR and HNF4α also contributed to the abnormal bile acids. In addition, O3 promoted the conversion of AA into thromboxane A2 (TXA2) and 20-hydroxyarachidonic acid (20-HETE) in the liver by up-regulation of Fads2, Cyp4a and Tbxas1 which resulting in decreased AA and linoleic acid (LA), and increased thromboxane B2 (TXB2) and 20-HETE in the serum. Furthermore, apparent hepatic chronic inflammation, fibrosis and abnormal function were found in ozone-exposed rats. These results indicated chronic ozone exposure could alter serum metabolites by interfering their metabolism in the liver, and inducing liver injury to aggravate metabolic disorders.
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Affiliation(s)
- Jiao Zhao
- Tianjin Institute of Environmental and Operational Medicine, Tianjin 300050, China; Tianjin Key Laboratory of Exercise Physiology and Sports Medicine, Tianjin Sport University, Tianjin 301617, China.
| | - Qingcheng Yang
- Tianjin Institute of Environmental and Operational Medicine, Tianjin 300050, China; Tianjin Key Laboratory of Exercise Physiology and Sports Medicine, Tianjin Sport University, Tianjin 301617, China.
| | - Zhiyuan Liu
- Tianjin Institute of Environmental and Operational Medicine, Tianjin 300050, China; Tianjin Key Laboratory of Exercise Physiology and Sports Medicine, Tianjin Sport University, Tianjin 301617, China.
| | - Pengfei Xu
- Tianjin Institute of Environmental and Operational Medicine, Tianjin 300050, China; Tianjin Key Laboratory of Exercise Physiology and Sports Medicine, Tianjin Sport University, Tianjin 301617, China.
| | - Lei Tian
- Tianjin Institute of Environmental and Operational Medicine, Tianjin 300050, China.
| | - Jun Yan
- Tianjin Institute of Environmental and Operational Medicine, Tianjin 300050, China.
| | - Kang Li
- Tianjin Institute of Environmental and Operational Medicine, Tianjin 300050, China.
| | - Bencheng Lin
- Tianjin Institute of Environmental and Operational Medicine, Tianjin 300050, China.
| | - Liping Bian
- Tianjin Institute of Environmental and Operational Medicine, Tianjin 300050, China.
| | - Zhuge Xi
- Tianjin Institute of Environmental and Operational Medicine, Tianjin 300050, China.
| | - Xiaohua Liu
- Tianjin Institute of Environmental and Operational Medicine, Tianjin 300050, China; Tianjin Key Laboratory of Exercise Physiology and Sports Medicine, Tianjin Sport University, Tianjin 301617, China.
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van Hoof HJ, den Hartog GJ, Voss HP, van Bree L, Bast A. Capsaicin treatment induces muscarinic hyperreactivity in guinea pig trachea: a warning. Eur J Pharmacol 1998; 347:261-4. [PMID: 9653892 DOI: 10.1016/s0014-2999(98)00218-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Capsaicin (8-methyl-N-vanillyl-6-nonenamide) is a widely used tool for the depletion of neuropeptides from sensory C-fibres. Upon capsaicin treatment tachykinins are released, resulting in a variety of responses in the airways. We showed that after capsaicin (0.3 microM; 30 min) treatment of guinea pig tracheal smooth muscle preparations, the maximal contraction of the trachea after methacholine stimulation was strongly increased (capsaicin: 1.147 +/- 0.050 g vs. control: 0.717 +/- 0.047 g). This effect was completely nullified after pretreatment with capsazepine (2-[2-(4-chlorophenyl)ethyl-amino-thiocarbonyl]-7,8-dihydroxy-2,3, 4,5-tetrahydro-1H-2benzazepine; a vanilloid receptor antagonist) and YM38336 (a dual tachykinin NK1 and tachykinin NK2 receptor antagonist). Our results serve as a warning against using capsaicin as a putatively clean pharmacological tool to deplete the neuropeptides from pools on the C-fibres because we showed that capsaicin also strongly influences basal mechanisms in tracheal smooth muscle control.
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Affiliation(s)
- H J van Hoof
- Leiden/Amsterdam Center for Drug Research, Department of Pharmacochemistry, Faculty of Chemistry, Vrije Universiteit, Amsterdam, Netherlands
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