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Mu Y, Chen H, Li J, Han P, Yan Z. Sulfate assimilation regulates antioxidant defense response of the cyanobacterium Synechococcus elongatus PCC 7942 to high concentrations of carbon dioxide. Appl Environ Microbiol 2025; 91:e0011525. [PMID: 40047425 PMCID: PMC12016511 DOI: 10.1128/aem.00115-25] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2025] [Accepted: 02/06/2025] [Indexed: 04/24/2025] Open
Abstract
The adaptive evolution of cyanobacteria over a prolonged period has allowed them to utilize carbon dioxide (CO2) at the low concentrations found in the atmosphere (0.04% CO2) for growth. However, whether the exposure of cyanobacteria to high concentrations of CO2 results in oxidative stress and the activation of antioxidant defense response remains unknown, albeit fluctuations in other culture conditions have been reported to exert these effects. The current study reveals the physiological regulation of the model cyanobacterium Synechococcus elongatus PCC 7942 upon exposure to 1% CO2 and the underlying mechanism. Exposure to 1% CO2 was demonstrated to induce oxidative stress and activate antioxidant defense responses in S. elongatus. Further analysis of variations in metabolism between S. elongatus cells grown at 0.04% CO2 and exposed to 1% CO2 revealed that sulfate assimilation was enhanced after the exposure to 1% CO2. A strain of S. elongatus lacking the gene cysR, encoding a global transcriptional regulator for genes involved in sulfate assimilation, was generated by deleting the gene from the genomic DNA. A comparative analysis of the wild-type and cysR-null strains indicated the regulation of the antioxidant response by sulfate assimilation. In addition, lines of evidence were presented that suggest a role of degradation of phycobilisome in the antioxidant response of S. elongatus under conditions of 1% CO2 and sulfate limitation. This study sheds light on the in situ effects of high CO2-induced stress on the ecophysiology of cyanobacteria upon exposure to diverse scenarios from a biotechnological and ecological perspective.IMPORTANCECyanobacteria that grow autotrophically with CO2 as the sole carbon source can be subject to high-CO2 stress in a variety of biotechnological and ecological scenarios. However, physiological regulation of cyanobacteria in response to high-CO2 stress remains elusive. Here, we employed microbial physiological, biochemical, and genetic techniques to reveal the regulatory strategies of cyanobacteria in response to high-CO2 stress. This study, albeit physiological, provides a biotechnological enterprise for manipulating cyanobacteria as the chassis for CO2 conversion and sheds light on the in situ ecological effects of high CO2 on cyanobacteria.
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Affiliation(s)
- Yujie Mu
- Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Qingdao, Shandong, China
| | - Huiting Chen
- Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Qingdao, Shandong, China
| | - Jianwei Li
- Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Qingdao, Shandong, China
| | - Pei Han
- Key Laboratory of Space Utilization, Technology and Engineering Center for Space Utilization, Chinese Academy of Sciences, Beijing, China
| | - Zhen Yan
- Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Qingdao, Shandong, China
- State Key Laboratory of Microbial Technology, Microbial Technology Institute, Shandong University State, Qingdao, Shandong, China
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Wu L, Xin Y, Zhang J, Cui F, Chen T, Chen L, Ma J, Niu P. Metabolic signatures of population exposure to metal mixtures: A metabolome-wide association study. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2024; 360:124673. [PMID: 39103040 DOI: 10.1016/j.envpol.2024.124673] [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: 03/11/2024] [Revised: 07/28/2024] [Accepted: 08/03/2024] [Indexed: 08/07/2024]
Abstract
Numerous studies have explored the health impacts of individual metal exposures, yet the effects of metal mixtures on human endogenous metabolism remain largely unexplored. We aimed to assess the serum metabolic signatures of people exposed to metal mixtures. Serum and urine samples were collected from 186 workers at a steel factory in Anhui, China, in September 2019. Inductively coupled plasma mass spectrometry was used to analyze the concentrations of 23 metal elements. The serum metabolome was determined by liquid chromatography-mass spectrometry (LC-MS). A metabolome-wide association study (MWAS) was performed across the metal exposures and metabolism using quantile g-computation modeling. Pathway enrichment analysis was performed using MetaboAnalyst. We identified 226 metabolites associated with metal mixtures, primarily involving lipid metabolism (glycerophospholipids, sphingolipids), amino acid metabolism (arginine and proline, alanine, aspartate and glutamate metabolism) and caffeine metabolic pathways. Exposure to metal mixtures is mainly associated with alterations in lipid metabolism and amino acid metabolism, particularly in the glycerophospholipid and arginine and proline metabolism pathways.
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Affiliation(s)
- Luli Wu
- Department of Occupational Health and Environmental Health, School of Public Health, Capital Medical University, 100069, Beijing, China; Beijing Key Laboratory of Environmental Toxicology, School of Public Health, Capital Medical University, 100069, Beijing, China
| | - Ye Xin
- Department of Occupational Health and Environmental Health, School of Public Health, Capital Medical University, 100069, Beijing, China; Beijing Key Laboratory of Environmental Toxicology, School of Public Health, Capital Medical University, 100069, Beijing, China
| | - Junrou Zhang
- Department of Occupational Health and Environmental Health, School of Public Health, Capital Medical University, 100069, Beijing, China; Beijing Key Laboratory of Environmental Toxicology, School of Public Health, Capital Medical University, 100069, Beijing, China
| | - Fengtao Cui
- Department of Occupational Health and Environmental Health, School of Public Health, Capital Medical University, 100069, Beijing, China; Beijing Key Laboratory of Environmental Toxicology, School of Public Health, Capital Medical University, 100069, Beijing, China; Occupational Disease Prevention and Control Hospital of Huaibei Mining Co., Ltd, 235000, Huaibei, Anhui Province, China
| | - Tian Chen
- Department of Occupational Health and Environmental Health, School of Public Health, Capital Medical University, 100069, Beijing, China; Beijing Key Laboratory of Environmental Toxicology, School of Public Health, Capital Medical University, 100069, Beijing, China
| | - Li Chen
- Department of Occupational Health and Environmental Health, School of Public Health, Capital Medical University, 100069, Beijing, China; Beijing Key Laboratory of Environmental Toxicology, School of Public Health, Capital Medical University, 100069, Beijing, China
| | - Junxiang Ma
- Department of Occupational Health and Environmental Health, School of Public Health, Capital Medical University, 100069, Beijing, China; Beijing Key Laboratory of Environmental Toxicology, School of Public Health, Capital Medical University, 100069, Beijing, China
| | - Piye Niu
- Department of Occupational Health and Environmental Health, School of Public Health, Capital Medical University, 100069, Beijing, China; Beijing Key Laboratory of Environmental Toxicology, School of Public Health, Capital Medical University, 100069, Beijing, China.
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Bu JW, Wang ZG, Liu HY, Liu SL. Metal nanozymes modulation of reactive oxygen species as promising strategies for cancer therapy. Int J Pharm 2024; 662:124453. [PMID: 39013531 DOI: 10.1016/j.ijpharm.2024.124453] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2024] [Revised: 06/11/2024] [Accepted: 07/07/2024] [Indexed: 07/18/2024]
Abstract
Nanozymes, nanostructured materials emulating natural enzyme activities, exhibit potential in catalyzing reactive oxygen species (ROS) production for cancer treatment. By facilitating oxidative reactions, elevating ROS levels, and influencing the tumor microenvironment (TME), nanozymes foster the eradication of cancer cells. Noteworthy are their superior stability, ease of preservation, and cost-effectiveness compared to natural enzymes, rendering them invaluable for medical applications. This comprehensive review intricately explores the interplay between ROS and tumor therapy, with a focused examination of metal-based nanozyme strategies mitigating tumor hypoxia. It provides nuanced insights into diverse catalytic processes, mechanisms, and surface modifications of various metal nanozymes, shedding light on their role in intra-tumoral ROS generation and applications in antioxidant therapy. The review concludes by delineating specific potential prospects and challenges associated with the burgeoning use of metal nanozymes in future tumor therapies.
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Affiliation(s)
- Jin-Wei Bu
- Engineering Research Center of Nano-Geomaterials of Ministry of Education, Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430074, P. R. China
| | - Zhi-Gang Wang
- College of Chemistry and School of Medicine, Nankai University, Tianjin 300071, P. R. China
| | - Hao-Yang Liu
- College of Chemistry and School of Medicine, Nankai University, Tianjin 300071, P. R. China.
| | - Shu-Lin Liu
- Engineering Research Center of Nano-Geomaterials of Ministry of Education, Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430074, P. R. China; College of Chemistry and School of Medicine, Nankai University, Tianjin 300071, P. R. China.
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Liu MY, Liu XY, Guo YY, Ma JY, Duan JL, Zhang M, Han Y, Sun XD, Sun YC, Wang Y, Yuan XZ, Feng LJ. Nitrogen Forms Regulate the Response of Microcystis aeruginosa to Nanoplastics at Environmentally Relevant Nitrogen Concentrations. ACS NANO 2024; 18:11828-11836. [PMID: 38659192 DOI: 10.1021/acsnano.4c00739] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/26/2024]
Abstract
As essential primary producers, cyanobacteria play a major role in global carbon and nitrogen cycles. Though the influence of nanoplastics on the carbon metabolism of cyanobacteria is well-studied, little is known about how nanoplastics affect their nitrogen metabolism, especially under environmentally relevant nitrogen concentrations. Here, we show that nitrogen forms regulated growth inhibition, nitrogen consumption, and the synthesis and release of microcystin (MC) in Microcystis aeruginosa exposed to 10 μg/mL amino-modified polystyrene nanoplastics (PS-NH2) with a particle size of 50 nm under environmentally relevant nitrogen concentrations of nitrate, ammonium, and urea. We demonstrate that PS-NH2 inhibit M. aeruginosa differently in nitrate, urea, and ammonium, with inhibition rates of 51.87, 39.70, and 36.69%, respectively. It is caused through the differences in impairing cell membrane integrity, disrupting redox homeostasis, and varying nitrogen transport pathways under different nitrogen forms. M. aeruginosa respond to exposure of PS-NH2 by utilizing additional nitrogen to boost the production of amino acids, thereby enhancing the synthesis of MC, extracellular polymeric substances, and membrane phospholipids. Our results found that the threat of nanoplastics on primary producers can be regulated by the nitrogen forms in freshwater ecosystems, contributing to a better understanding of nanoplastic risks under environmentally relevant conditions.
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Affiliation(s)
- Mei-Yan Liu
- Shandong Key Laboratory of Environmental Processes and Health, School of Environmental Science and Engineering, Shandong University, Qingdao, Shandong 266237, P. R. China
| | - Xiao-Yu Liu
- Shandong Key Laboratory of Environmental Processes and Health, School of Environmental Science and Engineering, Shandong University, Qingdao, Shandong 266237, P. R. China
| | - Yu-Yu Guo
- State Key Laboratory of Microbial Technology, Shandong University, Qingdao 266237, P. R. China
| | - Jing-Ya Ma
- Shandong Key Laboratory of Environmental Processes and Health, School of Environmental Science and Engineering, Shandong University, Qingdao, Shandong 266237, P. R. China
| | - Jian-Lu Duan
- Shandong Key Laboratory of Environmental Processes and Health, School of Environmental Science and Engineering, Shandong University, Qingdao, Shandong 266237, P. R. China
| | - Mou Zhang
- Shandong Key Laboratory of Environmental Processes and Health, School of Environmental Science and Engineering, Shandong University, Qingdao, Shandong 266237, P. R. China
| | - Yi Han
- Shandong Key Laboratory of Environmental Processes and Health, School of Environmental Science and Engineering, Shandong University, Qingdao, Shandong 266237, P. R. China
| | - Xiao-Dong Sun
- Shandong Key Laboratory of Environmental Processes and Health, School of Environmental Science and Engineering, Shandong University, Qingdao, Shandong 266237, P. R. China
| | - Yu-Chen Sun
- Shandong Key Laboratory of Environmental Processes and Health, School of Environmental Science and Engineering, Shandong University, Qingdao, Shandong 266237, P. R. China
| | - Yue Wang
- Shandong Key Laboratory of Environmental Processes and Health, School of Environmental Science and Engineering, Shandong University, Qingdao, Shandong 266237, P. R. China
| | - Xian-Zheng Yuan
- Shandong Key Laboratory of Environmental Processes and Health, School of Environmental Science and Engineering, Shandong University, Qingdao, Shandong 266237, P. R. China
- Sino-French Research Institute for Ecology and Environment (ISFREE), Shandong University, Qingdao, Shandong 266237, P. R. China
| | - Li-Juan Feng
- Shandong Key Laboratory of Environmental Processes and Health, School of Environmental Science and Engineering, Shandong University, Qingdao, Shandong 266237, P. R. China
- College of Geography and Environment, Shandong Normal University, Jinan, Shandong 250014, P. R. China
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Wang F, Wu Q, Jia G, Kong L, Zuo R, Feng K, Hou M, Chai Y, Xu J, Zhang C, Kang Q. Black Phosphorus/MnO 2 Nanocomposite Disrupting Bacterial Thermotolerance for Efficient Mild-Temperature Photothermal Therapy. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2023; 10:e2303911. [PMID: 37698584 PMCID: PMC10602513 DOI: 10.1002/advs.202303911] [Citation(s) in RCA: 19] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/14/2023] [Revised: 07/31/2023] [Indexed: 09/13/2023]
Abstract
The emergence of multi-drug resistant (MDR) pathogens is a major public health concern, posing a substantial global economic burden. Photothermal therapy (PTT) at mild temperature presents a promising alternative to traditional antibiotics due to its biological safety and ability to circumvent drug resistance. However, the efficacy of mild PTT is limited by bacterial thermotolerance. Herein, a nanocomposite, BP@Mn-NC, comprising black phosphorus nanosheets and a manganese-based nanozyme (Mn-NZ) is developed, which possesses both photothermal and catalytic properties. Mn-NZ imparts glucose oxidase- and peroxidase-like properties to BP@Mn-NC, generating reactive oxygen species (ROS) that induce lipid peroxidation and malondialdehyde accumulation across the bacterial cell membrane. This process disrupts unprotected respiratory chain complexes exposed on the bacterial cell membrane, leading to a reduction in the intracellular adenosine triphosphate (ATP) content. Consequently, mild PTT mediated by BP@Mn-NC effectively eliminates MDR infections by specifically impairing bacterial thermotolerance because of the dependence of bacterial heat shock proteins (HSPs) on ATP molecules for their proper functioning. This study paves the way for the development of a novel photothermal strategy to eradicate MDR pathogens, which targets bacterial HSPs through ROS-mediated inhibition of bacterial respiratory chain activity.
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Affiliation(s)
- Feng Wang
- Department of OrthopedicsShanghai Sixth People's Hospital Affiliated to Shanghai Jiao Tong University School of MedicineSchool of Biomedical EngineeringShanghai Jiao Tong UniversityShanghai200030China
| | - Qinghe Wu
- Department of OrthopedicsShanghai Sixth People's Hospital Affiliated to Shanghai Jiao Tong University School of MedicineSchool of Biomedical EngineeringShanghai Jiao Tong UniversityShanghai200030China
| | - Guoping Jia
- Department of OrthopedicsShanghai Sixth People's Hospital Affiliated to Shanghai Jiao Tong University School of MedicineSchool of Biomedical EngineeringShanghai Jiao Tong UniversityShanghai200030China
| | - Lingchi Kong
- Department of OrthopedicsShanghai Sixth People's Hospital Affiliated to Shanghai Jiao Tong University School of MedicineSchool of Biomedical EngineeringShanghai Jiao Tong UniversityShanghai200030China
| | - Rongtai Zuo
- Department of OrthopedicsShanghai Sixth People's Hospital Affiliated to Shanghai Jiao Tong University School of MedicineSchool of Biomedical EngineeringShanghai Jiao Tong UniversityShanghai200030China
| | - Kai Feng
- Department of OrthopedicsShanghai Sixth People's Hospital Affiliated to Shanghai Jiao Tong University School of MedicineSchool of Biomedical EngineeringShanghai Jiao Tong UniversityShanghai200030China
| | - Mengfei Hou
- Department of OrthopedicsShanghai Sixth People's Hospital Affiliated to Shanghai Jiao Tong University School of MedicineSchool of Biomedical EngineeringShanghai Jiao Tong UniversityShanghai200030China
| | - Yimin Chai
- Department of OrthopedicsShanghai Sixth People's Hospital Affiliated to Shanghai Jiao Tong University School of MedicineSchool of Biomedical EngineeringShanghai Jiao Tong UniversityShanghai200030China
| | - Jia Xu
- Department of OrthopedicsShanghai Sixth People's Hospital Affiliated to Shanghai Jiao Tong University School of MedicineSchool of Biomedical EngineeringShanghai Jiao Tong UniversityShanghai200030China
| | - Chunfu Zhang
- Department of OrthopedicsShanghai Sixth People's Hospital Affiliated to Shanghai Jiao Tong University School of MedicineSchool of Biomedical EngineeringShanghai Jiao Tong UniversityShanghai200030China
| | - Qinglin Kang
- Department of OrthopedicsShanghai Sixth People's Hospital Affiliated to Shanghai Jiao Tong University School of MedicineSchool of Biomedical EngineeringShanghai Jiao Tong UniversityShanghai200030China
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Ma P, Zang J, Shao T, Jiang Q, Li Y, Zhang W, Liu M. Cadmium distribution and transformation in leaf cells involved in detoxification and tolerance in barley. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2023; 249:114391. [PMID: 36508843 DOI: 10.1016/j.ecoenv.2022.114391] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/01/2022] [Revised: 11/14/2022] [Accepted: 12/03/2022] [Indexed: 06/17/2023]
Abstract
Barley is a diagnostic plant that often used in the research of soil pollution by heavy metals, our research explored the detoxification and tolerance mechanism of cadmium(Cd) in barley through pot experiment. We investigated subcellular distribution, chemical forms and oxidative damage of Cd in barley leaves, combing with the transmission electron microscopy and Fourier-transform infrared spectroscopy(FT-IR) to further understand the translocation, transformation characteristics and toxic effect of Cd in cells. The results showed that, the bioaccumulation factors in roots and shoots of barley were ranged of 4.03-7.48 and 0.51-1.30, respectively. Barley reduces the toxic effects by storing Cd in the roots and reducing its transport to the shoots. Compared to the control treatment (0 mg/kg), the percentage of Cd in the cell wall fractions of leaves in 300 mg/kg Cd treatment increased from 34.74 % to 38.41 %; the percentage of the organelle fractions increased from 24.47 % to 56.02 %; and the percentage of soluble fraction decreased from 40.80 % to 5.57 %. We found that 69.13 % of the highly toxic inorganic Cd and water-soluble Cd were converted to less toxic pectates and protein-integrated Cd (50.20 %) and undissolved Cd phosphates (18.93 %). This conversion of Cd was mainly due to its combination with -OH, -NH, -CN, -C-O-C, and -C-O-P groups. Excessive Cd induced a significant (P < 0.05) increase in the levels of peroxidase, malondialdehyde, and cell membrane permeability, which damaged the cell membrane and allowed Cd to enter the organelles. The chloroplasts and mitochondria were destroyed, and eventually the metabolism of intracellular substances was affected, resulting in symptoms of toxicity. Our research provides cellular-scale insight into the mechanisms of Cd tolerance in barley.
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Affiliation(s)
- Pan Ma
- College of Land and Environment, Shenyang Agricultural University, Shenyang 110866, Liaoning, China
| | - Jian Zang
- College of Land and Environment, Shenyang Agricultural University, Shenyang 110866, Liaoning, China
| | - Tingyu Shao
- College of Land and Environment, Shenyang Agricultural University, Shenyang 110866, Liaoning, China
| | - Qianru Jiang
- College of Land and Environment, Shenyang Agricultural University, Shenyang 110866, Liaoning, China
| | - Yuanqi Li
- College of Land and Environment, Shenyang Agricultural University, Shenyang 110866, Liaoning, China
| | - Wei Zhang
- College of Land and Environment, Shenyang Agricultural University, Shenyang 110866, Liaoning, China.
| | - Mingda Liu
- College of Land and Environment, Shenyang Agricultural University, Shenyang 110866, Liaoning, China.
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