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Brossier C, Jardou M, Janaszkiewicz A, Firoud D, Petit I, Arnion H, Pinault E, Sauvage FL, Druilhe A, Picard N, Di Meo F, Marquet P, Lawson R. Gut microbiota biotransformation of drug glucuronides leading to gastrointestinal toxicity: Therapeutic potential of bacterial β-glucuronidase inhibition in mycophenolate-induced enteropathy. Life Sci 2024; 351:122792. [PMID: 38857657 DOI: 10.1016/j.lfs.2024.122792] [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: 02/09/2024] [Revised: 04/28/2024] [Accepted: 06/04/2024] [Indexed: 06/12/2024]
Abstract
AIMS Drug-induced enteropathy is often associated with the therapeutic use of certain glucuronidated drugs. One such drug is mycophenolic acid (MPA), a well-established immunosuppressant of which gastrointestinal adverse effects are a major concern. The role of bacterial β-glucuronidase (β-G) from the gut microbiota in MPA-induced enteropathy has recently been discovered. Bacterial β-G hydrolyzes MPAG, the glucuronide metabolite of MPA excreted in the bile, leading to the digestive accumulation of MPA that would favor in turn these adverse events. We therefore hypothesized that taming bacterial β-G activity might reduce MPA digestive exposure and prevent its toxicity. MAIN METHODS By using a multiscale approach, we evaluated the effect of increasing concentrations of MPA on intestinal epithelial cells (Caco-2 cell line) viability, proliferation, and migration. Then, we investigated the inhibitory properties of amoxapine, a previously described bacterial β-G inhibitor, by using molecular dynamics simulations, and evaluated its efficiency in blocking MPAG hydrolysis in an Escherichia coli-based β-G activity assay. The pharmacological effect of amoxapine was evaluated in a mouse model. KEY FINDINGS We observed that MPA impairs intestinal epithelial cell homeostasis. Amoxapine efficiently blocks the hydrolysis of MPAG to MPA and significantly reduces digestive exposure to MPA in mice. As a result, administration of amoxapine in MPA-treated mice significantly attenuated gastrointestinal lesions. SIGNIFICANCE Collectively, these results suggest that the digestive accumulation of MPA is involved in the pathophysiology of MPA-gastrointestinal adverse effects. This study provides a proof-of-concept of the therapeutic potential of bacterial β-G inhibitors in glucuronidated drug-induced enteropathy.
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Affiliation(s)
- Clarisse Brossier
- Pharmacology & Transplantation (P&T), INSERM U1248, Université de Limoges, F-87000 Limoges, France
| | - Manon Jardou
- Pharmacology & Transplantation (P&T), INSERM U1248, Université de Limoges, F-87000 Limoges, France
| | - Angelika Janaszkiewicz
- Pharmacology & Transplantation (P&T), INSERM U1248, Université de Limoges, F-87000 Limoges, France
| | - Djouher Firoud
- Pharmacology & Transplantation (P&T), INSERM U1248, Université de Limoges, F-87000 Limoges, France
| | - Isy Petit
- Pharmacology & Transplantation (P&T), INSERM U1248, Université de Limoges, F-87000 Limoges, France
| | - Hélène Arnion
- Pharmacology & Transplantation (P&T), INSERM U1248, Université de Limoges, F-87000 Limoges, France
| | - Emilie Pinault
- Pharmacology & Transplantation (P&T), INSERM U1248, Université de Limoges, F-87000 Limoges, France
| | - François-Ludovic Sauvage
- Pharmacology & Transplantation (P&T), INSERM U1248, Université de Limoges, F-87000 Limoges, France
| | - Anne Druilhe
- Pharmacology & Transplantation (P&T), INSERM U1248, Université de Limoges, F-87000 Limoges, France
| | - Nicolas Picard
- Pharmacology & Transplantation (P&T), INSERM U1248, Université de Limoges, F-87000 Limoges, France; Department of Pharmacology, Toxicology and Pharmacovigilance, CHU Limoges, F-87000 Limoges, France
| | - Florent Di Meo
- Pharmacology & Transplantation (P&T), INSERM U1248, Université de Limoges, F-87000 Limoges, France
| | - Pierre Marquet
- Pharmacology & Transplantation (P&T), INSERM U1248, Université de Limoges, F-87000 Limoges, France; Department of Pharmacology, Toxicology and Pharmacovigilance, CHU Limoges, F-87000 Limoges, France
| | - Roland Lawson
- Pharmacology & Transplantation (P&T), INSERM U1248, Université de Limoges, F-87000 Limoges, France.
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You W, An Q, Guo D, Huang Z, Guo L, Chen Z, Xu H, Wang G, Weng Y, Ma Z, Chen X, Hong F, Zhao R. Exploration of risk analysis and elimination methods for a Cr(VI)-removal recombinant strain through a biosafety assessment in mice. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 912:168743. [PMID: 38007124 DOI: 10.1016/j.scitotenv.2023.168743] [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: 06/12/2023] [Revised: 10/26/2023] [Accepted: 11/19/2023] [Indexed: 11/27/2023]
Abstract
Though recombinant strains are increasingly recognized for their potential in heavy metal remediation, few studies have evaluated their safety. Moreover, biosafety assessments of fecal-oral pathway exposure at country as well as global level have seldom analyzed the health risks of exposure to microorganisms from a microscopic perspective. The present study aimed to predict the long-term toxic effects of recombinant strains by conducting a subacute toxicity test on the chromium-removal recombinant strain 3458 and analyzing the gut microbiome. The available disinfection methods were also evaluated. The results showed that strain 3458 induced liver damage and affected renal function and lipid metabolism at 1.0 × 1011 CFU/mL, which may be induced by its carrier strain, pET-28a. Strain 3458 poses the risk of increasing the number of pathogenic bacteria under prolonged exposure. When 500 mg L-1 chlorine-containing disinfectant or 250 mg L-1 chlorine dioxide disinfectant was added for 30 min, the sterilization rate exceeded 99.9 %. These findings suggest that existing wastewater disinfection methods can effectively sterilize strain 3458, ensuring its application value. The present study can serve a reference for the biosafety evaluation of the recombinant strain through exposure to the digestive tract and its feasibility for application in environmental pollution remediation.
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Affiliation(s)
- Wanting You
- State Key Laboratory of Vaccines for Infectious Diseases, Xiang An Biomedicine Laboratory, State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics, National Innovation Platform for Industry-Education Integration in Vaccine Research, School of Public Health, Xiamen University, No. 4221-117 South Xiang'an Road, Xiang'an District, Xiamen 361102, Fujian, People's Republic of China
| | - Qiuying An
- State Key Laboratory of Vaccines for Infectious Diseases, Xiang An Biomedicine Laboratory, State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics, National Innovation Platform for Industry-Education Integration in Vaccine Research, School of Public Health, Xiamen University, No. 4221-117 South Xiang'an Road, Xiang'an District, Xiamen 361102, Fujian, People's Republic of China
| | - Dongbei Guo
- State Key Laboratory of Vaccines for Infectious Diseases, Xiang An Biomedicine Laboratory, State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics, National Innovation Platform for Industry-Education Integration in Vaccine Research, School of Public Health, Xiamen University, No. 4221-117 South Xiang'an Road, Xiang'an District, Xiamen 361102, Fujian, People's Republic of China
| | - Zebo Huang
- State Key Laboratory of Vaccines for Infectious Diseases, Xiang An Biomedicine Laboratory, State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics, National Innovation Platform for Industry-Education Integration in Vaccine Research, School of Public Health, Xiamen University, No. 4221-117 South Xiang'an Road, Xiang'an District, Xiamen 361102, Fujian, People's Republic of China
| | - Lulu Guo
- State Key Laboratory of Vaccines for Infectious Diseases, Xiang An Biomedicine Laboratory, State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics, National Innovation Platform for Industry-Education Integration in Vaccine Research, School of Public Health, Xiamen University, No. 4221-117 South Xiang'an Road, Xiang'an District, Xiamen 361102, Fujian, People's Republic of China
| | - Zigui Chen
- State Key Laboratory of Vaccines for Infectious Diseases, Xiang An Biomedicine Laboratory, State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics, National Innovation Platform for Industry-Education Integration in Vaccine Research, School of Public Health, Xiamen University, No. 4221-117 South Xiang'an Road, Xiang'an District, Xiamen 361102, Fujian, People's Republic of China
| | - Hao Xu
- State Key Laboratory of Vaccines for Infectious Diseases, Xiang An Biomedicine Laboratory, State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics, National Innovation Platform for Industry-Education Integration in Vaccine Research, School of Public Health, Xiamen University, No. 4221-117 South Xiang'an Road, Xiang'an District, Xiamen 361102, Fujian, People's Republic of China
| | - Guangshun Wang
- State Key Laboratory of Vaccines for Infectious Diseases, Xiang An Biomedicine Laboratory, State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics, National Innovation Platform for Industry-Education Integration in Vaccine Research, School of Public Health, Xiamen University, No. 4221-117 South Xiang'an Road, Xiang'an District, Xiamen 361102, Fujian, People's Republic of China
| | - Yeting Weng
- State Key Laboratory of Vaccines for Infectious Diseases, Xiang An Biomedicine Laboratory, State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics, National Innovation Platform for Industry-Education Integration in Vaccine Research, School of Public Health, Xiamen University, No. 4221-117 South Xiang'an Road, Xiang'an District, Xiamen 361102, Fujian, People's Republic of China
| | - Zhangye Ma
- State Key Laboratory of Vaccines for Infectious Diseases, Xiang An Biomedicine Laboratory, State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics, National Innovation Platform for Industry-Education Integration in Vaccine Research, School of Public Health, Xiamen University, No. 4221-117 South Xiang'an Road, Xiang'an District, Xiamen 361102, Fujian, People's Republic of China
| | - Xiaoxuan Chen
- State Key Laboratory of Vaccines for Infectious Diseases, Xiang An Biomedicine Laboratory, State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics, National Innovation Platform for Industry-Education Integration in Vaccine Research, School of Public Health, Xiamen University, No. 4221-117 South Xiang'an Road, Xiang'an District, Xiamen 361102, Fujian, People's Republic of China
| | - Feng Hong
- Key Laboratory of Environmental Pollution Monitoring and Disease Control, Ministry of Education, Guizhou Medical University, Guiyang 550025, Guizhou, People's Republic of China
| | - Ran Zhao
- State Key Laboratory of Vaccines for Infectious Diseases, Xiang An Biomedicine Laboratory, State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics, National Innovation Platform for Industry-Education Integration in Vaccine Research, School of Public Health, Xiamen University, No. 4221-117 South Xiang'an Road, Xiang'an District, Xiamen 361102, Fujian, People's Republic of China.
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Han D, Zhang X, Ma Y, Yang X, Li Z. The development of live microorganism-based oxygen shuttles for enhanced hypoxic tumor therapy. Mater Today Bio 2022; 18:100517. [PMID: 36578285 PMCID: PMC9791452 DOI: 10.1016/j.mtbio.2022.100517] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2022] [Revised: 12/08/2022] [Accepted: 12/09/2022] [Indexed: 12/14/2022]
Abstract
Hypoxia is a prominent feature of malignant tumors and contributes to tumor proliferation, metastasis, and drug resistance in various solid tumors. Therefore, improving tumor oxygenation is crucial for curing tumors. To date, multiple strategies, including oxygen delivering and producing materials, have been designed to increase the oxygen concentration in hypoxic tumors. However, the unsustainable supply of oxygen is still the main obstacle, resulting in a suboptimal outcome in treating oxygen-deprived tumors. Thus, a sufficient oxygen supply is highly desirable in the treatment of hypoxic tumors. Photosynthesis, as the main source of oxygen in nature through the conversion of light energy into chemical energy and oxygen, has been widely studied in scientific research. Moreover, photosynthetic microorganisms have been increasingly applied in cancer therapy by increasing oxygenation, which improves the therapeutic effect of oxygen-consuming tumor therapeutic tools such as radiotherapy and photodynamic therapy. In this review, we summarize recent advances in the design and manufacture of live bacteria as oxygen shuttles for a new generation of hypoxic tumor treatment strategies. Finally, current challenges and future directions are also discussed for successfully addressing hypoxic tumor issues.
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Affiliation(s)
- Dandan Han
- Affiliated Dongguan Hospital, Southern Medical University, Dongguan, 523059, China,College of Chemistry & Environmental Science, Key Laboratory of Medicinal Chemistry and Molecular Diagnosis of Ministry of Education, Chemical Biology Key Laboratory of Hebei Province, Hebei University, Baoding, 071002, China
| | - Xing Zhang
- College of Chemistry & Environmental Science, Key Laboratory of Medicinal Chemistry and Molecular Diagnosis of Ministry of Education, Chemical Biology Key Laboratory of Hebei Province, Hebei University, Baoding, 071002, China
| | - Yichuan Ma
- College of Chemistry & Environmental Science, Key Laboratory of Medicinal Chemistry and Molecular Diagnosis of Ministry of Education, Chemical Biology Key Laboratory of Hebei Province, Hebei University, Baoding, 071002, China
| | - Xinjian Yang
- College of Chemistry & Environmental Science, Key Laboratory of Medicinal Chemistry and Molecular Diagnosis of Ministry of Education, Chemical Biology Key Laboratory of Hebei Province, Hebei University, Baoding, 071002, China,Corresponding author.
| | - Zhenhua Li
- Affiliated Dongguan Hospital, Southern Medical University, Dongguan, 523059, China,Guangdong Provincial Key Laboratory of Shock and Microcirculation, Guangdong, 510515, PR China,Corresponding author. Affiliated Dongguan Hospital, Southern Medical University, Dongguan, 523059, China.
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Zhang Z, Qin J, Wang Z, Chen F, Liao X, Hu X, Dong L. Sodium copper chlorophyll mediated photodynamic treatment inactivates Escherichia coli via oxidative damage. Food Res Int 2022; 157:111472. [PMID: 35761703 DOI: 10.1016/j.foodres.2022.111472] [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: 04/05/2022] [Revised: 05/22/2022] [Accepted: 06/04/2022] [Indexed: 11/17/2022]
Abstract
Photodynamic technology (PDT) is an emerging non-thermal processing technique, however, due to a lack of edible photosensitizers, its application to the food industry is limited. To better understand sodium copper chlorophyll (SCC) feasibility as a photosensitizer, we analyzed the effects of PDT-SCC on Escherichia coli O157:H7 inactivation using different lighting times (15, 30, 45, 60, and 75 min), lighting power (30, 60, 90, 120, and 150 W), and SCC concentrations (2, 4, 6, 8, and 10 mM). We showed that bactericidal effects depended on all three parameters, but the most suitable sterilization condition for E. coli occurred at 10 mM SCC, for 60 min at 120 W. We also investigated cell morphology, reactive oxygen species (ROS) production, the activity of three oxidative response enzymes (superoxide dismutase (SOD), catalase (CAT), and glutathione peroxidase (GPX)), and ompA, ompF, uvrA, and recA expression. When compared with the control group, PDT-SCC destroyed bacterial morphology, increased ROS production, decreased antioxidant enzyme activity (SOD, CAT, and GPX), down-regulated membrane protein gene expression, including ompA and ompF, and up-regulated the DNA damage-repair related genes, uvrA and recA. Thus, bacterial rupture caused by oxidative damage could be the main mechanism underpinning PDT-SCC action.
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Affiliation(s)
- Zequn Zhang
- College of Food Science and Nutritional Engineering, National Engineering Research Center for Fruit and Vegetable Processing, Key Laboratory of Fruits and Vegetables Processing, Ministry of Agriculture, Engineering Research Centre for Fruits and Vegetables Processing, Ministry of Education, China Agricultural University, Beijing 100083, China
| | - Jianran Qin
- College of Food Science and Nutritional Engineering, National Engineering Research Center for Fruit and Vegetable Processing, Key Laboratory of Fruits and Vegetables Processing, Ministry of Agriculture, Engineering Research Centre for Fruits and Vegetables Processing, Ministry of Education, China Agricultural University, Beijing 100083, China
| | - Zhe Wang
- College of Food Science and Nutritional Engineering, National Engineering Research Center for Fruit and Vegetable Processing, Key Laboratory of Fruits and Vegetables Processing, Ministry of Agriculture, Engineering Research Centre for Fruits and Vegetables Processing, Ministry of Education, China Agricultural University, Beijing 100083, China
| | - Fang Chen
- College of Food Science and Nutritional Engineering, National Engineering Research Center for Fruit and Vegetable Processing, Key Laboratory of Fruits and Vegetables Processing, Ministry of Agriculture, Engineering Research Centre for Fruits and Vegetables Processing, Ministry of Education, China Agricultural University, Beijing 100083, China
| | - Xiaojun Liao
- College of Food Science and Nutritional Engineering, National Engineering Research Center for Fruit and Vegetable Processing, Key Laboratory of Fruits and Vegetables Processing, Ministry of Agriculture, Engineering Research Centre for Fruits and Vegetables Processing, Ministry of Education, China Agricultural University, Beijing 100083, China
| | - Xiaosong Hu
- College of Food Science and Nutritional Engineering, National Engineering Research Center for Fruit and Vegetable Processing, Key Laboratory of Fruits and Vegetables Processing, Ministry of Agriculture, Engineering Research Centre for Fruits and Vegetables Processing, Ministry of Education, China Agricultural University, Beijing 100083, China
| | - Li Dong
- College of Food Science and Nutritional Engineering, National Engineering Research Center for Fruit and Vegetable Processing, Key Laboratory of Fruits and Vegetables Processing, Ministry of Agriculture, Engineering Research Centre for Fruits and Vegetables Processing, Ministry of Education, China Agricultural University, Beijing 100083, China.
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5
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Youseif SH, Abd El-Megeed FH, Abdelaal AS, Ageez A, Martínez-Romero E. Plant-microbe-microbe interactions influence the faba bean nodule colonization by diverse endophytic bacteria. FEMS Microbiol Ecol 2021; 97:6381688. [PMID: 34610117 DOI: 10.1093/femsec/fiab138] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2021] [Accepted: 09/30/2021] [Indexed: 11/14/2022] Open
Abstract
Legume root nodules harbor rhizobia and other non-nodulating endophytes known as nodule-associated bacteria (NAB) whose role in the legume symbiosis is still unknown. We analysed the genetic diversity of 34 NAB isolates obtained from the root nodules of faba bean grown under various soil conditions in Egypt using 16S rRNA and concatenated sequences of three housekeeping genes. All isolates were identified as members of the family Enterobacteriaceae belonging to the genera Klebsiella, Enterobacter and Raoultella. We identified nine enterobacterial genospecies, most of which have not been previously reported as NAB. All isolated strains harbored nifH gene sequences and most of them possessed plant growth-promoting (PGP) traits. Upon co-inoculation with an N2 fixing rhizobium (Rlv NGB-FR128), two strains (Enterobacter sichanensis NGB-FR97 and Klebsiella variicola NGB-FR116) significantly increased nodulation, growth and N-uptake of faba bean plants over the single treatments or the uninoculated control. The presence of these enterobacteria in nodules was significantly affected by the host plant genotype, symbiotic rhizobium genotype and endophyte genotype, indicating that the nodule colonization process is regulated by plant-microbe-microbe interactions. This study emphasizes the importance of nodule-associated enterobacteria and suggests their potential role in improving the effectiveness of rhizobial inoculants.
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Affiliation(s)
- Sameh H Youseif
- Department of Microbial Genetic Resources, National Gene Bank, Agricultural Research Center (ARC), Giza 12619, Egypt
| | - Fayrouz H Abd El-Megeed
- Department of Microbial Genetic Resources, National Gene Bank, Agricultural Research Center (ARC), Giza 12619, Egypt
| | - Ali S Abdelaal
- Department of Genetics, Faculty of Agriculture, Damietta University, Damietta 34517, Egypt
| | - Amr Ageez
- Agricultural Genetic Engineering Research Institute, Agricultural Research Center (ARC), Giza 12619, Egypt.,Faculty of Biotechnology, MSA University, 6th of October City 12451, Egypt
| | - Esperanza Martínez-Romero
- Programa de Ecología Genómica, Centro de Ciencias Genómicas, Universidad Nacional Autónoma de México, Cuernavaca, Morelos 62210, Mexico
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Abstract
Surface water contamination by pathogen bacteria remains a threat to public health in the rural areas of developing countries. Fecal indicator bacteria (FIB) like Escherichia coli (E. coli) are widely used to assess water contamination, but their behavior in tropical ecosystems is poorly documented. Our study focused on headwater wetlands which are likely to play a key role in stream water purification of fecal pollutants. Our main objectives were to: (i) evaluate decay rates (k) of the total, particle-attached and free-living E. coli; (ii) quantify the relative importance of solar radiation exposition and suspended particles deposition on k; and (iii) investigate E. coli survival in the deposited sediment. We installed and monitored 12 mesocosms, 4500 mL each, across the main headwater wetland of the Houay Pano catchment, northern Lao People’s Democratic Republic (Lao PDR), for 8 days. The four treatments with triplicates were: sediment deposition-light (DL); sediment deposition-dark (DD); sediment resuspension-light (RL); and sediment resuspension-dark (RD). Particle-attached bacteria predominated in all mesocosms (97 ± 6%). Decay rates ranged from 1.43 ± 0.15 to 1.17 ± 0.13 day−1 for DL and DD treatments, and from 0.50 ± 0.15 to −0.14 ± 0.37 day−1 for RL and RD treatments. Deposition processes accounted for an average of 92% of E. coli stock reduction, while solar radiation accounted for around 2% over the experiment duration. The sampling of E. coli by temporary resuspension of the deposited sediment showed k values close to zero, suggesting potential survival or even growth of bacteria in the sediment. The present findings may help parameterizing hydrological and water quality models in a tropical context.
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Deng X, Yang W, Shao Z, Zhao Y. Genetically modified bacteria for targeted phototherapy of tumor. Biomaterials 2021; 272:120809. [PMID: 33839624 DOI: 10.1016/j.biomaterials.2021.120809] [Citation(s) in RCA: 28] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2020] [Revised: 03/17/2021] [Accepted: 04/02/2021] [Indexed: 12/30/2022]
Abstract
Live attenuated bacteria have been used as target vehicles for genetic therapy of malignant carcinoma because they can be reprogrammed by following simple genetic rules and have the ability to target tumor hypoxic region. In this research, noninvasive Escherichia coli (E. Coli) is genetically modified through the plasmid transfection to afford E. Coli(p) with overexpressed human catalase for catalyzing H2O2 into O2 in the tumor site. The produced O2 is consequently converted to cytotoxic 1O2 under near-infrared (NIR) light irradiation for photodynamic therapy. Chlorin e6 (Ce6) is chosen as the photosensitizer for its excellent photodynamic ability, and polydopamine (pDA) is employed to encapsulate Ce6 for its good biosafety, photothermal ability, and adhesion capacity with bacteria. Dopamine polymerizes in the presence of Ce6 to form pDA/Ce6, and then E. Coli(p) is coated with pDA/Ce6 to afford the final E. Coli(p)/pDA/Ce6. The obtained system is intravenously administrated for selective accumulation and replication in the hypoxic tumor. NIR light irradiation is introduced to enable photothermal and O2-enhanced photodynamic therapy. On account of complementary combination, the system exhibits efficient antitumor effect in vitro and in vivo. Thus, the integration of genetically modified bacteria with pDA/Ce6 presents a promising application potential for precise tumor inhibition.
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Affiliation(s)
- Xiangyu Deng
- Department of Orthopaedic Surgery, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430022, China; Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore, 637371, Singapore
| | - Wenbo Yang
- Department of Orthopaedic Surgery, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430022, China
| | - Zengwu Shao
- Department of Orthopaedic Surgery, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430022, China.
| | - Yanli Zhao
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore, 637371, Singapore.
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Pang H, Mokhtari A, Chen Y, Oryang D, Ingram DT, Sharma M, Millner PD, Van Doren JM. A Predictive Model for Survival of Escherichia coli O157:H7 and Generic E. coli in Soil Amended with Untreated Animal Manure. RISK ANALYSIS : AN OFFICIAL PUBLICATION OF THE SOCIETY FOR RISK ANALYSIS 2020; 40:1367-1382. [PMID: 32378782 DOI: 10.1111/risa.13491] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/29/2019] [Revised: 03/19/2020] [Accepted: 03/27/2020] [Indexed: 06/11/2023]
Abstract
This study aimed at developing a predictive model that captures the influences of a variety of agricultural and environmental variables and is able to predict the concentrations of enteric bacteria in soil amended with untreated Biological Soil Amendments of Animal Origin (BSAAO) under dynamic conditions. We developed and validated a Random Forest model using data from a longitudinal field study conducted in mid-Atlantic United States investigating the survival of Escherichia coli O157:H7 and generic E. coli in soils amended with untreated dairy manure, horse manure, or poultry litter. Amendment type, days of rain since the previous sampling day, and soil moisture content were identified as the most influential agricultural and environmental variables impacting concentrations of viable E. coli O157:H7 and generic E. coli recovered from amended soils. Our model results also indicated that E. coli O157:H7 and generic E. coli declined at similar rates in amended soils under dynamic field conditions.The Random Forest model accurately predicted changes in viable E. coli concentrations over time under different agricultural and environmental conditions. Our model also accurately characterized the variability of E. coli concentration in amended soil over time by providing upper and lower prediction bound estimates. Cross-validation results indicated that our model can be potentially generalized to other geographic regions and incorporated into a risk assessment for evaluating the risks associated with application of untreated BSAAO. Our model can be validated for other regions and predictive performance also can be enhanced when data sets from additional geographic regions become available.
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Affiliation(s)
- Hao Pang
- Center for Food Safety and Applied Nutrition, Food and Drug Administration, Office of Analytics and Outreach, College Park, MD, USA
- Joint Institute for Food Safety and Applied Nutrition, University of Maryland, College Park, MD, USA
| | - Amir Mokhtari
- Center for Food Safety and Applied Nutrition, Food and Drug Administration, Office of Analytics and Outreach, College Park, MD, USA
- Booz Allen Hamilton, 4747 Bethesda Ave, Bethesda, MD, 20814, USA
| | - Yuhuan Chen
- Center for Food Safety and Applied Nutrition, Food and Drug Administration, Office of Analytics and Outreach, College Park, MD, USA
| | - David Oryang
- Center for Food Safety and Applied Nutrition, Food and Drug Administration, Office of Analytics and Outreach, College Park, MD, USA
| | - David T Ingram
- Center for Food Safety and Applied Nutrition, Food and Drug Administration, Office of Food Safety, College Park, MD, USA
| | - Manan Sharma
- U.S. Department of Agriculture, Agricultural Research Service, Northeast Area, Beltsville Agricultural Research Center, Environmental Microbial and Food Safety Laboratory, Beltsville, MD, USA
| | - Patricia D Millner
- U.S. Department of Agriculture, Agricultural Research Service, Northeast Area, Beltsville Agricultural Research Center, Environmental Microbial and Food Safety Laboratory, Beltsville, MD, USA
| | - Jane M Van Doren
- Center for Food Safety and Applied Nutrition, Food and Drug Administration, Office of Analytics and Outreach, College Park, MD, USA
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Manure-borne pathogens as an important source of water contamination: An update on the dynamics of pathogen survival/transport as well as practical risk mitigation strategies. Int J Hyg Environ Health 2020; 227:113524. [DOI: 10.1016/j.ijheh.2020.113524] [Citation(s) in RCA: 44] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2020] [Revised: 03/15/2020] [Accepted: 04/02/2020] [Indexed: 12/16/2022]
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10
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Nadimpalli ML, Marks SJ, Montealegre MC, Gilman RH, Pajuelo MJ, Saito M, Tsukayama P, Njenga SM, Kiiru J, Swarthout J, Islam MA, Julian TR, Pickering AJ. Urban informal settlements as hotspots of antimicrobial resistance and the need to curb environmental transmission. Nat Microbiol 2020; 5:787-795. [PMID: 32467623 DOI: 10.1038/s41564-020-0722-0] [Citation(s) in RCA: 82] [Impact Index Per Article: 20.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2019] [Accepted: 04/07/2020] [Indexed: 12/24/2022]
Abstract
Antimicrobial resistance (AMR) is a growing public health challenge that is expected to disproportionately burden lower- and middle-income countries (LMICs) in the coming decades. Although the contributions of human and veterinary antibiotic misuse to this crisis are well-recognized, environmental transmission (via water, soil or food contaminated with human and animal faeces) has been given less attention as a global driver of AMR, especially in urban informal settlements in LMICs-commonly known as 'shanty towns' or 'slums'. These settlements may be unique hotspots for environmental AMR transmission given: (1) the high density of humans, livestock and vermin living in close proximity; (2) frequent antibiotic misuse; and (3) insufficient drinking water, drainage and sanitation infrastructure. Here, we highlight the need for strategies to disrupt environmental AMR transmission in urban informal settlements. We propose that water and waste infrastructure improvements tailored to these settings should be evaluated for their effectiveness in limiting environmental AMR dissemination, lowering the community-level burden of antimicrobial-resistant infections and preventing antibiotic misuse. We also suggest that additional research is directed towards developing economic and legal incentives for evaluating and implementing water and waste infrastructure in these settings. Given that almost 90% of urban population growth will occur in regions predicted to be most burdened by the AMR crisis, there is an urgent need to build effective, evidence-based policies that could influence massive investments in the built urban environment in LMICs over the next few decades.
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Affiliation(s)
- Maya L Nadimpalli
- Department of Civil and Environmental Engineering, Tufts University, Medford, MA, USA.,Center for Integrated Management of Antimicrobial Resistance (CIMAR), Tufts University, Boston, MA, USA
| | - Sara J Marks
- Eawag, Swiss Federal Institute of Aquatic Science and Technology, Dübendorf, Switzerland
| | | | - Robert H Gilman
- Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, MA, USA.,Facultad de Ciencias y Filosofía, Universidad Peruana Cayetano Heredia, Lima, Peru
| | - Monica J Pajuelo
- Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, MA, USA.,Facultad de Ciencias y Filosofía, Universidad Peruana Cayetano Heredia, Lima, Peru
| | - Mayuko Saito
- Department of Virology, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Pablo Tsukayama
- Facultad de Ciencias y Filosofía, Universidad Peruana Cayetano Heredia, Lima, Peru.,Instituto de Medicina Tropical 'Alexander von Humboldt', Universidad Peruana Cayetano Heredia, Lima, Peru
| | | | - John Kiiru
- Kenya Medical Research Institute, Nairobi, Kenya
| | - Jenna Swarthout
- Department of Civil and Environmental Engineering, Tufts University, Medford, MA, USA
| | - Mohammad Aminul Islam
- Paul G. Allen School for Global Animal Health, Washington State University, Pullman, WA, USA.,International Centre for Diarrhoeal Disease Research, Bangladesh (ICDDR,B), Dhaka, Bangladesh
| | - Timothy R Julian
- Eawag, Swiss Federal Institute of Aquatic Science and Technology, Dübendorf, Switzerland.,Swiss Tropical and Public Health Institute, Basel, Switzerland.,University of Basel, Basel, Switzerland
| | - Amy J Pickering
- Department of Civil and Environmental Engineering, Tufts University, Medford, MA, USA. .,Center for Integrated Management of Antimicrobial Resistance (CIMAR), Tufts University, Boston, MA, USA.
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11
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Iwu CD, Okoh AI. Preharvest Transmission Routes of Fresh Produce Associated Bacterial Pathogens with Outbreak Potentials: A Review. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2019; 16:E4407. [PMID: 31717976 PMCID: PMC6888529 DOI: 10.3390/ijerph16224407] [Citation(s) in RCA: 75] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/13/2019] [Revised: 11/03/2019] [Accepted: 11/06/2019] [Indexed: 02/07/2023]
Abstract
Disease outbreaks caused by the ingestion of contaminated vegetables and fruits pose a significant problem to human health. The sources of contamination of these food products at the preharvest level of agricultural production, most importantly, agricultural soil and irrigation water, serve as potential reservoirs of some clinically significant foodborne pathogenic bacteria. These clinically important bacteria include: Klebsiella spp., Salmonella spp., Citrobacter spp., Shigella spp., Enterobacter spp., Listeria monocytogenes and pathogenic E. coli (and E. coli O157:H7) all of which have the potential to cause disease outbreaks. Most of these pathogens acquire antimicrobial resistance (AR) determinants due to AR selective pressure within the agroecosystem and become resistant against most available treatment options, further aggravating risks to human and environmental health, and food safety. This review critically outlines the following issues with regards to fresh produce; the global burden of fresh produce-related foodborne diseases, contamination between the continuum of farm to table, preharvest transmission routes, AR profiles, and possible interventions to minimize the preharvest contamination of fresh produce. This review reveals that the primary production niches of the agro-ecosystem play a significant role in the transmission of fresh produce associated pathogens as well as their resistant variants, thus detrimental to food safety and public health.
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Affiliation(s)
- Chidozie Declan Iwu
- SAMRC Microbial Water Quality Monitoring Centre, University of Fort Hare, Alice 5700, South Africa;
- Applied and Environmental Microbiology Research Group, Department of Biochemistry and Microbiology, University of Fort Hare, Alice 5700, South Africa
| | - Anthony Ifeanyi Okoh
- SAMRC Microbial Water Quality Monitoring Centre, University of Fort Hare, Alice 5700, South Africa;
- Applied and Environmental Microbiology Research Group, Department of Biochemistry and Microbiology, University of Fort Hare, Alice 5700, South Africa
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12
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Sai CB, Srinivasan N, Zachariah JK, Dananjeyan B. Experimentation on artificial inoculation studies for persistence of shiga-like toxin-producing Escherichia coli (E. coli O157) in agricultural soils and vegetables using real-time PCR. J Food Biochem 2019; 43:e13035. [PMID: 31495947 DOI: 10.1111/jfbc.13035] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2019] [Revised: 06/26/2019] [Accepted: 07/17/2019] [Indexed: 02/06/2023]
Abstract
Diarrheagenic Escherichia coli O157 is an important reason for largest food borne inflectional outbreaks. E. coli O157 invades into the food chain through contaminated irrigation water and soil causing infectious diseases to humans. In our previous study, we have evaluated the persistence of E. coli O157 through plate count methods. However, conventional cultural procedures are less sensitive to discriminate the pathogenic strain and are time consuming. Therefore, in the present study we have enumerated the persistence of E. coli O157 in soil and vegetables using specific shiga toxin genes (stx1, stx2) through quantitative PCR. Initially, we have standardized a simple Sephadex-based DNA extraction protocol that could detect 2-3 cells/25g of vegetables. Further, quantitative PCR analysis showed a 103 fold difference in the enumeration of persistence as compared to simple plating techniques. Thus, qPCR-based persistence study can be used for rapid and accurate detection techniques for analyzing E. coli O157 contamination. PRACTICAL APPLICATIONS: Our experiment on E. coli O157 expression could be used as a scale for further studies on E. coli O157 pollution in the cropped soils, additionally the DNA extraction protocol experimented by us could be used in all sensitive quantitative assays, as it could detect the expression in lowest cell loads. However, our methodology is a more reliable and sensitive assay compared to normal cultural methods. Our experiment provides a strong evidence of persistence of E. coli O157 prevailing up to half or full cropping season.
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Affiliation(s)
- Cayalvizhi B Sai
- Crop Improvement Division, National Rice Research Institute, Cuttack, Odisha
| | - Naganandini Srinivasan
- Department of Agricultural Microbiology, Tamil Nadu Agricultural University, Coimbatore, India
| | - John Kennady Zachariah
- Department of Agricultural Microbiology, Tamil Nadu Agricultural University, Coimbatore, India
| | - Balachandar Dananjeyan
- Department of Agricultural Microbiology, Tamil Nadu Agricultural University, Coimbatore, India
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13
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Hwang HJ, Seo JH, Jeong C, Cheigh CI, Chung MS. Analysis of bacterial inactivation by intense pulsed light using a double-Weibull survival model. INNOV FOOD SCI EMERG 2019. [DOI: 10.1016/j.ifset.2019.102185] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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14
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Harrand AS, Kovac J, Carroll LM, Guariglia-Oropeza V, Kent DJ, Wiedmann M. Assembly and Characterization of a Pathogen Strain Collection for Produce Safety Applications: Pre-growth Conditions Have a Larger Effect on Peroxyacetic Acid Tolerance Than Strain Diversity. Front Microbiol 2019; 10:1223. [PMID: 31231329 PMCID: PMC6558390 DOI: 10.3389/fmicb.2019.01223] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2019] [Accepted: 05/16/2019] [Indexed: 12/21/2022] Open
Abstract
Effective control of foodborne pathogens on produce requires science-based validation of interventions and control strategies, which typically involves challenge studies with a set of bacterial strains representing the target pathogens or appropriate surrogates. In order to facilitate these types of studies, a produce-relevant strain collection was assembled to represent strains from produce outbreaks or pre-harvest environments, including Listeria monocytogenes (n = 11), Salmonella enterica (n = 23), shiga-toxin producing Escherichia coli (STEC) (n = 13), and possible surrogate organisms (n = 8); all strains were characterized by whole genome sequencing (WGS). Strain diversity was assured by including the 10 most common S. enterica serotypes, L. monocytogenes lineages I-IV, and E. coli O157 as well as selected "non-O157" STEC serotypes. As it has previously been shown that strains and genetic lineages of a pathogen may differ in their ability to survive different stress conditions, a subset of representative strains for each "pathogen group" (e.g., Salmonella, STEC) was selected and assessed for survival of exposure to peroxyacetic acid (PAA) using strains pre-grown under different conditions including (i) low pH, (ii) high salt, (iii) reduced water activity, (iv) different growth phases, (v) minimal medium, and (vi) different temperatures (21°C, 37°C). The results showed that across the three pathogen groups pre-growth conditions had a larger effect on bacterial reduction after PAA exposure as compared to strain diversity. Interestingly, bacteria exposed to salt stress (4.5% NaCl) consistently showed the least reduction after exposure to PAA; however, for STEC, strains pre-grown at 21°C were as tolerant to PAA exposure as strains pre-grown under salt stress. Overall, our data suggests that challenge studies conducted with multi-strain cocktails (pre-grown under a single specific condition) may not necessarily reflect the relevant phenotypic range needed to appropriately assess different intervention strategies.
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Affiliation(s)
| | - Jasna Kovac
- Department of Food Science, Pennsylvania State University, University Park, PA, United States
| | - Laura M. Carroll
- Department of Food Science, Cornell University, Ithaca, NY, United States
| | | | - David J. Kent
- Department of Statistical Science, Cornell University, Ithaca, NY, United States
| | - Martin Wiedmann
- Department of Food Science, Cornell University, Ithaca, NY, United States
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15
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Pushpakanth P, John Kennedy Z, Balachandar D. Source tracking of Shiga-like toxin-producing Escherichia coli in the fresh vegetable production system of South India. ANN MICROBIOL 2019. [DOI: 10.1007/s13213-019-01479-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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16
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Al-Gheethi A, Noman EA, Mohamed R, Abdullah AH, Amir Hashim MK. Microbial Risk Associated with Application of Biosolids in Agriculture. HANDBOOK OF ENVIRONMENTAL MATERIALS MANAGEMENT 2019:961-971. [DOI: 10.1007/978-3-319-73645-7_26] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/01/2023]
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17
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Alegbeleye OO, Singleton I, Sant'Ana AS. Sources and contamination routes of microbial pathogens to fresh produce during field cultivation: A review. Food Microbiol 2018; 73:177-208. [PMID: 29526204 PMCID: PMC7127387 DOI: 10.1016/j.fm.2018.01.003] [Citation(s) in RCA: 246] [Impact Index Per Article: 41.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2017] [Revised: 12/31/2017] [Accepted: 01/02/2018] [Indexed: 12/17/2022]
Abstract
Foodborne illness resulting from the consumption of contaminated fresh produce is a common phenomenon and has severe effects on human health together with severe economic and social impacts. The implications of foodborne diseases associated with fresh produce have urged research into the numerous ways and mechanisms through which pathogens may gain access to produce, thereby compromising microbiological safety. This review provides a background on the various sources and pathways through which pathogenic bacteria contaminate fresh produce; the survival and proliferation of pathogens on fresh produce while growing and potential methods to reduce microbial contamination before harvest. Some of the established bacterial contamination sources include contaminated manure, irrigation water, soil, livestock/ wildlife, and numerous factors influence the incidence, fate, transport, survival and proliferation of pathogens in the wide variety of sources where they are found. Once pathogenic bacteria have been introduced into the growing environment, they can colonize and persist on fresh produce using a variety of mechanisms. Overall, microbiological hazards are significant; therefore, ways to reduce sources of contamination and a deeper understanding of pathogen survival and growth on fresh produce in the field are required to reduce risk to human health and the associated economic consequences.
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Affiliation(s)
| | - Ian Singleton
- School of Applied Sciences, Sighthill Campus, Edinburgh Napier University, Edinburgh, UK
| | - Anderson S Sant'Ana
- Department of Food Science, Faculty of Food Engineering, University of Campinas, Campinas, São Paulo, Brazil.
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18
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Patterson L, Navarro-Gonzalez N, Jay-Russell MT, Aminabadi P, Antaki-Zukoski E, Pires AFA. Persistence ofEscherichia coliin the soil of an organic mixed crop-livestock farm that integrates sheep grazing within vegetable fields. Zoonoses Public Health 2018; 65:887-896. [DOI: 10.1111/zph.12503] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2017] [Revised: 05/16/2018] [Accepted: 06/20/2018] [Indexed: 01/15/2023]
Affiliation(s)
- Laura Patterson
- Department Population Health and Reproduction, School of Veterinary Medicine; University of California-Davis; Davis California
| | | | | | - Peiman Aminabadi
- Western Center for Food Safety; University of California-Davis; Davis California
| | | | - Alda F. A. Pires
- Department Population Health and Reproduction, School of Veterinary Medicine; University of California-Davis; Davis California
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19
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Verma P, Saharan VV, Nimesh S, Singh AP. Phenotypic and virulence traits of Escherichia coli and Salmonella strains isolated from vegetables and fruits from India. J Appl Microbiol 2018. [PMID: 29512849 DOI: 10.1111/jam.13754] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
AIMS The present study was designed to assess the phenotypic traits and virulence determinants of vegetable-/fruit-origin Escherichia coli and Salmonella strains. METHODS AND RESULTS A total of 520 fresh vegetables/fruits samples were analysed for the presence of E. coli, including Shiga toxin-producing E. coli (STEC), and Salmonella. The vegetable-/fruit-origin E. coli and Salmonella strains were further assessed for antimicrobial resistance, biofilm formation, extracellular matrix production and in vitro invasion/intracellular survivability assays. A total of 73 E. coli, including four STEC, and 26 Salmonella strains were recovered from vegetables/fruits in the present study. Most of the E. coli and Salmonella isolates were able to form biofilm with higher production of cellulose/curli-fimbriae. Furthermore, more resistance was observed in E. coli isolates (61·6%) than in Salmonella isolates (38·5%) against tested antimicrobials. Additionally, invasion/intracellular survival results showed that majority of the E. coli and Salmonella isolates were able to efficiently invade/replicate intracellularly in the human epithelial cells. CONCLUSIONS Our results demonstrate that vegetable-/fruit-origin E. coli and Salmonella significantly exhibited distinct phenotypic/virulence traits which could be linked to their plant-associated lifestyle with food safety issues. SIGNIFICANCE AND IMPACT OF THE STUDY The present study provides valuable baseline information that E. coli and Salmonella may use plants as an alternative host with significant clinical importance.
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Affiliation(s)
- P Verma
- Department of Microbiology, School of Life Science, Central University of Rajasthan, Ajmer, Rajasthan, India
| | - V V Saharan
- Department of Microbiology, School of Life Science, Central University of Rajasthan, Ajmer, Rajasthan, India
| | - S Nimesh
- Department of Biotechnology, School of Life Science, Central University of Rajasthan, Ajmer, Rajasthan, India
| | - A P Singh
- Department of Microbiology, School of Life Science, Central University of Rajasthan, Ajmer, Rajasthan, India
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20
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Al-Gheethi A, Noman EA, Mohamed R, Abdullah AH, Amir Hashim MK. Microbial Risk Associated with Application of Biosolids in Agriculture. HANDBOOK OF ENVIRONMENTAL MATERIALS MANAGEMENT 2018:1-11. [DOI: 10.1007/978-3-319-58538-3_26-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/12/2017] [Accepted: 11/28/2017] [Indexed: 09/02/2023]
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21
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Reed-Jones NL, Marine SC, Everts KL, Micallef SA. Effects of Cover Crop Species and Season on Population Dynamics of Escherichia coli and Listeria innocua in Soil. Appl Environ Microbiol 2016; 82:1767-1777. [PMID: 26729724 PMCID: PMC4784030 DOI: 10.1128/aem.03712-15] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2015] [Accepted: 12/30/2015] [Indexed: 11/20/2022] Open
Abstract
Cover crops provide several ecosystem services, but their impact on enteric bacterial survival remains unexplored. The influence of cover cropping on foodborne pathogen indicator bacteria was assessed in five cover crop/green manure systems: cereal rye, hairy vetch, crimson clover, hairy vetch-rye and crimson clover-rye mixtures, and bare ground. Cover crop plots were inoculated with Escherichia coli and Listeria innocua in the fall of 2013 and 2014 and tilled into the soil in the spring to form green manure. Soil samples were collected and the bacteria enumerated. Time was a factor for all bacterial populations studied in all fields (P < 0.001). E. coli levels declined when soil temperatures dipped to <5°C and were detected only sporadically the following spring. L. innocua diminished somewhat but persisted, independently of season. In an organic field, the cover crop was a factor for E. coli in year 1 (P = 0.004) and for L. innocua in year 2 (P = 0.011). In year 1, E. coli levels were highest in the rye and hairy vetch-rye plots. In year 2, L. innocua levels were higher in hairy vetch-rye (P = 0.01) and hairy vetch (P = 0.03) plots than in the rye plot. Bacterial populations grew (P < 0.05) or remained the same 4 weeks after green manure incorporation, although initial reductions in L. innocua numbers were observed after tilling (P < 0.05). Green manure type was a factor only for L. innocua abundance in a transitional field (P < 0.05). Overall, the impacts of cover crops/green manures on bacterial population dynamics in soil varied, being influenced by bacterial species, time from inoculation, soil temperature, rainfall, and tillage; this reveals the need for long-term studies.
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Affiliation(s)
- Neiunna L Reed-Jones
- Department of Plant Science and Landscape Architecture, University of Maryland, College Park, Maryland, USA
| | - Sasha Cahn Marine
- Department of Plant Science and Landscape Architecture, University of Maryland, Lower Eastern Shore Research and Education Center, Salisbury, Maryland, USA
| | - Kathryne L Everts
- Department of Plant Science and Landscape Architecture, University of Maryland, Lower Eastern Shore Research and Education Center, Salisbury, Maryland, USA
- University of Delaware, Carvel Research and Education Center, Georgetown, Delaware, USA
| | - Shirley A Micallef
- Department of Plant Science and Landscape Architecture, University of Maryland, College Park, Maryland, USA
- Center for Food Safety and Security Systems, University of Maryland, College Park, Maryland, USA
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