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Guo Y, Zhang T, Wang X, Zhang J, Miao W, Li QX, Fan Y. Toxic effects of the insecticide tolfenpyrad on zebrafish embryos: Cardiac toxicity and mitochondrial damage. ENVIRONMENTAL TOXICOLOGY 2024; 39:2583-2595. [PMID: 38205909 DOI: 10.1002/tox.24133] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/15/2023] [Revised: 12/07/2023] [Accepted: 12/25/2023] [Indexed: 01/12/2024]
Abstract
Tolfenpyrad, a highly effective and broad-spectrum insecticide and acaricide extensively utilized in agriculture, presents a potential hazard to nontarget organisms. This study was designed to explore the toxic mechanisms of tolfenpyrad on zebrafish embryos. Between 24 and 96 h after exposure of the fertilized embryos to tolfenpyrad at concentrations ranging from 0.001 to 0.016 mg/L (96 h-LC50 = 0.017 mg/L), lethal effects were apparent, accompanied with notable anomalies including pericardial edema, increased pericardial area, diminished heart rate, and an elongated distance between the venous sinus and the arterial bulb. Tolfenpyrad elicited noteworthy alterations in the expression of genes pertinent to cardiac development and apoptosis, with the most pronounced changes observed in the cardiac development-related genes of bone morphogenetic protein 2b (bmp2b) and p53 upregulated modulator of apoptosis (puma). The findings underscore that tolfenpyrad induces severe cardiac toxicity and mitochondrial damage in zebrafish embryos. This data is imperative for a comprehensive assessment of tolfenpyrad risks to aquatic ecosystems, particularly considering the limited knowledge regarding its detrimental impact on aquatic vertebrates.
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Affiliation(s)
- Yuzhao Guo
- Key Laboratory of Green Prevention and Control of Tropical Agriculture and Forestry Disasters, College of Plant Protection, Hainan University, Haikou, Hainan, China
| | - Taiyu Zhang
- Key Laboratory of Green Prevention and Control of Tropical Agriculture and Forestry Disasters, College of Plant Protection, Hainan University, Haikou, Hainan, China
| | - Xinyu Wang
- Key Laboratory of Green Prevention and Control of Tropical Agriculture and Forestry Disasters, College of Plant Protection, Hainan University, Haikou, Hainan, China
| | - Jie Zhang
- Key Laboratory of Green Prevention and Control of Tropical Agriculture and Forestry Disasters, College of Plant Protection, Hainan University, Haikou, Hainan, China
| | - Weiguo Miao
- Key Laboratory of Green Prevention and Control of Tropical Agriculture and Forestry Disasters, College of Plant Protection, Hainan University, Haikou, Hainan, China
| | - Qing X Li
- Department of Molecular Biosciences and Bioengineering, University of Hawaii at Manoa, Honolulu, Hawaii, USA
| | - Yongmei Fan
- Key Laboratory of Green Prevention and Control of Tropical Agriculture and Forestry Disasters, College of Plant Protection, Hainan University, Haikou, Hainan, China
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Clarke A, Llabona IM, Khalid N, Hulvey D, Irvin A, Adams N, Heine HS, Eshraghi A. Tolfenpyrad displays Francisella-targeted antibiotic activity that requires an oxidative stress response regulator for sensitivity. Microbiol Spectr 2023; 11:e0271323. [PMID: 37800934 PMCID: PMC10848828 DOI: 10.1128/spectrum.02713-23] [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: 07/10/2023] [Accepted: 09/05/2023] [Indexed: 10/07/2023] Open
Abstract
IMPORTANCE Francisella species are highly pathogenic bacteria that pose a threat to global health security. These bacteria can be made resistant to antibiotics through facile methods, and we lack a safe and protective vaccine. Given their history of development as bioweapons, new treatment options must be developed to bolster public health preparedness. Here, we report that tolfenpyrad, a pesticide that is currently in use worldwide, effectively inhibits the growth of Francisella. This drug has an extensive history of use and a plethora of safety and toxicity data, making it a good candidate for development as an antibiotic. We identified mutations in Francisella novicida that confer resistance to tolfenpyrad and characterized a transcriptional regulator that is required for sensitivity to both tolfenpyrad and reactive oxygen species.
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Affiliation(s)
- Ashley Clarke
- Department of Infectious Diseases & Immunology, University of Florida, Gainesville, Florida, USA
| | - Isabelle M. Llabona
- Department of Infectious Diseases & Immunology, University of Florida, Gainesville, Florida, USA
| | - Nimra Khalid
- Department of Infectious Diseases & Immunology, University of Florida, Gainesville, Florida, USA
| | - Danielle Hulvey
- Department of Infectious Diseases & Immunology, University of Florida, Gainesville, Florida, USA
| | - Alexis Irvin
- Department of Infectious Diseases & Immunology, University of Florida, Gainesville, Florida, USA
| | - Nicole Adams
- Department of Infectious Diseases & Immunology, University of Florida, Gainesville, Florida, USA
| | - Henry S. Heine
- Institute for Therapeutic Innovation, University of Florida, Orlando, Florida, USA
| | - Aria Eshraghi
- Department of Infectious Diseases & Immunology, University of Florida, Gainesville, Florida, USA
- Emerging Pathogens Institute, University of Florida, Gainesville, Florida, USA
- Department of Oral Biology, University of Florida, Gainesville, Florida, USA
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Lin Y, Huang Y, Liu J, Liu L, Cai X, Lin J, Shu B. Characterization of the physiological, histopathological, and gene expression alterations in Spodoptera frugiperda larval midguts affected by toosendanin exposure. PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY 2023; 195:105537. [PMID: 37666609 DOI: 10.1016/j.pestbp.2023.105537] [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: 06/13/2023] [Revised: 07/13/2023] [Accepted: 07/13/2023] [Indexed: 09/06/2023]
Abstract
The fall armyworm, Spodoptera frugiperda, is a polyphagous pest worldwide and feeds on many grain and cash crops, which threatens the safety of agriculture and forestry production. Toosendanin (TSN) is a commercial insecticidal active ingredient used to manage various pests in the field and showed adverse effects against S. frugiperda, while the effects of TSN on the larval midguts are not yet known. In this study, the effects of 10 and 20 mg/kg TSN exposures on the larval midguts were analyzed. The structural changes of the larval midgut induced by TSN treatments were also determined by hematoxylin-eosin staining. Besides, TSN treatments also changed the enzyme activities of three digestive enzymes (α-amylase, lipase, and trypsin) and two detoxification enzymes (CarE and GST). A total of 2868 differentially expressed genes (DEGs) were identified by RNA-Seq in the larval midguts with 20 mg/kg TSN treatment, and the DEGs responsible for food digestion and detoxification were further examined. Our findings revealed the preliminary modes of action of TSN on the larval midguts of S. frugiperda, which provide a preliminary rationale for controlling S. frugiperda with TSN in the field.
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Affiliation(s)
- Yanzheng Lin
- Guangzhou City Key Laboratory of Subtropical Fruit Trees Outbreak Control, Zhongkai University of Agriculture and Engineering, Guangzhou, China
| | - Yuting Huang
- Guangzhou City Key Laboratory of Subtropical Fruit Trees Outbreak Control, Zhongkai University of Agriculture and Engineering, Guangzhou, China
| | - Jiafu Liu
- Guangzhou City Key Laboratory of Subtropical Fruit Trees Outbreak Control, Zhongkai University of Agriculture and Engineering, Guangzhou, China
| | - Luyang Liu
- Guangzhou City Key Laboratory of Subtropical Fruit Trees Outbreak Control, Zhongkai University of Agriculture and Engineering, Guangzhou, China
| | - Xueming Cai
- Guangzhou City Key Laboratory of Subtropical Fruit Trees Outbreak Control, Zhongkai University of Agriculture and Engineering, Guangzhou, China
| | - Jintian Lin
- Guangzhou City Key Laboratory of Subtropical Fruit Trees Outbreak Control, Zhongkai University of Agriculture and Engineering, Guangzhou, China.
| | - Benshui Shu
- Guangzhou City Key Laboratory of Subtropical Fruit Trees Outbreak Control, Zhongkai University of Agriculture and Engineering, Guangzhou, China.
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Feng D, Wu S, Jiang B, He S, Luo Y, Li F, Song B, Song R. Discovery of Novel Isoxazoline Derivatives Containing Diaryl Ether against Fall Armyworms. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2023; 71:6859-6870. [PMID: 37126004 DOI: 10.1021/acs.jafc.3c00824] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
With the continuous evolution of insect resistance, it is a tremendous challenge to control the fall armyworm (Spodoptera frugiperda) with traditional insecticides. To solve this pending issue, a series of novel isoxazoline derivatives containing diaryl ether structures were designed and synthesized, and most of the target compounds exhibited excellent insecticidal activity. Based on the three-dimensional quantitative structure-activity relationship (3D-QSAR) model analysis, we further optimized the molecular structure with compound L35 obtained and tested for its activity. Compound L35 (LC50 = 1.69 mg/L) exhibited excellent insecticidal activity against S. frugiperda, which was better than those of commercial fipronil (LC50 = 70.78 mg/L) and indoxacarb (LC50 = 5.37 mg/L). The enzyme-linked immunosorbent assay showed that L35 could upregulate the levels of GABA in insects. In addition, molecular docking and transcriptomic results also indicated that compound L35 may affect the nervous system of S. frugiperda by acting on GABA receptors. Notably, through high-performance liquid chromatography (HPLC), we were able to obtain the two enantiomers of compound L35, and the insecticidal activity test revealed that S-(+)-L35 was 44 times more active than R-(-)-L35 against S. frugiperda. This study established the chemistry basis and mechanistic foundations for the future development of pesticide candidates against fall armyworms.
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Affiliation(s)
- Di Feng
- National Key Laboratory of Green Pesticide, Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Center for R&D of Fine Chemicals of Guizhou University, Guiyang 550025, P.R. China
| | - Shang Wu
- National Key Laboratory of Green Pesticide, Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Center for R&D of Fine Chemicals of Guizhou University, Guiyang 550025, P.R. China
| | - Biaobiao Jiang
- National Key Laboratory of Green Pesticide, Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Center for R&D of Fine Chemicals of Guizhou University, Guiyang 550025, P.R. China
| | - Siqi He
- National Key Laboratory of Green Pesticide, Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Center for R&D of Fine Chemicals of Guizhou University, Guiyang 550025, P.R. China
| | - Yuqin Luo
- National Key Laboratory of Green Pesticide, Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Center for R&D of Fine Chemicals of Guizhou University, Guiyang 550025, P.R. China
| | - Fangyi Li
- National Key Laboratory of Green Pesticide, Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Center for R&D of Fine Chemicals of Guizhou University, Guiyang 550025, P.R. China
| | - Baoan Song
- National Key Laboratory of Green Pesticide, Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Center for R&D of Fine Chemicals of Guizhou University, Guiyang 550025, P.R. China
| | - Runjiang Song
- National Key Laboratory of Green Pesticide, Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Center for R&D of Fine Chemicals of Guizhou University, Guiyang 550025, P.R. China
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