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Ricardo Dos Santos Correia P, Duarte de Freitas J, André Zeoly L, Silva Porto R, José da Paz Lima D. Discovery and structure-activity relationship of Morita-Baylis-Hillman adducts as larvicides against dengue mosquito vector, Aedes aegypti (Diptera: Culicidae). Bioorg Med Chem 2023; 90:117315. [PMID: 37253304 DOI: 10.1016/j.bmc.2023.117315] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2023] [Revised: 04/24/2023] [Accepted: 05/02/2023] [Indexed: 06/01/2023]
Abstract
Neglected tropical diseases (NTDs) have become a significant public health problem worldwide, notably the life-threatening dengue hemorrhagic fever borne by the Aedes aegypti mosquito. Thus, mosquito vector control measures remain essential in public health vector surveillance and control to combat Aedes-borne infections. Therefore, a series of MBH adducts were synthesized and assessed towards the fourth instar mosquito larvae, Aedes aegypti, along with the preliminary structure-activity relationship (SAR). Noteworthy, this compound class might be synthetized by an efficient eco-friendly synthesismethod and a rapid route for the synthesis of commercial larvicide through a single synthetic step. The bioassays showed that this compound class is a promising larvicide to control Aedes aegypti mosquito larvae, mainly 3g, with an LC50 of 41.35 µg/mL, which was higher than evaluated positive controls. Nevertheless, it is a viable larvicidalhit candidate for further hit-to-leadproperties optimization of its biphenyl backbone scaffold with enhanced insecticidalbioactivity. Moreover, scanning electron microscopy analysis suggested a disruption of the osmoregulatory/ionoregulatory functions by the complete deterioration of the terminal exoskeleton hindgut and anal papillae. Therefore, this new study shows the larvicidal efficacy of the tested compounds against the Aedes aegypti larvae.
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Affiliation(s)
- Paulo Ricardo Dos Santos Correia
- Institute of Chemistry and Biotechnology, Federal University of Alagoas, Avenida Lourival Melo Mota, Maceió, Alagoas 57072-970, Brazil
| | | | - Lucas André Zeoly
- Department of Organic Chemistry, Institute of Chemistry, University of Campinas, PO Box 6154, 13083-970 Campinas, São Paulo, Brazil
| | - Ricardo Silva Porto
- Institute of Chemistry and Biotechnology, Federal University of Alagoas, Avenida Lourival Melo Mota, Maceió, Alagoas 57072-970, Brazil
| | - Dimas José da Paz Lima
- Institute of Chemistry and Biotechnology, Federal University of Alagoas, Avenida Lourival Melo Mota, Maceió, Alagoas 57072-970, Brazil.
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Engdahl CS, Caragata EP, Tavadia M, Dimopoulos G. Chromobacterium Biopesticide Exposure Does Not Select for Resistance in Aedes Mosquitoes. mBio 2023; 14:e0048023. [PMID: 37017525 PMCID: PMC10127667 DOI: 10.1128/mbio.00480-23] [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: 02/26/2023] [Accepted: 03/06/2023] [Indexed: 04/06/2023] Open
Abstract
Developing effective tools to control mosquito populations is essential for reducing the incidence of diseases like malaria and dengue. Biopesticides of microbial origin are a rich, underexplored source of mosquitocidal compounds. We previously developed a biopesticide from the bacterium Chromobacterium sp. Panama that rapidly kills vector mosquito larvae, including Aedes aegypti and Anopheles gambiae. Here, we demonstrate that two independent Ae. aegypti colonies exposed to a sublethal dose of that biopesticide over consecutive generations persistently exhibited high mortality and developmental delays, indicating that resistance did not develop during the study period. Critically, the descendants of biopesticide-exposed mosquitoes experienced decreased longevity and did not display increased susceptibility to dengue virus or decreased susceptibility to common chemical insecticides. Through RNA sequencing, we observed no link between biopesticide exposure and the increased activity of xenobiotic metabolism and detoxification genes typically associated with insecticide resistance. These findings indicate that the Chromobacterium biopesticide is an exciting, emerging mosquito control tool. IMPORTANCE Vector control is an essential part of mitigating diseases caused by pathogens that mosquitoes spread. Modern vector control is highly reliant on using synthetic insecticides to eliminate mosquito populations before they can cause disease. However, many of these populations have become resistant to commonly used insecticides. There is a strong need to explore alternative vector control strategies that aim to mitigate disease burden. Biopesticides, insecticides of biological origin, can have unique mosquitocidal activities, meaning they can effectively kill mosquitoes that are already resistant to other insecticides. We previously developed a highly effective mosquito biopesticide from the bacterium Chromobacterium sp. Csp_P. Here, we investigate whether exposure to a sublethal dose of this Csp_P biopesticide over 9 to 10 generations causes resistance to arise in Aedes aegypti mosquitoes. We find no evidence of resistance at the physiological or molecular levels, confirming that the Csp_P biopesticide is a highly promising new tool for controlling mosquito populations.
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Affiliation(s)
- Cecilia Springer Engdahl
- W. Harry Feinstone Department of Molecular Microbiology and Immunology, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, Maryland, USA
| | - Eric P. Caragata
- W. Harry Feinstone Department of Molecular Microbiology and Immunology, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, Maryland, USA
- Florida Medical Entomology Laboratory, Department of Entomology & Nematology, Institute of Food & Agricultural Sciences, University of Florida, Vero Beach, Florida, USA
| | - Mihra Tavadia
- W. Harry Feinstone Department of Molecular Microbiology and Immunology, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, Maryland, USA
| | - George Dimopoulos
- W. Harry Feinstone Department of Molecular Microbiology and Immunology, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, Maryland, USA
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da Silva EB, de Mendonça CM, Guedes DRD, Paiva MHS, Mendonça JDA, Dias ESF, Florêncio SGL, Amaral A, Netto AM, Lopes CFJA, de Melo-Santos MAV. Effects of gamma radiation on the vector competence of Aedes aegypti (diptera: Culicidae) to transmit Zika virus. Acta Trop 2023; 239:106831. [PMID: 36640923 DOI: 10.1016/j.actatropica.2023.106831] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2022] [Revised: 01/06/2023] [Accepted: 01/09/2023] [Indexed: 01/13/2023]
Abstract
One of the limitations of the Sterile Insect Technique (SIT), conventionally performed by ionizing radiation, regards separating males from females, which is not 100% effective. Some irradiated females may be released together with males in the field at SIT. The present study aimed to evaluate the influence of ionizing radiation on the ability of Aedes aegypti mosquitoes to transmit the Zika virus after exposing female pupae to a 40 Gy of gamma radiation. The results suggest that the genetic damage induced by exposure of females to this dose level promotes their total sterility, but it does not influence their vector competence. However, our data point out that ionizing radiation may decrease the proportion of infective mosquitoes.
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Affiliation(s)
- Edvane Borges da Silva
- Centro Acadêmico de Vitória (CAV), Universidade Federal de Pernambuco (UFPE), Vitoria de Santo Antão, Pernambuco, Brazil; Group of Studies in Radioprotection and Radioecology (GERAR), Department of Nuclear Energy (DEN), Postgraduate Programme in Energy and Nuclear Technologies (PROTEN), Universidade Federal de Pernambuco (UFPE), Recife, Pernambuco, Brazil.
| | - Carlos Messias de Mendonça
- Centro Acadêmico de Vitória (CAV), Universidade Federal de Pernambuco (UFPE), Vitoria de Santo Antão, Pernambuco, Brazil
| | | | - Marcelo Henrique Santos Paiva
- Department of Entomology, Aggeu Magalhães Institute/Oswaldo Cruz Foundation (IAM/Fiocruz), Recife, Pernambuco, Brazil; Centro Acadêmico do Agreste (CAA), Universidade Federal de Pernambuco (UFPE), Caruaru, Pernambuco, Brazil
| | - Jaziela de Arruda Mendonça
- Department of Entomology, Aggeu Magalhães Institute/Oswaldo Cruz Foundation (IAM/Fiocruz), Recife, Pernambuco, Brazil
| | | | - Sloana Giesta Lemos Florêncio
- Group of Studies in Radioprotection and Radioecology (GERAR), Department of Nuclear Energy (DEN), Postgraduate Programme in Energy and Nuclear Technologies (PROTEN), Universidade Federal de Pernambuco (UFPE), Recife, Pernambuco, Brazil
| | - Ademir Amaral
- Group of Studies in Radioprotection and Radioecology (GERAR), Department of Nuclear Energy (DEN), Postgraduate Programme in Energy and Nuclear Technologies (PROTEN), Universidade Federal de Pernambuco (UFPE), Recife, Pernambuco, Brazil
| | - André Maciel Netto
- Group of Studies in Radioprotection and Radioecology (GERAR), Department of Nuclear Energy (DEN), Postgraduate Programme in Energy and Nuclear Technologies (PROTEN), Universidade Federal de Pernambuco (UFPE), Recife, Pernambuco, Brazil
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Carvalho KS, Rezende TMT, Romão TP, Rezende AM, Chiñas M, Guedes DRD, Paiva-Cavalcanti M, Silva-Filha MHNL. Aedes aegypti Strain Subjected to Long-Term Exposure to Bacillus thuringiensis svar. israelensis Larvicides Displays an Altered Transcriptional Response to Zika Virus Infection. Viruses 2022; 15:72. [PMID: 36680112 PMCID: PMC9866606 DOI: 10.3390/v15010072] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2022] [Revised: 12/13/2022] [Accepted: 12/21/2022] [Indexed: 12/29/2022] Open
Abstract
Bacillus thuringiensis svar. israelensis (Bti) larvicides are effective in controlling Aedes aegypti; however, the effects of long-term exposure need to be properly evaluated. We established an Ae. aegypti strain that has been treated with Bti for 30 generations (RecBti) and is still susceptible to Bti, but females exhibited increased susceptibility to Zika virus (ZIKV). This study compared the RecBti strain to a reference strain regarding: first, the relative transcription of selected immune genes in ZIKV-challenged females (F30) with increased susceptibility detected in a previous study; then, the whole transcriptomic profile using unchallenged females (F35). Among the genes compared by RT-qPCR in the ZIKV-infected and uninfected females from RecBti (F30) and the reference strain, hop, domeless, relish 1, defensin A, cecropin D, and gambicin showed a trend of repression in RecBti infected females. The transcriptome of RecBti (F35) unchallenged females, compared with a reference strain by RNA-seq, showed a similar profile and only 59 differentially expressed genes were found among 9202 genes analyzed. Our dataset showed that the long-term Bti exposure of the RecBti strain was associated with an alteration of the expression of genes potentially involved in the response to ZIKV infection in challenged females, which is an important feature found under this condition.
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Affiliation(s)
- Karine S. Carvalho
- Aggeu Magalhães Institute, Oswaldo Cruz Foundation, Recife 50670-420, Brazil
| | | | - Tatiany P. Romão
- Aggeu Magalhães Institute, Oswaldo Cruz Foundation, Recife 50670-420, Brazil
| | - Antônio M. Rezende
- Aggeu Magalhães Institute, Oswaldo Cruz Foundation, Recife 50670-420, Brazil
| | - Marcos Chiñas
- Center for Genomic Sciences, National Autonomous University of Mexico, Cuernavaca 62210, Mexico
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Alomar AA, Eastmond BH, Rapti Z, Walker ED, Alto BW. Ingestion of spinosad-containing toxic sugar bait alters Aedes albopictus vector competence and vectorial capacity for dengue virus. Front Microbiol 2022; 13:933482. [PMID: 36090120 PMCID: PMC9459233 DOI: 10.3389/fmicb.2022.933482] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2022] [Accepted: 08/05/2022] [Indexed: 12/01/2022] Open
Abstract
Dengue virus (DENV) is a highly prevalent vector-borne virus that causes life-threatening illnesses to humans worldwide. The development of a tool to control vector populations has the potential to reduce the burden of DENV. Toxic sugar bait (TSB) provides a form of vector control that takes advantage of the sugar-feeding behavior of adult mosquitoes. However, studies on the effect of ingestion of toxins in TSB on vector competence and vectorial capacity for viruses are lacking. This study evaluated vector competence for DENV serotype-1 of Aedes albopictus at 7 and 14 days post-ingestion of TSB formulated with spinosad (of bacteria origin) as an oral toxin. Our results and others were modeled to estimate effects on Ae. albopictus vectorial capacity for DENV. Ingestion of TSB caused a reduction in survival of females, but increased mosquito susceptibility to DENV infection, disseminated infection, and transmission. However, this increase in vector competence was obviated by the reduction in survival, leading to a lower predicted vectorial capacity. The findings of this study highlight the importance of evaluating the net impact of TSB ingestion on epidemiological parameters of vectorial capacity in the context of vector control efforts to reduce the risk of transmission of vector-borne viruses.
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Affiliation(s)
- Abdullah A. Alomar
- Florida Medical Entomology Laboratory, University of Florida, Vero Beach, FL, United States
- *Correspondence: Abdullah A. Alomar,
| | - Bradley H. Eastmond
- Florida Medical Entomology Laboratory, University of Florida, Vero Beach, FL, United States
| | - Zoi Rapti
- Carl R. Woese Institute for Genomic Biology, University of Illinois at Urbana-Champaign, Urbana, IL, United States
- Department of Mathematics, University of Illinois at Urbana-Champaign, Urbana, IL, United States
| | - Edward D. Walker
- Department of Entomology, Michigan State University, East Lansing, MI, United States
- Department of Microbiology and Molecular Genetics, Michigan State University, East Lansing, MI, United States
| | - Barry W. Alto
- Florida Medical Entomology Laboratory, University of Florida, Vero Beach, FL, United States
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Alam I, Batool K, Idris AL, Tan W, Guan X, Zhang L. Role of Lectin in the Response of Aedes aegypti Against Bt Toxin. Front Immunol 2022; 13:898198. [PMID: 35634312 PMCID: PMC9136036 DOI: 10.3389/fimmu.2022.898198] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2022] [Accepted: 04/19/2022] [Indexed: 12/05/2022] Open
Abstract
Aedes aegypti is one of the world’s most dangerous mosquitoes, and a vector of diseases such as dengue fever, chikungunya virus, yellow fever, and Zika virus disease. Currently, a major global challenge is the scarcity of antiviral medicine and vaccine for arboviruses. Bacillus thuringiensis var israelensis (Bti) toxins are used as biological mosquito control agents. Endotoxins, including Cry4Aa, Cry4Ba, Cry10Aa, Cry11Aa, and Cyt1Aa, are toxic to mosquitoes. Insect eradication by Cry toxin relies primarily on the interaction of cry toxins with key toxin receptors, such as aminopeptidase (APN), alkaline phosphatase (ALP), cadherin (CAD), and ATP-binding cassette transporters. The carbohydrate recognition domains (CRDs) of lectins and domains II and III of Cry toxins share similar structural folds, suggesting that midgut proteins, such as C-type lectins (CTLs), may interfere with interactions among Cry toxins and receptors by binding to both and alter Cry toxicity. In the present review, we summarize the functional role of C-type lectins in Ae. aegypti mosquitoes and the mechanism underlying the alteration of Cry toxin activity by CTLs. Furthermore, we outline future research directions on elucidating the Bti resistance mechanism. This study provides a basis for understanding Bti resistance, which can be used to develop novel insecticides.
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Affiliation(s)
- Intikhab Alam
- State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou, China
- Key Lab of Biopesticides and Chemical Biology, MOE, Fujian Agriculture and Forestry University, Fuzhou, China
- College of Life Sciences, South China Agricultural University, Guangzhou, China
| | - Khadija Batool
- State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou, China
- Key Lab of Biopesticides and Chemical Biology, MOE, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Aisha Lawan Idris
- State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou, China
- Key Lab of Biopesticides and Chemical Biology, MOE, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Weilong Tan
- Nanjing Bioengineering (Gene) Technology Center for Medicines, Nanjing, China
| | - Xiong Guan
- State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou, China
- Key Lab of Biopesticides and Chemical Biology, MOE, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Lingling Zhang
- State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou, China
- Key Lab of Biopesticides and Chemical Biology, MOE, Fujian Agriculture and Forestry University, Fuzhou, China
- *Correspondence: Lingling Zhang,
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