Adaptation of Aedes aegypti to salinity: Characterized by larger anal papillae in larvae

Surendran, Sinnathamby N.; Sivabalakrishnan, Kokila; Jayadas, Tibutius T. P.; Santhirasegaram, S.; Laheetharan, A.; Senthilnanthanan, Meena; Ramasamy, Ranjan

doi:10.4103/0972-9062.249482

Cited by 14 publications

(9 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…O controle do Aedes aegypti em ambiente urbano continua sendo um grande desafio mundial. A grande capacidade de adaptação do mosquito, alterações em seus hábitos de vida como oviposição em água insalubre, alterações de horário de repasto sanguíneo e resistência a inseticidas estão entre algumas dificuldades encontradas [12][13][14][15] .…”

Section: Discussionunclassified

Efetividade do uso de capas em reservatórios de água para prevenção de Aedes aegypti

et al. 2020

View full text Add to dashboard Cite

Introdução: a intermitência ou deficiência da oferta de água pode ser considerada uma condição de vulnerabilidade para a reprodução do Aedes aegypti. Objetivo: avaliar a efetividade do uso de capas para proteção de reservatório de água, como estratégia de controle do Aedes aegypti. Metodologia: estudo de intervenção não controlado, realizado entre os anos 2015 e 2016, em um bairro do município de Riachão do Jacuípe, localizado na macrorregião centro-leste do estado da Bahia, Brasil. A coleta de dados aconteceu em quatro momentos: visita inicial para avaliação da necessidade de capas e pesquisa de larvas nos reservatórios existentes, seguida de três visitas para monitoramento e inspeção dos reservatórios de água beneficiados com as capas protetoras. O tratamento químico foi aplicado, quando necessário. As visitas foram realizadas durante nove meses, com intervalos de 45 a 60 dias. O estudo foi aprovado pelo CEP/UNEB, Parecer número 1.066.424, CAAE 33095114.0.0000.0057. Resultados: foram pesquisados 273 reservatórios de água (capacidade de 200L, 250L, 500L e 1000L) destes, 87,2% permaneceram com as capas em todas as três visitas de monitoramento. Entre os que apresentaram larvas de mosquitos, incluindo Aedes aegypti, 55,6% não apresentavam capa ou estavam dispostas de maneira inadequada. Observou-se, também, incremento de positividade da presença de larvas entre aqueles que se encontravam com capas colocadas, adequadamente, no momento da visita. Conclusão: a aplicação de capas de poliéster em reservatórios de água como estratégia de controle vetorial pode não ser efetiva se não ocorrer uma vigilância constante sobre o uso correto.

show abstract

Section: Discussionunclassified

Efetividade do uso de capas em reservatórios de água para prevenção de Aedes aegypti

et al. 2020

View full text Add to dashboard Cite

show abstract

“…Both transient and inheritable changes in larval salinity tolerance were observed in Ae. aegypti adapting to salinity [31, 32]. Increased activities of GST and MO were reported in Ae.…”

Section: Discussionmentioning

confidence: 99%

Development of the major arboviral vector Aedes aegypti in urban drain-water and associated pyrethroid insecticide resistance is a potential global health challenge

et al. 2019

View full text Add to dashboard Cite

Background Aedes aegypti were found developing in the water in open public drains (drain-water, DW) in Jaffna city in northern Sri Lanka, a location where the arboviral diseases dengue and chikungunya are endemic. Methods Susceptibilities to the common insecticides dichlorodiphenyltrichloroethane (DDT), malathion, propoxur, permethrin and deltamethrin and activities of the insecticide-detoxifying enzymes carboxylesterase (EST), glutathione S-transferase (GST) and monooxygenase (MO) were compared in adult Ae. aegypti developing in DW and fresh water (FW). Results DW Ae. aegypti were resistant to the pyrethroids deltamethrin and permethrin, while FW Ae. aegypti were susceptible to deltamethrin but possibly resistant to permethrin. Both DW and FW Ae. aegypti were resistant to DDT, malathion and propoxur. Greater pyrethroid resistance in DW Ae. aegypti was consistent with higher GST and MO activities. Conclusions The results demonstrate the potential for insecticide resistance developing in Ae. aegypti adapted to DW. Urbanization in arboviral disease-endemic countries is characterized by a proliferation of open water drains and therefore the findings identify a potential new challenge to global health.

show abstract

“…aegypti larvae from FW adapted populations occur when these larvae are transferred to BW [ 16 – 18 ]. These alterations suggest a reduction in ion uptake activity when larvae are placed in BW; however, alterations of anal papillae size in response to BW depend on whether larvae come from a population adapted to FW or BW [ 18 ]. Differences in aquaporin (water channel) expression have also been documented in the anal papillae of A .…”

Section: Introductionmentioning

confidence: 99%

“…The anal papillae are external organs in direct contact with the water and in freshwater they are responsible for uptake of ions and water [11][12][13][14][15]. Studies have demonstrated that changes in the structure and function of anal papillae of A. aegypti larvae from FW adapted populations occur when these larvae are transferred to BW [16][17][18]. These alterations suggest a reduction in ion uptake activity when larvae are placed in BW; however, alterations of anal papillae size in response to BW depend on whether larvae come from a population adapted to FW or BW [18].…”

Section: Introductionmentioning

confidence: 99%

“…Studies have demonstrated that changes in the structure and function of anal papillae of A. aegypti larvae from FW adapted populations occur when these larvae are transferred to BW [16][17][18]. These alterations suggest a reduction in ion uptake activity when larvae are placed in BW; however, alterations of anal papillae size in response to BW depend on whether larvae come from a population adapted to FW or BW [18]. Differences in aquaporin (water channel) expression have also been documented in the anal papillae of A. aegypti larvae that develop in BW compared with those in FW but the functional significance remains to be studied [19].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A comparison of aquaporin expression in mosquito larvae (Aedes aegypti) that develop in hypo-osmotic freshwater and iso-osmotic brackish water

et al. 2020

View full text Add to dashboard Cite

The mosquito Aedes aegypti vectors the arboviral diseases yellow fever, dengue, Zika and chikungunya. Larvae are usually found developing in freshwater; however, more recently they have been increasingly found in brackish water, potential habitats which are traditionally ignored by mosquito control programs. Aedes aegypti larvae are osmo-regulators maintaining their hemolymph osmolarity in a range of ~ 250 to 300 mOsmol l -1 . In freshwater, the larvae must excrete excess water while conserving ions while in brackish water, they must alleviate an accumulation of salts. The compensatory physiological mechanisms must involve the transport of ions and water but little is known about the water transport mechanisms in the osmoregulatory organs of these larvae. Water traverses cellular membranes predominantly through transmembrane proteins named aquaporins (AQPs) and Aedes aegypti possesses 6 AQP homologues (AaAQP1 to 6). The objective of this study was to determine if larvae that develop in freshwater or brackish water have differential aquaporin expression in osmoregulatory organs, which could inform us about the relative importance and function of aquaporins to mosquito survival under these different osmotic conditions. We found that AaAQP transcript abundance was similar in organs of freshwater and brackish water mosquito larvae. Furthermore, in the Malpighian tubules and hindgut AaAQP protein abundance was unaffected by the rearing conditions, but in the gastric caeca the protein level of one aquaporin, AaAQP1 was elevated in brackish water. We found that AaAQP1 was expressed apically while AaAQP4 and AaAQP5 were found to be apical and/or basal in the epithelia of osmoregulatory organs. Overall, the results suggest that aquaporin expression in the osmoregulatory organs is mostly consistent between larvae that are developing in freshwater and brackish water. This suggests that aquaporins may not have major roles in adapting to longterm survival in brackish water or that aquaporin function may be regulated by other mechanisms like post-translational modifications.

show abstract

Adaptation of Aedes aegypti to salinity: Characterized by larger anal papillae in larvae

Cited by 14 publications

References 1 publication

Efetividade do uso de capas em reservatórios de água para prevenção de Aedes aegypti

Efetividade do uso de capas em reservatórios de água para prevenção de Aedes aegypti

Development of the major arboviral vector Aedes aegypti in urban drain-water and associated pyrethroid insecticide resistance is a potential global health challenge

A comparison of aquaporin expression in mosquito larvae (Aedes aegypti) that develop in hypo-osmotic freshwater and iso-osmotic brackish water

Contact Info

Product

Resources

About