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Larvicidal Compounds Extracted from Helicteres velutina K. Schum (Sterculiaceae) Evaluated against Aedes aegypti L.

Helicteres velutina K. Schum (Sterculiaceae), a member of Malvaceae sensu lato, is a Brazilian endemic plant that has been used by the indigenous tribe Pankarare as an insect repellent. A previous study has reported the isolation of terpenoids, flavonoids and pheophytins, in addition to the larvicid...

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Autores principales: Fernandes, Diégina A., Barros, Renata P. C., Teles, Yanna C. F., Oliveira, Louise H. G., Lima, Jéssica B., Scotti, Marcus T., Nunes, Fabíola C., Conceição, Adilva S., Vanderlei de Souza, Maria de Fátima
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6631904/
https://www.ncbi.nlm.nih.gov/pubmed/31234501
http://dx.doi.org/10.3390/molecules24122315
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author Fernandes, Diégina A.
Barros, Renata P. C.
Teles, Yanna C. F.
Oliveira, Louise H. G.
Lima, Jéssica B.
Scotti, Marcus T.
Nunes, Fabíola C.
Conceição, Adilva S.
Vanderlei de Souza, Maria de Fátima
author_facet Fernandes, Diégina A.
Barros, Renata P. C.
Teles, Yanna C. F.
Oliveira, Louise H. G.
Lima, Jéssica B.
Scotti, Marcus T.
Nunes, Fabíola C.
Conceição, Adilva S.
Vanderlei de Souza, Maria de Fátima
author_sort Fernandes, Diégina A.
collection PubMed
description Helicteres velutina K. Schum (Sterculiaceae), a member of Malvaceae sensu lato, is a Brazilian endemic plant that has been used by the indigenous tribe Pankarare as an insect repellent. A previous study has reported the isolation of terpenoids, flavonoids and pheophytins, in addition to the larvicidal activity of crude H. velutina extracts derived from the aerial components (leaves, branches/twigs, and flowers). The present study reports the biomonitoring of the effects of fractions and isolated compounds derived from H. velutina against A. aegypti fourth instar larvae. A crude ethanol extract was submitted to liquid–liquid extraction with hexane, dichloromethane, ethyl acetate and n-butanol to obtain their respective fractions. Larvicidal evaluations of the fractions were performed, and the hexane and dichloromethane fractions exhibited greater activities than the other fractions, with LC(50) (50% lethal concentration) values of 3.88 and 5.80 mg/mL, respectively. The phytochemical study of these fractions resulted in the isolation and identification of 17 compounds. The molecules were subjected to a virtual screening protocol, and five molecules presented potential larvicidal activity after analyses of their applicability domains. When molecular docking was analysed, only three of these compounds showed an ability to bind with sterol carrier protein-2 (1PZ4), a protein found in the larval intestine. The compounds tiliroside and 7,4′-di-O-methyl-8-O-sulphate flavone showed in vitro larvicidal activity, with LC(50) values of 0.275 mg/mL after 72 h and 0.182 mg/mL after 24 h of exposure, respectively. This is the first study to demonstrate the larvicidal activity of sulphated flavonoids against A. aegypti. Our results showed that the presence of the OSO(3)H group attached to C-8 of the flavonoid was crucial to the larvicidal activity. This research supports the traditional use of H. velutina as an alternative insecticide for the control of A. aegypti, which is a vector for severe arboviruses, such as dengue and chikungunya.
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spelling pubmed-66319042019-08-19 Larvicidal Compounds Extracted from Helicteres velutina K. Schum (Sterculiaceae) Evaluated against Aedes aegypti L. Fernandes, Diégina A. Barros, Renata P. C. Teles, Yanna C. F. Oliveira, Louise H. G. Lima, Jéssica B. Scotti, Marcus T. Nunes, Fabíola C. Conceição, Adilva S. Vanderlei de Souza, Maria de Fátima Molecules Article Helicteres velutina K. Schum (Sterculiaceae), a member of Malvaceae sensu lato, is a Brazilian endemic plant that has been used by the indigenous tribe Pankarare as an insect repellent. A previous study has reported the isolation of terpenoids, flavonoids and pheophytins, in addition to the larvicidal activity of crude H. velutina extracts derived from the aerial components (leaves, branches/twigs, and flowers). The present study reports the biomonitoring of the effects of fractions and isolated compounds derived from H. velutina against A. aegypti fourth instar larvae. A crude ethanol extract was submitted to liquid–liquid extraction with hexane, dichloromethane, ethyl acetate and n-butanol to obtain their respective fractions. Larvicidal evaluations of the fractions were performed, and the hexane and dichloromethane fractions exhibited greater activities than the other fractions, with LC(50) (50% lethal concentration) values of 3.88 and 5.80 mg/mL, respectively. The phytochemical study of these fractions resulted in the isolation and identification of 17 compounds. The molecules were subjected to a virtual screening protocol, and five molecules presented potential larvicidal activity after analyses of their applicability domains. When molecular docking was analysed, only three of these compounds showed an ability to bind with sterol carrier protein-2 (1PZ4), a protein found in the larval intestine. The compounds tiliroside and 7,4′-di-O-methyl-8-O-sulphate flavone showed in vitro larvicidal activity, with LC(50) values of 0.275 mg/mL after 72 h and 0.182 mg/mL after 24 h of exposure, respectively. This is the first study to demonstrate the larvicidal activity of sulphated flavonoids against A. aegypti. Our results showed that the presence of the OSO(3)H group attached to C-8 of the flavonoid was crucial to the larvicidal activity. This research supports the traditional use of H. velutina as an alternative insecticide for the control of A. aegypti, which is a vector for severe arboviruses, such as dengue and chikungunya. MDPI 2019-06-22 /pmc/articles/PMC6631904/ /pubmed/31234501 http://dx.doi.org/10.3390/molecules24122315 Text en © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Fernandes, Diégina A.
Barros, Renata P. C.
Teles, Yanna C. F.
Oliveira, Louise H. G.
Lima, Jéssica B.
Scotti, Marcus T.
Nunes, Fabíola C.
Conceição, Adilva S.
Vanderlei de Souza, Maria de Fátima
Larvicidal Compounds Extracted from Helicteres velutina K. Schum (Sterculiaceae) Evaluated against Aedes aegypti L.
title Larvicidal Compounds Extracted from Helicteres velutina K. Schum (Sterculiaceae) Evaluated against Aedes aegypti L.
title_full Larvicidal Compounds Extracted from Helicteres velutina K. Schum (Sterculiaceae) Evaluated against Aedes aegypti L.
title_fullStr Larvicidal Compounds Extracted from Helicteres velutina K. Schum (Sterculiaceae) Evaluated against Aedes aegypti L.
title_full_unstemmed Larvicidal Compounds Extracted from Helicteres velutina K. Schum (Sterculiaceae) Evaluated against Aedes aegypti L.
title_short Larvicidal Compounds Extracted from Helicteres velutina K. Schum (Sterculiaceae) Evaluated against Aedes aegypti L.
title_sort larvicidal compounds extracted from helicteres velutina k. schum (sterculiaceae) evaluated against aedes aegypti l.
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6631904/
https://www.ncbi.nlm.nih.gov/pubmed/31234501
http://dx.doi.org/10.3390/molecules24122315
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