Structural diversity and defensive properties of norditerpenoid alkaloids

Azucena González-Coloma, Matías Reina, Alberto Medinaveitia, Ana Guadaño, Omar Santana, Rafael Martínez-Díaz, Lastenia Ruiz-Mesía, Allenger Alva, Maritza Grandez, Rafael Díaz, José A. Gavín, Gabriel De La Fuente

Producción científica: Contribución a una revistaArtículorevisión exhaustiva

41 Citas (Scopus)

Resumen

We have tested the insect antifeedant and toxic activity of 43 norditerpenoid alkaloids on Spodoptera littoralis and Leptinotarsa decemlineata including eserine (physostigmine), anabasine, and atropine. Antifeedant effects of the test compounds were structure- and species-dependent. The most active antifeedants to L. decemlineata were 1,14-diacetylcardiopetaline (9) and 18-hydroxy-14-O-methylgadesine (33), followed by 8-O-methylconsolarine (12), 14-O-acetyldelectinine (27), karakoline (7), cardiopetaline (8), 18-O-demethylpubescenine (13), 14-O-acetyldeltatsine (18), takaosamine (21), ajadine (24), and 8-O-methylcolumbianine (6) (EC 50 <1 μg/cm 2). This insect showed a moderate response to atropine. S. littoralis had the strongest antifeedant response to 24, 18, 14-O-acetyldelcosine (19), and delphatine (29) (EC 50 <3 μg/cm 2). None of the model substances affected the feeding behavior of this insect. The most toxic compound to L. decemlineata was aconitine (1), followed by cardiopetalidine (10) (% mortality >60), 14-deacetylpubescenine (14), 18-O-benzoyl-18-O-demethyl-14-O-deacetylpubescenine (17), 14-O- acetyldelcosine (19), 14-deacetylajadine (25) and methyllycaconitine (30) (% mortality >45). Orally injected S. littoralis larvae were negatively affected by 1, cardiopetaline (8), 10, 1,14-O-acetylcardiopetalidina (11), 12, 14, 1,18-O-diacetyl-19-oxo-gigactonine (41), olivimine (43), and eserine in varying degrees. Their antifeedant or insecticidal potencies did not parallel their reported nAChR binding activity, but did correlate with the agonist/antagonist insecticidal/antifeedant model proposed for nicotininc insecticides. A few compounds [14, tuguaconitine (38), 14-demethyldelboxine (40), 19, dehydrodelsoline (36), 18-O-demethylpubescenine (13), 41, 9, and delcosine (23)] had selective cytotoxic effects to ward insect-derived Sf9 cells. None were cytotoxic to mammalian CHO cells and none increased Trypanosoma cruzi mortality. The selective cytotoxic effects of some structures indicate that they can act on biological targets other than neuroreceptors.

Idioma originalInglés
Páginas (desde-hasta)1393-1408
Número de páginas16
PublicaciónJournal of Chemical Ecology
Volumen30
N.º7
DOI
EstadoPublicada - jul. 2004
Publicado de forma externa

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