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Título

Structural diversity and defensive properties of norditerpenoid alkaloids

AutorGonzález-Coloma, Azucena ; Reina, Matías ; Medinaveitia, Alberto; Guadaño, Ana; Santana, Omar; Martínez Díaz, Rafael; Ruiz-Mesía, Lastenia; Alva, Allenger; Grandez, Maritza; Díaz, Rafael; Gavín, José A.; Fuente, Gabriel de la
Palabras claveAconitum
Consolida
Delphinium
Norditerpene alkaloids
Insecticidal
Cytotoxic structure–activity relationships
Fecha de publicaciónjul-2004
EditorSpringer
CitaciónJournal of Chemical Ecology 30(7): 1393-1408 (2004)
ResumenWe 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) (EC50 <1 μg/cm2). 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) (EC50 <3 μg/cm2). 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.
Descripción16 pages, 4 figures, 1 table.-- PMID: 15503527 [PubMed].
Versión del editorhttp://dx.doi.org/10.1023/B:JOEC.0000037747.74665.0a
URIhttp://hdl.handle.net/10261/14320
DOI10.1023/B:JOEC.0000037747.74665.0a
ISSN0098-0331 (Print)
1573-1561 (Online)
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