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Ecdysteroid antagonistic activity

The plant-insect chemical interactions concerning the stilbenoids have just been reviewed [509] (-i-)-Ampelopsin B (806) and ct-viniferin (635) antagonized the action of 20-hydroxyecdysone [510] cw-miyabenol A (735), kobophenol B and cw-miyabenol C (663) showed competitive binding to ecdysteroid receptors [337] resveratrol (1) and oligomers (suffruticosols A-C, 589-591) also exhibited ecdysteroid antagonistic activity [297]. [Pg.605]

Ecdysteroids are the steroid hormones of insects, where they regulate moulding and metamorphosis. As ecdysteroids are essential to the normal development of insects, it was presumed that some plant secondary metabolites might have the ecdysteroid antagonistic activity and be capable of affecting insect development. Such compounds would be useful... [Pg.629]

Sarker SD, Whiting P, Dinan L (1999) Identification and ecdysteroid antagonist activity of three resveratrol trimers (suffruticosols A, B and C) from Paeonia suffruticosa. Tetrahedron 55 513-524... [Pg.1943]

The study of Savchenko et al. (2000) on solanaceous species described also ecdysteroid antagonist activity of solanaceous extracts. However, only weak activity was associated with a few of such extracts. Major withanolides were inactive, but they may be activated by metabolism after ingestion by invertebrate predators. [Pg.465]

As part of an extensive survey of natural products to detect those showing ecdysteroid agonist or antagonist activities in the Bn bioassay [170], it was found that the diterpene maocrystal E (8-8) showed agonist activity (EC50 = 5 x 10 6M). [Pg.24]

We conclude that brassinosteroids may have a slight (if any) agonistic activity in a bioassay for ecdysteroids More importantly, they reveal a significant antagonistic activity. This antagonistic effect is dose dependent and reversible. [Pg.272]

Dinan L. reported that three resveratrol trimers, suffruticosols A (100), B (101), C (102), and one monomer cis resveratrol from Paeonia suffruticosa are active as ecdysteroids (antagonists (EDso) 10-50 pM vs. 5xlO 8pM of 20-hydroxyecdyson), but inactive as agonists in the Drosophila melanogaster BII cell bioassay for ecdysteroids agonists/ antagonists [75]. [Pg.630]

See other pages where Ecdysteroid antagonistic activity is mentioned: [Pg.605]    [Pg.460]    [Pg.605]    [Pg.605]    [Pg.460]    [Pg.605]    [Pg.33]    [Pg.41]    [Pg.52]    [Pg.53]    [Pg.59]    [Pg.33]    [Pg.41]    [Pg.52]    [Pg.53]    [Pg.59]    [Pg.265]    [Pg.272]    [Pg.431]    [Pg.457]    [Pg.1045]    [Pg.1046]    [Pg.516]    [Pg.16]    [Pg.43]    [Pg.43]    [Pg.909]    [Pg.2740]   
See also in sourсe #XX -- [ Pg.610 ]



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