title: Assessment of natural products in the Drosophila melanogaster B(II) cell bioassay for ecdysteroid agonist and antagonist activities.
abstract: Ecdysteroid agonist and antagonist activities can be detected and quantified with the Drosophila melanogaster B(II) cell bioassay. This bioassay is convenient, sensitive and robust. We report the assessment with this bioassay of the activities of a wide range of compounds representing a number of classes of natural products. Many compounds were inactive over a wide concentration range (10(-8) to 10(-4) or 10(-3) M) or cytotoxic at high concentrations. However, antagonisitic activity was associated with several classes of compounds: cucurbitacins and withanolides (extending previous findings) and phenylalkanoids and certain alkaloids (described for the first time). A withanolide (withaperuvin D) is identified which possesses agonistic activity. Brassinosteroids, which have been ascribed (ant)agonistic properties in the past, were not found to be active in the B(II) bioassay, either as agonists or antagonists. Possible reasons for the prevalence of antagonists and for the low potency of the majority of them are discussed.
authors: Department of Biological Sciences, University of Exeter, Devon, UK. l.n.dinan@exeter.ac.uk
authors: L
authors: L
authors: Dinan
authors: P C
authors: PC
authors: Bourne
authors: Y
authors: Y
authors: Meng
authors: S D
authors: SD
authors: Sarker
authors: R B
authors: RB
authors: Tolentino
authors: P
authors: P
authors: Whiting
mesh_terms: D000470:Alkaloids / Q000737:chemistry / Q000494:pharmacology; D000818:Animals; D001667:Binding, Competitive; D001681:Biological Assay / Q000379:methods*; D001688:Biological Products / Q000737:chemistry / Q000378:metabolism / Q000494:pharmacology*; D002018:Bufanolides / Q000737:chemistry / Q000494:pharmacology; D002298:Cardenolides / Q000737:chemistry / Q000494:pharmacology; D002460:Cell Line; D054728:Cucurbitacins; D004331:Drosophila melanogaster / Q000166:cytology; D026461:Ecdysteroids; D004968:Estrogens, Non-Steroidal / Q000737:chemistry / Q000494:pharmacology; D007301:Insect Hormones / Q000737:chemistry / Q000494:pharmacology; D007529:Isoflavones; D008024:Ligands; D017705:Lignans / Q000737:chemistry / Q000494:pharmacology; D018377:Neurotransmitter Agents / Q000737:chemistry / Q000494:pharmacology; D048789:Phytoestrogens; D028321:Plant Preparations; D011987:Receptors, Steroid / Q000187:drug effects / Q000378:metabolism; D012503:Saponins / Q000737:chemistry / Q000494:pharmacology; D013256:Steroids / Q000819:agonists* / Q000037:antagonists & inhibitors* / Q000737:chemistry / Q000494:pharmacology; D014315:Triterpenes / Q000737:chemistry / Q000494:pharmacology
chemical_list: D000470:Alkaloids; D001688:Biological Products; D002018:Bufanolides; D002298:Cardenolides; D026461:Ecdysteroids; D004968:Estrogens, Non-Steroidal; D007301:Insect Hormones; D007529:Isoflavones; D008024:Ligands; D017705:Lignans; D018377:Neurotransmitter Agents; D048789:Phytoestrogens; D028321:Plant Preparations; D011987:Receptors, Steroid; D012503:Saponins; D013256:Steroids; D014315:Triterpenes; C034808:ecdysteroid receptor; D054728:Cucurbitacins