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Antipredatory secosterols from the octocoral Pseudopterogorgia americana

机译：来自美国八角假单胞菌的抗掠食性甾醇

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摘要

The chemical defense of the Caribbean octocoral Pseudopterogorgia americana was investigated using feeding assays performed in aquaria and in situ with a natural assemblage of predatory fishes. Using a bioassay-guided scheme, crude extracts, fractions and pure compounds were incorporated into palatable foods and tested. Only the secosterol fraction deterred fish feeding. Two secosterols were identified from the bioactive fraction by spectroscopic methods and comparison with literature data: 9,11-secogorgosterol (Compound 1) and 9,11-secodinosterol (Compound 2), both of which have been previously described from Pseudopterogorgia spp. Our results suggest that symbiont-produced gorgosterol and dinosterol are oxidized by the coral host to C-ring secosterols, which then provide a chemical defense to both coral and alga.
机译：使用在水族馆和就地捕食性鱼类的自然组合进行的摄食试验研究了加勒比八角形拟南芥的化学防御作用。使用生物测定指导方案，将粗提取物，馏分和纯化合物掺入可口食品中并进行测试。只有secosterol分数阻止了鱼的饲养。通过光谱方法从生物活性级分中鉴定出两种仲甾醇，并与文献数据进行比较：9,11-secogorgosterol（化合物1）和9,11-secodinosterol（化合物2），这两种都是先前从Pseudopterogorgia spp中描述的。我们的研究结果表明，共生体产生的长春甾醇和恐龙甾醇被珊瑚宿主氧化为C环仲甾醇，进而为珊瑚和藻类提供了化学防御作用。

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