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Characterization of microalgae and associated bacteria collected from shellfish harvesting areas

机译：从贝类收获地区收集的微藻及相关细菌的表征

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摘要

Marine algal toxins are an important cause of seafood-associated outbreaks. Some marine bacteria living in association with algae are able to produce channel-blocking substances similar to PSP and TTX toxins and a role of these bacteria in the toxicity of dinoflagellates has been hypothesized. The aim of this study was to monitor, over a period of 2 years, areas used in shellfish production in the northern Adriatic Sea, through the determination of phytoplankton and the characterization of bacteria isolated from algae. Toxicity tests on bacterial extracts were performed using in vivo (mouse) and in vitro (cell culture) tests and by HPLC. The Dinophysis genus was detected throughout the year, while the Alexandrium genus was present in winter and spring. Sixteen bacteria isolated from algae, out of 61 bacterial strains tested by in vitro assay, were found to be producers of toxic substances that could block sodium channels in cells. HPLC analysis for the detection of PSP and TTX toxins always gave negative results, but their presence in concentrations undetectable by HPLC, and/or the production of chemically different substances with similar biological action, could not be excluded.
机译：海洋藻毒素是与海鲜有关的暴发的重要原因。一些与藻类生活在一起的海洋细菌能够产生与PSP和TTX毒素相似的通道阻断物质，并且已经假设这些细菌在鞭毛藻毒性中的作用。这项研究的目的是通过确定浮游植物和鉴定从藻类中分离出来的细菌，在两年的时间内监测亚得里亚海北部贝类生产中使用的区域。使用体内（小鼠）和体外（细胞培养）测试以及通过HPLC对细菌提取物进行毒性测试。全年检测到恐龙属，而冬季和春季则存在亚历山大属。在通过体外测定法测试的61种细菌菌株中，从藻类中分离出的16种细菌被发现是有毒物质的生产者，这些物质可能会阻塞细胞中的钠通道。用于检测PSP和TTX毒素的HPLC分析始终给出阴性结果，但是不能排除它们以HPLC无法检测到的浓度和/或具有相似生物学作用的化学上不同的物质的产生。

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