期刊
MARINE DRUGS
卷 10, 期 10, 页码 2322-2336出版社
MDPI
DOI: 10.3390/md10102322
关键词
cyanobacteria; Aphanizomenon ovalisporum; toxins; zebrafish (Danio rerio) embryo; polymethoxy-1-alkenes; vertebrate development; harmful algal blooms (HABs)
资金
- National Institute of Environmental Health Sciences (NIEHS) of the National Institutes of Health (NIH) [ES11181, ES014 037]
- Oceans and Human Health Initiative grant from National Oceanic and Atmospheric Administration [NA09NOS4730071]
Cyanobacteria are recognized producers of a wide array of toxic or otherwise bioactive secondary metabolites. The present study utilized the zebrafish (Danio rerio) embryo as an aquatic animal model of vertebrate development to identify, purify and characterize lipophilic inhibitors of development (i.e., developmental toxins) from an isolate of the freshwater cyanobacterial species, Aphanizomenon ovalisporum. Bioassay-guided fractionation led to the purification, and subsequent chemical characterization, of an apparent homologous series of isotactic polymethoxy-1-alkenes (1-6), including three congeners (4-6) previously identified from the strain, and two variants previously identified from other species (2 and 3), as well as one apparently novel member of the series (1). Five of the PMAs in the series (1-5) were purified in sufficient quantity for comparative toxicological characterization, and toxicity in the zebrafish embryo model was found to generally correlate with relative chain length and/or methoxylation. Moreover, exposure of embryos to a combination of variants indicates an apparent synergistic interaction between the congeners. Although PMAs have been identified previously in cyanobacteria, this is the first report of their apparent toxicity. These results, along with the previously reported presence of the PMAs from several cyanobacterial species, suggest a possibly widespread distribution of the PMAs as toxic secondary metabolites and warrants further chemical and toxicological investigation.
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