IMIS | Flanders Marine Institute

Flanders Marine Institute

Platform for marine research


Publications | Institutes | Persons | Datasets | Projects | Maps
[ report an error in this record ]basket (0): add | show Printer-friendly version

Toxin release in response to oxidative stress and programmed cell death in the cyanobacterium Microcystis aeruginosa
Ross, C.; Santiago-Vázquez, L.; Paul, V. (2006). Toxin release in response to oxidative stress and programmed cell death in the cyanobacterium Microcystis aeruginosa. Aquat. Toxicol. 78(1): 66-73.
In: Aquatic Toxicology. Elsevier Science: Tokyo; New York; London; Amsterdam. ISSN 0166-445X, more
Peer reviewed article  

Available in  Authors 

    Microcystis aeruginosa (Kützing) Kützing, 1846 [WoRMS]; USA, Florida [Marine Regions]; Marine
Author keywords
    caspase; cellular stress; hydrogen peroxide; Microcystis aeruginosa;microcystins; programmed cell death

Authors  Top 
  • Ross, C.
  • Santiago-Vázquez, L.
  • Paul, V.

    An unprecedented bloom of the cyanobacterium Microcystis aeruginosa Kütz. occurred in the St. Lucie Estuary, FL in the summer of 2005. Samples were analyzed for toxicity by ELISA and by use of the polymerase chain reaction (PCR) with specific oligonucleotide primers for the mcyB gene that has previously been correlated with the biosynthesis of toxic microcystins. Despite the fact that secreted toxin levels were relatively low in dense natural assemblages (3.5 μg l−1), detectable toxin levels increased by 90% when M. aeruginosa was stressed by an increase in salinity, physical injury, application of the chemical herbicide paraquat, or UV irradiation. The application of the same stressors caused a three-fold increase in the production of H2O2 when compared to non-stressed cells. The application of micromolar concentrations of H2O2 induced programmed cell death (PCD) as measured by a caspase protease assay. Catalase was capable of inhibiting PCD, implicating H2O2 as the inducing oxidative species. Our results indicate that physical stressors induce oxidative stress, which results in PCD and a concomitant release of toxin into the surrounding media. Remediation strategies that induce cellular stress should be approached with caution since these protocols are capable of releasing elevated levels of microcystins into the environment.

All data in IMIS is subject to the VLIZ privacy policy Top | Authors