Ecotoxicity assessment of microcystins from freshwater samples using a bioluminescent cyanobacterial bioassay.

Ecotoxicity assessment of microcystins from freshwater samples using a bioluminescent cyanobacterial bioassay. Chemosphere. 2020 Feb;240:124966 Authors: González-Pleiter M, Cirés S, Wörmer L, Agha R, Pulido-Reyes G, Martín-Betancor K, Rico A, Leganés F, Quesada A, Fernández-Piñas F Abstract The hepatotoxic cyanotoxins microcystins (MCs) are emerging contaminants naturally produced by cyanobacteria. Yet their ecological role remains unsolved, previous research suggests that MCs have allelopathic effects on competing photosynthetic microorganisms, even eliciting toxic effects on other freshwater cyanobacteria. In this context, the bioluminescent recombinant cyanobacterium Anabaena sp. PCC7120 CPB4337 (hereinafter Anabaena) was exposed to extracts of MCs. These were obtained from eight natural samples from freshwater reservoirs that contained MCs with a concentration range of 0.04-11.9 μg MCs L-1. MCs extracts included the three most common MCs variants (MC-LR, MC-RR, MC-YR) in different proportions (MC-LR: 100-0%; MC-RR: 100-0%; MC-YR: 14.2-0%). The Anabaena bioassay based on bioluminescence inhibition has been successfully used to test the toxicity of many emerging contaminants (e.g., pharmaceuticals) but never for cyanotoxins prior to this study. Exposure of Anabaena to MCs extracts induced a decrease in its bioluminescence with effective concentration decreasing bioluminescence by 50% ranging from 0....
Source: Chemosphere - Category: Chemistry Authors: Tags: Chemosphere Source Type: research

Related Links:

Authors: Karimi G, Vard B, Riyahi R, Motlagh ME, Heshmat R, Kelishadi R Abstract This cross-sectional study was conducted among 14,400 Iranian students, aged 7-18 years to determine the association between the frequency of family dinner and mental health. Family dinner frequency, family relationship, life satisfaction (LS), self-perceived health and anxiety were assessed by validated questionnaires. Of 14,274 participants, 50.6% were boys and 71.4% were urban residents, with a mean (SD) age of 12.28 (3.16) years. Family dinner frequency was significantly correlated with LS (boys: β = 0.27, p 
Source: International Journal of Food Sciences and Nutrition - Category: Nutrition Tags: Int J Food Sci Nutr Source Type: research
In this study we explored the use of a natural compound rubusoside (RUB) as a solubilizer to enhance the solubility of a fluorescence-labeled C6-Ceramide (NBD C6-Ceramide) and to characterize its pharmacokinetics and tissue distribution in an animal model. RUB significantly enhanced the solubility of NBD C6-Ceramide by forming nanomicelles, and efficiently delivered NBD C6-Ceramide in rats by oral and intravenous administration. RUB loaded 1.96% of NBD C6-Ceramide in the nanomicelles and solubilized it to a concentration of 3.6 mg/mL in water. NBD C6-Ceramide in nanomicelles remained stable in aqueous solutions, all...
Source: Prostaglandins and Other Lipid Mediators - Category: Lipidology Source Type: research
Publication date: Available online 10 December 2019Source: Prostaglandins &Other Lipid MediatorsAuthor(s): Giorgio Mottola, Evan Werlin, Bian Wu, Mian Chen, Anuran Chatterjee, Melinda Schaller, Michael S. ConteAbstractInflammation ensuing from vascular injury promotes intimal hyperplasia (IH) and restenosis. Resolvin D1 (RvD1) is a lipid mediator that attenuates IH in vivo when delivered locally to the vessel wall in animal models. We tested the hypothesis that peri-procedural oral administration of RvD1 could blunt the local inflammatory response to angioplasty, and attenuate downstream IH. Carotid angioplasty was per...
Source: Prostaglandins and Other Lipid Mediators - Category: Lipidology Source Type: research
First-of-its-kind trial evaluates decision aid’s efficacy
Source: St. Michael's Hospital News and Media - Category: Hospital Management Tags: Hospital News Source Type: news
Authors: Glauser W PMID: 31818934 [PubMed - in process]
Source: Canadian Medical Association Journal - Category: General Medicine Tags: CMAJ Source Type: research
Authors: Owens B PMID: 31818933 [PubMed - in process]
Source: Canadian Medical Association Journal - Category: General Medicine Tags: CMAJ Source Type: research
Authors: Dermer M, Martel J, Greenhill A PMID: 31818932 [PubMed - in process]
Source: Canadian Medical Association Journal - Category: General Medicine Tags: CMAJ Source Type: research
Authors: Robson R PMID: 31818931 [PubMed - in process]
Source: Canadian Medical Association Journal - Category: General Medicine Tags: CMAJ Source Type: research
Authors: Lamb S PMID: 31818930 [PubMed - in process]
Source: Canadian Medical Association Journal - Category: General Medicine Tags: CMAJ Source Type: research
Authors: Zimmer V, Glanemann M, Lammert F PMID: 31818929 [PubMed - in process]
Source: Canadian Medical Association Journal - Category: General Medicine Tags: CMAJ Source Type: research
More News: Chemistry | Environmental Health | Study | Toxicology