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Toxins 2016, 8(7), 219; doi:10.3390/toxins8070219

Anti-Inflammatory Activity of Cyanobacterial Serine Protease Inhibitors Aeruginosin 828A and Cyanopeptolin 1020 in Human Hepatoma Cell Line Huh7 and Effects in Zebrafish (Danio rerio)

1
School of Life Sciences, University of Applied Sciences and Arts Northwestern Switzerland (FHNW), Gründenstrasse 40, CH-4132 Muttenz, Switzerland
2
Department of Environmental Systems Science, Institute of Biogeochemistry and Pollution Dynamics, Swiss Federal Institute of Technology (ETHZ), CH-8092 Zürich, Switzerland
*
Author to whom correspondence should be addressed.
Academic Editor: Luis M. Botana
Received: 20 May 2016 / Revised: 21 June 2016 / Accepted: 5 July 2016 / Published: 14 July 2016
(This article belongs to the Collection Marine and Freshwater Toxins)
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Abstract

Intensive growth of cyanobacteria in freshwater promoted by eutrophication can lead to release of toxic secondary metabolites that may harm aquatic organisms and humans. The serine protease inhibitor aeruginosin 828A was isolated from a microcystin-deficient Planktothrix strain. We assessed potential molecular effects of aeruginosin 828A in comparison to another cyanobacterial serine protease inhibitor, cyanopeptolin 1020, in human hepatoma cell line Huh7, in zebrafish embryos and liver organ cultures. Aeruginosin 828A and cyanopeptolin 1020 promoted anti-inflammatory activity, as indicated by transcriptional down-regulation of interleukin 8 and tumor necrosis factor α in stimulated cells at concentrations of 50 and 100 µmol·L−1 aeruginosin 828A, and 100 µmol·L−1 cyanopeptolin 1020. Aeruginosin 828A induced the expression of CYP1A in Huh7 cells but did not affect enzyme activity. Furthermore, hatched zebrafish embryos and zebrafish liver organ cultures were exposed to aeruginosin 828A. The transcriptional responses were compared to those of cyanopeptolin 1020 and microcystin-LR. Aeruginosin 828A had only minimal effects on endoplasmic reticulum stress. In comparison to cyanopeptolin 1020 our data indicate that transcriptional effects of aeruginosin 828A in zebrafish are very minor. The data further demonstrate that pathways that are influenced by microcystin-LR are not affected by aeruginosin 828A. View Full-Text
Keywords: aeruginosin; cyanopeptolin; microcystin; anti-inflammatory; human hepatoma cells; zebrafish; transcription analysis; cytochrome P450 aeruginosin; cyanopeptolin; microcystin; anti-inflammatory; human hepatoma cells; zebrafish; transcription analysis; cytochrome P450
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MDPI and ACS Style

Faltermann, S.; Hutter, S.; Christen, V.; Hettich, T.; Fent, K. Anti-Inflammatory Activity of Cyanobacterial Serine Protease Inhibitors Aeruginosin 828A and Cyanopeptolin 1020 in Human Hepatoma Cell Line Huh7 and Effects in Zebrafish (Danio rerio). Toxins 2016, 8, 219.

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