Cylindrospermopsin induced transcriptional responses in human hepatoma HepG2 cells.

Abstract

The newly emerging cyanotoxin cylindrospermopsin (CYN) is showing genotoxic effects in a range of test systems. However, the knowledge on the mechanisms involved is limited. To get insight into the cellular responses to CYN a toxicogenomic analysis of selected genes commonly affected by genotoxic stress was performed on HepG2 cells exposed to a non-cytotoxic but genotoxic concentration of CYN (0.5 μg/ml for 12 and 24h). CYN increased expression of the immediate-early response genes from the FOS and JUN gene families and there was strong evidence for the involvement of P53 and NF-κB signaling. Strong up-regulation of the growth arrest and DNA damage inducible genes (GADD45A and GADD45B), cyclin-dependent kinase inhibitors (CDKN1A and CDKN2B), checkpoint kinase 1 (CHEK1), and genes involved in DNA damage repair (XPC, ERCC4 and others) indicated cell-cycle arrest and induction of nucleotide excision and double strand break repair. Up-regulation of metabolic enzyme genes provided evidence for the involvement of phase I (CYP1A1, CYP1B1, ALDH1A2 and CES2) and phase II (UGT1A6, UGT1A1, NAT1 and GSTM3) enzymes in the detoxification response and potential activation of CYN. The obtained transcriptional patterns after exposure of HepG2 cells to CYN provide valuable new information on the cellular response to CYN.

• Authors: Alja Straser, Metka Filipič, Bojana Zegura
• Journal: Toxicology in vitro : an international journal published in association with BIBRA (Toxicol In Vitro) Vol. 27 Issue 6 Pg. 1809-19 (Sep 2013) ISSN: 1879-3177 [Electronic] England
• PMID: 23726867 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
• Copyright: Copyright © 2013 Elsevier Ltd. All rights reserved.

Chemical References

• Alkaloids
• Bacterial Toxins
• Cyanobacteria Toxins
• Marine Toxins
• Microcystins
• cylindrospermopsin
• Uracil

Topics

• Alkaloids
• Apoptosis
• Bacterial Toxins (toxicity)
• Cell Cycle
• Cell Proliferation
• Cell Survival
• Cyanobacteria Toxins
• DNA Damage
• Gene Expression Profiling
• Gene Expression Regulation (drug effects)
• Hep G2 Cells
• Humans
• Marine Toxins (toxicity)
• Microcystins (toxicity)
• Transcription, Genetic (drug effects)
• Uracil (analogs & derivatives, toxicity)