Vanadium induces VL30 retrotransposition at an unusually high level: a possible carcinogenesis mechanism
Φόρτωση...
Ημερομηνία
Συγγραφείς
Noutsopoulos, D.
Markopoulos, G.
Koliou, M.
Dova, L.
Vartholomatos, G.
Kolettas, E.
Tzavaras, T.
Τίτλος Εφημερίδας
Περιοδικό ISSN
Τίτλος τόμου
Εκδότης
Περίληψη
Τύπος
Είδος δημοσίευσης σε συνέδριο
Είδος περιοδικού
peer-reviewed
Είδος εκπαιδευτικού υλικού
Όνομα συνεδρίου
Όνομα περιοδικού
J Mol Biol
Όνομα βιβλίου
Σειρά βιβλίου
Έκδοση βιβλίου
Συμπληρωματικός/δευτερεύων τίτλος
Περιγραφή
Carcinogenesis by vanadium is thought to occur through induction of DNA-double-strand breaks (DSBs) but its mechanism is not fully understood. We investigated the effect of vanadium on induction of viral-like 30 element (VL30) retrotransposition using a NIH3T3 cell-retrotransposition assay based on a recombinant VL30/EGFP element. Incubation of assay cells with vanadyl sulphate (VOSO(4)) induced retrotransposition frequency in a dose and time-dependent manner, measured by fluorescence-activated cell scanning (FACS) and retrotransposition events were confirmed by UV microscopy and PCR analysis. Among vanadium salts with different valence tested, vanadyl (4+) ions were the most potent retrotransposition inducers. VOSO(4), at 50 muM induced retrotranspositions at an unusually high frequency of up to 0.185 events per cell per generation. VOSO(4), acting at the transcription level, strongly induced VL30 and endogenous reverse transcriptase (enRT) transcripts with maxima at 50 muM and 100 muM of 22 and 18-fold, respectively. VOSO(4)-induced retrotransposition frequency was inhibited by 42% with efavirenz, an inhibitor of enRTs, while paraquat, a DNA-DSBs inducer, had no effect. Furthermore, it was completely abolished with deferoxamine, a metal chelator, while reduced by 75% with N-acetyl-cysteine, a general antioxidant. Remarkably, H(2)O(2) reproduced inducible retrotransposition linking for the first time oxidative stress to induction of retrotransposition. We propose that VOSO(4)-induced VL30 retrotransposition through H(2)O(2) generation may be an alternative mutagenic, DNA-DSBs independent, mechanism leading to carcinogenesis.
Περιγραφή
Λέξεις-κλειδιά
Animals, Blotting, Northern, Blotting, Western, Cell Line, Transformed, *Cell Transformation, Viral, Comet Assay, Genome, Viral, Green Fluorescent Proteins/genetics/metabolism, Humans, Hydrogen Peroxide/pharmacology, Mice, NIH 3T3 Cells, Oxidative Stress, Plasmids, Polymerase Chain Reaction, RNA-Directed DNA Polymerase/genetics, Retroelements/genetics/*physiology, Simian virus 40/*physiology, Trace Elements/*pharmacology, Transfection, *Up-Regulation, Vanadium/*pharmacology
Θεματική κατηγορία
Παραπομπή
Σύνδεσμος
http://www.ncbi.nlm.nih.gov/pubmed/17920077
http://ac.els-cdn.com/S0022283607011862/1-s2.0-S0022283607011862-main.pdf?_tid=b7542fb649b3e3506e67817d19bbc204&acdnat=1333007275_c50b07b2e667b2f6ddd857f2eb0d4111
http://ac.els-cdn.com/S0022283607011862/1-s2.0-S0022283607011862-main.pdf?_tid=b7542fb649b3e3506e67817d19bbc204&acdnat=1333007275_c50b07b2e667b2f6ddd857f2eb0d4111
Γλώσσα
en
Εκδίδον τμήμα/τομέας
Όνομα επιβλέποντος
Εξεταστική επιτροπή
Γενική Περιγραφή / Σχόλια
Ίδρυμα και Σχολή/Τμήμα του υποβάλλοντος
Πανεπιστήμιο Ιωαννίνων. Σχολή Επιστημών Υγείας. Τμήμα Ιατρικής