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Major differences among chemopreventive organoselenocompounds in the sustained elevation of cytoprotective genes
Author(s) -
Poerschke Robyn L.,
Franklin Michael R.,
Bild Andrea H.,
Moos Philip J.
Publication year - 2012
Publication title -
journal of biochemical and molecular toxicology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.526
H-Index - 58
eISSN - 1099-0461
pISSN - 1095-6670
DOI - 10.1002/jbt.21427
Subject(s) - glutathione , reactive oxygen species , chemistry , thioredoxin , nad+ kinase , thioredoxin reductase , oxidative stress , glutathione reductase , biochemistry , antioxidant , microbiology and biotechnology , enzyme , biology , glutathione peroxidase
Cytoprotective enzyme elevation through the nuclear erythroid 2 p45‐related factor 2 (Nrf2)–Kelch‐like ECH‐associated protein 1/antioxidant response element pathway has been promulgated for cancer prevention. This study compares the redox insult and sustained cytoprotective enzyme elevation by organoselenocompounds and sulforaphane (SF) in lung cells. SF elicited a rise in reactive oxygen species (ROS) and drop in glutathione (GSH) at 2 h; nuclear accumulation of Nrf2 at 4 h; and a GSH rebound and elevation in NAD(P)H quinone oxidoreductase (NQO1), thioredoxin reductase (TR1), and glutamate–cysteine ligase (GCL) at 24 h. Selenocystine (SECY) elicited a similar 24 h response, despite lesser earlier time‐point changes. 2‐Cyclohexylselenazolidine‐4‐carboxylic acid effects were similar to SECY's but with a larger Nrf2 change and the largest 24 h increase in GSH, GCL, TR1, and NQO1 of any compound investigated. Selenomethionine elicited a similar acute rise in ROS, but lesser depletion of GSH, no 4 h increase in nuclear Nrf2, only minor 24 h elevations in TR1 and NQO1, and a GCL elevation insufficient to elevate GSH. © 2012 Wiley Periodicals, Inc. J Biochem Mol Toxicol 26:344–353, 2012; View this article online at wileyonlinelibrary.com . DOI 10.1002/jbt.21417