Abstract:
:Membrane lipid peroxidation is known to produce various aldehydic compounds which cause a wide range of biological effects including heart disease, aging, and cancer. To investigate the effect of lipid peroxidation products on the expression of glutathione S-transferases (GSTs), which catalyze the conjugation of reactive chemicals with glutathione and play an important role in protecting cells, normal rat liver epithelial cells (RL34) were exposed to a variety of aldehydic compounds. We found that the GST activity in RL34 cells was induced by alpha,beta-unsaturated aldehydes, such as acrolein (1.3-fold), crotonaldehyde (1.3-fold), 4-hydroxy-2-hexenal (HHE) (1.4-fold), and 4-hydroxy-2-nonenal (HNE) (1.7-fold). The induction of GST activity by HNE was time-dependent, reaching a plateau after 16 h. The immunoblot analysis using the polyclonal antibodies against GST isozymes demonstrated that GST-P (pi-class), a well-known tumor marker, was significantly induced 16 h after the HNE treatment. Also, immunostaining for the presence of GST-P confirmed the enhanced expression of GST-P in the cytoplasm of the cells. Northern blot analysis revealed that the HNE treatment of RL34 cells for 1 h enhanced the expression of GST-P mRNA, which returned to the control level after 16 h. These data suggest that the induction of GST-P by HNE may represent an important cellular defense mechanism against oxidative injury.
journal_name
Biochem Biophys Res Communjournal_title
Biochemical and biophysical research communicationsauthors
Fukuda A,Nakamura Y,Ohigashi H,Osawa T,Uchida Kdoi
10.1006/bbrc.1997.6585subject
Has Abstractpub_date
1997-07-18 00:00:00pages
505-9issue
2eissn
0006-291Xissn
1090-2104pii
S0006-291X(97)96585-2journal_volume
236pub_type
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