Abstract:
:Carbon monoxide (CO) and nitric oxide (NO) are two gas molecules which have cytoprotective functions against oxidative stress and inflammatory responses in many cell types. Currently, it is known that NO produced by nitric oxide synthase (NOS) induces heme oxygenase 1 (HO1) expression and CO produced by the HO1 inhibits inducible NOS expression. Here, we first show CO-mediated HO1 induction and its possible mechanism in human hepatocytes. Exposure of HepG2 cells or primary hepatocytes to CO resulted in dramatic induction of HO1 in dose- and time-dependent manner. The CO-mediated HO1 induction was abolished by MAP kinase inhibitors (MAPKs) but not affected by inhibitors of PI3 kinase or NF-kappaB. In addition, CO induced the nuclear translocation and accumulation of Nrf2, which suppressed by MAPKs inhibitors. Taken together, we suggest that CO induces Nrf2 activation via MAPKs signaling pathways, thereby resulting in HO1 expression in HepG2 cells.
journal_name
Biochem Biophys Res Communjournal_title
Biochemical and biophysical research communicationsauthors
Lee BS,Heo J,Kim YM,Shim SM,Pae HO,Kim YM,Chung HTdoi
10.1016/j.bbrc.2006.03.058subject
Has Abstractpub_date
2006-05-12 00:00:00pages
965-72issue
3eissn
0006-291Xissn
1090-2104pii
S0006-291X(06)00552-3journal_volume
343pub_type
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