Abstract
TNFα and IL-1 each can activate NF-κB and induce gene expression of manganese superoxide dismutase (MnSOD), a mitochondrial matrix enzyme which can provide critical protection against hyperoxic lung injury. The regulation of MnSOD gene expression is not well understood. Since redox status can modulate NF-κB and potential κB site(s) exist in the MnSOD promoter, the effect of thiols (including NAC, DTT and 2-ME) on TNFα and IL-1 induced activation of NF-κB and MnSOD gene expression was investigated. Activation of NF-kB and increased MnSOD expression were potentiated by thiol reducing agents. In contrast, thiol oxidizing or alkylating agents inhibited both NF-κB activation and elevated MnSOD expression in response to TNFα or IL-1. Since protease inhibitors TPCK and TLCK can inhibit NF-κB activation, we also investigated the effect of these compounds on MnSOD expression and NF-κB activation. TPCK and TLCK each inhibited MnSOD gene expression and NF-κB activation. Since the MnSOD promoter also contains anAP-1 binding site, the effect of thiols and thiol modifying agents on AP-1 activation was investigated. Thiols had no consistent effect onAP-1 activation. Likewise, some of the thiol modifying compounds inhibited AP-1 activation by TNFα or IL-1, whereas others did not. Since diverse agents had similar effects on activation of NF-κB and MnSOD gene expression, we have demonstrated that activation of NF-κB and MnSOD gene expression are closely associated and that reduced sulfhydryl groups are required for cytokine mediation of both processes.
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Abbreviations
- O2 :
-
Superoxide radical
- H2O2 :
-
Hydrogen peroxide
- NAC:
-
N-acetyl L-cysteine
- DTT:
-
Dithiothreitol
- 2-ME:
-
2-Mercaptoethanol
- MnSOD:
-
Manganese superoxide dismutase
- NF-κB:
-
Nuclear factor kappa B
- AP-1:
-
Activator protein-1
- NBT:
-
Nitroblue tetrazolium
- CAT:
-
Chloramphenicol acetyltransferase
- TPCK:
-
N-tosyl-L-phenylalanine chloromethyl ketone
- TLCK:
-
Na-p-tosyl-L-lysine chloromethyl ketone
- TAME:
-
N-α-p-tosyl-L-arginine methyl ester
- NEM:
-
N-ethyl maleimide
- DEM:
-
Diethyl maleate
- CDNB:
-
1-chloro-2,4-dinitrobenzene
- DTTOX :
-
Oxidized dithiothreitol
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Das, K.C., Lewis-Molock, Y. & White, C.W. Thiol modulation of TNFα and IL-1 induced MnSOD gene expression and activation of NF-κB. Mol Cell Biochem 148, 45–57 (1995). https://doi.org/10.1007/BF00929502
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DOI: https://doi.org/10.1007/BF00929502