Abstract:
:When human ovarian carcinoma cells are challenged with endotoxin, an I kappa B kinase is transiently induced within 3 to 5 min. This enzyme activity causes the hyperphosphorylation and subsequent degradation of I kappa B which allows NF-kappa B to translocate to the nucleus where it activates transcription. When endotoxin treated cells are rechallenged with a second dose of LPS, I kappa B kinase is not detected and I kappa B remains in the cytoplasm where it sequesters NF-kappa B. We report here the absence of endotoxin inducible I kappa B kinase activity in endotoxin tolerant cells suggesting that I kappa B kinase may play an important role in endotoxin tolerance. When cells tolerant to endotoxin are treated with TNF, I kappa B kinase activity is induced. Thus cells that are endotoxin tolerant are not cross tolerant to TNF. Dexamethasone, a known inhibitor of NF-kappa B activation does not inhibit endotoxin dependent induction of I kappa B kinase suggesting that the mechanism of action of dexamethasone is different from the tolerance mechanism reported here.
journal_name
Biochem Biophys Res Communjournal_title
Biochemical and biophysical research communicationsauthors
Kohler NG,Joly Adoi
10.1006/bbrc.1997.6337subject
Has Abstractpub_date
1997-03-27 00:00:00pages
602-7issue
3eissn
0006-291Xissn
1090-2104pii
S0006-291X(97)96337-3journal_volume
232pub_type
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journal_title:Biochemical and biophysical research communications
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journal_title:Biochemical and biophysical research communications
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journal_title:Biochemical and biophysical research communications
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journal_title:Biochemical and biophysical research communications
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journal_title:Biochemical and biophysical research communications
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journal_title:Biochemical and biophysical research communications
pub_type: 杂志文章
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journal_title:Biochemical and biophysical research communications
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journal_title:Biochemical and biophysical research communications
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journal_title:Biochemical and biophysical research communications
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journal_title:Biochemical and biophysical research communications
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journal_title:Biochemical and biophysical research communications
pub_type: 杂志文章
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journal_title:Biochemical and biophysical research communications
pub_type: 杂志文章
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journal_title:Biochemical and biophysical research communications
pub_type: 杂志文章
doi:10.1016/s0006-291x(89)80144-5
更新日期:1989-05-15 00:00:00