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LPS tolerance in monocytes/macrophages: three 3' cytosins are required in the DNA binding motif for detection of upregulated NF-kappa B p50 homodimers.

Abstract：

:When monocytes are stimulated with LPS (lipopolysaccharide) repeatedly then the initially high expression of the TNF (tumor necrosis factor) gene is only very low, i.e. the cells are tolerant to LPS. Tolerant cells still express the CD14 receptor and they can still be activated to mobilize NF-kappa B into nucleus. Analysis of the binding proteins employing the -605 motif of the human TNF promoter (GGGGCTGTCCC) revealed that in tolerant cells of the human monocytic cell line Mono Mac 6 there is a predominance of p50p50 of NF-kappa B. We now show that a mutant motif that exchanges the terminal 3' C for a G fails to bind the p50 homodimer that is upregulated in LPS toler ant human Mono Mac 6 cells. The same is true for nuclear extracts taken from the murine P388D1 macrophage cell line when tested with the -516 motif of the murine TNF promoter (GGGGGCTTTCCC). Here the wild type motif gives efficient binding of p50p50 that again is upregulated in tolerant cells whereas a mutant with a 3' G shows hardly any binding of p50p50. Conversely, the murine kappa light chain enhancer motif (GGGGACTTTCCG) does not efficiently bind the nuclear p50p50 from tolerant murine P388 macrophages. Binding is, however, readily detected when the 3' G is replaced by a C. These data show that the detection of upregulated p50 homodimers in LPS tolerant cells is dependent on subtle differences in the sequence of the DNA binding motif.

journal_name

Immunobiology

journal_title

Immunobiology

authors

Frankenberger M,Ziegler-Heitbrock HW

doi

10.1016/s0171-2985(97)80029-0

subject

Has Abstract

pub_date

1997-12-01 00:00:00

pages

81-90

issue

1-3

eissn

0171-2985

issn

1878-3279

pii

S0171-2985(97)80029-0

journal_volume

198

pub_type

杂志文章

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