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. 1997 May;65(5):1640–1643. doi: 10.1128/iai.65.5.1640-1643.1997

Inhibition of lipopolysaccharide-induced transcription factor Sp1 binding by spectrally pure diphosphoryl lipid A from Rhodobacter sphaeroides, protein kinase inhibitor H-8, and dexamethasone.

B W Jarvis 1, N Qureshi 1
PMCID: PMC175189  PMID: 9125541

Abstract

The transcription factor Sp1 plays a crucial role in the monocyte-specific expression of CD14, a binding site (or putative receptor) for lipopolysaccharide (LPS) complexes with LPS-binding protein (LBP). By using RAW 264.7 macrophages treated with spectrally pure deep-rough-chemotype hexa-acyl LPS from Escherichia coli D31m4, three inhibitors were found to block the binding activity of transcription factor Sp1, as measured by electrophoretic mobility shift assays. These inhibitors were diphosphoryl lipid A from Rhodobacter sphaeroides (10 microg/ml); the isoquinoline-sulfonamide H-8 (10 and 100 microM), which is thought to be a cGMP-dependent protein kinase inhibitor; and the anti-inflammatory agent dexamethasone (10 microM).

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Selected References

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