Effect of staurosporine on transcription factor NF-kappaB in human keratinocytes.

Abstract:

:Activation of the transcription factor NF-kappaB is known to be important in the regulated expression of a large number of pro-inflammatory genes including interleukin-8 (IL-8). Previously, we showed that the protein kinase inhibitor staurosporine potentiates IL-1-stimulated IL-8 production in human keratinocytes. Moreover, recent studies by other investigators demonstrated that staurosporine treatment alone results in a concentration-dependent increase in IL-8 mRNA and protein production. Therefore, in order to understand the mechanism underlying this observation, the effect of staurosporine on the activation of NF-kappaB was investigated. Electrophoretic mobility shift assays using an oligonucleotide containing the NF-kappaB consensus motif demonstrated that staurosporine treatment resulted in the activation of NF-kappaB by 15 min post-treatment. The ability of staurosporine to activate NF-kappaB was investigated further, using luciferase reporters under the control of the HIV-LTR or IL-8 core promoter transfected into human U937 cells. Stimulation with staurosporine resulted in a concentration-dependent induction of luciferase activity. In contrast, the very selective protein kinase C inhibitor 3-[8-[(dimethylamino)methyl]-6,7,8,9-tetrahydropyrido-[1,2-a]indol -10-yl]-4-(1-methyl-3-indolyl)-1H-pyrrole-2,5-dione hydrochloride (Ro32-0432) did not stimulate the activation of NF-kappaB, as measured in the luciferase reporter assay. The mechanism underlying NF-kappaB activation does not appear to involve the classical activation pathways in that staurosporine does not induce the disappearance of IkappaB family members. In conclusion, staurosporine appears to stimulate the activation of NF-kappaB in at least two cell types, and this effect appears to be independent of protein kinase C.

journal_name

Biochem Pharmacol

journal_title

Biochemical pharmacology

authors

Chabot-Fletcher M,Breton JJ

doi

10.1016/s0006-2952(98)00117-8

subject

Has Abstract

pub_date

1998-07-01 00:00:00

pages

71-8

issue

1

eissn

0006-2952

issn

1873-2968

pii

S0006-2952(98)00117-8

journal_volume

56

pub_type

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