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Epidermal growth factor activation of NF-kappaB is mediated through IkappaBalpha degradation and intracellular free calcium.

Abstract：

:The transcription factor NF-kappa-B is normally sequestered in the cytoplasm by its inhibitory subunit IkappaB. Most extracellular signals activate NF-kappa-B through a mechanism involving the phosphorylation and proteasome-dependent degradation of IkappaB. EGF activates NF-kappaB in A-431 carcinoma cells, which overexpress EGF receptors and in mouse embryo fibroblasts, which have a normal complement of receptors. Supershift experiments indicate that the NF-kappa-B complexes induced by EGF are composed of p50/p50 homodimers and p65/p50 heterodimers, but not c-rel. EGF stimulation enhances the degradation of IkappaBalpha, but not IkappaBbeta nor an N-terminal deletion mutant of IkappaBalpha. Treatment of cells with a proteasome inhibitor, such as ALLN or MG132, blocks EGF-mediated NF-kappaB activation, indicating that EGF-induced NF-kappa-B activation requires proteasome-dependent IkappaB degradation. Also, Bapta A/M (a cell-permeable chelator of intracellular calcium) blocks EGF-induced NF-kappa-B activation and IkappaBalpha degradation, suggesting a requirement of intracellular free Ca2+ for this growth factor response. Protein kinase C inhibition, in contrast, did not influence EGF activation of NF-kappaB.

journal_name

Oncogene

journal_title

Oncogene

authors

Sun L,Carpenter G

doi

10.1038/sj.onc.1201731

subject

Has Abstract

pub_date

1998-04-23 00:00:00

pages

2095-102

issue

16

eissn

0950-9232

issn

1476-5594

journal_volume

16

pub_type

杂志文章

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