期刊
MOLECULAR AND CELLULAR BIOLOGY
卷 24, 期 17, 页码 7806-7819出版社
AMER SOC MICROBIOLOGY
DOI: 10.1128/MCB.24.17.7806-7819.2004
关键词
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资金
- NCI NIH HHS [CA73675, P01 CA078778, CA78778] Funding Source: Medline
Nuclear factor kappaB (NF-kappaB) and activator protein 1 (AP-1) transcription factors regulate many important biological and pathological processes. Activation of NF-kappaB is regulated by the inducible phosphorylation of NF-kappaB inhibitor IkappaB by IkappaB kinase. In contrast, Fos, a key component of AP-1, is primarily transcriptionally regulated by serum responsive factors (SRFs) and ternary complex factors (TCFs). Despite these different regulatory mechanisms, there is an intriguing possibility that NF-KB and AP-1 may modulate each other, thus expanding the scope of these two rapidly inducible transcription factors. To determine whether NF-KB activity is involved in the regulation of fos expression in response to various stimuli, we analyzed activity of AP-1 and expression of fos, fosB, fra-1, fra-2, jun, junB, and junD, as well as AP-1 downstream target gene VEGF, using MDAPanc-28 and MDAPanc-28/IkappaBalphaM pancreatic tumor cells and wild-type, IKK1(-/-), and IKK2(-/-) murine embryonic fibroblast cells. Our results show that elk-1, a member of TCFs, is one of the NF-KB downstream target genes. Inhibition of NF-KB activity greatly decreased expression of elk-1. Consequently, the reduced level of activated Elk-1 protein by extracellular signal-regulated kinase impeded constitutive, serum-, and superoxide-inducible c-fos expression. Thus, our study revealed a distinct and essential role of NF-KB in participating in the regulation of elk-1, c-fos, and VEGF expression.
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