RelB Modulation of IκBα Stability as a Mechanism of Transcription Suppression of Interleukin-1α (IL-1α), IL-1β, and Tumor Necrosis Factor Alpha in Fibroblasts

RelB Modulation of IκBα Stability as a Mechanism of Transcription Suppression of Interleukin-1α (IL-1α), IL-1β, and Tumor Necrosis Factor Alpha in Fibroblasts
复制标题

RelB 调节 IκBα 稳定性作为成纤维细胞中白细胞介素 1α (IL-1α)、IL-1β 和肿瘤坏死因子 α 转录抑制的机制

DOI:
--
复制
发表时间:
1999
影响因子:
5.3
通讯作者:
Lili Feng
Lili Feng
中科院分区:
生物学2区
文献类型:
--
作者:
Yiyang Xia;Shizhong Chen;Yibin Wang;N. Mackman;G. Ku;David Lo;Lili Feng

文献摘要

参考文献

被引文献

相似文献

摘要 NF-κB/RelB 转录因子家族成员在炎症和免疫反应的调节中发挥着重要作用。 RelB 是该家族的成员,已被定性为转录激活剂,并参与淋巴组织中的组成型 NF-κB 活性。然而,在之前的一项研究中,我们观察到 RelB 缺陷的成纤维细胞中趋化因子过度表达。在此我们表明,RelB 是成纤维细胞中重要的转录抑制因子,它限制促炎介质的表达,并可能通过调节 IκBα 蛋白的稳定性来发挥其功能。来自 relb −/− 小鼠的成纤维细胞响应脂多糖 (LPS) 刺激过度表达白细胞介素 1α (IL-1α)、IL-1β 和肿瘤坏死因子 α。尽管 IκBα mRNA 表达上调,但这些细胞具有增强且延长的 LPS 诱导 IKK 活性和加速降解,导致 IκBα 蛋白水平降低。因此,这些细胞中 NF-κB 活性增强,诱导后 NF-κB 活性抑制受损。通过将 RelB cDNA 或显性失活 IκBα 引入 relb -/- 成纤维细胞,可以抑制增加的 κB 结合活性和细胞因子过度表达。我们的研究结果表明 RelB 在成纤维细胞中具有新的转录抑制功能。
ABSTRACT Members of the NF-κB/RelB family of transcription factors play important roles in the regulation of inflammatory and immune responses. RelB, a member of this family, has been characterized as a transcription activator and is involved in the constitutive NF-κB activity in lymphoid tissues. However, in a previous study we observed an overexpression of chemokines in RelB-deficient fibroblasts. Here we show that RelB is an important transcription suppressor in fibroblasts which limits the expression of proinflammatory mediators and may exert its function by modulating the stability of IκBα protein. Fibroblasts from relb −/− mice overexpress interleukin-1α (IL-1α), IL-1β, and tumor necrosis factor alpha in response to lipopolysaccharide (LPS) stimulation. These cells have an augmented and prolonged LPS-inducible IKK activity and an accelerated degradation which results in a diminished level of IκBα protein, despite an upregulated IκBα mRNA expression. Consequently, NF-κB activity was augmented and postinduction repression of NF-κB activity was impaired in these cells. The increased κB-binding activity and cytokine overexpression was suppressed by introducing RelB cDNA or a dominant negative IκBα into relb −/−fibroblasts. Our findings suggest a novel transcription suppression function of RelB in fibroblasts.
DOI: --
发表时间: 1995
期刊: --
影响因子: --
作者:
J. Brockman;D. Scherer;T. McKinsey;S. M. Hall;X. Qi;Wha-Young Lee;Anddean W. Ballard
通讯作者: J. Brockman;D. Scherer;T. McKinsey;S. M. Hall;X. Qi;Wha-Young Lee;Anddean W. Ballard
胸腺皮质上皮足以在 relB 缺陷小鼠中发育成熟 T 细胞。
DOI: --
发表时间: 1997
期刊: Journal of immunology (Baltimore, Md. : 1950)
影响因子: --
作者:
DeKoning,J;DiMolfetto,L;Reilly,C;Wei,Q;Havran,WL;Lo,D
通讯作者: Lo,D
E-选择素和血管细胞粘附分子-1 的诱导后转录抑制。
DOI: --
发表时间: 1996
期刊: Journal of immunology (Baltimore, Md. : 1950)
影响因子: --
作者:
Read,MA;Neish,AS;Gerritsen,ME;Collins,T
通讯作者: Collins,T
由整合转基因引起的淋巴细胞或粒细胞功能的隐性缺陷。
DOI: --
发表时间: 1992
期刊: The American journal of pathology
影响因子: --
作者:
Lo,D;Quill,H;Burkly,L;Scott,B;Palmiter,RD;Brinster,RL
通讯作者: Brinster,RL
DOI: --
发表时间: 1997-08
期刊: The American journal of pathology
影响因子: --
作者:
Roger S Smith;Terry J. Smith;T. Blieden;R. Phipps
通讯作者: Roger S Smith;Terry J. Smith;T. Blieden;R. Phipps