核转录因子-κB与前列腺肿瘤

核转录因子NF-кB具有多向性调节作用,可在多种因素作用下被激活,参与调控多种基因的表达;参与免疫反应、胚胎发育、凋亡、肿瘤形成和转移等多种生理及病理过程;并与肿瘤转移过程中起重要作用的粘附分子和细胞外基质蛋白水解酶等分泌调节有关.前列腺肿瘤的发生、发展及浸润转移,与NF-кB及其抑制因子间正常平衡的破坏及随之而来的系列NF-кB依赖基因表达的改变密切相关.本文综述了NF-кB与恶性肿瘤发生、发展、浸润转移的关系及与NF—κB相关的抗肿瘤策略.     

核转录因子-κB与前列腺肿瘤

核转录因子NF-κB具有多向性调节作用,可在多种因素作用下被激活,参与调控多种基因的表达;参与免疫反应、胚胎发育、凋亡、肿瘤形成和转移等多种生理及病理过程;并与肿瘤转移过程中起重要作用的粘附分子和细胞外基质蛋白水解酶等分泌调节有关.前列腺肿瘤的发生、发展及浸润转移,与NF-κB及其抑制因子间正常平衡的破坏及随之而来的系列NF-κB依赖基因表达的改变密切相关.本文综述了NF-κB与恶性肿瘤发生、发展、浸润转移的关系及与NF-κB相关的抗肿瘤策略.     

核转录因子—κB与免疫应答

核转录因子-κB(nuclear factor κB，NF—κB)是一种重要的核转录因子，NF-κB系统由NF-κB／Rel蛋白家族和IκB蛋白家族组成，通过对多种基因表达的调节，影响机体非特异性免疫反应和特异性免疫反应，从而在体机免疫功能调节中发挥重要作用。本文就NF-κB在免疫应答中的作用作一综述。     

核转录因子-κB与免疫应答

核转录因子 κB(nuclearfactorκB ,NF κB)是一种重要的核转录因子 ,NF κB系统由NF κB Rel蛋白家族和IκB蛋白家族组成 ,通过对多种基因表达的调节 ,影响机体非特异性免疫反应和特异性免疫反应 ,从而在体机免疫功能调节中发挥重要作用。本文就NF κB在免疫应答中的作用作一综述。     

核因子-κB与神经损伤

核因子κB（nuclear factor kappa B，NF-κB）是在1986年由Sen和Baltimore 应用凝胶电泳迁移率实验（EMSA）分析B细胞核提取物中发现的。最近研究表明，NF-κB是一种重要的转录因子，广泛存在于真核细胞中，参与多种基因的表达调控，具有广泛的生物活性，能够促进多种细胞因子、粘附因子和趋化因子的基因转录，在炎症反应中起重要作用，具有多种生物学功能。NF--κB存在于神经系统几乎所有类型的细胞中，主要包括神经元、星胶质细胞、小胶质细胞和少突细胞，在神经塑型、神经发育及神经变性等过程中具有独特作用并参与神经系统的病理、生理过程，尤其是在中枢神经损伤和变性疾病中发挥着重要作用。     

核因子-κB信号转导途径的调节研究进展

在静息状态时 ,核因子 κB((nuclearfactorκB ,NF κB)通常与其抑制物以无活性的复合物形式存在于胞浆 ,当受到胞外信号刺激时 ,通过一个或多个信号转导途径 ,激活一系列激酶 ,迅速从胞浆易位到胞核 ,调控相应靶基因的表达。目前发现它是免疫和炎症反应的主要调节因子 ,也参与胚胎发育、细胞周期的调控、细胞凋亡的调节 ,NF κB的过度表达与多种疾病的免疫病理机制有关。近年来许多学者深入探讨了NF κB信号转导途径的调节机制 ,使得许多疾病的发病机制得以进一步阐明 ,并最终为其治疗提供了理论基础     

NF-κB/IκB:重要的转录调节因子

核转录因子ｋａｐｐａ Ｂ（ＮＦκＢ）是一组重要的转录调节因子,可在免疫刺激剂等多种因素作用下激活而调节基因的转录,参与调节许多与免疫功能和炎症有关的基因。ＩκＢ（Ｉｎｈｉｂｉｔｏｒｙ ＮＦκＢ）是其抑制分子,对其激活的调控起着关键作用。本文综述了ＮＦκＢ激活及调控的有关机理,为对其进一步研究提供理论依据。     

核因子-κB与急性胰腺炎发病机制的研究进展

核因子 κB(NF κB)是一种能与体内多种细胞基因启动子部位结合的核蛋白 ,是一种多向性、多效性调控因子 ,在机体的免疫和炎症反应、凋亡调控等方面发挥重要作用 ,其过度活化可引起多种病理生理反应。目前发现NF κB参与了急性胰腺炎 (acutepancreatitis,AP)的病理生理过程 ,在分子水平上探讨NF κB在AP发病机制中的作用将为该疾病的临床治疗提供重要的理论依据 ,为AP的治疗开辟新的途径。     

核因子NF-κB在胰腺炎细胞模型中的实验研究

目的：探讨急性胰腺炎（AP）时核因子NF-κB激活的情况及NF-κB在AP病程中的作用。方法：实验分为两组：A组（对照组）,B组（将AR42J细胞以caerulein作用制成AP细胞模型）。检测淀粉酶及乳酸脱氢酶（LDH）释放的情况;另取1ml培养液上清加入接种巨噬细胞的培养板中培养,然后,收集巨噬细胞进行NF-κB激活检测。结果：B组胰腺腺泡细胞内容物淀粉酶、LDH的释放与A组比较明显增加（P〈0.05）;B组NF-κB激活较A组明显升高（P〈0.05）。结论：AP时可影响核因子NF-κB激活,胰腺炎胰腺腺泡细胞内容物的释放增加时则NF-κB激活水平升高。     

Inhibition of nuclear factor kappa B activation reduces Coxsackievirus B3 replication in lymphoid cells

Interactions between viral replication machineries and host cell metabolism display interesting information how certain viruses capitalize cellular pathways to support progeny production. Among those pathogens, Coxsackievirus B3 (CVB3) has been identified to manipulate intracellular signaling very comprehensively. Next to others, this human pathogenic virus causes acute and chronic forms of myocarditis, pancreatitis, and meningitis. Here, activation of nuclear factor kappa B (NFκB) signaling appears to be involved in successful infection. Viral replication is not restricted to solid organs but involves susceptible immune cells as well. In the present study, p65 phosphorylation as one aspect of NFκB activation and inhibition via BAY 11-7085 administration was analyzed in the context of CVB3 replication in lymphoid cells. During CVB3 infection, an up-regulation of p65 translation is detectable, which is accompanied by noticeable phosphorylation. Inhibition of NFκB signaling reduces viral replication in a dose- and time-dependent manner. Taken together, these results indicate that during CVB3 replication in human and murine lymphoid cells, NFκB signaling is activated and facilitates viral replication. Therefore, antiviral strategies to target such central cellular signaling pathways may represent potential possibilities for the development of new virostatica.     

Glutamine decreases intestinal nuclear factor kappa B activity and pro-inflammatory cytokine expression after traumatic brain injury in rats

Objective: To investigate whether glutamine supplementation modulates intestinal nuclear factor kappa B (NF-κB) activity and pro-inflammatory cytokine expression after traumatic brain injury (TBI) in rats. Materials and methods: Right parietal cortical contusion in male rats was made by the weight-dropping method. After trauma, the rats were randomly given chow alone or glutamine mixed chow for 5 d. Gut samples were extracted at 5 d postinjury. We measured NF-κB binding activity by electrophoretic mobility shift assay; NF-κB subunits p50 and p65 expression by immunohistochemistry; the concentrations of interleukin-1β, tumor necrosis factor-α and interleukin-6 by enzyme-linked immunosorbent assay; intestinal mucosal morphological changes by histopathological study and electron microscopy; and apoptosis by terminal deoxynucleotidyl transferase-mediated dUTP nick end labeling staining. Results: Administration of glutamine following TBI could decrease NF-κB binding activity, NF-κB p65 protein expression and concentrations of pro-inflammatory cytokines in the gut. TBI-induced damage of gut structure was ameliorated after glutamine supplementation. Conclusion: The results of the present study suggest that the therapeutic benefit of post-TBI glutamine supplementation might be due to its inhibitory effects on intestinal NF-κB activation and pro-inflammatory cytokine expression. Received 14 May 2007; returned for revision 9 July 2007; accepted by I. Ahnfeld-R?nne 16 August 2007     

LPS致大鼠肺泡巨噬细胞NF-κB促进TNF-α分泌

目的: 观察脂多糖（LPS）致大鼠肺泡巨噬细胞（AMs）中核因子NF-κB活性及其调控肿瘤坏死因子-α（TNF-α）分泌的作用。 方法: LPS作用大鼠AMs后，用电泳迁移率改变分析法（EMSA）测NF-κB活性；用特异的反义寡核苷酸阻断NF-κB亚基（p65）后，Western blotting检测p65表达变化；ELISA法检测细胞上清中TNF-α的含量。 结果: 于LPS作用AMs后4 h，NF-κB活性达到峰值，24 h仍维持在高水平；作用后4 h上清中TNF-α的含量达到峰值。反义寡核苷酸阻断NF-κB亚基（p65）表达后，LPS致AMs上清中TNF-α的含量显著低于未阻断组（P<0.01）。结论: LPS致大鼠AMs中NF-κB正向调控TNF-α分泌。     

Influence of receptor activator of nuclear factor kappa B on human aortic valve myofibroblasts

Calcific aortic valve stenosis, the main heart valve disease in the elderly, is based on progressive calcification and fibrous thickening of the valve. Several reports addressed the pathogenesis of tissue calcification in this disorder, but few data exist on the molecular mechanisms of the fibrosis and remodeling of the extracellular matrix. The cytokine "receptor activator of nuclear factor kappa B ligand" (RANKL), is expressed in stenotic aortic valves and involved in valvular calcification during calcific aortic valve stenosis. The present study aimed to assess the influence of RANKL on the molecular mechanisms of connective tissue remodeling. In an established cell culture model of primary human aortic valve myofibroblasts, stimulation with RANKL increased cell proliferation as compared to medium alone. Matrix metalloproteinase (MMP)-1 was detectable time-dependently in conditioned media from RANKL-stimulated cells, but absent in media from control cells. MMP-1 activity was increased by RANKL, as measured by collagenase activity assay. Zymography showed an increase in active MMP-2 in RANKL-stimulated cells. These results support the concept that MMPs are involved in the connective tissue remodeling during calcific aortic valve stenosis. RANKL might regulate this process by promoting cell proliferation and MMP expression and activation.