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炎症:NR4A 孤儿核受体的作用?

Inflammation: a role for NR4A orphan nuclear receptors?

机构信息

UCD Veterinary Sciences Centre and Conway Institute for Biomolecular and Biomedical Research, University College Dublin, Belfield, Dublin 4, Ireland.

出版信息

Biochem Soc Trans. 2011 Apr;39(2):688-93. doi: 10.1042/BST0390688.

Abstract

Inflammation is paradoxical; it is essential for protection following biological, chemical or physical stimuli, but inappropriate or misdirected inflammation is responsible for tissue injury in a variety of inflammatory diseases. The polarization of immune cells is critical in controlling the stages of inflammatory response. The acute phase of inflammation is characterized by a T-lymphocyte:Th2 cytokine profile and involves a co-ordinated migration of immune cells to the site of injury where production of cytokines and acute-phase proteins brings about healing. However, persistent inflammation can result in inappropriate and prolonged T-lymphocyte:Th1 cytokine-mediated action and reaction of self-molecules, leading to a chronic phase in diseases such as RA (rheumatoid arthritis), Ps (psoriasis) and atherosclerosis. The inflammatory response is also controlled by activated macrophage cells, with classically activated (M1) cells producing a wide variety of pro-inflammatory mediators, while alternatively activated (M2) macrophages participate in anti-inflammatory response. Members of the NR4A subfamily (NR4A1/NUR77, NR4A2/NURR1 and NR4A3/NOR1) of orphan NRs (nuclear receptors) have emerged as key transcriptional regulators of cytokine and growth factor action in diseases affecting our aging population. As ligand-independent and constitutively active receptors, the activity of these transcription factors is tightly controlled at the level of expression, post-translational modification and subcellular localization. NR4A subfamily members are aberrantly expressed in inflamed human synovial tissue, psoriatic skin, atherosclerotic lesions, lung and colorectal cancer cells. Significantly, prolonged or inappropriate inflammatory responses contribute to the pathogenesis of these diseases. In activated cells, NR4A receptors are rapidly and potently induced, suggesting that these receptors may act as important transcriptional mediators of inflammatory signals. NR4A receptors may contribute to the cellular processes that control inflammation, playing a critical part in the contribution of chronic inflammation or they may have a protective role, where they may mediate pro-resolution responses. Here, we will review the contribution of the NR4A orphan NRs to integration of cytokine signalling in inflammatory disorders.

摘要

炎症具有双重性;它在生物、化学或物理刺激后对保护至关重要,但不适当或定向错误的炎症是各种炎症性疾病中组织损伤的原因。免疫细胞的极化对于控制炎症反应的阶段至关重要。炎症的急性期以 T 淋巴细胞:Th2 细胞因子谱为特征,涉及免疫细胞向损伤部位的协调迁移,在此处细胞因子和急性期蛋白的产生带来愈合。然而,持续的炎症可能导致不适当和延长的 T 淋巴细胞:Th1 细胞因子介导的自身分子的作用和反应,导致 RA(类风湿关节炎)、Ps(银屑病)和动脉粥样硬化等疾病的慢性期。炎症反应也受到激活的巨噬细胞的控制,经典激活(M1)细胞产生广泛的促炎介质,而替代激活(M2)巨噬细胞参与抗炎反应。孤儿 NR(核受体)NR4A 亚家族(NR4A1/NUR77、NR4A2/NURR1 和 NR4A3/NOR1)的成员已成为影响我们老龄化人口的疾病中细胞因子和生长因子作用的关键转录调节剂。作为配体非依赖性和组成性激活的受体,这些转录因子的活性在表达、翻译后修饰和亚细胞定位水平受到严格控制。NR4A 亚家族成员在炎症性人类滑膜组织、银屑病皮肤、动脉粥样硬化病变、肺和结直肠癌细胞中异常表达。重要的是,延长或不适当的炎症反应有助于这些疾病的发病机制。在激活的细胞中,NR4A 受体被快速和有效地诱导,这表明这些受体可能作为炎症信号的重要转录调节剂。NR4A 受体可能有助于控制炎症的细胞过程,在慢性炎症的贡献中发挥关键作用,或者它们可能具有保护作用,在这种作用中,它们可能介导促解决反应。在这里,我们将回顾 NR4A 孤儿 NR 对炎症性疾病中细胞因子信号整合的贡献。

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