Department of Internal Medicine III, Martin-Luther-University Halle-Wittenberg, Halle (Saale), Germany.
J Cell Mol Med. 2011 Mar;15(3):484-500. doi: 10.1111/j.1582-4934.2010.01245.x.
Inflammation is a central element of atherogenesis. Innate pathways contribute to vascular inflammation. However, the initial molecular process(es) starting atherogenesis remain elusive. The various risk factors, represented by particular compounds (activators), may cause altered cellular functions in the endothelium (e.g. vascular endothelial cell activation or -dysfunction), in invading cells (e.g. inflammatory mediator production) or in local vessel wall cells (e.g. inflammatory mediators, migration), thereby triggering the innate inflammatory process. The cellular components of innate immunology include granulocytes, natural killer cells and monocytes. Among the molecular innate constituents are innate molecules, such as the toll-like receptors or innate cytokines. Interleukin-1 (IL-1) and IL-6 are among the innate cytokines. Cytokines are potent activators of a great number of cellular functions relevant to maintain or commove homeostasis of the vessel wall. Within the vessel wall, vascular smooth muscle cells (SMCs) can significantly contribute to the cytokine-dependent inflammatory network by: (i) production of cytokines, (ii) response to cytokines and (iii) cytokine-mediated interaction with invading leucocytes. The cytokines IL-1 and IL-6 are involved in SMC-leucocyte interaction. The IL-6 effects are proposed to be mediated by trans-signalling. Dysregulated cellular functions resulting from dysregulated cytokine production may be the cause of cell accumulation, subsequent low-density lipoprotein accumulation and deposition of extracellular matrix (ECM). The deposition of ECM, increased accumulation of leucocytes and altered levels of inflammatory mediators may constitute an 'innate-immunovascular-memory' resulting in an ever-growing response to anew invasion. Thus, SMC-fostered inflammation, promoted by invading innate cells, may be a potent component for development and acceleration of atherosclerosis.
炎症是动脉粥样硬化形成的核心要素。先天途径有助于血管炎症。然而,启动动脉粥样硬化形成的最初分子过程仍然难以捉摸。各种风险因素,表现为特定的化合物(激活剂),可能导致内皮细胞(例如血管内皮细胞激活或功能障碍)、入侵细胞(例如炎症介质产生)或局部血管壁细胞(例如炎症介质、迁移)的细胞功能改变,从而触发先天炎症过程。先天免疫的细胞成分包括粒细胞、自然杀伤细胞和单核细胞。先天分子包括先天分子,如 Toll 样受体或先天细胞因子。白细胞介素 1(IL-1)和白细胞介素 6(IL-6)是先天细胞因子之一。细胞因子是许多与维持或改变血管壁内稳态相关的细胞功能的有效激活剂。在血管壁内,血管平滑肌细胞(SMC)通过以下方式显著促进细胞因子依赖性炎症网络:(i)细胞因子的产生,(ii)细胞因子的反应,和(iii)细胞因子介导的与入侵白细胞的相互作用。白细胞介素 1(IL-1)和白细胞介素 6(IL-6)参与 SMC-白细胞相互作用。IL-6 效应被认为是通过转信号传导介导的。细胞因子产生失调导致的细胞功能失调可能是细胞积累、随后低密度脂蛋白积累和细胞外基质(ECM)沉积的原因。ECM 的沉积、白细胞的积累增加和炎症介质水平的改变可能构成一个“先天免疫-血管-记忆”,导致对新入侵的反应不断增强。因此,由入侵先天细胞促进的 SMC 炎症可能是动脉粥样硬化发展和加速的一个有力组成部分。
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