Di Stefano Rossella, Felice Francesca, Balbarini Alberto
Thoracic and Vascular Department, University of Pisa, Italy.
Curr Pharm Des. 2009;15(10):1095-106. doi: 10.2174/138161209787846892.
Atherosclerosis is now generally accepted as an inflammatory disease, characterized by degenerative changes and extracellular accumulation of lipid and cholesterol. The evolving inflammatory reaction plays an important role in the initiation of atherosclerotic plaques and their destabilization, converting a chronic process into an acute disorder with an ensuing thrombo-embolism. Neovascularization has been, also, recognized as an important process for the progression of atherosclerotic plaques. In fact, vulnerable atherosclerotic plaque prone to rupture are characterized by an enlarged necrotic core containing an increased number of vasa vasorum, apoptotic macrophages, and more frequent intraplaque haemorrhage. Various functional roles have been assigned to intimal microvessels. This network of immature blood vessels is a viable source of intraplaque haemorrhage providing erythrocyte-derived phospholipids and free cholesterol. However, it is still challenging and controversial the relationship between the very process of angiogenesis and its causal association with the progression and complication of atherosclerosis. The selective targeting of neoangiogenesis poses a possible approach for the elimination of pre-existing and new growth of microvessels. The identification of target lesions is a critical issue, because current technologies have yet to achieve the goal of characterizing plaque morphology to the degree necessary to correctly identify rupture-prone lesions according to pathologic criteria. However, few imaging techniques can be used to detect the neovascularization within the atherosclerotic plaque in vivo. This review discusses the potential role of intraplaque angiogenesis as risk factor for plaque vulnerability.
动脉粥样硬化现在已被普遍认为是一种炎症性疾病,其特征为脂质和胆固醇的退行性变化及细胞外积聚。不断演变的炎症反应在动脉粥样硬化斑块的形成及其不稳定过程中起着重要作用,将一个慢性过程转变为急性病症并随之引发血栓栓塞。血管新生也被认为是动脉粥样硬化斑块进展的一个重要过程。事实上,易于破裂的易损动脉粥样硬化斑块的特征是坏死核心增大,其中包含数量增多的滋养血管、凋亡巨噬细胞以及更频繁的斑块内出血。内膜微血管具有多种功能作用。这个不成熟血管网络是斑块内出血的一个可行来源,可提供红细胞衍生的磷脂和游离胆固醇。然而,血管生成过程与其与动脉粥样硬化进展及并发症的因果关系之间的联系仍然具有挑战性且存在争议。选择性靶向血管新生为消除既有微血管和新生微血管生长提供了一种可能的方法。识别目标病变是一个关键问题,因为目前的技术尚未达到根据病理标准准确识别易破裂病变所需的斑块形态特征化程度。然而,很少有成像技术可用于在体内检测动脉粥样硬化斑块内的血管新生。本综述讨论了斑块内血管生成作为斑块易损性危险因素的潜在作用。
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