From the Center for Cardiovascular Disease Prevention, Divisions of Cardiovascular Medicine and Preventive Medicine, Brigham and Women's Hospital, Boston, MA.
Circ Res. 2019 Feb;124(3):437-450. doi: 10.1161/CIRCRESAHA.118.313129.
The recognition that atherosclerosis is a complex chronic inflammatory disorder mediated through both adaptive and innate immunity has led to the hypothesis that anticytokine therapies targeting specific IL (interleukin) signaling pathways could serve as powerful adjuncts to lipid lowering in the prevention and treatment of cardiovascular disease. Cytokines involved in human atherosclerosis can be broadly classified as proinflammatory and proatherogenic (such as IL-1, IL-6, and TNF [tumor necrosis factor]) or as anti-inflammatory and antiatherogenic (such as IL-10 and IL-1rA). The recent CANTOS (Canakinumab Anti-Inflammatory Thrombosis Outcomes Study) has shown that specific targeting of IL-1β can significantly reduce cardiovascular event rates without lipid or blood pressure lowering. In CANTOS, the magnitude of benefit of this cytokine-targeted approach to atherosclerosis treatment was associated to the magnitude of reduction of the central signaling cytokine IL-6 and the downstream clinical biomarker high-sensitivity CRP (C-reactive protein). By contrast, in the recent CIRT (Cardiovascular Inflammation Reduction Trial), low-dose methotrexate neither reduced IL-1β, IL-6, or high-sensitivity CRP nor lowered cardiovascular event rates. Taken together, these 2 contemporary trials provide proof of principle that focused cytokine inhibition, not broad-spectrum anti-inflammatory therapy, is likely to be crucial for atheroprotection. This review provides an overview of cytokines in atherosclerosis, the potential benefits and risks associated with targeted anticytokine therapies, and a look to the future of clinical practices addressing residual inflammatory risk.
人们认识到,动脉粥样硬化是一种复杂的慢性炎症性疾病,通过适应性和先天性免疫介导。这一认识促使人们提出假设,即针对特定白细胞介素(IL)信号通路的抗细胞因子疗法,可能成为降低血脂在预防和治疗心血管疾病方面的有力辅助手段。与人类动脉粥样硬化相关的细胞因子可大致分为促炎和促动脉粥样硬化(如 IL-1、IL-6 和 TNF[肿瘤坏死因子])或抗炎和抗动脉粥样硬化(如 IL-10 和 IL-1rA)。最近的 CANTOS(卡那单抗抗炎血栓结局研究)表明,特异性靶向 IL-1β 可显著降低心血管事件发生率,而无需降低血脂或血压。在 CANTOS 中,这种针对细胞因子的动脉粥样硬化治疗方法的获益幅度与中央信号细胞因子 IL-6 和下游临床生物标志物高敏 CRP(C 反应蛋白)的降低幅度相关。相比之下,在最近的 CIRT(心血管炎症减少试验)中,低剂量甲氨蝶呤既不能降低 IL-1β、IL-6 或高敏 CRP,也不能降低心血管事件发生率。总之,这两项当代试验提供了一个原理证明,即靶向细胞因子抑制而不是广谱抗炎治疗,可能对动脉粥样硬化保护至关重要。这篇综述概述了动脉粥样硬化中的细胞因子、靶向抗细胞因子疗法的潜在益处和风险,以及针对残余炎症风险的临床实践的未来展望。
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