Xu Xiaohong Ruby, Carrim Naadiya, Neves Miguel Antonio Dias, McKeown Thomas, Stratton Tyler W, Coelho Rodrigo Matos Pinto, Lei Xi, Chen Pingguo, Xu Jianhua, Dai Xiangrong, Li Benjamin Xiaoyi, Ni Heyu
Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, ON Canada ; Department of Laboratory Medicine, Keenan Research Centre for Biomedical Science, St. Michael's Hospital, Toronto, ON Canada ; Guangdong Provincial Hospital of Chinese Medicine, Guangzhou University of Chinese Medicine, Guangzhou, Guangdong People's Republic of China.
Department of Laboratory Medicine, Keenan Research Centre for Biomedical Science, St. Michael's Hospital, Toronto, ON Canada ; Canadian Blood Services, Toronto, ON Canada.
Thromb J. 2016 Oct 4;14(Suppl 1):29. doi: 10.1186/s12959-016-0100-6. eCollection 2016.
Platelets are central mediators of thrombosis and hemostasis. At the site of vascular injury, platelet accumulation (i.e. adhesion and aggregation) constitutes the first wave of hemostasis. Blood coagulation, initiated by the coagulation cascades, is the second wave of thrombin generation and enhance phosphatidylserine exposure, can markedly potentiate cell-based thrombin generation and enhance blood coagulation. Recently, deposition of plasma fibronectin and other proteins onto the injured vessel wall has been identified as a new "protein wave of hemostasis" that occurs prior to platelet accumulation (i.e. the classical first wave of hemostasis). These three waves of hemostasis, in the event of atherosclerotic plaque rupture, may turn pathogenic, and cause uncontrolled vessel occlusion and thrombotic disorders (e.g. heart attack and stroke). Current anti-platelet therapies have significantly reduced cardiovascular mortality, however, on-treatment thrombotic events, thrombocytopenia, and bleeding complications are still major concerns that continue to motivate innovation and drive therapeutic advances. Emerging evidence has brought platelet adhesion molecules back into the spotlight as targets for the development of novel anti-thrombotic agents. These potential antiplatelet targets mainly include the platelet receptors glycoprotein (GP) Ib-IX-V complex, β3 integrins (αIIb subunit and PSI domain of β3 subunit) and GPVI. Numerous efforts have been made aiming to balance the efficacy of inhibiting thrombosis without compromising hemostasis. This mini-review will update the mechanisms of thrombosis and the current state of antiplatelet therapies, and will focus on platelet adhesion molecules and the novel anti-thrombotic therapies that target them.
血小板是血栓形成和止血的核心介质。在血管损伤部位,血小板聚集(即黏附和凝集)构成止血的第一波。由凝血级联反应启动的血液凝固是第二波,凝血酶生成并增强磷脂酰丝氨酸暴露,可显著增强基于细胞的凝血酶生成并促进血液凝固。最近,血浆纤连蛋白和其他蛋白质在受损血管壁上的沉积已被确定为一种新的“止血蛋白波”,它发生在血小板聚集之前(即经典的第一波止血)。在动脉粥样硬化斑块破裂的情况下,这三波止血过程可能会致病,并导致不受控制的血管闭塞和血栓形成性疾病(如心脏病发作和中风)。目前的抗血小板疗法已显著降低心血管死亡率,然而,治疗期间的血栓形成事件、血小板减少症和出血并发症仍然是主要问题,这继续推动创新并促进治疗进展。新出现的证据使血小板黏附分子重新成为开发新型抗血栓药物的靶点。这些潜在的抗血小板靶点主要包括血小板受体糖蛋白(GP)Ib-IX-V复合物、β3整合素(β3亚基的αIIb亚基和PSI结构域)和GPVI。人们已经做出了许多努力,旨在在不影响止血的情况下平衡抑制血栓形成的疗效。本综述将更新血栓形成的机制和抗血小板治疗的现状,并将重点关注血小板黏附分子以及针对它们的新型抗血栓治疗。