Extracellular Matrix Glycoprotein Thrombospondin 1: An Overlooked Pathological Mediator in Vasculopathy of Systemic Sclerosis-Secondary Raynaud’s Phenomena

Zulfa Allaf, Megan Yao
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Abstract

Systemic sclerosis (SSc) is an autoimmune connective tissue disorder characterized by a widespread vasculopathy, autoimmunity, and fibrosis of the skin and internal organs such as the lung and kidneys. Raynaud's phenomenon is the earliest recognized symptom of SSc. Unlike the primary Raynaud's disease, the condition responds well to management with non-pharmacological measures and pharmacological agents, Raynaud's phenomenon presented complex and progressive vasculopathy in the superficial vasculature embedded under the skin. The mechanisms underlying the development and progress of Raynaud's phenomenon are still unclear. Repeated Raynaud's phenomenon attacks are characteristic of ischemia-reperfusion episodes with different durations. What occurred to the superficial vascular bed highly possibly replicates at the vasculature in the vulnerable internal organ(s) at a later time and a distinctive pace. Elevated extracellular matrix glycoprotein thrombospondin 1 (TSP1) levels are found in circulation and throughout the skin in patients with SSc. TSP1-mediated vascular pathologies have been extensively investigated in multiple conditions, including hypertension, pulmonary arterial hypertension, and renal ischemia-reperfusion injury. TSP1 vasculopathy in these conditions is evidenced by a variety of function-modulating and vascular remodeling effects, specifically enhancing vasoconstrictive tone, platelet hyperaggregation, and inflammatory cell infiltration, inducing capillary rarefaction and promoting intimal thickening. In addition, the well-known anti-angiogenic property of TSP1 significantly impairs the self-repair and self-renewal capacity of growth factor-or stem cell-based regenerative therapies. Thanks to the growing knowledge of TSP1 vasculopathy in affected internal organs and adverse effects on regrowth, it is proposed that pathological levels of TSP1 may exert a similar pattern of multifaceted effects on the vasculature in SSc and regenerative therapies under investigation.
细胞外基质糖蛋白-血小板反应蛋白1:在系统性硬化症-继发性雷诺现象血管病变中被忽视的病理介质
系统性硬化症(SSc)是一种自身免疫性结缔组织疾病,其特征是广泛的血管病变、自身免疫以及皮肤和内脏器官(如肺和肾脏)的纤维化。雷诺现象是SSc最早被发现的症状。与原发性雷诺氏病不同,该疾病对非药物措施和药物治疗反应良好,雷诺氏病表现为复杂的进行性血管病变,位于皮肤下的浅表脉管系统。雷诺现象发生和发展的机制尚不清楚。重复雷诺现象发作是缺血再灌注发作的特征,其持续时间不同。发生在浅层血管床上的情况很可能在稍后的时间以独特的速度在脆弱的内部器官的脉管系统中复制。升高的细胞外基质糖蛋白血小板反应蛋白1 (TSP1)水平发现循环和整个皮肤的SSc患者。tsp1介导的血管病变已在多种情况下被广泛研究,包括高血压、肺动脉高压和肾缺血再灌注损伤。这些条件下的TSP1血管病变表现为多种功能调节和血管重塑作用,特别是增强血管收缩张力、血小板高聚集和炎症细胞浸润,诱导毛细血管稀疏和促进内膜增厚。此外,众所周知,TSP1的抗血管生成特性显著损害了生长因子或干细胞再生疗法的自我修复和自我更新能力。由于对受影响内脏器官的TSP1血管病变及其对再生的不良影响的了解越来越多,我们提出病理水平的TSP1可能在SSc和正在研究的再生治疗中对脉管系统产生类似的多方面影响。
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