Blood:TLT-1是ALI/ARDS的独立的预后标志物,可减轻急性肺损伤

2018-10-07 MedSci MedSci原创

每年超过20万人罹患急性肺损伤(ALI)和急性呼吸窘迫综合征(ARDS),死亡率高达40%。虽然血小板也参与ALI/ARDS进展,但其确切作用尚不明确。研究人员在血小板上发现了在髓细胞中表达的触发受体(TREM)样转录本(TLT)-1,可结合纤维蛋白原,介导血块形成。因而研究人员推测血小板通过TLT-1主导ALI/ARDS的进展。为证明上述推测,研究人员回顾性检测ARDSNET临床试验样本的血浆s

每年超过20万人罹患急性肺损伤(ALI)和急性呼吸窘迫综合征(ARDS),死亡率高达40%。虽然血小板也参与ALI/ARDS进展,但其确切作用尚不明确。

研究人员在血小板上发现了在髓细胞中表达的触发受体(TREM)样转录本(TLT)-1,可结合纤维蛋白原,介导血块形成。因而研究人员推测血小板通过TLT-1主导ALI/ARDS的进展。

为证明上述推测,研究人员回顾性检测ARDSNET临床试验样本的血浆sTLT-1水平,结果显示sTLT-1水平>1200pg/mL的患者的死亡风险几乎是sTLT-1水平<1200 pg/mL患者的两倍(p<0.001)。经混杂因素(如肌酐水平、APACHE III评分、年龄、血小板计数和肺通气量)校正后,sTLT-1仍存在显著性:提示sTLT-1是独立的预测因子(p<0.0001)。

上述结果表明在ALI/ARDS的进展中,TLT-1发挥重要作用。研究人员采用小鼠脂多糖诱导的ALI模型发现,在缺乏TLT-1的情况下,牙龈出血、中性粒细胞异常迁移积累均与纤维蛋白原聚集减少、肺组织损伤增多相关。

TLT-1缺失会导致血小板-中性粒细胞偶联(与中性粒细胞死亡相关)的比例增高(43.73±24.75% vs 8.92±2.4%[野生型小鼠])。输注sTLT-1可恢复正常的纤维蛋白原沉积,并减少40%的肺出血(p≤0.001)和25%的组织损伤(p≤0.001)。

综上所述,本研究表明在ARDS进程中,TLT-1通过纤维蛋白原介导炎症与出血之间的过渡,并协助调控白细胞迁移。


原始出处:

Jessica Morales-Ortíz, et al. TLT-1 is a Prognostic Indicator in ALI/ARDS and Prevents Tissue Damage in the Lungs in a Mouse model. Blood  2018  :blood-2018-03-841593;  doi: https://doi.org/10.1182/blood-2018-03-841593

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    2018-12-14 drwjr
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    2018-10-12 zxl729
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    2018-10-09 tastas
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血小板是从骨髓成熟的巨核细胞胞浆脱落下来的小块胞质,形态一般为圆盘形,直径1~4μm到7~8μm不等,且个体差异很大。

JCEM:糖尿病与血小板对低剂量阿司匹林的反应

由此可见,体外血小板对阿司匹林的反应与糖尿病状态没有差异,表明血小板对阿司匹林的反应没有内在差异。相反,应研究外在因素对血小板功能的影响,以进一步深入了解阿司匹林用于糖尿病的一级预防。