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首页> 外文期刊>British Journal of Cancer >The Role of Blood Platelets in Experimental Metastases
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The Role of Blood Platelets in Experimental Metastases

机译:血小板在实验性转移中的作用

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After the intravenous injection of Walker 256 tumour cells into rats the platelet count decreased rapidly and remained low during the following period of observation. The platelet decrease was closely related to the number of cells injected. Intra-arterial tumour cell injections required a considerably higher tumour cell count to produce a comparable thrombocytopenia. Non-viable tumour cells and tumour cell fragments induced a similar decrease of circulating platelets. Neither viable tumour cells nor tumour cell fragments aggregated rat platelets in vitro. The presence of fibrin monomers in tumour cell injected animals suggested intravascular fibrin deposition; the plasma fibrinogen level, however, did not decrease significantly. Isotope studies using 51Cr labelled platelets revealed a rapid disappearance of the platelets from the circulation and their trapping in the lung—the primary site of tumour cell lodgement. Dipyridamole and ancrod pretreatment did not influence the decrease of platelets and their accumulation in the lung after tumour cell injection. In contrast, heparin completely prevented the thrombocytopenia and the platelet trapping in the lung. From the present experiments it is concluded that embolic tumour cells lead to early endothelial damage, resulting in local thrombin formation with subsequent irreversible platelet aggregation.
机译:在向大鼠静脉内注射Walker 256肿瘤细胞后,血小板计数迅速下降,并在随后的观察期内保持较低水平。血小板减少与注射的细胞数量密切相关。动脉内肿瘤细胞注射需要相当高的肿瘤细胞数量才能产生可​​比的血小板减少症。不能存活的肿瘤细胞和肿瘤细胞碎片诱导了类似的循环血小板减少。活的肿瘤细胞或肿瘤细胞碎片均未在体外聚集大鼠血小板。在注射肿瘤细胞的动物中存在纤维蛋白单体提示血管内纤维蛋白沉积。然而,血浆纤维蛋白原水平并未显着降低。使用51Cr标记的血小板进行的同位素研究表明,血小板从循环中迅速消失,并被捕获在肺中(这是肿瘤细胞沉积的主要部位)。双嘧达莫和丙烯醛预处理不影响注射肿瘤细胞后血小板的减少及其在肺中的积累。相反,肝素完全防止血小板减少和血小板在肺中的捕获。从本实验得出结论,栓塞性肿瘤细胞导致早期内皮损伤,导致局部凝血酶形成,随后发生不可逆的血小板聚集。

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