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首页> 外文期刊>Infection and immunity >Release of β-Lysin from Platelets by Thrombin and by a Factor Produced in Heparinized Blood
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Release of β-Lysin from Platelets by Thrombin and by a Factor Produced in Heparinized Blood

机译:凝血酶和肝素化血液中产生的因子从血小板释放β-赖氨酸

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Removal of calcium by either citrate, oxalate, or ethylenediaminetetraacetate inhibited coagulation of blood at an early stage and prevented the release of β-lysin from platelets. In contrast, heparin caused platelet agglutination and stimulated β-lysin release in vitro and in vivo. This release was calcium dependent and may have been due to a calcium-dependent reaction in the blood coagulation sequence. Thrombin which by-passed the early calcium-dependent stages of coagulation directly stimulated the release of β-lysin from platelets. However, thrombin alone or in combination with other plasma factors was not as effective in releasing β-lysin as the regular coagulation process. Thrombin's platelet degranulating activity correlated with its β-lysin releasing activity. In contrast to thrombin, staphylococcal coagulase, which also by-passed the calcium-dependent stages of coagulation, coagulated citrated blood without releasing β-lysin. The release of β-lysin has been observed previously in the absence of blood coagulation, but this is the first observation of coagulation without β-lysin release. It is clear that β-lysin is released from platelets during coagulation by the direct action of thrombin and that it may be released in an earlier calcium-dependent reaction.
机译:柠檬酸盐,草酸盐或乙二胺四乙酸盐去除钙可在早期抑制血液凝结,并阻止血小板释放β-溶血素。相反,肝素在体外和体内引起血小板凝集并刺激β-溶血素释放。该释放是钙依赖性的,并且可能是由于血液凝固序列中钙依赖性的反应引起的。凝血酶绕过了钙的早期依赖凝结阶段,直接刺激了血小板释放β-溶血素。但是,单独的凝血酶或与其他血浆因子结合使用的凝血酶不能像常规凝血过程那样有效地释放β-溶素。凝血酶的血小板脱粒活性与其β-溶血素释放活性相关。与凝血酶相反,葡萄球菌凝固酶(也绕过了钙依赖性的凝固阶段)凝固了柠檬酸血而没有释放β-溶素。先前已经在没有凝血的情况下观察到了β-溶素的释放,但这是没有释放β-溶素的凝血的第一个观察结果。清楚的是,凝血酶的直接作用在凝结过程中会从血小板中释放出β-溶血素,并且它可能在较早的钙依赖性反应中释放。

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