Why human platelets fail to kill bacteria

Why human platelets fail to kill bacteria
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为什么人体血小板不能杀死细菌

DOI:
10.1080/09537100500441234
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发表时间:
2006
期刊:
影响因子:
3.3
通讯作者:
J. White
J. White
中科院分区:
医学3区
文献类型:
--
作者:
J. White

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最近的研究表明,血小板吸收细菌的方式与多形核 (PMN) 白细胞和单核细胞吸收的方式相同。含有生物体的吞噬液泡与细胞外部和细胞质完全分离,以形成杀伤室。然而,早期的研究表明血小板不能杀死细菌。目前的工作为血小板杀菌活性的缺乏提供了依据。血小板与金黄色葡萄球菌 502A 或 RN 450 一起孵育长达 2 小时,可以将生物体吸收到隔离液泡中,该液泡类似于 PMN 和单核细胞形成的吞噬体。然而,用与锇酸形成电子致密染色的单宁酸染色表明,PMN和单核细胞中的吞噬体与细胞外部和细胞质完全分离。因此,它们是真正的杀人室。另一方面,血小板中含有细菌的吞噬液泡几乎从未与细胞外部密封。锇黑反应产物会染色吞噬液泡的内部以及将其连接到细胞外部的开放小管系统的通道。因此,血小板不会形成在白细胞中观察到的杀伤室吞噬体,因此不能杀死细菌。
Recent investigations have suggested that bacteria are taken up by platelets in the same manner as by polymorphonuclear (PMN) leukocytes and monocytes. The phagocytic vacuole containing the organism is completely separated from the cell exterior and the cytoplasm in order to form a killing chamber. Yet, earlier studies demonstrated that platelets do not kill bacteria. The present work has provided a basis for the lack of platelet bactericidal activity. Platelets incubated with Staphylococcus aureus 502A or RN 450 for intervals up to 2 h can take up organisms into sequestration vacuoles that resemble the phagosomes formed by PMN and monocytes. However, staining with tannic acid which forms an electron dense stain with osmic acid reveals that the phagosomes in PMN and monocytes are completely separated from the cell exterior and the cytoplasm. As a result, they are true killing chambers. The engulfment vacuoles containing bacteria in platelets on the other hand are almost never sealed from the cell exterior. Osmium black reaction product stains the inside of the engulfment vacuole and channels of the open canalicular system connecting it to the cell exterior. Thus platelets do not form the killing chamber phagosomes observed in leukocytes and, as a result, cannot kill bacteria.
小乳胶颗粒摄取对血小板表面连接小管系统的影响:冷冻断裂和细胞化学研究。
DOI: --
发表时间: 1982
影响因子: --
作者:
White,JG;Clawson,CC
通讯作者: Clawson,CC
DOI: 10.3109/01913128009140561
发表时间: 1980-10
影响因子: 1
作者:
James G. White;C. Clawson
通讯作者: James G. White;C. Clawson
表面和悬浮激活血小板中开放小管系统的命运。
DOI: --
发表时间: 1989
期刊: Blood
影响因子: 20.3
作者:
Escolar,G;Leistikow,E;White,JG
通讯作者: White,JG
DOI: --
发表时间: 1980
期刊: The American journal of pathology
影响因子: --
作者:
White,JG;Clawson,CC
通讯作者: Clawson,CC