Phagocytosis triggers macrophage release of Fas ligand and induces apoptosis of bystander leukocytes.

Phagocytosis triggers macrophage release of Fas ligand and induces apoptosis of bystander leukocytes.
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吞噬作用触发巨噬细胞释放 Fas 配体并诱导旁观者白细胞凋亡。

DOI:
10.4049/jimmunol.162.1.480
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发表时间:
1999
影响因子:
4.4
通讯作者:
John Savill
John Savill
中科院分区:
医学2区
文献类型:
--
作者:
Simon B. Brown;John Savill

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人单核/巨噬细胞(Mphi)在非颗粒性刺激下可表达细胞表面Fas配体(FasL)并释放活性可溶性FasL(sFasL)。我们现在报道,单核细胞/Mphi-inglutamine调理酵母聚糖释放sFasL和条件上清液,使这些触发Fas介导的凋亡的“旁观者”单核细胞和FasL阴性中性粒细胞。此外,相同的结果被认为是与Mphi采取凋亡的中性粒细胞,而介质条件Mphi吞噬乳胶珠后,中性粒细胞没有促凋亡的影响,尽管存在sFasL。这些数据表明,迄今尚未认识到的反馈回路的存在,需要可溶性因子,除了sFasL,可能会促进炎症的解决-吞噬清除凋亡细胞,导致Fas介导的杀死旁观者白细胞的吞噬巨噬细胞。
Human monocyte/macrophages (Mphi) exposed to nonparticulate stimuli can express cell surface Fas ligand (FasL) and release active soluble FasL (sFasL). We now report that monocyte/Mphi-ingesting opsonized zymosan released sFasL and conditioned supernatants so that these triggered Fas-mediated apoptosis of "bystander" monocytes and FasL-negative neutrophils. Furthermore, identical results were seen with Mphi taking up apoptotic neutrophils, whereas medium conditioned by Mphi phagocytizing latex beads had no proapoptotic effects upon neutrophils despite the presence of sFasL. These data suggest the hitherto unrecognized existence of a feedback loop requiring soluble factors in addition to sFasL that may promote resolution of inflammation-phagocytic clearance of apoptotic cells leading to Fas-mediated killing of bystander leukocytes by phagocytizing macrophages.
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