Monocyte derived microvesicles deliver a cell death message via encapsulated caspase-1.

Monocyte derived microvesicles deliver a cell death message via encapsulated caspase-1.
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DOI:
10.1371/journal.pone.0007140
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发表时间:
2009-09-25
期刊:
影响因子:
3.7
通讯作者:
Wewers MD
Wewers MD
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Sarkar A;Mitra S;Mehta S;Raices R;Wewers MD

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细胞凋亡依赖于细胞内半胱天冬酶的活化,其典型地由内源性(基于线粒体的)或外源性(细胞因子)途径诱导。然而,在解释如何内毒素激活的单核细胞能够诱导血管平滑肌细胞的凋亡时,共培养的过程中,我们发现了一个跨细胞凋亡诱导途径,利用半胱天冬酶-1含有微泡。内毒素刺激的单核细胞诱导VSMC的细胞死亡,但是在这些单核细胞的无细胞上清液的100,000 g沉淀中发现了这种活性。该活性不是内毒素的直接作用,并且被半胱天冬酶-1抑制剂YVADcmk抑制,但不被Fas-L、IL-1β和IL-18抑制剂抑制。重要的是,如通过颗粒的TEM测定的,凋亡诱导活性与100 nm大小的微泡共纯化。这些微囊泡含有半胱天冬酶-1,并且需要半胱天冬酶-1包封,因为微囊泡完整性的破坏破坏了凋亡活性而不是半胱天冬酶-1酶活性。因此,单核细胞能够传递细胞死亡信息,这取决于含有功能性半胱天冬酶-1的微泡的释放。这种跨细胞凋亡诱导途径描述了炎症诱导的程序性细胞死亡的新途径。
Apoptosis depends upon the activation of intracellular caspases which are classically induced by either an intrinsic (mitochondrial based) or extrinsic (cytokine) pathway. However, in the process of explaining how endotoxin activated monocytes are able to induce apoptosis of vascular smooth muscle cells when co-cultured, we uncovered a transcellular apoptosis inducing pathway that utilizes caspase-1 containing microvesicles. Endotoxin stimulated monocytes induce the cell death of VSMCs but this activity is found in 100,000 g pellets of cell free supernatants of these monocytes. This activity is not a direct effect of endotoxin, and is inhibited by the caspase-1 inhibitor YVADcmk but not by inhibitors of Fas-L, IL-1β and IL-18. Importantly, the apoptosis inducing activity co-purifies with 100 nm sized microvesicles as determined by TEM of the pellets. These microvesicles contain caspase-1 and caspase-1 encapsulation is required since disruption of microvesicular integrity destroys the apoptotic activity but not the caspase-1 enzymatic activity. Thus, monocytes are capable of delivering a cell death message which depends upon the release of microvesicles containing functional caspase-1. This transcellular apoptosis induction pathway describes a novel pathway for inflammation induced programmed cell death.
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