Cytoplasmic LPS activates caspase-11: implications in TLR4-independent endotoxic shock.

Cytoplasmic LPS activates caspase-11: implications in TLR4-independent endotoxic shock.
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DOI:
10.1126/science.1240988
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发表时间:
2013-09-13
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Miao EA
Miao EA
中科院分区:
其他
文献类型:
--
作者:
Hagar JA;Powell DA;Aachoui Y;Ernst RK;Miao EA

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炎性半胱天冬酶,如半胱天冬酶-1和-11,介导病原体的先天免疫检测。胱天蛋白酶-11诱导细胞凋亡,一种程序性细胞死亡的形式,并特异性防御侵入细胞质的细菌病原体。然而,在内毒素血症期间,过度的caspase-11活化引起休克。我们报告,脂多糖(LPS)污染的细胞质是触发caspase-11在小鼠中激活的信号。具体而言,胱天蛋白酶-11响应于五酰化和六酰化脂质A,而四酰化脂质A未被检测到,提供了逃避胞质侵入弗朗西斯菌的机制。在野生型和Tlr 4缺陷型小鼠中引发caspase-11通路导致对随后的LPS攻击的极端敏感性,而caspase 11缺陷型小鼠相对具有抗性。总之,我们的数据揭示了一种检测细胞质LPS的新途径。
Inflammatory caspases, such as caspase-1 and -11, mediate innate immune detection of pathogens. Caspase-11 induces pyroptosis, a form of programmed cell death, and specifically defends against bacterial pathogens that invade the cytosol. During endotoxemia, however, excessive caspase-11 activation causes shock. We report that contamination of the cytoplasm by lipopolysaccharide (LPS) is the signal that triggers caspase-11 activation in mice. Specifically, caspase-11 responds to penta- and hexa-acylated lipid A, whereas tetra-acylated lipid A is not detected, providing a mechanism of evasion for cytosol-invasive Francisella. Priming the caspase-11 pathway in vivo resulted in extreme sensitivity to subsequent LPS challenge in both wild type and Tlr4-deficient mice, whereas caspase 11-deficient mice were relatively resistant. Together, our data reveal a new pathway for detecting cytoplasmic LPS.
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