Caspase-11 promotes the fusion of phagosomes harboring pathogenic bacteria with lysosomes by modulating actin polymerization.

Caspase-11 promotes the fusion of phagosomes harboring pathogenic bacteria with lysosomes by modulating actin polymerization.
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DOI:
10.1016/j.immuni.2012.05.001
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发表时间:
2012-07-27
期刊:
影响因子:
32.4
通讯作者:
Amer AO
Amer AO
中科院分区:
医学1区
文献类型:
--
作者:
Akhter A;Caution K;Abu Khweek A;Tazi M;Abdulrahman BA;Abdelaziz DH;Voss OH;Doseff AI;Hassan H;Azad AK;Schlesinger LS;Wewers MD;Gavrilin MA;Amer AO

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炎性小体是一种多蛋白复合体,包括NLR(富含亮氨酸的重复序列)家族成员和caspase-1。一旦细菌分子在巨噬细胞内被感觉到,炎症体就被组装起来,介导caspase-1的激活。Caspase-11介导内毒素和细菌毒素对caspase-1的激活。然而,它在细菌感染中的作用尚不清楚。在这里,我们证明了caspase-11对于军团菌、沙门氏菌、方济氏菌和李斯特菌的caspase-1的激活是必不可少的。我们还确定了抑制嗜肺乳杆菌感染需要有活性的小鼠caspase-11。类似地,人caspase-4和5,小鼠caspase-11的同源物,合作限制嗜肺乳杆菌在人巨噬细胞中的感染。Caspase-11通过cofilin调节肌动蛋白聚合,促进嗜肺乳杆菌空泡与溶酶体的融合。然而,caspase-11对于溶酶体与含有非致病细菌的吞噬体的融合是必不可少的,揭示了吞噬体根据货物运输的根本不同。
Inflammasomes are multiprotein complexes that include members of the NLR (nucleotide-binding domain leucine-rich repeat containing) family and caspase-1. Once bacterial molecules are sensed within the macrophage, the inflammasome is assembled mediating the activation of caspase-1. Caspase-11 mediates caspase-1 activation in response to lipopolysaccharide and bacterial toxins. Yet, its role during bacterial infection is unknown. Here, we demonstrated that caspase-11 was dispensable for caspase-1 activation in response to Legionella, Salmonella, Francisella and Listeria. We also determined that active mouse caspase-11 was required for restriction of L. pneumophila infection. Similarly, human caspase-4 and 5, homologs of mouse caspase-11, cooperated to restrict L. pneumophila infection in human macrophages. Caspase-11 promoted the fusion of the L. pneumophila- vacuole with lysosomes by modulating actin polymerization through cofilin. However, caspase-11 was dispensable for the fusion of lysosomes with phagosomes containing non-pathogenic bacteria, uncovering a fundamental difference in the trafficking of phagosomes according to their cargo.
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