Caspase-8 as a regulator of tumor cell motility.

Caspase-8 as a regulator of tumor cell motility.
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DOI:
10.2174/1566524014666140128111951
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发表时间:
2014-02
影响因子:
2.5
通讯作者:
Stupack D
Stupack D
中科院分区:
医学4区
文献类型:
--
作者:
Graf RP;Keller N;Barbero S;Stupack D

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半胱天冬酶是一个广泛表达的半胱氨酸蛋白酶家族,以其在程序性细胞死亡中的作用而闻名。然而,半胱天冬酶在脊椎动物中发挥许多其他作用。在半胱天冬酶-8的情况下,表达的丧失是胚胎致死表型,并且半胱天冬酶-8在抑制细胞坏死、促进分化和免疫信号传导、调节自噬和促进细胞迁移中起作用。细胞凋亡和迁移需要caspase-8在细胞周围的定位,其中caspase-8作为不同的生物感觉复合物的一部分,其在适当的细胞微环境中促进迁移,或在不适当的环境中促进细胞死亡。在细胞外围,半胱天冬酶-8以酪氨酸激酶依赖性方式与粘着斑复合物的组分相互作用,促进体外细胞迁移和体内转移。在机制上,半胱天冬酶-8与粘着斑和早期内体的组分相互作用,增强粘着斑周转并促进整合素快速再循环至细胞表面。在临床上,这表明caspase-8的表达可能并不总是一个积极的预后标志,caspase-8在癌症进展中的作用可能是依赖于环境的。
The caspases are a family of ubiquitously expressed cysteine proteases best known for their roles in programmed cell death. However, caspases play a number of other roles in vertebrates. In the case of caspase-8, loss of expression is an embryonic lethal phenotype, and caspase-8 plays roles in suppressing cellular necrosis, promoting differentiation and immune signaling, regulating autophagy, and promoting cellular migration. Apoptosis and migration require localization of caspase-8 in the periphery of the cells, where caspase-8 acts as part of distinct biosensory complexes that either promote migration in appropriate cellular microenvironments, or cell death in inappropriate settings. In the cellular periphery, caspase-8 interacts with components of the focal adhesion complex in a tyrosine-kinase dependent manner, promoting both cell migration in vitro and metastasis in vivo. Mechanistically, caspase-8 interacts with components of both focal adhesions and early endosomes, enhancing focal adhesion turnover and promoting rapid integrin recycling to the cell surface. Clinically, this suggests that the expression of caspase-8 may not always be a positive prognostic sign, and that the role of caspase-8 in cancer progression is likely context-dependent.
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