DNA-dependent protein kinase is one of a subset of autoantigens specifically cleaved early during apoptosis.

DNA-dependent protein kinase is one of a subset of autoantigens specifically cleaved early during apoptosis.
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DOI:
10.1084/jem.182.6.1625
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发表时间:
1995-12-01
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Rosen A
Rosen A
中科院分区:
其他
文献类型:
--
作者:
Casciola-Rosen LA;Anhalt GJ;Rosen A

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关键底物的蛋白水解裂解似乎是细胞凋亡过程的重要生化机制,并且白细胞介素1 β转换酶(ICE)样蛋白酶作为细胞凋亡介质的中心地位已被提出。因此,在细胞凋亡过程中识别ICE蛋白酶家族的相关底物构成了一个重大挑战。使用人类自身抗体,我们在这里证明了自身抗原的一个子集在细胞凋亡的早期被特异性地切割。其中一个裂解分子被鉴定为dna依赖性蛋白激酶的催化亚基。所有蛋白水解裂解的时间过程是相同的,并与形态学凋亡的开始一致。此外,所有的裂解都具有相同的抑制特性,这暗示了一种类似ice的活性(ies)。我们提出,这些自身抗原的切割目标这些分子的自身免疫反应通过揭示免疫隐片段在前免疫细胞凋亡设置。对这些片段的免疫原性的研究可能会对分子的自身免疫靶向产生深刻的见解。此外,所描述的自身抗体将是阐明凋亡途径中重要的蛋白水解机制的有价值的工具。
Proteolytic cleavage of key substrates appears to be an important biochemical mechanism underlying the apoptotic process, and the centrality of interleukin 1 beta-converting enzyme (ICE)-like proteases as mediators of apoptosis has been suggested. The identification of the relevant substrates of the ICE protease family during apoptosis therefore constitutes a major challenge. Using human autoantibodies, we demonstrate here that a subset of autoantigens is specifically cleaved early during apoptosis. One of these cleaved molecules is identified as the catalytic subunit of the DNA-dependent protein kinase. The time courses of all proteolytic cleavages are identical and coincide with the onset of morphologic apoptosis. Furthermore, all cleavages share the same inhibition characteristics, which implicate an ICE-like activity(ies). We propose that cleavage of these autoantigens targets these molecules for an autoimmune response by revealing immunocryptic fragments in a proimmune apoptotic setting. Study of the immunogenicity of these fragments may yield insights into the autoimmune targeting of molecules. Moreover, the autoantibodies described will be valuable tools for the elucidation of mechanistically important proteolytic steps along the apoptotic pathway.
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发表时间: 1993-02-01
期刊: The Journal of experimental medicine
影响因子: --
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发表时间: 1995-06-01
期刊: The Journal of experimental medicine
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