Dual involvement of caspase-4 in inflammatory and ER stress-induced apoptotic responses in human retinal pigment epithelial cells.

Dual involvement of caspase-4 in inflammatory and ER stress-induced apoptotic responses in human retinal pigment epithelial cells.
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DOI:
10.1167/iovs.09-3628
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发表时间:
2009-12
影响因子:
4.4
通讯作者:
Elner VM
Elner VM
中科院分区:
医学2区
文献类型:
--
作者:
Bian ZM;Elner SG;Elner VM

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研究 caspase-4 在人视网膜色素上皮 (hRPE) 细胞中的功能参与。在用促炎剂 IL-1β (2 ng/ml)、TNF-α (20 ng/ml)、脂多糖 (1000 ng/ml)、γ-干扰素 (500 U/ml) 刺激后,测量 hRPE 细胞中 caspase-4 的表达和激活,或在不存在或存在免疫调节剂环孢素(3 或 30 ng/ml)、地塞米松的情况下进行单核细胞共培养。 (10 μM) 或 IL-10 (100 U/ml),以及内质网 (ER) 应激诱导剂毒胡萝卜素 (25 nM) 或衣霉素 (3 或 10 μM)。 ER 应激的发生由 GRP78 的表达决定。通过用 caspase-4 抑制剂 ZLEVD-fmk、caspase-1 和 -4 抑制剂 Z-YVAD-fmk 和泛 caspase 抑制剂 Z-VAD-fmk 处理细胞,进一步检查 caspase-4 在炎症和细胞凋亡中的参与。本研究中测试的所有促炎剂和 ER 应激诱导剂均可诱导 Caspase-4 mRNA 表达和蛋白激活。 Caspase-4 的激活被地塞米松和 IL-10 阻断或减少。 ER 应激标记物 GRP78 表达增加表明促炎剂和 ER 应激诱导剂导致 ER 应激升高。 caspase-4 抑制剂 Z-LEVD-fmk 显着降低衣霉素诱导的 caspase-4 和 caspase-3 活性以及 IL-1β 刺激的 IL-8 蛋白表达。 caspase-4 抑制剂 Z-LEVD-fmk 和 caspase-1 和 -4 抑制剂 Z-YVAD-fmk 分别将衣霉素诱导的 hRPE 凋亡细胞死亡减少 59% 和 86%,而泛 caspase 抑制剂 Z-VAD-fmk 完全消除诱导的细胞凋亡。 Caspase-4 双重参与 hRPE 促炎症和促凋亡反应。各种促炎刺激和内质网应激诱导 hRPE caspase-4 mRNA 合成和蛋白质激活。 ER 应激诱导的 hRPE 细胞死亡是 caspase 依赖性的,部分是 caspase-4 依赖性的。
To investigate the functional involvement of caspase-4 in human retinal pigment epithelial (hRPE) cells. Expression and activation of caspase-4 in hRPE cells were measured after stimulation with pro-inflammatory agents IL-1β (2 ng/ml), TNF-α (20 ng/ml), lipopolysaccharide (1000 ng/ml), γ-interferon (500 U/ml), or monocyte co-culture in the absence or presence of immunomodulating agents cyclosporine (3 or 30ng/ml), dexamethasone (10 μM), or IL-10 (100 U/ml), as well as endoplasmic reticulum (ER) stress inducers thapsigargin (25 nM) or tunicamycin (3 or 10 μM). The onset of ER stress was determined by expression of GRP78. The Involvement of caspase-4 in inflammation and apoptosis was further examined by treating the cells with caspase-4 inhibitor ZLEVD-fmk, caspase-1 and -4 inhibitor Z-YVAD-fmk and pan-caspase inhibitor Z-VAD-fmk. Caspase-4 mRNA expression and protein activation were induced by all the pro-inflammatory agents and ER stress inducers tested in this study. Caspase-4 activation was blocked or reduced by dexamethasone, and IL-10. Elevated ER stress by pro-inflammatory agents and ER stress inducers was shown by increased expression of the ER stress marker GRP78. The induced caspase-4 and caspase-3 activities by tunicamycin, and the stimulated IL-8 protein expression by IL-1β were markedly reduced by caspase-4 inhibitor Z-LEVD-fmk. While caspase-4 inhibitor Z-LEVD-fmk and caspase-1 and -4 inhibitor Z-YVAD-fmk reduced tunicamycin-induced hRPE apoptotic cell death by 59 and 86%, respectively, pan-caspase inhibitor Z-VAD-fmk completely abolished the induced apoptosis. Caspase-4 is dually involved in hRPE pro-inflammatory and proapoptotic responses. Various pro-inflammatory stimuli and ER stress induce hRPE caspase-4 mRNA synthesis and protein activation. The ER stress-induced hRPE cell death is caspase- and, in part, caspase-4-dependent.
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影响因子: 7.8
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发表时间: 2003-05-01
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