Ultraviolet (UV) and hydrogen peroxide activate ceramide-ER stress-AMPK signaling axis to promote retinal pigment epithelium (RPE) cell apoptosis.

Ultraviolet (UV) and hydrogen peroxide activate ceramide-ER stress-AMPK signaling axis to promote retinal pigment epithelium (RPE) cell apoptosis.
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DOI:
10.3390/ijms140510355
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发表时间:
2013-05-17
影响因子:
5.6
通讯作者:
Jiang Q
Jiang Q
中科院分区:
生物学2区
文献类型:
--
作者:
Yao J;Bi HE;Sheng Y;Cheng LB;Wendu RL;Wang CH;Cao GF;Jiang Q

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紫外线(UV)辐射和活性氧(ROS)通过诱导细胞凋亡损害视网膜色素上皮(RPE)细胞的生理功能,是导致老年性黄斑变性(AMD)的主要原因。UV/ROS诱导RPE细胞死亡的机制尚未完全阐明。在这里,我们观察到激活的神经酰胺内质网(ER)的压力AMP激活的蛋白激酶(AMPK)信号轴在UV和过氧化氢(H2 O2)处理的RPE细胞。UV和H_2O_2诱导早期神经酰胺的产生,深刻的ER应激和AMPK激活。针对ER应激(salubrinal)、神经酰胺产生(伏马菌素B1)和AMPK激活(化合物C)的药理学抑制剂抑制了UV和H2 O2诱导的RPE细胞凋亡。相反,细胞渗透性短链C6神经酰胺和AMPK激活剂AICAR(5-氨基-1-β-D-呋喃核糖基-咪唑-4-甲酰胺)模拟UV和H2 O2的作用,并促进RPE细胞凋亡。总之,这些结果表明,UV/H2 O2激活神经酰胺-ER应激-AMPK信号转导轴,以促进RPE细胞凋亡。
Ultraviolet (UV) radiation and reactive oxygen species (ROS) impair the physiological functions of retinal pigment epithelium (RPE) cells by inducing cell apoptosis, which is the main cause of age-related macular degeneration (AMD). The mechanism by which UV/ROS induces RPE cell death is not fully addressed. Here, we observed the activation of a ceramide-endoplasmic reticulum (ER) stress-AMP activated protein kinase (AMPK) signaling axis in UV and hydrogen peroxide (H2O2)-treated RPE cells. UV and H2O2 induced an early ceramide production, profound ER stress and AMPK activation. Pharmacological inhibitors against ER stress (salubrinal), ceramide production (fumonisin B1) and AMPK activation (compound C) suppressed UV- and H2O2-induced RPE cell apoptosis. Conversely, cell permeable short-chain C6 ceramide and AMPK activator AICAR (5-amino-1-β-D-ribofuranosyl-imidazole-4-carboxamide) mimicked UV and H2O2’s effects and promoted RPE cell apoptosis. Together, these results suggest that UV/H2O2 activates the ceramide-ER stress-AMPK signaling axis to promote RPE cell apoptosis.
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