Repressed SIRT1/PGC-1α pathway and mitochondrial disintegration in iPSC-derived RPE disease model of age-related macular degeneration

被引:101
作者
Golestaneh, Nady [1 ,2 ,3 ]
Chu, Yi [1 ]
Cheng, Shuk Kei [1 ]
Cao, Hong [1 ]
Poliakov, Eugenia [4 ]
Berinstein, Daniel M. [5 ]
机构
[1] Georgetown Univ, Med Ctr, Dept Ophthalmol, 3900 Reservoir Rd NW,Med Dent Bldg,Room NE203, Washington, DC 20057 USA
[2] Georgetown Univ, Med Ctr, Dept Neurol, Washington, DC 20007 USA
[3] Georgetown Univ, Med Ctr, Dept Biochem & Mol & Cellular Biol, Washington, DC 20007 USA
[4] NEI, Retinal Cell & Mol Biol LRCMB, NIH, Bethesda, MD 20892 USA
[5] Retina Grp Washington, Chevy Chase, MD 20815 USA
关键词
AMD; RPE; Oxidative stress; Mitochondria; Cell viability; ROS; PGC-1; alpha; SIRT1; PLURIPOTENT STEM-CELLS; RETINAL-PIGMENT EPITHELIUM; OXIDATIVE STRESS; ENERGY-EXPENDITURE; DIRECT PHOSPHORYLATION; EPIGENETIC MEMORY; SKELETAL-MUSCLE; ARPE-19; CELLS; PGC-1-ALPHA; AMPK;
D O I
10.1186/s12967-016-1101-8
中图分类号
R-3 [医学研究方法]; R3 [基础医学];
学科分类号
1001 ;
摘要
Background: Study of age related macular degeneration (AMD) has been hampered by lack of human models that represent the complexity of the disease. Here we have developed a human in vitro disease model of AMD to investigate the underlying AMD disease mechanisms. Methods: Generation of iPSCs from retinal pigment epithelium (RPE) of AMD donors, age-matched normal donors, skin fibroblasts of a dry AMD patient, and differentiation of iPSCs into RPE (AMD RPE-iPSC-RPE, normal RPE-iPSC-RPE and AMD Skin-iPSC-RPE, respectively). Immunostaining, cell viability assay and reactive oxygen species (ROS) production under oxidative stress conditions, electron microscopy (EM) imaging, ATP production and glycogen concentration assays, quantitative real time PCR, western blot, karyotyping. Results: The AMD RPE-iPSC-RPE and AMD Skin-iPSC-RPE present functional impairment and exhibit distinct disease phenotypes compared to RPE-iPSC-RPE generated from normal donors (Normal RPE-iPSC-RPE). The AMD RPE-iPSC-RPE and AMD Skin-iPSC-RPE show increased susceptibility to oxidative stress and produced higher levels of reactive oxygen species (ROS) under stress in accordance with recent reports. The susceptibility to oxidative stress-induced cell death in AMD RPE-iPSC-RPE and Skin-iPSC-RPE was consistent with inability of the AMD RPE-iPSC-RPE and Skin-iPSC-RPE to increase SOD2 expression under oxidative stress. Phenotypic analysis revealed disintegrated mitochondria, accumulation of autophagosomes and lipid droplets in AMD RPE-iPSC-RPE and AMD Skin-iPSC-RPE. Mitochondrial activity was significantly lower in AMD RPE-iPSC-RPE and AMD Skin-iPSC-RPE compared to normal cells and glycogen concentration was significantly increased in the diseased cells. Furthermore, Peroxisome proliferator-activated receptor gamma coactivator 1-alpha (PGC-1 alpha), a regulator of mitochondrial biogenesis and function was repressed, and lower expression levels of NAD-dependent deacetylase sirtuin1 (SIRT1) were found in AMD RPE-iPSC-RPE and AMD Skin-iPSC-RPE as compared to normal RPE-iPSC-RPE. Conclusions: Our studies suggest SIRT1/PGC-1 alpha as underlying pathways contributing to AMD pathophysiology, and open new avenues for development of targeted drugs for treatment of this devastating neurodegenerative disease of the visual system.
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页数:17
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