DJ-1 缺乏和衰老:视网膜线粒体功能障碍的双重驱动因素
bioRxiv : the preprint server for biology
|June 6, 2025
概括
缺少DJ-1蛋白质会损害线粒体功能,并增加视网膜和视网膜色素上皮质 (RPE) 中的氧化应激. 这项研究突出了DJ-1的特点.
科学领域:
- 线粒体生物学 线粒体生物学
- 神经科学是一个神经科学.
- 眼科医生 眼科 眼科
- 衰老的研究研究.
背景情况:
- 众所周知,DJ-1蛋白调节氧化应激,特别是在视网膜和RPE中.
- DJ-1转移到线粒体以清除活性氧物种 (ROS),但其在衰老和氧化应激引起的线粒体功能障碍中的作用需要进一步调查.
研究的目的:
- 研究DJ-1缺乏对线粒体功能和老化视网膜和RPE中的氧化应激的影响.
- 为了分析线粒体DNA (mtDNA) 完整性,含量和关键线粒体蛋白质表达的变化,与野生类型 (WT) 对照相比,在DJ-1淘汰赛 (KO) 小鼠中.
主要方法:
- 使用海马分析对活细胞新陈代谢进行实体视网膜冲击的分析.
- 从3个月和15个月大的DJ-1 WT和DJ-1 KO小鼠的RPE和视网膜中分离DNA和蛋白质.
- 量化mtDNA损伤和含量,为OXPHOS复合体和相关蛋白质进行西部涂抹 (POLG,OGG1,SOD2,PGC1α).
主要成果:
- DJ-1 KO小鼠在视网膜和RPE中显著降低了氧气消耗率 (OCR).
- 在DJ-1KO小鼠中观察到线粒体OXPHOS复合体子单元的降低水平,与年龄相关的影响.
- 在DJ-1 KO RPE和视网膜中观察到mtDNA含量增加和病变,以及改变的PGC1α和POLG水平,表明线粒体功能障碍.
结论:
- DJ-1在维护视网膜和RPE中的线粒体调节和功能方面发挥着至关重要的作用.
- 缺少DJ-1导致线粒体功能障碍,其特征是能量代谢受损,mtDNA损伤增加和蛋白质表达改变.
- 这些发现强调了DJ-1在保护与年龄相关的氧化应激和眼组织中线粒体衰退方面的重要性.
相关概念视频
Mitochondria
15.2K
Mitochondria are eukaryotic cellular organelles that are known to produce energy through a process called oxidative phosphorylation. Besides their primary function, mitochondria are involved in various cellular processes, including cell growth, differentiation, signaling, metabolism, and senescence. Age-related changes cause a decline in mitochondrial quality and integrity due to increased mitochondrial mutations and oxidative damage. Thus, aging can severely impact mitochondrial functions,...
15.2K
Electron Transport Chain: Complex I and II
15.1K
The mitochondrial electron transport chain (ETC) is the main energy generation system in the eukaryotic cells. However, mitochondria also produce cytotoxic reactive oxygen species (ROS) due to the large electron flow during oxidative phosphorylation. While Complex I is one of the primary sources of superoxide radicals, ROS production by Complex II is uncommon and may only be observed in cancer cells with mutated complexes.
ROS generation is regulated and maintained at moderate levels necessary...
ROS generation is regulated and maintained at moderate levels necessary...
15.1K
Mitochondrial Membranes
12.5K
A single mitochondrion is a bean-shaped organelle enclosed by a double-membrane system. The outer membrane of mitochondria is smooth and contains many porins - the integral membrane transporters. Porins enable free diffusion of ions and small uncharged molecules through the outer mitochondrial membrane but limit the transport of molecules larger than 5000 Daltons. Further, the outer mitochondrial membrane forms a unique structure called membrane contact sites with other subcellular organelles,...
12.5K
The Effect of Aging on Tissues
2.6K
Several body functions deteriorate with age. The external signs of aging are easily identifiable. For example, the skin becomes dry, less elastic, and thins out, forming wrinkles. The skin of the face begins to appear looser due to a decrease in the levels of elastic and collagen fibers in the connective tissue. Additionally, melanin production in the hair follicle decreases with age, resulting in gray hair. Moreover, the senses of sight and hearing decline, so glasses and hearing aids may...
2.6K


