失去UCP2会导致线粒体的碎片化,因为OPA1的OMA1依赖的蛋白质分解过程会导致Podocytes中的OPA1碎片化
Qianqian Yang1, Lulu Wang2, Yuehong Liang2
1Division of Nephrology, The Affiliated Huaian No.1 People's Hospital of Nanjing Medical University, Huaian, Jiangsu, China.
概括
在 podocytes 中缺乏解蛋白 2 (UCP2) 的小鼠会发展脏疾病和蛋白尿症. UCP2对于维护线粒体平衡,防止裂变和确保 podocytes 中 ATP 生产至关重要.
科学领域:
- 腎臟病學 (nephrology) 是一種醫學.
- 线粒体生物学 线粒体生物学
- 细胞生物学 细胞生物学
背景情况:
- 线粒体功能障碍与细胞损伤和蛋白尿有关.
- 细胞中线粒体变化的具体机制尚不清楚.
- 分离蛋白2 (UCP2) 是一种线粒体内膜蛋白.
研究的目的:
- 研究UCP2在细胞线粒体动态中的作用及其对蛋白尿的贡献.
- 阐明将UCP2与Podocytes中的线粒体功能联系起来的分子机制.
主要方法:
- 产生 podocyte 特定的 Ucp2 缺乏的小鼠.
- 在老化和阿德里亚米辛诱导模型中评估蛋白尿和 podocyte 损伤.
- 分析 mitochondrial 动力学 (裂变/融合),ATP 生产和 podocytes 中的关键蛋白质表达 (OPA1, OMA1).
主要成果:
- 足细胞特异性Ucp2缺乏导致了年龄相关的足细胞病变和蛋白尿.
- 在阿德里亚米辛模型中,UCp2被删除的小鼠显示出加剧的蛋白尿症.
- Ucp2 缺乏导致线粒体裂变增加,ATP 生产减少,并通过 OMA1 激活在 podocytes 中通过 OPA1 蛋白质分解.
结论:
- UCP2在调节细胞内的线粒体动力学方面发挥着至关重要的作用.
- 缺乏UCP2会破坏线粒体平衡,导致细胞损伤和蛋白尿.
- 准UCP2可能为蛋白尿性脏疾病提供一种新的治疗策略.
相关概念视频
01:13The Proteasome
857
Eukaryotic cells can degrade proteins through several pathways. One of the most important among these is the ubiquitin-proteasome pathway. It helps the cell eliminate the misfolded, damaged, or unwarranted cytoplasmic proteins in a highly specific manner.
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. This involves participation of a series of enzymes including— E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3...
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. This involves participation of a series of enzymes including— E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3...
857
01:39Mitochondrial Precursor Proteins
2.6K
Mitochondrial precursors are partially unfolded or loosely folded polypeptide chains. Newly synthesized precursors are inhibited from spontaneously folding into their native conformation by the cytosolic chaperones, heat shock proteins 70 (Hsp70), and mitochondrial import stimulation factors (MSFs). Precursors bound to MSFs are guided to the TOM70-TOM37 receptors, while precursors bound to Hsp70 chaperones are targetted to TOM20-TOM22 receptor complexes.
Most of the mitochondrial...
Most of the mitochondrial...
2.6K
01:19Translocation of Proteins into the Mitochondria
3.1K
Mitochondrial precursors are translocated to the internal subcompartments via independent mechanisms involving distinct protein machineries called translocases.
Sorting of outer membrane proteins:
Mitochondrial outer membrane proteins are of two types: the transmembrane, beta-barrel porins, and the membrane-anchored, alpha-helical proteins. Beta-barrel porin precursors are translocated by the TOM complex and inserted into the outer mitochondrial membrane by the SAM complex. In contrast,...
Sorting of outer membrane proteins:
Mitochondrial outer membrane proteins are of two types: the transmembrane, beta-barrel porins, and the membrane-anchored, alpha-helical proteins. Beta-barrel porin precursors are translocated by the TOM complex and inserted into the outer mitochondrial membrane by the SAM complex. In contrast,...
3.1K
01:37The Unfolded Protein Response
4.7K
The ER is the hub of protein synthesis in a cell. It has robust systems to quality control protein folding and also for degradation of terminally misfolded proteins. Under normal conditions, a small proportion of misfolded proteins that cannot be salvaged need to be transported to the cytoplasm by the ER-associated degradation or ERAD pathways. However, if the ERAD cannot handle the misfolded proteins, the cell activates the unfolded protein response or UPR to adjust the protein folding...
4.7K
01:39Mitochondrial Protein Sorting
4.3K
Mitochondria are double-membrane organelles of the eukaryotes involved in cellular metabolism, signaling, ATP synthesis, and programmed cell death. Each of these processes requires specific proteins and enzymes that must be correctly sorted to the right mitochondrial subcompartment for the proper functioning of the organelle.
Most of these mitochondrial proteins are encoded by the nucleus and imported to the mitochondria as unfolded or loosely folded precursors. Mitochondrial precursors...
Most of these mitochondrial proteins are encoded by the nucleus and imported to the mitochondria as unfolded or loosely folded precursors. Mitochondrial precursors...
4.3K
01:31The Intrinsic Apoptotic Pathway
6.6K
Internal cellular stress, such as cellular injury or hypoxia, triggers intrinsic apoptosis. The B-cell lymphoma 2 (Bcl-2) family of proteins are the primary regulators of the intrinsic apoptotic pathway. For example, during DNA damage, checkpoint proteins, such as Ataxia Telangiectasia Mutated (ATM protein) and Checkpoints Factor-2 (Chk2) proteins, are activated. These proteins phosphorylate p53 which further activates pro-apoptotic proteins, such as Bax, Bak, PUMA, and Noxa, and inhibits...
6.6K