败血症的分子基础:对线粒体DNA作为损伤相关的分子模式的作用的新见解
Bushra1, Shaik Iqbal Ahmed1, Safia Begum1
1Central Laboratory for Stem Cell Research and Translational Medicine, Deccan College of Medical Sciences, Hyderabad 500 058, Telangana, India.
Mitochondrion
|September 29, 2024
概括
无细胞线粒体DNA (mtDNA) 在败血症中充当损伤相关分子模式 (DAMP),驱动炎症. 了解mtDNA的理解
科学领域:
- 免疫学 免疫学 免疫学
- 分子生物学分子生物学
- 败血症的发病原因
背景情况:
- 败血症是一种危及生命的疾病,具有复杂的分子机制.
- 与损伤相关的分子模式 (DAMPs) 和与病原体相关的分子模式 (PAMPs) 在败血症的发病过程中至关重要.
- 循环无细胞线粒体DNA (mtDNA) 越来越多地被认为是败血症中重要的DAMP.
研究的目的:
- 审查败血症的分子基础,专注于作为DAMP的无细胞mtDNA.
- 阐明mtDNA释放的机制及其与模式识别受体 (PRRs) 的相互作用.
- 探索无细胞mtDNA在败血症中的诊断,预后和治疗含义.
主要方法:
- 关于败血症发病和无细胞mtDNA的研究的文献综述.
- 分析涉及mtDNA释放和免疫反应的分子机制.
- 对检测无细胞mtDNA的现有和新兴技术的评估.
主要成果:
- 无细胞mtDNA通过与PRRs相互作用触发炎症反应.
- 有各种形式的无细胞mtDNA存在,可以在生物流体中检测到.
- 循环的无细胞mtDNA在败血症中具有潜在的诊断,预后和治疗价值.
结论:
- 无细胞mtDNA是败血症炎症的关键媒介.
- 对mtDNA作用的进一步研究可能会导致新的败血症干预措施.
- 检测和理解无细胞mtDNA对于推进败血症管理至关重要.
相关概念视频
Mitochondrial Membranes
9.1K
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,...
9.1K
Animal Mitochondrial Genetics
7.5K
Among all the organelles in an animal cell, only mitochondria have their own independent genomes. Animal mitochondrial DNA is a double-stranded, closed-circular molecule with around 20,000 base pairs. Mitochondrial DNA is unique in that one of its two strands, the heavy, or H, -strand is guanine rich, whereas the complementary strand is cytosine rich and called the light, or L, -strand. Compared to nuclear DNA, mitochondrial DNA has a very low percentage of non-coding regions and is marked by...
7.5K
ATP Synthase: Mechanism
14.0K
In animals, the mitochondrial F1F0 ATP synthase is the key protein that synthesizes ATP molecules through a complex catalytic mechanism. While the nuclear genome encodes the majority of ATP synthase subunits, the mitochondrial genome encodes some of the enzyme's most critical components. The formation of this multi-subunit enzyme is a complex multi-step process regulated at the level of transcription, translation, and assembly. Defects in one or more of these steps can result in decreased...
14.0K
Translocation 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
Structure of Porins
2.9K
Mitochondria, chloroplasts, and gram-negative bacteria have transmembrane, beta-barrel proteins called porins to mediate the free diffusion of ions and metabolites across the membrane. Mitochondrial porin precursors contain conserved amino acid sequences called beta signals at their C-terminal. Beta signals have a motif of PoXGXXHyXHy (Po-Polar, X-Any amino acid, G-Glycine, Hy-LargeHydrophobic), which are crucial for precursor recognition to initiate precursor assembly. Beta-barrel...
2.9K
The Intrinsic Apoptotic Pathway
6.4K
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...
6.4K


