宿主器官相互作用促进胆固醇的收购通过Trypanosoma cruzi Amastigotes
Carolina de Lima Alcantara1,2, Miria Gomes Pereira1,2, Wanderley de Souza1,2
1Centro de Pesquisas em Medicina de Precisão, Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil.
The Journal of eukaryotic microbiology
|July 21, 2025
概括
草虫 (Trypanosoma cruzi amastigotes) 直接从宿主细胞中获取必需的胆固醇,利用宿主膜接触部位进行吸收. 这一发现揭示了在查加斯病感染期间寄生虫生存和生长的关键机制.
科学领域:
- 寄生虫学的寄生虫学
- 细胞生物学 细胞生物学
- 传染性疾病 传染性疾病
背景情况:
- 由Trypanosoma cruzi引起的查加斯病是一种被忽视的热带疾病.
- 细胞内巨对寄生虫的持续性至关重要,并严重依赖宿主脂质,特别是胆固醇,进行发育.
- 通过T. cruzi amastigotes获得宿主胆固醇的精确机制在很大程度上是未知的.
研究的目的:
- 为了研究和阐明胆固醇从宿主细胞到细胞内Trypanosoma cruzi amastigotes的贩运机制.
- 确认宿主衍生胆固醇对羊的发育和生存的重要性.
主要方法:
- 使用光胆固醇模拟物来跟踪阿马斯蒂哥特的胆固醇吸收.
- 使用共聚焦和体积电子显微镜可视化和分析胆固醇贩运和宿主-寄生虫相互作用.
- 研究了阿马斯蒂哥特对宿主内质网膜 (ER) 和戈尔吉标记物的内化.
主要成果:
- 通过T. cruzi amastigotes证明直接摄取胆固醇,具有特征的摄取动力学.
- 证实胆固醇的获取对于寄生虫的发展至关重要.
- 观察到宿主ER与虫血之间的密切接触,表明膜接触点有助于吸收.
- 显示的阿马斯蒂哥特可以将宿主ER和戈尔吉衍生标记内部化,表明宿主分子的潜在获取路径.
结论:
- 马斯蒂哥特活跃地从宿主细胞中获取胆固醇,这一过程对它们的细胞内发育至关重要.
- 主体ER和寄生虫血之间的膜接触点可能在促进这种脂质获取方面发挥作用.
- 这些发现为细胞内寄生虫的代谢适应性和宿主依赖性提供了新的见解.
更多相关视频
相关概念视频
Protein Translocation Machinery on the ER Membrane
4.9K
The translocon complex situated on the ER membrane is the main gateway for the protein secretory pathway. It facilitates the transport of nascent peptides into the ER lumen and their insertion into the ER membrane.
Sec61 protein conducting channel
In eukaryotes, the translocon complex comprises a core heterotrimeric translocator channel called the Sec61 complex. This channel includes three transmembrane proteins, Sec61α, Sec61β, and Sec61γ, and is the largest subunit of the...
Sec61 protein conducting channel
In eukaryotes, the translocon complex comprises a core heterotrimeric translocator channel called the Sec61 complex. This channel includes three transmembrane proteins, Sec61α, Sec61β, and Sec61γ, and is the largest subunit of the...
4.9K
Receptor-mediated Endocytosis
106.0K
Overview
106.0K
Tail-anchoring of Proteins in the ER Membrane
3.2K
Tail-anchored, or TA, proteins are estimated to make up to 3-5% of membrane proteins found in the eukaryotic cell. Such proteins have a single transmembrane domain located approximately 30 amino acid residues upstream from the C-terminal end. As a result, the signal recognition particle (SRP) cannot guide a TA protein to the ER membrane for cotranslational insertion. Hence, they are integrated into the ER membrane post-translationally using their C-terminal end as the anchor. TA proteins...
3.2K
Protein Transport into the Inner Mitochondrial Membrane
4.1K
Nuclear encoded mitochondrial precursors are imported to the inner membrane in a multistep process involving two separate translocons, TIM22 and TIM23. TIM23 is a cation-selective pore that remains closed by the N terminal segment of the protein. Negative charges on the TIM23 act as a receptor for the incoming precursor, pulling the positively charged matrix-targeting sequence for peptide insertion and translocation.
Transport of mitochondrial precursors across the TIM23 channel is driven by...
Transport of mitochondrial precursors across the TIM23 channel is driven by...
4.1K
Intralumenal Vesicles and Multivesicular Bodies
3.7K
Intraluminal vesicles (ILVs) are small vesicles 50-80 nm in diameter formed during the maturation of early endosomes. A specialized endosome containing numerous ILVs is called a multivesicular body (MVB). ILVs contain internalized molecules such as antigens, nucleic acids, proteins, and metabolites. Some of these molecules are released from the MVBs inside exosomes and are transported to other cells. Other MVBs contain molecules that are retained in the ILVs and are later degraded within the...
3.7K
Clathrin Coated Vesicles
7.2K
Clathrin-coated vesicles use endocytosis to transport receptors and lysosomal hydrolases from the Golgi to the lysosome in the late secretory pathway. Clathrin-mediated endocytosis was the first described endocytic process, and Clathrin-coated vesicles remain one of the most well-studied transport vesicles. The molecular machinery that generates clathrin-coated vesicles comprises over 50 proteins that precisely coordinate vesicle formation. Cell surface receptors concentrated in indented sites...
7.2K


