相关实验视频
Updated: Sep 18, 2025

07:54
Cholesterol Efflux Assay
Published on: March 6, 2012
30.1K
7-基托胆固醇对LAT1载体的功能和稳定性的影响
Raffaella Scanga1, Mariafrancesca Scalise1, Fangrui Xiu2
1Department DiBEST (Biologia, Ecologia, Scienze della Terra) Unit of Biochemistry and Molecular Biotechnology, University of Calabria, Arcavacata di Rende, Italy.
Biochemical pharmacology
|June 25, 2025
概括
氧化胆固醇,像7-基托胆固醇一样,损害了L型氨基酸载体 (LAT1) 的功能和稳定性. 这种载体对大脑和胎儿发育至关重要,其功能障碍可能会影响各种慢性疾病.
科学领域:
- 生物化学 生化学
- 细胞生物学 细胞生物学
- 神经科学是一个神经科学.
背景情况:
- L型氨基酸载体 (LAT1,SLC7A5) 对于运输对大脑和胎儿发育至关重要的必需氨基酸至关重要.
- 胆固醇在调节LAT1功能和稳定性的作用之前已经在实验模型中得到证实.
研究的目的:
- 研究氧化胆固醇形式,特别是7-胆固醇,对LAT1功能和稳定性的影响.
- 阐明氧化醇影响LAT1介导运输及其与ATP的相互作用的机制.
主要方法:
- 使用过度表达人类LAT1的HEK293细胞来研究用7-胆固醇替代胆固醇的效果.
- 为了评估运输活性和ATP刺激,LAT1被重组为蛋白质体,并补充了各种氧醇.
- 进行热稳定性测试以评估蛋白质完整性.
主要成果:
- 用7-基托胆固醇部分替代胆固醇降低了LAT1介导的传输 (Vmax) 和降低了蛋白质的热稳定性.
- 7 - 基托胆固醇改变了LAT1蛋白质组的ATP刺激,可能是由于膜刚度增加和ATP结合能力减弱.
- 其他氧化醇,7α-基胆固醇和25-基胆固醇也抑制了LAT1运输功能.
结论:
- 氧化胆固醇物种,特别是7-基托胆固醇,对LAT1转运器功能和稳定性产生负面影响.
- 这些发现表明,在病理条件下改变胆固醇/氧化胆固醇比率可能会导致LAT1功能障碍.
- 该研究强调了这些影响在代谢综合征,病和神经系统疾病等慢性疾病中的潜在相关性.
相关概念视频
Cholesterol: Significance and Regulation
698
Although not a source of energy, cholesterol plays a significant role as a foundational structure for bile salts, steroid hormones, and vitamin D, as well as being a crucial component of plasma membranes. Approximately 15% of blood cholesterol is derived from our diet, with the remainder synthesized from acetyl CoA by the liver and intestines. Cholesterol is eliminated from the body through its conversion into bile salts, which are eventually discarded in the feces.
Considering cholesterol and...
Considering cholesterol and...
698
Regulation of Nuclear Protein Sorting
2.4K
Nuclear protein sorting regulates nucleus composition and gene expression, crucial for determining the fate of a eukaryotic cell. Hence, the entry and exit of molecules across the nuclear envelope is a tightly controlled process. Nuclear protein sorting can be inhibited by one of the following ways: 1) masking cargo signal sequences, 2) modifying the nuclear receptor's affinity for cargo, 3) controlling the nuclear pore size, 4) retaining the cargo during its transit to the cytosol or the...
2.4K
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
Nonlinear Pharmacokinetics: Role of Transporters
101
A drug's nonlinear kinetics can be influenced by a diverse range of transporter proteins that serve as crucial players in drug distribution. These transporters, found within cells, can enhance or reduce local drug concentrations by facilitating the influx or efflux of drugs. For instance, the expression of xenobiotic transporters can be influenced by factors such as age and gender, potentially impacting the linearity of drug response.
Polymorphisms occurring in drug transporters can alter...
Polymorphisms occurring in drug transporters can alter...
101
Carrier-Mediated Transport
559
Carrier-mediated transport is a pivotal process in drug absorption, particularly for lipid-insoluble drugs, and encompasses facilitated diffusion and active transport. Facilitated diffusion allows drugs to move along their concentration gradient without energy expenditure, while active transport utilizes ATP to drive drug movement against this gradient.
Active transport involves two types of membrane-spanning transporters: uptake and efflux. Uptake transporters are expressed in the small...
Active transport involves two types of membrane-spanning transporters: uptake and efflux. Uptake transporters are expressed in the small...
559
ABC Transporters: Exporter
5.0K
ATP-binding cassette or ABC transporter is the largest superfamily of integral membrane proteins. The transporters have transmembrane-binding domains (TMDs) and nucleotide-binding domains (NBDs). The TMDs are specific to their substrates, whereas the NBDs are similar to engines that complete ATP hydrolysis to complete the substrate transport. They can be full transporters consisting of two TMDs and NBDs, half transporters with one TMD and NBD, while some encoded with a single TMD or NBD are...
5.0K

