相关实验视频
Updated: Sep 10, 2025

07:04
Identifying PD-1/PD-L1 Inhibitors with Surface Plasmon Resonance Technology
Published on: May 2, 2025
538
通过DMH1抑制P-糖蛋白介导的流动
Zhijun Wang1, Chen Xie2, Maggie Chou1
1Department of Clinical Pharmacy Practice, School of Pharmacy & Pharmaceutical Sciences, University of California, Irvine, CA 92697, USA.
Biomedicines
|August 28, 2025
概括
通过增加细胞内药物度而增强化疗效,而不会引起细胞毒性. 这种全抑制剂有望克服多种药物耐药性.
科学领域:
- 生物化学
- 分子生物学
- 药理学
背景情况:
- P-glycoprotein (P-gp) 活跃出口药物,导致多种药物耐药性并降低化疗的有效性.
- 由于毒性,特异性差,有效性有限,现有的P- gp抑制剂尚未获得临床批准.
- 本研究探讨DMH1,一种I型BMP受体抑制剂,作为一种潜在的P- gp抑制剂.
研究的目的:
- 研究DMH1作为一种新型P-glycoprotein (P-gp) 抑制剂的潜力.
- 评估DMH1在克服P-gp介导的多药耐药性的有效性.
- 为了阐明DMH1的P-gp抑制机制.
主要方法:
- 在P-gp过度表达和缺陷细胞系中进行细胞毒性测试 (MTT).
- 用于评估P-gp抑制的素AM保留和鲁素积累测试.
- 动力分析,ATPase活性测定和分子对接以确定抑制机制.
主要成果:
- 在测试的细胞系中,DMH1 没有表现出细胞毒性.
- DMH1显著增加了卡尔西因AM和鲁的细胞内积累.
- 动力分析显示DMH1具有非竞争性,全性抑制,Vmax降低,Km不变.
- DMH1 剂量依赖地抑制了 P- gp ATPase 活性,并且对接表明了全结合.
结论:
- 作为一个非竞争性的,全osteric P- gp 抑制剂.
- 在没有相关的细胞毒性的情况下,DMH1增强了细胞内药物保留.
- DMH1代表了一种有前途的化合物,用于开发克服多种药物耐药性和改善化疗结果的新策略.
相关概念视频
Carrier-Mediated Transport
541
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...
541
Allosteric Regulation
59.0K
Allosteric regulation of enzymes occurs when the binding of an effector molecule to a site that is different from the active site causes a change in the enzymatic activity. This alternate site is called an allosteric site, and an enzyme can contain more than one of these sites. Allosteric regulation can either be positive or negative, resulting in an increase or decrease in enzyme activity. Most enzymes that display allosteric regulation are metabolic enzymes involved in the degradation or...
59.0K
Abnormal Proliferation
4.6K
Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the...
4.6K
Cooperative Allosteric Transitions
8.0K
Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...
8.0K
Allosteric Proteins-ATCase
5.9K
Binding sites linkages can regulate a protein's function. For example, enzyme activity is often regulated through a feedback mechanism where the end product of the biochemical process serves as an inhibitor.
Aspartate transcarbamoylase (ATCase) is a cytosolic enzyme that catalyzes the condensation of L-aspartate and carbamoyl phosphate to N-carbamoyl-L-aspartate. This reaction is the first step in pyrimidine biosynthesis. UTP and CTP, the end products of the pyrimidine synthesis...
Aspartate transcarbamoylase (ATCase) is a cytosolic enzyme that catalyzes the condensation of L-aspartate and carbamoyl phosphate to N-carbamoyl-L-aspartate. This reaction is the first step in pyrimidine biosynthesis. UTP and CTP, the end products of the pyrimidine synthesis...
5.9K
Feedback Inhibition
54.5K
Biochemical reactions are occurring constantly in cells, converting starting substances to different products, usually with the help of enzymes that speed the reactions. Without enzymes, it would take far too long for most reactions to occur to be useful to the cell!
54.5K

