相关实验视频
Updated: Sep 20, 2025

08:37
Measuring Enzymatic Stability by Isothermal Titration Calorimetry
Published on: March 26, 2019
13.8K
rhGALNS在生理缓冲器中的酶稳定性:对持续释放的影响
Samuel Ruesing1, Samuel Stealey1, Qi Gan2
1Department of Biomedical Engineering, Saint Louis University, 3507 Lindell Blvd, St. Louis, MO, 63103, USA.
Applied biochemistry and biotechnology
|May 24, 2025
概括
聚乙烯甘醇水凝可以稳定酶N-乙甲胺-6-硫酸盐硫酶 (GALNS),用于治疗Morquio A综合征. 与缓冲溶液相比,在水凝内封装提高了酶稳定性,使潜在的持续释放疗法成为可能.
科学领域:
- 生物化学 生物化学
- 生物材料科学 生物材料科学
- 遗传性疾病 遗传性疾病
背景情况:
- 莫尔基奥A综合征是由于GALNS酶的缺乏导致的,这会损害糖氨酸甘油的分解.
- 目前的复合人体GALNS (rhGALNS) 治疗涉及昂贵,耗时的静脉注射,有效性有限.
- 开发一种持续释放的注射装置可以显著改善患者的生活质量.
研究的目的:
- 研究rhGALNS在生理缓冲区和聚乙烯糖醇 (PEG) 水凝中的稳定性.
- 评估使用PEG水凝用于持续输送rhGALNS的可行性.
主要方法:
- rhGALNS的稳定性在酸缓冲盐水 (PBS) 和酸性缓冲液中进行了测试.
- 在不同条件下化后,测量了酶活性和水力动力半径.
- rhGALNS被封装在PEG水凝中,并在释放期间监测其活性超过7天.
主要成果:
- 在PBS中,由于可逆抑制,rhGALNS活性下降了85%,在酸性缓冲中可以恢复.
- 在PBS中化3天导致不可逆转的85%的活性损失,而不会改变水力动力半径.
- 在封装后,rhGALNS的活性保持不变,在从水凝释放7天后,特定活性仅下降了20%.
结论:
- rhGALNS在PBS等生理缓冲中不稳定,阻碍了持续的分娩.
- 在PEG水凝中封闭显著提高了rhGALNS的稳定性和活动保留.
- 作为持续释放rhGALNS和其他在体内不稳定的酶的输送系统,PEG水凝具有前景.
相关概念视频
Protein Buffers in Blood Plasma and Cells
2.2K
The human body utilizes protein buffer systems to maintain a stable pH. These systems capitalize on the dual role of amino acids, which can act as acids or bases by accepting or releasing hydrogen ions in response to pH changes. Protein buffer systems are particularly significant in the extracellular fluid (ECF) and intracellular fluid (ICF) of active cells, where structural and functional proteins provide substantial buffering capacity.
Certain amino acids can exist in a zwitterion state at a...
Certain amino acids can exist in a zwitterion state at a...
2.2K
Factors Affecting Dissolution: Drug pKa, Lipophilicity and GI pH
2.0K
Drug absorption within the gastrointestinal (GI) tract is a complex process influenced by several critical factors, including the site pH, the drug's dissociation constant (pKa), and the drug's lipophilicity. The GI tract exhibits a pH gradient, with an acidic environment in the stomach and a more alkaline environment in the small intestine. This pH variation directly affects the ionization state of drugs.
A drug's pKa and the pH of the gastrointestinal (GI) tract play crucial roles...
A drug's pKa and the pH of the gastrointestinal (GI) tract play crucial roles...
2.0K
RNA Stability
34.0K
Intact DNA strands can be found in fossils, while scientists sometimes struggle to keep RNA intact under laboratory conditions. The structural variations between RNA and DNA underlie the differences in their stability and longevity. Because DNA is double-stranded, it is inherently more stable. The single-stranded structure of RNA is less stable but also more flexible and can form weak internal bonds. Additionally, most RNAs in the cell are relatively short, while DNA can be up to 250 million...
34.0K
Factors Affecting Dissolution: Drug Permeability, Stability and Stereochemistry
269
Orally administered drugs primarily enter the systemic circulation via passive diffusion through the intestinal membranes. The drug's absorption is influenced by drug stability in the gastrointestinal GI tract, membrane permeability, the surface area available for absorption, luminal drug concentration, and residence time in the lumen. Drug permeability can be enhanced by adjusting the lipophilicity, polarity, or molecular size of the drug, promoting its passive transport across intestinal...
269
Phosphate Buffer
3.2K
The phosphate buffer system is a critical biological mechanism for maintaining pH stability in the body. This system operates primarily through two components: sodium dihydrogen phosphate (NaH2PO4), which acts as a weak acid, and sodium hydrogen phosphate (Na2HPO4), which serves as a weak base.
Sodium dihydrogen phosphate does not fully dissociate in neutral or acidic solutions. When a strong base, such as sodium hydroxide (NaOH), is introduced into the solution, sodium dihydrogen phosphate...
Sodium dihydrogen phosphate does not fully dissociate in neutral or acidic solutions. When a strong base, such as sodium hydroxide (NaOH), is introduced into the solution, sodium dihydrogen phosphate...
3.2K
Buffer Effectiveness
50.5K
Buffer solutions do not have an unlimited capacity to keep the pH relatively constant . Instead, the ability of a buffer solution to resist changes in pH relies on the presence of appreciable amounts of its conjugate weak acid-base pair. When enough strong acid or base is added to substantially lower the concentration of either member of the buffer pair, the buffering action within the solution is compromised.
The buffer capacity is the amount of acid or base that can be added to a given volume...
The buffer capacity is the amount of acid or base that can be added to a given volume...
50.5K

