通过使用聚多巴胺涂层的半孔纳米颗粒对胰岛岛进行受控的营养递送
Rosita Primavera1, Jing Wang1, Peter Buchwald2
1Department of Radiology, Interventional Radiology Innovation at Stanford (IRIS), Stanford University School of Medicine, Palo Alto, California 94304, United States.
Nano letters
|January 10, 2025
概括
一个新的纳米平台可以提供谷氨酸 (G),以支持移植的胰腺小岛. 这种聚多巴胺涂层的半孔氧化纳米粒子系统增强了糖尿病小鼠的小岛植入和功能.
科学领域:
- 生物材料科学 生物材料科学
- 再生医学是一种再生医学.
- 纳米技术纳米技术
背景情况:
- 移植的胰腺小岛需要持续的营养支持来维持生存和功能.
- 炎症状况可能会危及移植后的小岛生命力.
- 半孔纳米粒子 (MSNPs) 为药物和营养物质的输送提供了一个多功能平台.
研究的目的:
- 设计和优化一个纳米级平台,持续向胰腺小岛输送谷氨酸.
- 评价平台在支持小岛的生存能力和功能方面的有效性ex vivo和in vivo.
主要方法:
- 制造含有多多巴胺 (PD) 涂层的MSNP,装载着谷氨胺 (G).
- 优化PD度和受控G释放的潜伏时间.
- 在炎症条件下对小岛的活力和功能进行了ex vivo评估.
- 在体内评估小岛植入和STZ糖尿病小鼠的血糖控制.
主要成果:
- 优化的PD-G-MSNP (0.5 mg/mL PD,0.5小时化时间) 显示出对小岛的活力和功能ex vivo的优越支持,特别是在炎症下.
- 在体内研究表明,PD-G-MSNP与单独使用G相比,显著改善了小岛植入和功能.
- 用PD-G-MSNP治疗的小鼠在移植后30天内保持了血糖控制.
结论:
- 开发的PD-G-MSNP纳米级平台能够持续提供谷氨酸,这对于支持移植小岛至关重要.
- 这种平台有望通过提供至关重要的营养素来提高小岛移植的成功率,直到血管化发生.
更多相关视频
08:04Author Spotlight: Investigating Islet Abnormalities and Function with a Pseudoislet Protocol
Published on: November 3, 2023
1.9K
09:31Sustained Administration of β-cell Mitogens to Intact Mouse Islets Ex Vivo Using Biodegradable Poly(lactic-co-glycolic acid) Microspheres
Published on: November 5, 2016
7.2K
相关概念视频
Glucose Homeostasis: Pancreatic Islets and Insulin Secretion
1.1K
The pancreatic islets comprising only 1%-2% of the volume are highly vascularized and innervated mini-organs. They contain five endocrine cell types, including β cells that secrete insulin, which is synthesized as a single polypeptide chain, preproinsulin, processed to proinsulin, and finally to insulin and C-peptide. This process is complex and regulated, involving the Golgi complex, the endoplasmic reticulum, and the secretory granules of the β cell.
Insulin and C-peptide are...
Insulin and C-peptide are...
1.1K
Insulin Secretory Vesicles
4.8K
Insulin secretory vesicles release insulin to stimulate blood glucose uptake and regulate carbohydrate metabolism. When the blood glucose levels increase, glucose enters the pancreatic β-islet cells through glucose transporters. Once inside, glucose is metabolized through glycolysis, the citric acid cycle, and the electron transport chain, producing ATP. This increase in ATP concentration closes ATP-sensitive potassium channels, leading to depolarization of the membrane and the opening of...
4.8K
Insulin: Biosynthesis, Chemistry, and Preparation
354
The endoplasmic reticulum (ER) of pancreatic β-cells synthesizes preproinsulin, which consists of a signal peptide, A and B chains, and a C-peptide. Preproinsulin is then cleaved and folded into proinsulin, which translocates to the Golgi apparatus for sorting and packaging into secretory granules. In these granules, enzymatic clipping generates insulin and C-peptide.
Damage or functional impairment of β-cells inhibits insulin production, leading to diabetes. Diabetes treatment...
Damage or functional impairment of β-cells inhibits insulin production, leading to diabetes. Diabetes treatment...
354
