リン酸コリンは,バイオミメティックイオノマーにおける二重活性をもたらします
Fredrik Nederberg1, Tim Bowden, Bo Nilsson
1Department of Materials Chemistry, Polymer Chemistry, Box 538, Uppsala University, S-751 21 Uppsala, Sweden.
Journal of the American Chemical Society
|November 26, 2004
まとめ
この研究では,新しいフォスフォリルコレイン (PC) 機能化されたポリトリメチレン炭酸 (PTMC) イオノマーが導入されています. この材料は,生物分解性のある医療用アプリケーションに合わせて弾力性と改善された血中相容性を提供します.
科学分野:
- バイオマテリアル科学 バイオマテリアル科学
- ポリマー化学のポリマー化学について
- 表面化学について
背景:
- ポリ・トリメチレン・カーボネート (PTMC) は,生分解性ポリマーで,機械性能が悪い.
- 強化された機械性能と生物互換性を備えたPTMCベースの材料の開発は,in vivoアプリケーションにとって極めて重要です.
研究 の 目的:
- 機能化されたPTMCイオノマー (PC-PTMC-PC) を合成し,特徴づけること.
- 機械的性質と表面の血中相容性を調整するPCグループの二重活動を調査する.
主な方法:
- PC-PTMC-PCイオノマーの合成について.
- 大量の機械特性 (弾性モジュール) の特徴付け.
- PC濃縮を決定する表面分析.
主要な成果:
- PC-PTMC-PCイオノマーはズウィテリオン領域を形成し,物理的なクロスリンクを作成し,フィルムの固さを改善しました.
- イオノマーは,粘り強いPTMC前駆体と比較して,低弾性モジュールを示した.
- 膜表面のPC群の濃縮により,血中適合性が向上した.
結論:
- PC機能化されたPTMCイオノマーは,改善された機械性能と血液適合性のために調整することができます.
- PCグループの二重活動は,バイオメディカル用途のための高度な生物分解性材料の開発のための戦略を提供します.
関連する概念動画
01:35Asymmetric Lipid Bilayer
Biological membranes show uneven distribution of different types of lipids in the inner and outer layers, resulting in transverse asymmetric membranes. The treatment of the erythrocyte membrane with the enzyme phospholipase confirmed the asymmetric nature of the lipid bilayer. The enzyme hydrolyzes lipids into fatty acids and hydrophilic groups. The phospholipase acts only on the outer layer of the membrane, while the inner layer remains intact. The phospholipase treatment resulted in 80%...
01:42Phosphoinositides and PIPs
Phosphoinositides are a group of phospholipids containing a glycerol backbone with two fatty acid chains and a phosphate attached to a myoinositol sugar ring. The inositol head group extends into the cytoplasm, where it is modified by adding phosphate groups to form phosphatidylinositol phosphates or PIPs.
Different phosphoinositides are synthesized and recruited on the cytosolic face of the plasma membrane. The localization of specific phosphoinositides concentrated in separate membrane...
Different phosphoinositides are synthesized and recruited on the cytosolic face of the plasma membrane. The localization of specific phosphoinositides concentrated in separate membrane...
01:27Synthesis of Phosphatidylcholine in the ER Membrane
The ER synthesizes lipids for building cell membranes and performing cellular functions such as energy storage and signaling. The lipid synthesis machinery embedded in the ER membrane primarily collects all reactants from the cytosol. Following synthesis, the secretory pathway and the ER contact sites distribute these lipids to other cellular organelles. Additionally, the energy-rich triacylglycerides are transported from the ER via lipid droplets.
The major components of all eukaryotic cell...
The major components of all eukaryotic cell...
01:22Direct-Acting Cholinergic Agonists: Chemistry and Structure-Activity Relationship
Cholinergic agonists or cholinomimetics mimic the action of acetylcholine to stimulate the parasympathetic nervous system. They are categorized into direct-acting and indirect-acting agents. The direct-acting cholinergic drugs induce the parasympathetic response by directly binding to the muscarinic or nicotine receptors. In comparison, the indirect-acting cholinergic drugs prevent acetylcholine hydrolysis, indirectly contributing to the extended parasympathetic response.
The direct-acting...
The direct-acting...
01:29Indirect-Acting Cholinergic Agonists: Chemistry and Structure-Activity Relationship
Indirect-acting cholinergic agonists are agents that interact with the acetylcholinesterase enzyme in the synaptic cleft, preventing the breakdown of acetylcholine into choline and acetate. Consequently, the concentration of acetylcholine in the synaptic cleft increases. These agonists can be classified into reversible and irreversible inhibitors based on their duration of action.
Reversible inhibitors display short to medium durations of action. Short-acting agents include simple alcohols with...
Reversible inhibitors display short to medium durations of action. Short-acting agents include simple alcohols with...
01:18Indirect-Acting Cholinergic Agonists: Mechanism of Action
Indirect-acting cholinergic agonists work by interacting with an enzyme called acetylcholinesterase (AChE) in the synaptic cleft. They can be reversible or irreversible inhibitors and have different effects on the enzyme.
Reversible inhibitors like edrophonium bind to a specific part of the enzyme called the anionic catalytic site. They form noncovalent bonds, which means they are not strongly attached to the enzyme. This creates a temporary and less stable enzyme–inhibitor complex, leading to...
Reversible inhibitors like edrophonium bind to a specific part of the enzyme called the anionic catalytic site. They form noncovalent bonds, which means they are not strongly attached to the enzyme. This creates a temporary and less stable enzyme–inhibitor complex, leading to...