多剤耐性トランスポーターの複数の分子メカニズム
1MRC Clinical Sciences Centre, Imperial College, Hammersmith Hospital Campus, Du Cane Road, London W12 0NN, UK. chris.higgins@durham.ac.uk
Nature
|April 13, 2007
まとめ
細胞流出ポンプによってしばしば引き起こされる多剤耐性は,がんや感染症などの疾患の効果的な治療を妨げます. これらのトランスポーターを理解することで,臨床での薬剤耐性を克服する希望が生まれます.
科学分野:
- バイオケミストリー バイオケミストリー
- 分子生物学は分子生物学である.
- 薬理学 薬理学とは
背景:
- 多剤耐性 (MDR) は,重要な治療法の有効性を制限し,ヘルスケアに重大な課題をもたらしています.
- P-グリコタンパク質のような活性トランスポーターは,細胞から多様な細胞毒性化合物を排出することによって,MDRの主な駆動因子です.
- P-グリコタンパク質の発見以来数十年にわたる研究にもかかわらず,MDRと闘うための臨床戦略は依然として限られています.
研究 の 目的:
- マルチドラッグトランスポーター機能とマルチスペシフィシティの基礎となるメカニズムを解明する.
- 多剤耐性の頻発の原因を探求する.
- 多剤耐性を克服するための臨床ソリューションの開発の可能性を評価する.
主な方法:
- マルチドラッグトランスポーターの最近の構造的および生化学的データの分析.
- 生物が細胞毒性化合物を排出するために使用する進化的戦略の調査.
- トランスポーターの多種の特異性に対する分子基礎の検討.
主要な成果:
- マルチドラッグ・トランスポーターが多種多様な基質を認識し,輸送する方法に関する新興のメカニズム的洞察.
- 多剤耐性の急速な発展に寄与する固有の生物学的利点を理解する.
- マルチドラッグトランスポーターの主要な構造的および機能的な特徴の特定.
結論:
- 最近の進歩により,多剤輸送メカニズムの理解が深まっています.
- 多剤耐性に対処するには,細胞流出と基板認識の基本的なプロセスをターゲットにする必要があります.
- 臨床薬剤耐性を回避するための将来の治療戦略は,これらのメカニズム的洞察から生まれることがあります.
関連する概念動画
Drug Absorption Mechanism: Carrier-Mediated Membrane Transport
Certain large, lipid-insoluble drug molecules that resemble amino acids, peptides, or glucose, require specialized carrier proteins to facilitate their diffusion across cell membranes. This transport can occur through either facilitated diffusion, which does not require energy input, or active transport, which does require energy input.
Facilitated diffusion is a passive process that utilizes human Solute Carrier (SLC) transporters. These transporters bind to the drug, undergo structural...
Facilitated diffusion is a passive process that utilizes human Solute Carrier (SLC) transporters. These transporters bind to the drug, undergo structural...
Cellular Membranes and Drug Transport
Drugs must traverse multiple biological barriers, such as multi-layered skin, single-layered intestinal epithelium, and the plasma membrane, to reach their target sites within the body. The plasma membrane, a highly structured composite of phospholipids, carbohydrates, and proteins, is the cell's protective boundary, facilitating selective substance exchange.
Phospholipids arrange themselves into a bilayer, with hydrophilic heads oriented outward and hydrophobic tails facing inward.
Phospholipids arrange themselves into a bilayer, with hydrophilic heads oriented outward and hydrophobic tails facing inward.
Carrier-Mediated Transport
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...
Modified-Release Drug Delivery Systems: Classification
Modified-release drug delivery systems improve drug efficacy and minimize side effects by controlling the rate and location of drug release. These systems fall into three categories: rate-programmed, stimuli-activated, and site-targeted.Rate-programmed systems release drugs at a predetermined rate, maintaining consistent therapeutic levels and reducing fluctuations that could lead to toxicity or subtherapeutic effects. These systems use polymeric matrices, reservoir-based designs, or osmotic...
Modified-Release Drug Delivery Systems: Site-Targeted
Site-targeted drug delivery systems enhance therapeutic efficacy while minimizing systemic toxicity and treatment costs. Unlike conventional methods, these systems ensure precise drug delivery, improving bioavailability and reducing side effects. Targeted drug delivery is classified into three levels. First-order targeting directs drugs to the capillary beds of specific organs or tissues. Second-order targets specific cell types, such as tumor cells, using receptor-mediated interactions.
Site-Targeted Drug Delivery Systems: Polymeric Carriers
Polymeric carriers enhance targeted drug delivery by increasing efficacy while minimizing off-target effects. These carriers comprise a biodegradable polymeric backbone integrated with functional elements that enable targeting, improve physicochemical properties, and regulate drug release.Targeting MechanismsThe targeting ability of polymeric carriers is mediated by a homing device, which is a molecular recognition component designed to selectively bind to specific tissues or cells. Monoclonal...


