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Factors Affecting Drug Distribution: Tissue Permeability01:30

Factors Affecting Drug Distribution: Tissue Permeability

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The drug distribution process within the human body is a complex interplay of various physicochemical properties inherent to the drugs. These properties, including molecular size, ionization degree, partition coefficient, and stereochemical nature, significantly impact how drugs permeate biological membranes to reach their target tissues.
Small molecules with a molecular weight below 500 to 600 Daltons can easily pass through the capillary membrane, gaining access to different tissues. Larger...
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Bioavailability Enhancement: Drug Permeability Enhancement01:27

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Body:After oral administration, poor permeability often limits the rate at which drugs are absorbed through the intestinal epithelium. Enhancing drug permeability is crucial for effective therapy, and several strategies have been developed to overcome this challenge.One effective strategy involves the use of lipid-based formulations. These formulations enhance dissolution and solubility, targeting physiological mechanisms to increase drug absorption. This includes stimulating bile salt...
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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...
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ダイナミック・プロトネーションは,薬のような分子の膜透過性に劇的な影響を与える

Zhi Yue1, Chenghan Li1, Gregory A Voth1

  • 1Department of Chemistry, James Frank Institute, and Institute for Biophysical Dynamics , The University of Chicago , Chicago , Illinois 60637 , United States.

Journal of the American Chemical Society
|August 7, 2019
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まとめ
この要約は機械生成です。

充電された薬が膜に浸透することは,ダイナミックな中和によってよりよく理解されます. この研究は,プロプラノロルが脂質界面でどのように中和し,薬物の吸収と発達のモデルを改善することを明らかにしています.

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科学分野:

  • バイオ物理学
  • コンピュータ化学
  • 薬理学について

背景:

  • 生物膜の透過性は薬剤の吸収と発育に不可欠です.
  • 薬剤の浸透は限られていて 従来のモデルに 挑戦しています
  • 証拠によると 充電された種は膜に浸透できますが そのメカニズムは不明です

研究 の 目的:

  • 原子レベルでイオン化可能な分子の陽子結合浸透を調査する.
  • ダイナミック・プロトネーションが膜の透過性 (P_m) に与える影響を評価する.
  • pH相乗分断と浸透のための改訂されたモデルを開発する.

主な方法:

  • 連続的な定数pHの分子動態シミュレーション
  • 自由エネルギー採取技術
  • 弱い塩基であるプロプラノロール (PPL) の浸透性を研究する.

主要な成果:

  • プロプラノロール (PPL) は,脂質尾界面で動的に中和する.
  • ダイナミック・ニュートラライゼーションは, 浸透の自由エネルギーの風景を大幅に変化させます.
  • 従来のモデルは,ダイナミック・ニュートラライゼーションを無視したため,内在の浸透性を過大評価する.

結論:

  • ダイナミックなプロトネーション状態の変化は,イオン化可能な分子浸透に不可欠です.
  • 改訂されたモデルが提案され,pH相乗分割と浸透をよりよく記述する.
  • 薬剤の膜浸透に関する標準モデルの見直しが必要である.