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Drug-Receptor Interactions01:29

Drug-Receptor Interactions

Drug-receptor interaction describes the binding of receptors by drugs, but not all drug-receptor interactions result in activation and tissue response. For instance, the binding of agonists activates the receptor to generate a cellular reaction, while antagonists bind to receptors without causing their activation.
Several parameters, such as the drug's affinity for its receptor and its efficacy, which is its ability to activate the receptor, determine the drug's effect on the tissue.
Drug-Receptor Interaction: Agonist01:25

Drug-Receptor Interaction: Agonist

Agonists are drugs that interact with specific receptors in the body to produce a biological response. When an agonist binds to a receptor, it activates or enhances the receptor's function, leading to physiological effects. The interaction between agonist drugs and receptors is crucial for their therapeutic action in various medical treatments.
Agonists can bind to receptors in different ways. Some agonists bind directly to the receptor's active site, mimicking the endogenous ligand's action.
Combined Effects of Drugs: Antagonism01:30

Combined Effects of Drugs: Antagonism

The combined effects of drugs can result in various interactions, of which an important type is antagonism. Antagonism is a mechanism where one drug inhibits or counteracts the effects of another drug. Antagonism can occur through various means, including receptor binding, allosteric modulation, functional interaction, chemical reactions, and pharmacokinetic processes.
The most common type is receptor antagonism, where one drug acts as an antagonist to block the effects of another drug by...
Combined Effects of Drugs: Synergism01:27

Combined Effects of Drugs: Synergism

Synergism is a useful mechanism where combining two or more drugs is more effective than each constituent used alone. Such combinations are also called supra-additive interactions. The drugs collectively enhance the final therapeutic effect by acting on different targets. Another advantage is that the low dose of each constituent drug is sufficient to achieve the desired effect. This helps reduce the duration of therapy and lower the adverse effects of these drugs.
Such synergistic combinations...
Agonism and Antagonism: Quantification01:14

Agonism and Antagonism: Quantification

When drugs are administered, they can elicit either an agonist or antagonist effect on the body. Agonism occurs when a drug activates a specific receptor, triggering a biological response. On the other hand, antagonism happens when a drug binds to the same receptors but blocks their activation, thereby preventing a biological response.
To quantify these effects, researchers use a dose-response curve, which provides valuable information about the potency and efficacy of a drug. Potency refers to...
Drug toxicity: Drug–Drug Interaction01:30

Drug toxicity: Drug–Drug Interaction

Drug–drug interactions can precipitate toxicity through multiple mechanisms. Absorption interactions alter how drugs enter the body, exemplified when ranitidine increases the absorption of basic drugs, while cholestyramine decreases the levels of propranolol. Protein binding interactions occur when drugs share the same binding sites on plasma proteins. Drugs like aspirin and warfarin, when bound in excess, can lead to increased free drug concentrations, enhancing the potential for...

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エッジ・ツー・フェイス・アロマティック相互作用に対する置換剤の効果

Eun Cheol Lee1, Byung Hee Hong, Ju Young Lee

  • 1National Creative Research Initiative Center for Superfunctional Materials, Department of Chemistry, Division of Molecular and Life Sciences, Pohang University of Science and Technology, San 31, Hyojadong, Namgu, Pohang 790-784, Korea.

Journal of the American Chemical Society
|March 24, 2005
PubMed
まとめ

ベンゼン環の相互作用は,ab initio計算を用いて調査されています. 置換型は,軸または顔の位置がより高い安定性を提供するか否かを決定し,分子相互作用や形状に影響を与えます.

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科学分野:

  • コンピューティング・ケミストリー
  • 物理化学 物理化学
  • 量子化学とは,量子化学である.

背景:

  • 置換された芳香系における非共性相互作用を理解することは,分子設計において極めて重要です.
  • アロマティックシステムは,置換電子特性の影響を受けた複雑なエッジ・トゥ・フェイス相互作用を示します.

研究 の 目的:

  • 軸と面で置換されたベンゼンのエッジ・ツー・フェイス相互作用を調査する.
  • 安定化/不安定化に対する様々な相互作用 (静電,誘導,分散,交換反発) のエネルギー貢献を決定する.
  • 代替電子効果と好ましい相互作用形状を相関させるため.

主な方法:

  • 相互作用をモデル化するために,Ab initio量子化学計算が採用されました.
  • 代替および非代替ベンゼンシステムのエネルギー差の分析.
  • 相互作用エネルギーの分解は,静電,誘導,分散,交換反発の構成要素に分解される.

主要な成果:

  • 最大エネルギー差は ~0.7 kcal/mol (軸/顔) と ~1.2 kcal/mol (二重置換) と予測されました.
  • 軸置換安定化は,パラポジション電子密度の影響を受ける静電および誘導エネルギーと相関する.
  • 顔の置換には静電,分散,交換反発が含まれる;分散は支配的だが,交換反発によって調節される.
  • 電子受容置換物は軸形状を好み,電子提供置換物は顔形状を好む.

結論:

  • 置換物の種類と位置は,ベンゼンのエッジ・ツー・フェイス相互作用エネルギーと好ましい形状に大きな影響を与えます.
  • 置換物の電子的性質は,静電および誘導効果による安定化/不安定化の主要な要因である.
  • 分散と交換反発は,特に顔の置換で,静電的貢献を増強する重要な役割を果たします.