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Videos de Conceptos Relacionados

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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Efectos de los sustitutos en las interacciones aromáticas de borde a cara.

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
Resumen

Las interacciones de los anillos de benceno se exploran utilizando cálculos ab initio. El tipo de sustituto dicta si el posicionamiento axial o facial ofrece una mayor estabilidad, influyendo en las interacciones y conformaciones moleculares.

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Área de la Ciencia:

  • Química computacional es la química computacional.
  • La Química Física es la química física.
  • Química cuántica es la química cuántica.

Sus antecedentes:

  • Comprender las interacciones no covalentes en sistemas aromáticos sustituidos es crucial para el diseño molecular.
  • Los sistemas aromáticos exhiben complejas interacciones edge-to-face influenciadas por las propiedades electrónicas sustitutivas.

Objetivo del estudio:

  • Para investigar las interacciones edge-to-face de los benzenos sustituidos axialmente y facialmente.
  • Para determinar las contribuciones energéticas de varias interacciones (electrostática, inducción, dispersión, repulsión de intercambio) a la estabilización / desestabilización.
  • Para correlacionar los efectos electrónicos sustituyentes con las conformaciones de interacción preferidas.

Principales métodos:

  • Se emplearon cálculos químicos cuánticos ab initio para modelar las interacciones.
  • Análisis de las diferencias energéticas entre los sistemas de benceno sustituido y no sustituido.
  • Descomposición de las energías de interacción en componentes electrostáticos, de inducción, dispersión y repulsión de intercambio.

Principales resultados:

  • Se predijeron diferencias máximas de energía de ~0.7 kcal/mol (axial/facial) y ~1.2 kcal/mol (sustitución dual).
  • La estabilización de la sustitución axial se correlaciona con las energías electrostática e inductiva, influenciadas por la densidad de electrones de para-posición.
  • La sustitución facial involucra electrostática, dispersión y repulsión de intercambio; la dispersión es dominante pero modulada por la repulsión de intercambio.
  • Los sustituyentes que aceptan electrones favorecen las conformaciones axiales; los sustituyentes donantes de electrones favorecen las conformaciones faciales.

Conclusiones:

  • El tipo y la posición de los sustituyentes impactan significativamente las energías de interacción de borde a cara del benceno y las conformaciones preferidas.
  • Las propiedades electrónicas de los sustituyentes son los principales impulsores de la estabilización / desestabilización a través de efectos electrostáticos e inducción.
  • La dispersión y la repulsión de intercambio juegan un papel crítico, especialmente en las sustituciones faciales, aumentando las contribuciones electrostáticas.