Search research articles

ACERCA DE JoVE

Visión General Liderazgo Blog Centro de Ayuda JoVE

AUTORES

Proceso de Publicación Consejo Editorial Alcance y Políticas Revisión por Pares Preguntas Frecuentes Enviar

BIBLIOTECARIOS

Testimonios Suscripciones Acceso Recursos Consejo Asesor de Bibliotecas Preguntas Frecuentes

INVESTIGACIÓN

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archivo

EDUCACIÓN

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Centro de Recursos para Profesores Sitio de Profesores

Términos y Condiciones de Uso

Política de Privacidad

Videos de Conceptos Relacionados

Agonism and Antagonism: Quantification

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...

Adrenergic Antagonists: Pharmacological Actions of ɑ-Receptor Blockers

Adrenergic Antagonists: Pharmacological Actions of ɑ-Receptor Blockers

α-Adrenergic antagonists, known as α-blockers, exert their effects by inhibiting α-adrenoceptors, leading to specific physiological actions. α1-blockers and α2-blockers have distinct pharmacological actions and therapeutic applications.
α1-blockers: These drugs inhibit α1-adrenoceptors on smooth muscle cells, resulting in vasodilation. This vasodilation lowers blood pressure, making α1-blockers valuable in treating hypertension. Additionally,...

Adrenergic Antagonists: Pharmacological Actions of β-Receptor Blockers

Adrenergic Antagonists: Pharmacological Actions of β-Receptor Blockers

β-receptor blockers significantly impact the cardiovascular system by counteracting catecholamine-induced sympathetic responses. These medications decrease heart rate, contractility, and cardiac output, potentially leading to cardiac depression, life-threatening bradycardia, and death. Therapeutically, β-blockers function as mild antihypertensives and are utilized in treating angina pectoris and cardiac arrhythmias. However, nonselective β-blockers inhibit β2-receptors in...

Adrenergic Antagonists: ɑ and β-Receptor Blockers

Adrenergic Antagonists: ɑ and β-Receptor Blockers

Third-generation β-blockers, such as labetalol and carvedilol, represent a significant advancement in managing cardiovascular conditions. Unlike conventional β-blockers, which can induce peripheral vasoconstriction, third-generation drugs block α1 adrenoceptors. This promotes vasodilation through several mechanisms, such as increased nitric oxide production, inhibition of calcium ion entry, opening of potassium ion channels, and antioxidant action. Labetalol, for instance, is...

The Small x Assumption

The Small x Assumption

If a reaction has a small equilibrium constant, the equilibrium position favors the reactants. In such reactions, a negligible change in concentration may occur if the initial concentrations of reactants are high and the Kc value is small. In such circumstances, the equilibrium concentration is approximately equal to its initial concentration. This estimation can be used to simplify the equilibrium calculations by assuming that some equilibrium concentrations are equal to the initial...

Adrenergic Agonists: Mixed-Action Agents

Adrenergic Agonists: Mixed-Action Agents

Mixed-action adrenergic agonists, like ephedrine and pseudoephedrine, directly and indirectly affect adrenergic receptors. These agents stimulate adrenoceptors and indirectly release stored neurotransmitters, amplifying the adrenergic response.
Ephedrine and pseudoephedrine lack a catecholamine group, making them less susceptible to degradation by metabolic enzymes. They have increased oral bioavailability and lipophilicity, resulting in a longer duration of action. Their response is reduced by...

También podría leer

Artículos Relacionados

Artículos vinculados a este trabajo por autores compartidos, revista y gráfico de citas.

Ordenar por

Same author

From Primary Melanoma to Metastatic Evolution: AI-Powered Pathology Integrated with Functional Analysis and Clinical Metadata Improving Treatment Prediction.

Cancers·2026

Same author

Specific Aneuploidies Predict Immune Evasion and Poor Immunotherapy Response in Melanoma.

bioRxiv : the preprint server for biology·2026

Same author

Spatial Mapping of the Precancer-to-Cancer Transition in Breast and Prostate.

Cancer discovery·2026

Same author

Pan-cancer proteogenomic interrogation of the Ubiquitin Proteasome System.

bioRxiv : the preprint server for biology·2026

Same author

Predicting Intraocular Pressure From Glaucoma Patients Receiving Medication Treatment Using Explainable Machine Learning.

BioMed research international·2026

Same author

Predicting Intraocular Pressure From Glaucoma Patients Receiving Medication Treatment Using Explainable Machine Learning.

BioMed research international·2026

Same journal

A viral ORFeome library for systems-level genetic dissection of host-pathogen interactions.

Cell·2026

Same journal

Co-option of lysosomal machinery shapes the evolution of the intracellular photosymbiosis supporting coral reefs.

Cell·2026

Same journal

LEF1 and niche factors determine T cell stemness across chronic diseases.

Cell·2026

Same journal

Recurrent patterns of TOP1-mediated neuronal genomic damage shared by major neurodegenerative disorders.

Cell·2026

Same journal

Four-dimensional molecular mapping from a spatial snapshot reveals the dynamics of hair follicle organogenesis.

Cell·2026

Same journal

Whole-cell particle-based digital twin simulations from 4D lattice light-sheet microscopy data.

Cell·2026

Ver todos los artículos relacionados

Search research articles

Video Experimental Relacionado

Updated: Mar 31, 2026

HPLC-based Assay to Monitor Extracellular Nucleotide/Nucleoside Metabolism in Human Chronic Lymphocytic Leukemia Cells

HPLC-based Assay to Monitor Extracellular Nucleotide/Nucleoside Metabolism in Human Chronic Lymphocytic Leukemia Cells

Published on: July 20, 2016

Mucho ruido sobre cero

Jef D Boeke¹, David Fenyo¹

¹Institute for Systems Genetics and Department of Biochemistry and Molecular Pharmacology, New York University Langone School of Medicine, New York, NY 10016, USA.

|October 27, 2015

Resumen

Este resumen es generado por máquina.

Los investigadores descubrieron un nuevo gen, ORF0, en los retrotransposones humanos LINE-1. Esta proteína reguladora puede representar un gen en evolución reciente con potencial para integrarse con el ADN del huésped.

Más Videos Relacionados

Author Spotlight: A Novel Setup to Conduct Naturalistic Laboratory Experiments with Real Human Actors in Scenarios

Author Spotlight: A Novel Setup to Conduct Naturalistic Laboratory Experiments with Real Human Actors in Scenarios

Published on: August 4, 2023

Exploring the Use of Isolated Expressions and Film Clips to Evaluate Emotion Recognition by People with Traumatic Brain Injury

Exploring the Use of Isolated Expressions and Film Clips to Evaluate Emotion Recognition by People with Traumatic Brain Injury

Published on: May 15, 2016

Videos de Experimentos Relacionados

Last Updated: Mar 31, 2026

HPLC-based Assay to Monitor Extracellular Nucleotide/Nucleoside Metabolism in Human Chronic Lymphocytic Leukemia Cells

HPLC-based Assay to Monitor Extracellular Nucleotide/Nucleoside Metabolism in Human Chronic Lymphocytic Leukemia Cells

Published on: July 20, 2016

Author Spotlight: A Novel Setup to Conduct Naturalistic Laboratory Experiments with Real Human Actors in Scenarios

Author Spotlight: A Novel Setup to Conduct Naturalistic Laboratory Experiments with Real Human Actors in Scenarios

Published on: August 4, 2023

Exploring the Use of Isolated Expressions and Film Clips to Evaluate Emotion Recognition by People with Traumatic Brain Injury

Exploring the Use of Isolated Expressions and Film Clips to Evaluate Emotion Recognition by People with Traumatic Brain Injury

Published on: May 15, 2016

Área de la Ciencia:

La genómica
Biología molecular
Biología evolutiva

Sus antecedentes:

Las retrotransposones de línea son los motores clave de la evolución del genoma de los mamíferos.
Los elementos LINE-1 son abundantes y activos en el genoma humano.

Objetivo del estudio:

Identificar nuevos elementos funcionales dentro de las retrotransposones humanas LINE-1.
Caracterizar el nuevo marco de lectura abierto (ORF0) y su proteína codificada.

Principales métodos:

Análisis bioinformático de secuencias humanas LINE-1.
Identificación y caracterización de nuevos marcos de lectura abiertos.
Análisis de los posibles productos proteicos y sus funciones.

Principales resultados:

Un marco de lectura abierto previamente desconocido, designado ORF0, fue identificado en la hebra antisentido de LINE-1 humano.
ORF0 codifica una pequeña proteína reguladora.
Este gen de retrotransposón emergente puede fusionarse potencialmente con secuencias de huéspedes adyacentes.

Conclusiones:

El descubrimiento de ORF0 en elementos LINE-1 representa un hallazgo significativo en la biología del retrotransposón.
Este nuevo gen puede desempeñar un papel regulador y ofrece información sobre el nacimiento y la evolución de los genes.
La capacidad de ORF0 para fusionarse con secuencias de huéspedes destaca su potencial dinámico en la adaptación del genoma.