Video Experimental Relacionado
Updated: Jan 20, 2026
07:50
Electrophysiology of Scorpion Peg Sensilla
Published on: April 13, 2011
9.4K
Una toxina de escorpión que penetra en las células permite la modulación específica del TRPA1 y el dolor
John V Lin King1, Joshua J Emrick2, Mark J S Kelly3
1Department of Physiology, University of California, San Francisco, San Francisco, CA 94143, USA; Neuroscience Graduate Program, University of California, San Francisco, San Francisco, CA 94143, USA.
Cell
|August 27, 2019
Resumen
Una nueva toxina de escorpión, WaTx, activa el canal iónico TRPA1 desde el interior de la célula, causando dolor sin inflamación. Esto revela una evolución convergente en la forma en que los irritantes se dirigen a los canales TRPA1.
Área de la Ciencia:
- La neurociencia
- Biología molecular
- Farmacología
Sus antecedentes:
- TRPA1 (Transient Receptor Potential Ankyrin 1) es un sensor crítico para las sustancias irritantes.
- La activación generalmente implica la modificación covalente de los residuos de cisteína intracelular por electrófilos.
- Este proceso desencadena dolor y inflamación neurogénica.
Objetivo del estudio:
- Investigar el mecanismo de acción de una nueva toxina peptídica de escorpión (WaTx) sobre el TRPA1.
- Para determinar si WaTx se dirige al mismo sitio intracelular que los irritantes electrófilos.
- Caracterizar las consecuencias funcionales de la activación de TRPA1 inducida por WaTx.
Principales métodos:
- Pruebas bioquímicas para evaluar la modificación de TRPA1.
- Registros electrofisiológicos para medir la actividad del canal.
- Estudios in vivo para evaluar las respuestas al dolor y la inflamación neurogénica.
Principales resultados:
- WaTx penetra en la membrana celular para acceder al sitio de activación de TRPA1 intracelular.
- WaTx induce un estado activo distinto con aberturas prolongadas y baja permeabilidad de Ca2+.
- WaTx provoca dolor agudo e hipersensibilidad pero no inflamación neurogénica.
Conclusiones:
- WaTx proporciona una herramienta única para estudiar la función del canal TRPA1.
- La evolución convergente permite que irritantes químicamente diversos modulen el TRPA1 a través del mismo sitio alostérico.
- La activación diferencial de TRPA1 por WaTx y electrófilos ofrece información sobre las vías del dolor y la inflamación.
Videos de Conceptos Relacionados
01:36Types of Toxins
3.2K
Humans continually engage with an environment rich in potentially harmful chemicals. These are introduced to our bodies through inhalation, ingestion, or skin contact. These chemicals exist in various forms, such as air and environmental pollutants, agricultural chemicals, organic solvents, and heavy metals.
Air pollutants, primarily gases, pose significant threats to respiratory health, leading to conditions like hypoxia, lung cancer, and in extreme cases, death.
Environmental pollutants like...
Air pollutants, primarily gases, pose significant threats to respiratory health, leading to conditions like hypoxia, lung cancer, and in extreme cases, death.
Environmental pollutants like...
3.2K
01:07What is a Mode?
25.1K
The mode is one of the commonly used measures of a central tendency. It is defined as the most frequent value in a data set.
There can be more than one mode in a data set if multiple values have the same highest frequency. For instance, suppose that the Statistics exam scores of 20 students are: 50; 53; 59; 59; 63; 63; 72; 72; 72; 72; 72; 76; 78; 81; 83; 84; 84; 84; 90; 93. Here, the mode is 72, as it occurs most frequently, five times.
A data set with two modes is called bimodal. For example,...
There can be more than one mode in a data set if multiple values have the same highest frequency. For instance, suppose that the Statistics exam scores of 20 students are: 50; 53; 59; 59; 63; 63; 72; 72; 72; 72; 72; 76; 78; 81; 83; 84; 84; 84; 90; 93. Here, the mode is 72, as it occurs most frequently, five times.
A data set with two modes is called bimodal. For example,...
25.1K
01:58Cell Specific Gene Expression
16.3K
Multicellular organisms contain a variety of structurally and functionally distinct cell types, but the DNA in all the cells originated from the same parent cells. The differences in the cells can be attributed to the differential gene expression. Liver cells, whose functions include detoxification of blood, production of bile to metabolize fats, and synthesis of proteins essential for metabolism, must express a specific set of genes to perform their functions. Gene expression also varies with...
16.3K
01:14Ventilatory Modes
1.4K
Mechanical ventilators are life-saving devices that support or replace spontaneous breathing. They deliver breaths to patients through varying methods known as ventilator modes. Understanding these modes is critical for healthcare providers managing patients with respiratory failure.
There are three ventilatory modes: full support, partial support, and spontaneous. These are described below.
Full Support Modes
Full support modes include controlled mechanical ventilation, continuous mandatory...
There are three ventilatory modes: full support, partial support, and spontaneous. These are described below.
Full Support Modes
Full support modes include controlled mechanical ventilation, continuous mandatory...
1.4K
01:20Pain
1.3K
Pain serves as a critical warning signal that alerts the body to potential or actual harm. When mechanical pressure on the skin is intense, such as from a sharp pinch, the sensation transitions from touch to pain. Similarly, extreme temperatures, like a hot pot handle, convert the sensation of heat into pain. Pain can also result from overstimulation of other senses, such as blinding light, loud noise, or the intense heat from habañero peppers. This ability to sense pain is essential for...
1.3K
01:22MOSFET: Enhancement Mode
801
Enhancement-mode MOSFETs are pivotal components in electronics, distinguished by their capacity to act as highly efficient switches. They are part of the larger family of metal-oxide Semiconductor Field-Effect Transistors (MOSFETs). They are available in two types: p-channel and n-channel, each tailored to specific polarity operations.
In their basic form, enhancement-mode MOSFETs are typically non-conductive when the gate-source voltage (Vgs) is zero. This default 'off' state means no...
In their basic form, enhancement-mode MOSFETs are typically non-conductive when the gate-source voltage (Vgs) is zero. This default 'off' state means no...
801