Video Experimental Relacionado
Updated: Oct 14, 2026
08:38
Vibrodissociation of Neurons from Rodent Brain Slices to Study Synaptic Transmission and Image Presynaptic Terminals
Published on: May 25, 2011
La mejora inducida por el ruido de la transducción de la señal a través de canales iónicos dependientes de la tensión
1Division of Computer Research and Technology, National Institutes of Health, Bethesda, Maryland 20892-0580, USA.
Nature
|November 23, 1995
Resumen
El ruido puede mejorar sorprendentemente la detección de señales biológicas. Este estudio demuestra la resonancia estocástica en canales iónicos simples, mostrando cómo el ruido amplifica pequeñas señales a nivel subcelular.
Área de la Ciencia:
- La biofísica es la biofísica.
- Biología de Sistemas Biología de Sistemas.
- La bioquímica es la bioquímica.
Sus antecedentes:
- Los sistemas de transducción de señales generalmente se basan en minimizar el ruido para una transferencia de información confiable.
- Los sistemas no lineales pueden aprovechar el ruido para mejorar el rendimiento, un fenómeno conocido como resonancia estocástica.
- La resonancia estocástica se ha observado en sistemas biológicos complejos, pero su aparición a nivel subcelular sigue sin estar clara.
Objetivo del estudio:
- Para investigar el potencial de la resonancia estocástica a nivel subcelular.
- Para determinar si los sistemas biológicos simples como los canales iónicos pueden exhibir transducción de señal mejorada por ruido.
- Explorar el papel de la resonancia estocástica en la amplificación de pequeñas señales en ambientes biológicos ruidosos.
Principales métodos:
- Utilizó un sistema de canales iónicos dependientes de voltaje formados por el péptido alameticina.
- Ruido externo aplicado al sistema de canales iónicos.
- Transducción de señal medida y relación señal-ruido de salida en respuesta a diferentes niveles de ruido.
Principales resultados:
- Resonancia estocástica observada en el sistema de canales iónicos de la alameticina.
- Demostró un aumento de cien veces en la transducción de la señal cuando se introdujo ruido externo.
- Mostró un aumento simultáneo en la relación señal-ruido de salida, lo que indica una detección de señal mejorada.
Conclusiones:
- La resonancia estocástica puede ocurrir a nivel subcelular en los sistemas biológicos.
- El sistema de canales iónicos de la alameticina representa el sistema biológico conocido más simple que exhibe resonancia estocástica.
- El ruido puede desempeñar un papel crucial en la mejora de la detección y amplificación de señales en los sistemas biológicos, incluso a nivel molecular.
Más Videos Relacionados
Videos de Conceptos Relacionados
01:24Non-gated Ion Channels
Ion channels are specialized proteins on the plasma membrane that allow charged ions to pass down their electrochemical gradient. Their main function is to maintain the membrane potential which is critical for cell viability. These channels are either gated or non-gated and can transport more than a thousand ions within milliseconds for the cellular event to occur.
Compared to the gated ion channels, the non-gated channels, also known as leakage or passive channels, have no gating mechanism.
Compared to the gated ion channels, the non-gated channels, also known as leakage or passive channels, have no gating mechanism.
01:19The Role of Ion Channels in Neuronal Computation
A postsynaptic neuron usually receives numerous impulses from several other presynaptic neurons. The axon hillock of the postsynaptic neuron integrates all these signals and determines the likelihood of firing an action potential.
Sometimes a single EPSP is strong enough to induce an action potential in the postsynaptic neuron. However, multiple presynaptic inputs must often create EPSPs around the same time for the postsynaptic neuron to be sufficiently depolarized to fire an action potential.
Sometimes a single EPSP is strong enough to induce an action potential in the postsynaptic neuron. However, multiple presynaptic inputs must often create EPSPs around the same time for the postsynaptic neuron to be sufficiently depolarized to fire an action potential.
01:26Voltage-gated Ion Channels
Voltage-gated ion channels are transmembrane proteins that open and close in response to changes in the membrane potential. They are present on the membranes of all electrically excitable cells such as neurons, heart, and muscle cells.
Generally, all voltage-gated ion channels have a 'voltage-sensing domain' that spans the lipid bilayer. The charged residues in the sensor move in response to the membrane potential changes that open the channel allowing ions movement. There are several types of...
Generally, all voltage-gated ion channels have a 'voltage-sensing domain' that spans the lipid bilayer. The charged residues in the sensor move in response to the membrane potential changes that open the channel allowing ions movement. There are several types of...
01:12Mechanically-gated Ion Channels
Mechanically-gated ion channels are proteins found in eukaryotic and prokaryotic cell membranes that open in response to mechanical stress. Tension, compression, swelling, and shear stress can alter the conformation of the protein, opening a transmembrane channel that allows the passage of ions for signal transmission. In eukaryotes, mechanically-gated channels are distributed in several regions like the neurons, lungs, skin, bladder, and heart, where they play critical roles in numerous...
01:21G-Protein Gated Ion Channels
GPCRs are primarily responsible for our sense of smell, taste, and vision. The binding of a sensory stimulus activates GPCR to stimulate effector proteins, many of which are ion channels in the sensory organs. GPCRs modulate the opening and closing of the target ion channels either directly by binding them, or by releasing second messengers that activate these channels. As ions move across the membrane, the membrane potential is altered, which induces an appropriate response.
Sensory organs,...
Sensory organs,...
01:30Ligand-Gated Ion Channel Receptor: Gating Mechanism
Ligand-gated ion channels are transmembrane proteins that play a vital role in intercellular communication and functions of the nervous system. They allow the influx of ions across the membrane once the neurotransmitter binds, allowing the subsequent transmission of electrical excitation across the neurons. Other ligand-gated ion channels, like the γ-aminobutyric acid (GABA) receptor, permit anions like chloride into the cells on the binding of the GABA molecule. Their entry into the cell...