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A synapse is a specialized structure where two neurons connect, allowing them to pass an electrical or chemical signal to another neuron. It is the point of communication between neurons. The term "synapse" is derived from the Greek word "synapsis," which means "conjunction." The entire process of neural communication revolves around the synapse. When activated, a neuron releases chemicals known as neurotransmitters into the synapse. These neurotransmitters cross the synapse and bind to...
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Gap Junctions01:27

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The cytoplasm of adjacent animal cells can exchange small molecules, ions, and secondary messengers via the communication channels which form the gap junctions. These junctions comprise a few hundred to thousands of molecular channels, each made of two halves, called the connexon hemichannel. A connexon is a hexamer of six transmembrane connexin proteins, which assemble radially, thus forming a pore or channel in the center. One connexon hemichannel docks with a corresponding connexon on the...
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Electrical Synapses01:28

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Electrical synapses found in all nervous systems play important and unique roles. In these synapses, the presynaptic and postsynaptic membranes are very close together (3.5 nm) and are actually physically connected by channel proteins forming gap junctions.
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Synaptic Signaling01:09

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Neurons communicate at synapses, or junctions, to excite or inhibit the activity of other neurons or target cells, such as muscles. Synapses may be chemical or electrical.
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Arrhythmias are irregular heart rhythms occurring when the heart's electrical impulses become abnormal. These disturbances can lead to various symptoms, depending on their severity and the underlying cause. Some common factors contributing to arrhythmias include hypoxia, ischemia, electrolyte imbalances, excessive catecholamine exposure, drug toxicity, and muscle overstretching. Arrhythmias can be classified into two main types based on the rate and site of origin of abnormal heart rhythms.
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The nervous system consists of complex motor neuron circuits, including upper motor neurons originating from the cerebral cortex and lower motor neurons starting in the spinal cord, coordinating both voluntary and involuntary movements. Among these, somatic motor neurons activate skeletal muscles and are classified into alpha, beta, and gamma types. Alpha neurons are vital for voluntary movement coordination, while gamma neurons adjust muscle spindle sensitivity, and the function of beta...
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Electrophysiological Recordings from the Giant Fiber Pathway of D. melanogaster
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Las uniones de brecha desincronizan un circuito neuronal para estabilizar el vuelo de los insectos

Silvan Hürkey1, Nelson Niemeyer2, Jan-Hendrik Schleimer2

  • 1Institute of Developmental Biology and Neurobiology (iDN), Johannes Gutenberg-University Mainz, Mainz, Germany.

Nature
|May 24, 2023
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Resumen

Los investigadores descubrieron un nuevo circuito neuronal para el vuelo asincrónico de los insectos, revelando que las débiles sinapsis eléctricas desincronizan la actividad neuronal para una potencia de ala estable. Este hallazgo desafía las suposiciones anteriores sobre la sincronización neuronal en el control motor.

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Área de la Ciencia:

  • La neurociencia
  • La biofísica
  • Fisiología de los insectos

Sus antecedentes:

  • El vuelo asincrónico de los insectos es crucial para la locomoción en más de 600.000 especies.
  • Si bien se entienden los patrones motores, la biomecánica y la aerodinámica, la arquitectura y la función de la red neuronal de generación de patrones centrales (CPG) siguen siendo escurridizas.

Objetivo del estudio:

  • Para aclarar la arquitectura y la función de la red neuronal CPG subyacente vuelo asíncrono de insectos.
  • Identificar los mecanismos de circuito responsables de la generación de patrones de motor rítmico para el control de vuelo.

Principales métodos:

  • Combinación de electrofisiología, optofisiología y genética de Drosophila.
  • Empleado el modelado matemático para analizar la dinámica de la red neuronal.
  • Investigó el papel de las sinapsis eléctricas en la función CPG.

Principales resultados:

  • Identificó un circuito CPG miniaturizado con motoneuronas interconectadas por sinapsis eléctricas.
  • Demostró que las sinapsis eléctricas débiles, contrariamente a las expectativas, desincronizan la actividad de la red.
  • Mostró un mecanismo genérico para la desincronización de la red dependiente de la excitabilidad de las neuronas y la fuerza de las sinapsis.
  • Confirmado este mecanismo de desincronización traduce la entrada sin patrón en el disparo neuronal estereotipado para una potencia de ala estable.
  • Encontré que este mecanismo se conserva en múltiples especies de insectos.

Conclusiones:

  • Las sinapsis eléctricas exhiben una mayor versatilidad funcional en el control del circuito neuronal de lo que se pensaba anteriormente.
  • El mecanismo de desincronización identificado es clave para la generación de energía de ala estable en vuelo asincrónico.
  • Destaca la importancia de la detección de sinapsis eléctricas en la investigación de la conectividad para comprender los circuitos neuronales.