recording in vivo synchronous electrophysiological and calcium activity in mice

<meta charset="utf8"></head><body>Dispositivo flexível de gravação neural multirregional para pesquisa de epilepsia

Epilepsy is a common neurological condition characterized by recurrent seizures, which manifest as convulsions, sensory disturbances, and loss of consciousness1. The pathophysiological mechanisms underlying epilepsy are complex and involve multiple interconnected brain regions2,3. Recent advances in neuroimaging have shed light on the large-scale networks involved in epilepsy4,5. However, understanding of the intricate circuitry and network mechanisms underlying the generation and propagation of epilepsy remains limited, partly due to the insufficient application of multi-region neural recording techniques6. Therefore, developing a flexible, integrated method capable of simultaneously monitoring neural activity across disparate brain regions is imperative.
Electrophysiological recordings are conducted to capture seizures and determine the presence of epilepsy7. Except for recording electrophysiological activity, there is a growing emphasis on the precise calcium activity of specific&#160;neural populations in epilepsy studies8,9. Advancements in calcium indicator synthesis and various probe designs have prompted researchers to adopt fiber photometry for capturing changes in neuronal activity and neural substances within the brain10,11. The two independent methods of detecting neuronal activity, namely electrophysiology and fiber photometry recording, complement each other, facilitating a more comprehensive understanding of dynamic neuronal processes.
Additionally, synchronous recording and modulating neural activity are pivotal for gaining insights into the brain functioning at both network and cellular levels. This approach enables researchers to observe and manipulate the brain&#39;s complex processes in real-time. Optogenetics has emerged as an indispensable tool for probing neural signaling, owing to its distinctive ability for selective stimulation or inhibition12. Despite widespread applications of multi-site electrophysiological recording in neuroscience13, the integration of multi-region electrophysiological recording with fiber photometry and optogenetic manipulation remains limited. More importantly, current methods for fabricating and implanting multi-region electrodes lack flexibility14. These limitations hinder our capacity to dissect specific circuit functions and interactions across multiple regions. Here, we present a cost-effective and convenient multi-region in vivo recording approach that sheds light on neuronal processes across regions in kindling-induced seizures and other neuropsychiatric disorders.

<meta charset="utf8"></head><body>Autor em destaque: Desvendando a comunicação neural e as interações de circuito na saúde e na doença

Um método integrado para criar otérios eletrofisiológicos flexíveis e convenientes para gravação in vivo em várias regiões

Registro da atividade eletrofisiológica e de cálcio síncrona in vivo em camundongos

recording-vivo-synchronous-electrophysiological-calcium-activity

Research

JoVE Journal

Neuroscience

Recording In Vivo Synchronous Electrophysiological and Calcium Activity in Mice

35 visualizações. Para começar, implante os eletrodos de gravação e injete os vírus relevantes no crânio do camundongo. Depois de anestesiar os camundongos, conecte as fibras ópticas sequencialmente na ordem do local de gravação antes de inserir o estágio principal. Em seguida, defina o pulso de luz de 635 nanômetros com um ciclo de trabalho de 10% a 20 hertz e configure a estimulação da luz por 10 segundos durante a gravação.Defina a intensidade nas ponta...

Vídeo: Registro da atividade eletrofisiológica e de cálcio síncrona in vivo em camundongos

An Integrated Method for Crafting Flexible and Convenient Electrophysiological Optrodes for Multi-Region In Vivo Recording

Epilepsy is a neurological disorder characterized by synchronized abnormal discharges involving multiple brain regions. Focal lesions facilitate the propagation of epileptic signals through associated neural circuits. Therefore, in vivo recording of local field potential (LFP) from the critical brain regions is&#160;essential for deciphering the circuits involved in seizure propagation. However, current methods for electrode fabrication and implantation lack flexibility. Here, we present a handy device designed for electrophysiological recordings (LFPs and electroencephalography [EEG]) across multiple regions. Additionally, we seamlessly integrated optogenetic manipulation and calcium signaling recording with LFP recording. Robust after-discharges were observed in several separate regions during epileptic seizures, accompanied by increasing&#160;calcium signaling. The approach used in this study offers a convenient and flexible strategy for synchronous neural recordings across diverse regions of the brain. It holds the potential for advancing research on neurological disorders by providing insights into the neural profiles of multiple regions involved in these disorders.

We have developed a simplified and cost-effective approach for electrode fabrication and conducted recordings of signals across multiple regions in freely moving mice. Utilizing optogenetics, alongside multi-region electrophysiology and calcium signal recording, enabled the revelation of neuronal activities across regions in the seizure kindling model.

Epilepsy is a neurological disorder characterized by synchronized abnormal discharges involving multiple brain regions. Focal lesions facilitate the ...