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Modeling traumatic brain injury in vitro: Functional changes in the absence of cell death

机译:体外模拟颅脑外伤:在没有细胞死亡的情况下功能改变

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Traumatic brain injury (TBI) is caused by in response to mechanical loading of the head. An extended biological cascade is initiated by the deformation and results in delayed cell death and dysfunction. Using an in vitro model of TBI based on organotypic brain slice cultures, we have quantitatively studied the relationship between tissue deformation and outcome. In the current study, we asked the question whether low levels of tissue strain would affect brain tissue function as measured by electrophysiological recordings. In response to 5% and 10% biaxial Lagrangian strain the maximal evoked response was decreased and the current to elicit a half maximal response was increased. These results indicate that less neurons were firing in response to an electrical stimulus and that they were less excitable. These results suggest that functional alterations of neuronal networks occurs at lower strains than those required to induce cell death.
机译:颅脑外伤是由于头部机械负荷引起的。变形引发了扩展的生物级联反应,并导致延迟的细胞死亡和功能障碍。使用基于器官型脑切片培养物的TBI体外模型,我们定量研究了组织变形与预后之间的关系。在当前的研究中,我们提出了一个问题,即低水平的组织张力是否会影响通过电生理记录测量的脑组织功能。响应5%和10%的双轴拉格朗日应变,最大诱发反应降低,引起最大反应一半的电流增加。这些结果表明响应电刺激放电的神经元较少,并且兴奋性较低。这些结果表明,神经元网络的功能改变发生在比诱导细胞死亡所需的应变更低的应变下。

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