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Metabolic basis of brain-like electrical signalling in bacterial communities

机译:细菌社区中脑状电信带的代谢基础

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Information processing in the mammalian brain relies on a careful regulation of the membrane potential dynamics of its constituent neurons, which propagates across the neuronal tissue via electrical signalling. We recently reported the existence of electrical signalling in a much simpler organism, the bacterium Bacillus subtilis. In dense bacterial communities known as biofilms, nutrient-deprived B.subtilis cells in the interior of the colony use electrical communication to transmit stress signals to the periphery, which interfere with the growth of peripheral cells and reduce nutrient consumption, thereby relieving stress from the interior. Here, we explicitly address the interplay between metabolism and electrophysiology in bacterial biofilms, by introducing a spatially extended mathematical model that combines the metabolic and electrical components of the phenomenon in a discretized reaction-diffusion scheme. The model is experimentally validated by environmental and genetic perturbations, and confirms that metabolic stress is transmitted through the bacterial population via a potassium wave. Interestingly, this behaviour is reminiscent of cortical spreading depression in the brain, characterized by a wave of electrical activity mediated by potassium diffusion that has been linked to various neurological disorders, calling for future studies on the evolutionary link between the two phenomena.
机译:哺乳动物脑中的信息处理依赖于仔细调节其组成神经元的膜潜在动力学,其通过电信号在神经元组织上传播。我们最近报道了在更简单的生物体中存在电信带,枯草芽孢杆菌。在称为生物膜的致密细菌群体中,菌落内部的营养缺乏的B.subtilis细胞使用电气通信来将应力信号传递到周边,其干扰外围细胞的生长并降低营养消耗,从而减轻了来自营养消耗的增长内部的。在这里,我们通过在离散化反应扩散方案中引入将现象的代谢和电气分量相结合的空间扩展的数学模型,明确地解决了细菌生物膜中的代谢和电生理学之间的相互作用。该模型由环境和遗传扰动进行实验验证,并确认代谢应力通过钾波通过细菌群传播。有趣的是,这种行为使脑中的皮质扩散抑郁复杂化,其特征在于由钾扩散介导的电活动波,这与各种神经疾病联系起来,呼吁未来研究两种现象之间的进化联系。

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