The role of superoxide dismutase SOD-1 in microbe-gut-brain interaction

肠道微生物在调节宿主生理代谢方面起着重要作用。近期 研究表明肠道微生物影响记忆形成和神经退行性疾病 显化。 然而，目前还不完全了解肠道微生物如何影响肠道-大脑。 沟通。线虫线虫的神经系统相对简单，会 容易地从培养皿中摄取微生物。因此，线虫是一个成熟的模型。 研究行为和宿主-微生物相互作用的神经基础的有机体。通过 结合这两个领域的研究，我们最近发现，超氧化物歧化酶-1 超氧化物歧化酶(SOD-1)是一种将超氧化物转化为危害较小的过氧化氢的酶，它作为一种活性物质 神经系统中的活性氧感受器，调节行为反应 对微生物来说。我们的数据表明了一种以前未知的超氧化物歧化酶-1的功能，并提示了一种潜在的 SOD-1在调节微生物诱导的肠脑通讯中的作用。 在目标1中，我们将确定细菌如何激活SOD-1。在目标2中，我们将确定神经肽是否 在肠道和神经系统之间发挥信号分子的作用，以调节 超氧化物歧化酶-1依赖反应。在目标3中，我们将定义SOD-1和谷氨酸能信号如何 调节对微生物的行为反应。拟议的工作将增进我们对 有好几种方法。我们的遗传模型将开辟一个新的研究领域 微生物在肠道-脑轴上诱导的通讯。此外，拟议的实验 将揭示新的SOD-1调控途径。我们的结果可能有助于阐明潜在的 老年人和神经退行性疾病患者肠道生物失调的机制 并可能导致确定潜在的治疗目标。

Gut microbes play an important role in regulating host physiology and metabolism. Recent studies indicate that gut microbes affect memory formation and neurodegenerative disease manifestation. However, it is not fully understood how gut microbes influence gut–brain communication. The nematode C. elegans has a relatively simple nervous system and will readily ingest microbes from a petri dish. Therefore, C. elegans is a well-established model organism for studying the neural basis of behaviors and host–microbe interactions. By combining the two areas of research, we recently discovered that superoxide dismutase-1 (SOD-1), an enzyme that converts superoxide to less harmful peroxide, acts as a reactive sensor of reactive oxygen species in the nervous system and regulates the behavioral response to microbes. Our data indicate a previously unknown function of SOD-1 and suggest a potential role for SOD-1 in regulating microbe-induced gut–brain communication. In aim 1, we will determine how bacteria activate SOD-1. In aim 2, we will determine whether a neuropeptide functions as a signaling molecule between the gut and the nervous system to modulate the SOD-1 dependent response. In aim 3, we will define how SOD-1 and glutamatergic signaling regulate behavioral response to microbes. The proposed work will advance our knowledge in several ways. Our genetic model will open up a new research area for understanding the microbe-induced communication at the gut–brain axis. In addition, the proposed experiments will unveil new regulatory pathways of SOD-1. Our results may help to elucidate the underlying mechanisms of gut dysbiosis among elderly adults and patients with neurodegenerative diseases and may lead to the identification of potential therapeutic target.