Mechanisms of neurovascular coupling in awake animals

清醒动物神经血管耦合机制

• 批准号: RGPIN-2015-05734
• 负责人: Anderson, Christopher
• 金额: $ 2.04万
• 依托单位: University of Manitoba
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2015
• 资助国家: 加拿大
• 起止时间: 2015-01-01 至 2016-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=590607
• 关键词: Mechanisms; neurovascular; coupling; awake; animals

The brain has a high energy demand but virtually no reserve energy capacity. Therefore, it is highly dependent on constant blood and nutrient flow matched dynamically with local energy demand. This is accomplished by a process called functional hyperemia (FH). FH results from creation of molecular signals from active neurons that translate to increases in the lumen diameter of local blood supply vessels and increased blood flow. However, the molecular cell to cell signaling processes that regulate FH and its spatial coordination are poorly understood. My long-term vision is to gain a comprehensive understanding of the intercellular molecular signaling mechanisms responsible for translating neuronal energy need to coordinated local and distal changes in brain vascular lumen diameter and blood flow. We and others have contributed to a wealth of evidence that brain cells called astrocytes are capable of “listening” to synaptic neuronal activity and reacting by sending vasodilatory signals to the local vasculature to increase blood flow. The role of astrocytes in genesis and spatial conduction of FH will be an overarching focus of our short term program objectives. Short term objectives (~5 years) are to:

大脑有很高的能量需求，但实际上没有储备能量能力。 因此，它高度依赖于与当地能量需求动态匹配的恒定血液和营养流动。 这是通过称为功能性充血 (FH) 的过程来完成的。 FH 是由活跃神经元产生分子信号引起的，这些信号转化为局部供血血管管腔直径的增加和血流量的增加。 然而，人们对调节 FH 的分子细胞间信号传导过程及其空间协调知之甚少。 我的长期愿景是全面了解负责将神经元能量需求转化为协调脑血管腔直径和血流的局部和远端变化的细胞间分子信号传导机制。 我们和其他人提供了大量证据，证明称为星形胶质细胞的脑细胞能够“聆听”突触神经元活动，并通过向局部脉管系统发送血管舒张信号来增加血流量来做出反应。 星形胶质细胞在 FH 发生和空间传导中的作用将是我们短期计划目标的首要焦点。 短期目标（~5 年）是：