Neurovascular Coupling in the Dentate Gyrus Regulates Adult Hippocampal Neurogenesis.

Jia Shen, Depeng Wang, Xinxing Wang, Shashank Gupta, Bhargav Ayloo, Song Wu, Paras Prasad, Qiaojie Xiong, Jun Xia, Shaoyu Ge

Neuron 2019 Sep 04

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Newborn dentate granule cells (DGCs) are continuously generated in the adult brain. The mechanism underlying how the adult brain governs hippocampal neurogenesis remains poorly understood. In this study, we investigated how coupling of pre-existing neurons to the cerebrovascular system regulates hippocampal neurogenesis. Using a new in vivo imaging method in freely moving mice, we found that hippocampus-engaged behaviors, such as exploration in a novel environment, rapidly increased microvascular blood-flow velocity in the dentate gyrus. Importantly, blocking this exploration-elevated blood flow dampened experience-induced hippocampal neurogenesis. By imaging the neurovascular niche in combination with chemogenetic manipulation, we revealed that pre-existing DGCs actively regulated microvascular blood flow. This neurovascular coupling was linked by parvalbumin-expressing interneurons, primarily through nitric-oxide signaling. Further, we showed that insulin growth factor 1 signaling participated in functional hyperemia-induced neurogenesis. Together, our findings revealed a neurovascular coupling network that regulates experience-induced neurogenesis in the adult brain. Copyright © 2019 Elsevier Inc. All rights reserved.

Citation

Jia Shen, Depeng Wang, Xinxing Wang, Shashank Gupta, Bhargav Ayloo, Song Wu, Paras Prasad, Qiaojie Xiong, Jun Xia, Shaoyu Ge. Neurovascular Coupling in the Dentate Gyrus Regulates Adult Hippocampal Neurogenesis. Neuron. 2019 Sep 04;103(5):878-890.e3