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Neural and hemodynamic responses to optogenetic and sensory stimulation in the rat somatosensory cortex

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Title
Neural and hemodynamic responses to optogenetic and sensory stimulation in the rat somatosensory cortex
Author(s)
Iordanova B.; Vazquez A.L.; Poplawsky A.J.; Fukuda M.; Seong-Gi Kim
Publication Date
2015-06
Journal
JOURNAL OF CEREBRAL BLOOD FLOW AND METABOLISM, v.35, no.6, pp.922 - 932
Publisher
NATURE PUBLISHING GROUP
Abstract
Introducing optogenetics into neurovascular research can provide novel insights into the cell-specific control of the hemodynamic response. To generalize findings from molecular approaches, it is crucial to determine whether light-activated circuits have the same effect on the vasculature as sensory-activated ones. For that purpose, rats expressing channelrhodopsin (ChR2) specific to excitatory glutamatergic neurons were used to measure neural activity, blood flow, hemoglobin-based optical intrinsic signal, and blood oxygenation level-dependent (BOLD) functional magnetic resonance imaging (fMRI) during optogenetic and sensory stimulation. The magnitude of the evoked hemodynamic responses was monotonically correlated with optogenetic stimulus strength. The BOLD hemodynamic response function was consistent for optogenetic and sensory stimuli. The relationship between electrical activities and hemodynamic responses was comparable for optogenetic and sensory stimuli, and better explained by the local field potential (LFP) than the firing rate. The LFP was well correlated with cerebral blood flow, moderately with cerebral blood volume, and less with deoxyhemoglobin (dHb) level. The presynaptic firing rate had little impact on evoking vascular response. Contribution of the postsynaptic LFP to the blood flow response induced by optogenetic stimulus was further confirmed by the application of glutamate receptor antagonists. Overall, neurovascular coupling during optogenetic control of glutamatergic neurons largely conforms to that of a sensory stimulus. © 2015 ISCBFM
URI
https://pr.ibs.re.kr/handle/8788114/1685
ISSN
0271-678X
Appears in Collections:
Center for Neuroscience Imaging Research (뇌과학 이미징 연구단) > Journal Papers (저널논문)
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