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Neurovascular coupling develops alongside neural circuits in the postnatal brain.

Mariel G Kozberg1, Elizabeth M C Hillman2

  • 1Laboratory for Functional Optical Imaging, Departments of Biomedical Engineering and Radiology, Mortimer B. Zuckerman Mind Brain Behavior Institute and Kavli Institute for Brain Science, Columbia University, New York, NY, USA; Department of Medicine, Massachusetts General Hospital, Boston, MA, USA.

Neurogenesis (Austin, Tex.)
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PubMed
Summary

Neurovascular coupling, the link between neural activity and blood flow, differs in newborn brains. This study reveals immature brains lack coupled blood flow, leading to oxygen depletion and impacting brain development.

Keywords:
GCaMP imagingbrain hemodynamicsfMRIneurovascular couplingoxygen metabolismpostnatal neural development

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Physiology

Background:

  • Neurovascular coupling links neural activity and blood flow, crucial for functional magnetic resonance imaging (fMRI).
  • This coupling is assumed consistent from birth, but early postnatal brains exhibit different hemodynamics.

Purpose of the Study:

  • To investigate if differing hemodynamics in immature brains stem from spatiotemporal neural activity properties.
  • To understand the neurovascular and neurometabolic environment of the developing brain.

Main Methods:

  • Utilized wide-field optical imaging in mice to simultaneously visualize neural activity and hemodynamics.
  • Observed neural responses and brain blood flow, oxygenation, and metabolism during cortical development.

Main Results:

  • Neural responses became longer and more complex as cortical connectivity developed.
  • Newborn brains showed an absence of coupled blood flow responses to neural activation.
  • This decoupling resulted in oxygen depletions post-activation.

Conclusions:

  • Immature brains have distinct neurovascular coupling, characterized by a lack of immediate blood flow response.
  • Oxygen depletions in newborns may influence neural response duration and vascular development.
  • Findings offer new interpretations for fMRI BOLD studies in early brain development.