Quantitative relationship between cerebrovascular network and neuronal cell types in mice

Area of Science:

• Neuroscience
• Vascular Biology
• Cellular Biology

Background:

• The brain's energy demands necessitate a close relationship between its vasculature and diverse neuronal cell types.
• Understanding the spatial organization of cerebrovasculature, mural cells, and neurons across brain regions is crucial but largely unknown.
• Quantitative mapping of these relationships is essential for comprehending regional brain function and energy supply.

Purpose of the Study:

• To comprehensively map the quantitative relationships between the cerebrovasculature, capillary pericytes, and glutamatergic and GABAergic neurons in the adult mouse brain.
• To investigate variations in these spatial relationships across different brain regions, including cortical and subcortical areas.
• To identify correlations between vascular characteristics, pericyte density, and specific neuronal subtypes, such as parvalbumin-positive and nNOS-positive neurons.

Main Methods:

• Brain-wide mapping techniques were employed to analyze the spatial distribution of cerebrovasculature, capillary pericytes, and neuronal populations.
• Quantitative analysis defined the relationships between vascular properties (e.g., fluid conductance) and neuronal cell densities.
• Specific neuronal subtypes, including nNOS-positive (nNOS+) neurons and their subtypes, were identified and correlated with vascular and pericyte data.

Main Results:

• Primary motor and sensory cortices exhibit high densities of vasculature with high fluid conductance and abundant capillary pericytes.
• Association cortices show distinct correlations with neuronal subtypes, with positive correlations for parvalbumin-positive neurons and negative correlations for vasomotor nNOS-positive neurons.
• Thalamo-striatal areas connected to primary motor/sensory cortices also display high vasculature and pericyte densities, indicating substantial energy support for these processing regions.

Conclusions:

• The study provides a cellular-resolution resource for examining neurovascular-neuronal spatial relationships across the brain.
• Regional variations in vasculature and pericyte density correlate with specific neuronal populations and regional energy demands.
• This detailed mapping highlights the tailored energy support provided by the cerebrovasculature to different brain functional areas, including understudied subcortical regions.