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Updated: Aug 5, 2026
In Vivo Fiber-Coupled Pre-Clinical Confocal Laser-scanning Endomicroscopy (pCLE) of Hippocampal Capillaries in Awake Mice
Published on: April 21, 2023
Pericyte KATP channel hyperactivity redistributes cortical blood flow in a CADASIL mouse model
Danielle A Jeffrey1, Eric W Prince2, Niloufar Khakpour3
1Department of Anesthesiology, University of Colorado Anschutz Medical Campus, Aurora, CO, USA.
Insights
Brain aging involves impaired blood flow regulation. This study reveals how pericyte energy deficits disrupt microcirculation, causing uneven brain perfusion and contributing to cognitive decline.
Area of Science:
- Neuroscience
- Vascular Biology
- Aging Research
Background:
- Cerebral hemodynamic dysfunction drives unhealthy brain aging.
- Impaired microcirculatory reactivity causes uneven brain perfusion, increasing vulnerability in deeper regions and contributing to cognitive decline.
- The specific role of capillaries in these deficits is poorly understood.
Purpose of the Study:
- To investigate the role of capillaries in cerebral hemodynamic dysfunction during brain aging.
- To elucidate the mechanisms underlying impaired microcirculatory reactivity and deep-layer hypoperfusion.
- To identify potential therapeutic targets for age-related cognitive decline.
Main Methods:
- Spatial transcriptomics to analyze gene expression in specific brain layers.
- In vivo two-photon and three-photon imaging to measure layer-specific cerebral blood flow.
- Electrophysiology, ex vivo, and in silico approaches to study pericyte function and KATP channel activity.
Main Results:
- Downregulation of ATP-synthesizing genes indicates microvascular metabolic impairment and paralleled impaired pericyte bioenergetics.
- Reduced arteriolar-capillary tone and diminished deep-layer perfusion were observed.
- Hyperactive KATP channels in pericytes redistribute blood flow to superficial layers, causing deep-layer hypoperfusion.
Conclusions:
- Microvascular metabolic impairment and pericyte energy deficits disrupt spatial perfusion equalization.
- This loss of perfusion equalization contributes to deep-layer hypoperfusion and cognitive decline in aging.
- Targeting pericyte bioenergetics and KATP channel activity may represent a tractable approach to address age-related brain dysfunction.
Abstract:
Cerebral hemodynamic dysfunction is a key driver of unhealthy brain aging. Impaired microcirculatory reactivity leads to uneven perfusion, rendering deeper brain regions more vulnerable and thereby contributing to cognitive decline. Yet how capillaries contribute to these deficits remains poorly defined. Here we combined spatial transcriptomics with in vivo two-photon and three-photon imaging to measure layer-specific cerebral blood flow in control and small vessel disease model mice (CADASIL TgNotch3R169C). We found downregulation of ATP-synthesizing genes, indicating microvascular metabolic impairment that paralleled impaired pericyte bioenergetics. This energy deficit coincided with diminished tone in the arteriole-capillary transitional zone and reduced deep-layer perfusion. Complementary electrophysiology, ex vivo and in silico approaches, revealed that hyperactive KATP channels in pericytes drive a redistribution of cerebral blood flow toward superficial cortical layers. This loss of spatial perfusion equalization, despite preserved global flow, contributed to deep-layer hypoperfusion, establishing a previously underrecognized but tractable vascular function disrupted in aging pathology.
