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Capillary-associated microglia regulate vascular structure and function through PANX1-P2RY12 coupling in mice.

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Brain microglia interact with capillaries, regulating blood flow and vessel function. Purines released via PANX1 channels activate microglial P2RY12 receptors, impacting neurovascular health.

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Area of Science:

  • Neuroscience
  • Immunology
  • Vascular Biology

Background:

  • Microglia, brain immune cells, have poorly understood interactions with brain vasculature.
  • Their role in regulating vascular physiology requires further investigation.

Purpose of the Study:

  • To characterize capillary-associated microglia (CAMs) and their interactions with brain capillaries.
  • To elucidate the molecular mechanisms regulating CAMs and their impact on neurovascular function.

Main Methods:

  • Molecular, morphological, and ultrastructural analysis of microglia.
  • Spatio-temporal characterization of CAMs versus parenchymal microglia (PCMs).
  • Investigation using P2RY12 knockout and PANX1 knockout mouse models.

Main Results:

  • Identified ramified CX3CR1+ myeloid cells interacting with brain capillaries as bona fide microglia.
  • Demonstrated P2RY12 receptors regulate CAM interactions, controlled by purines from PANX1 channels.
  • Microglial depletion caused capillary dilation, increased blood flow, and impaired vasodilation, mimicking knockout models.

Conclusions:

  • Capillary-associated microglia play a critical role in regulating cerebral blood flow and vascular tone.
  • Purinergic signaling via PANX1 channels and P2RY12 receptors is essential for microglial regulation of neurovascular function.