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Pericyte pannexin1 controls cerebral capillary diameter and supports memory function.

Sandra Mai-Morente1, Eugenia Isasi2, Alberto Rafael1

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Pannexin1 (Panx1) channels in brain pericytes control blood vessel diameter by regulating ATP release. This finding reveals Panx1 as a key regulator of cerebral blood flow and a potential target for cognitive disorders.

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Area of Science:

  • Neuroscience
  • Vascular Biology
  • Cell Physiology

Background:

  • Cerebral pericytes regulate blood-brain barrier function and neuro-metabolic supply.
  • The molecular mechanisms controlling pericyte contractility and cerebral blood flow are not fully understood.

Purpose of the Study:

  • To investigate the role of pannexin1 (Panx1) channels in mouse cerebral pericytes.
  • To elucidate the function of Panx1 in regulating cerebral capillary diameter and brain function.

Main Methods:

  • Utilized mouse models with genetic deletion or pharmacological inhibition of Panx1.
  • Performed electrophysiology and calcium imaging in hippocampal slices.
  • Assessed capillary diameter changes and memory performance in vivo.

Main Results:

  • Mouse cerebral pericytes express functional Panx1 channels mediating ATP release.
  • Pericyte Panx1 activity regulates capillary diameter in response to ATP and synaptic activity.
  • Inhibition or genetic deletion of Panx1 alters cerebral capillary dynamics and impairs learning-related memory.

Conclusions:

  • Pericyte Panx1 channels are critical regulators of cerebral capillary diameter and blood flow.
  • Panx1 activity is modulated by glutamatergic and purinergic receptors, influencing pericyte calcium signaling.
  • Pericyte Panx1 represents a potential therapeutic target for cerebrovascular and cognitive disorders.