Neurovascular coupling and CO2 interrogate distinct vascular regulations

Marine Tournissac (), Emmanuelle Chaigneau, Sonia Pfister, Ali-Kemal Aydin, Yannick Goulam Houssen, Philip O’Herron, Jessica Filosa, Mayeul Collot, Anne Joutel and Serge Charpak ()
Additional contact information
Marine Tournissac: Vision Institute
Emmanuelle Chaigneau: Vision Institute
Sonia Pfister: Université de Strasbourg
Ali-Kemal Aydin: Vision Institute
Yannick Goulam Houssen: Vision Institute
Philip O’Herron: Augusta University
Jessica Filosa: Augusta University
Mayeul Collot: Université de Strasbourg
Anne Joutel: Institute of Psychiatry and Neuroscience of Paris (IPNP), INSERM U1266
Serge Charpak: Vision Institute

Nature Communications, 2024, vol. 15, issue 1, 1-12

Abstract: Abstract Neurovascular coupling (NVC), which mediates rapid increases in cerebral blood flow in response to neuronal activation, is commonly used to map brain activation or dysfunction. Here we tested the reemerging hypothesis that CO2 generated by neuronal metabolism contributes to NVC. We combined functional ultrasound and two-photon imaging in the mouse barrel cortex to specifically examine the onsets of local changes in vessel diameter, blood flow dynamics, vascular/perivascular/intracellular pH, and intracellular calcium signals along the vascular arbor in response to a short and strong CO2 challenge (10 s, 20%) and whisker stimulation. We report that the brief hypercapnia reversibly acidifies all cells of the arteriole wall and the periarteriolar space 3–4 s prior to the arteriole dilation. During this prolonged lag period, NVC triggered by whisker stimulation is not affected by the acidification of the entire neurovascular unit. As it also persists under condition of continuous inflow of CO2, we conclude that CO2 is not involved in NVC.

Date: 2024
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DOI: 10.1038/s41467-024-49698-9

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