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Blood Pressure Regulates Functional Coupling of L-Type Ca2+ Channels: Reimaging the Foundation of Cerebral Blood Flow Control
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Blood Pressure Regulates Functional Coupling of L-Type Ca2+ Channels: Reimaging the Foundation of Cerebral Blood Flow Control
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Paper
Blood Pressure Regulates Functional Coupling of L-Type Ca2+ Channels: Reimaging the Foundation of Cerebral Blood Flow Control
2026
Overview
The myogenic response is the key autoregulatory mechanism setting cerebral blood flow and its mechanistic foundation is intimately tied to depolarization and the voltage gating of L-type Ca2+ channels (CaV1.2). While critical, this study argues for an additional mechanism, that of pressure itself enhancing CaV1.2 activity via cooperative gating and perimembrane trafficking of channel's subunits. These novel insights were pursued at the cell level using patch-clamp electrophysiology and advanced microscopy, and then functionally in pressurized arteries through measures of tone and intracellular [Ca2+]i. Key findings were confirmed in mutant mice with disrupted functional coupling and translated into arteries procured from human brain tissue. From cerebral blood flow simulations of semi-realistic microvascular networks, we predict that loss of this alternative mechanism leads to maldistribution of brain blood flow and potentially a diminishment of cognitive function. This study reveals previously unrecognized pressure-sensitive CaV1.2 regulatory mechanism that advances understanding of cerebral blood flow.Competing Interest StatementThe authors have declared no competing interest.Footnotes* https://github.com/mccsssk2/Mironova_et_al_20242025\\* https://github.com/Franculino/microBlooMFunder Information DeclaredCanadian Institutes of Health Research, RN452347 - 462379Swiss National Science Foundation, 200703, 202199Hartmann Muller Foundation, 2885
Publisher
Cold Spring Harbor Laboratory Press
