Abstract
INTRODUCTION
Cerebrovascular dysfunction occurs in Alzheimer’s disease (AD), impairing hemodynamic regulation. Large conductance Ca2+-activated K+ channels (BKCa) regulate cerebrovascular reactivity and are impaired in AD. BKCa activity depends on intracellular Ca2+ (Ca2+ sparks) and nitro-oxidative post-translational modifications. However, whether these mechanisms underlie BKCa impairment in AD remains unknown.
METHODS
Cerebral arteries from 5x-FAD and wild-type (WT) littermates were used for molecular biology, electrophysiology, ex vivo, and in vivo experiments.
RESULTS
Arterial BKCa activity is reduced in 5x-FAD via sex-dependent mechanisms: in males, there is lower BKα subunit expression and less Ca2+ sparks. In females, we observed reversible nitro-oxidative modification of BKCa. Further, BKCa is involved in hemodynamic regulation in WT mice, and its dysfunction is associated with vascular deficits in 5x-FAD.
DISCUSSION
Our data highlight the central role played by BKCa in cerebral hemodynamic regulation and that molecular mechanisms of its impairment diverge based on sex in 5x-FAD.
Highlights
Cerebral microvascular BKCa dysfunction occurs in both female and male 5x-FAD.
Reduction in BKα subunit protein and Ca2+ sparks drive the dysfunction in males.
Nitro-oxidative stress is present in females, but not males, 5x-FAD.
Reversible nitro-oxidation of BKα underlies BKCa dysfunction in female 5x-FAD.
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This post is Copyright: Josiane F. Silva,
Felipe D. Polk,
Paige E. Martin,
Stephenie H. Thai,
Andrea Savu,
Matthew Gonzales,
Allison M. Kath,
Michael T. Gee,
Paulo W. Pires | December 19, 2024