Faculty, Staff and Student Publications

Language

English

Publication Date

6-1-2025

Journal

GeroScience

DOI

10.1007/s11357-025-01526-8

PMID

39843732

PMCID

PMC12181614

PubMedCentral® Posted Date

1-22-2025

PubMedCentral® Full Text Version

Post-print

Abstract

Alzheimer’s disease (AD) is a neurodegenerative disorder that affects more than 6.2 million Americans aged 65 and older, particularly women. Along with AD’s main hallmarks (formation of β-amyloid plaques and tau neurofibrillary tangles), there are vascular alterations that occurs in AD pathology. Adenosine A2 receptor (A2AR) is one of the key factors of brain vascular autoregulation and is overexpressed in AD patients. Our previous findings suggest that protein arginine methyltransferase 4 (PRMT4) is overexpressed in AD, which leads to decrease in cerebral blood flow in aged female 3xTg mice. We aimed to investigate the mechanism behind A2AR signaling in the regulation of brain perfusion and blood–brain barrier integrity in age and sex-dependent 3xTg mice, and if it is related to PRMT4. Istradefylline, a highly selective A2AR antagonist, was used to modulate A2AR signaling. Aged female 3xTg and C57BL/6 J mice were evaluated for brain perfusion (via laser speckle) and cognitive function (via open field, T-maze and novel object recognition). Our results suggest that modulation of A2AR signaling in aged female 3xTg increased cerebral perfusion by decreasing PRMT4 expression, restored the levels of APP and tau, maintained blood–brain barrier integrity by maintaining the expression of tight junction proteins, and preserved functional learning/memory.

Keywords

Animals, Alzheimer Disease, Disease Models, Animal, Mice, Female, Cerebrovascular Circulation, Adenosine A2 Receptor Antagonists, Cognition, Mice, Inbred C57BL, Blood-Brain Barrier, Mice, Transgenic, Receptor, Adenosine A2A, Purines, Male, Protein-Arginine N-Methyltransferases, Brain, Alzheimer's Disease, Adenosine A2 Receptor, Protein Arginine Methyltransferase 4, Brain Perfusion

Published Open-Access

yes

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