Inhibition of mTOR protects the blood-brain barrier in models of Alzheimer’s disease and vascular cognitive impairment

Candice E. Van Skike, Jordan B. Jahrling, Angela B. Olson, Naomi L. Sayre, Stacy A. Hussong, Zoltan Ungvari, James D. Lechleiter, Veronica Galvan

Research output: Contribution to journalArticle

26 Scopus citations

Abstract

An intact blood-brain barrier (BBB) limits entry of proinflammatory and neurotoxic bloodderived factors into the brain parenchyma. The BBB is damaged in Alzheimer’s disease (AD), which contributes significantly to the progression of AD pathologies and cognitive decline. However, the mechanisms underlying BBB breakdown in AD remain elusive, and no interventions are available for treatment or prevention. We and others recently established that inhibition of the mammalian/mechanistic target of rapamycin (mTOR) pathway with rapamycin yields significant neuroprotective effects, improving cerebrovascular and cognitive function in mouse models of AD. To test whether mTOR inhibition protects the BBB in neurological diseases of aging, we treated hAPP(J20) mice modeling AD and low-density lipoprotein receptor-null (LDLR−/−) mice modeling vascular cognitive impairment with rapamycin. We found that inhibition of mTOR abrogates BBB breakdown in hAPP(J20) and LDLR−/− mice. Experiments using an in vitro BBB model indicated that mTOR attenuation preserves BBB integrity through upregulation of specific tight junction proteins and downregulation of matrix metalloproteinase- 9 activity. Together, our data establish mTOR activity as a critical mediator of BBB breakdown in AD and, potentially, vascular cognitive impairment and suggest that rapamycin and/or rapalogs could be used for the restoration of BBB integrity. NEW & NOTEWORTHY This report establishes mammalian/ mechanistic target of rapamycin as a critical mediator of blood-brain barrier breakdown in models of Alzheimer’s disease and vascular cognitive impairment and suggests that drugs targeting the target of rapamycin pathway could be used for the restoration of blood-brain barrier integrity in disease states.

Original languageEnglish (US)
Pages (from-to)H693-H703
JournalAmerican Journal of Physiology - Heart and Circulatory Physiology
Volume314
Issue number4
DOIs
StatePublished - Apr 1 2018

Keywords

  • Blood-brain barrier
  • Brain endothelium
  • Cerebrovasculature
  • Mammalian/ mechanistic target of rapamycin
  • Rapamycin

ASJC Scopus subject areas

  • Physiology
  • Cardiology and Cardiovascular Medicine
  • Physiology (medical)

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