Ageing research reviewsJul 18, 2026

Aging of brain blood vessel support cells linked to blood-brain barrier problems in Alzheimer's disease: causes, effects, and treatment possibilities

Longevity & Aging Weekly Brief ↗PubMed ↗DOI ↗

Updated Jul 19, 2026

Abstract

Cellular senescence in the neurovascular unit may contribute to blood-brain barrier dysfunction in Alzheimer's disease.

Blood-brain barrier dysfunction is seen as an early event in Alzheimer's disease, potentially preceding cognitive decline.
Core cells of the neurovascular unit, including brain microvascular endothelial cells, pericytes, and astrocytes, may enter senescence under Alzheimer's-related conditions.
The senescence-associated secretory phenotype (SASP) factors released by senescent cells can disrupt blood-brain barrier junction proteins and transport systems.
Inflammatory mediators and immune cells may exacerbate Alzheimer's pathology by crossing the compromised blood-brain barrier.
Accumulation of amyloid-beta, tau, and reactive oxygen species may accelerate neurovascular unit senescence, suggesting a vicious cycle.
The cGAS-STING pathway may play a critical role in maintaining senescence, inducing SASP, and downregulating blood-brain barrier junction proteins.

Simplified

Alzheimer's disease (AD) is a common age-related neurodegenerative disorder (NDD), with ageing as its primary risk factor. Cellular senescence, characterized by permanent cell-cycle arrest, apoptosis resistance and acquisition of the senescence-associated secretory phenotype (SASP), is the cellular hallmark of ageing. Recent evidence indicates that blood-brain barrier (BBB) dysfunction precedes cognitive decline and pathological protein deposition, representing an early event in AD, with the neurovascular unit (NVU) providing the structural and functional basis of the BBB. Mounting evidence shows that the core NVU cells-brain microvascular endothelial cells (BMECs), pericytes and astrocytes-enter senescence under AD-related conditions. SASP factors released by these cells disrupt BBB junction proteins and trans-BBB transport systems, and propagate senescence within the NVU via paracrine signaling. Peripheral inflammatory mediators and immune cells then traverse the compromised BBB, aggravating AD pathology, while accumulating Aβ, tau and reactive oxygen species (ROS) reciprocally accelerate NVU senescence, constituting a proposed vicious cycle. At the molecular level, the cGAS-STING pathway concurrently drives senescence maintenance, SASP induction and type I interferon (IFN-I)-mediated downregulation of BBB junction proteins, serving as a key convergence point linking NVU senescence to BBB injury. From the NVU perspective, this review systematically examines how cellular senescence drives BBB dysfunction and AD progression, clarifies the role of cGAS-STING as a molecular node, and discusses therapeutic strategies targeting NVU senescence to preserve BBB integrity, aiming to offer new insights into AD mechanisms and treatment.

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Funding

Competing interests

No financial or personal ties reported.

PubMed

Aging of brain blood vessel support cells linked to blood-brain barrier problems in Alzheimer's disease: causes, effects, and treatment possibilities

Abstract

Full Text

Funding

Competing interests

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