Journal of cerebral blood flow and metabolism : official journal of the International Society of Cerebral Blood Flow and MetabolismMay 5, 2026

Reducing cell aging helps improve brain blood flow and barrier damage caused by midlife obesity

Longevity & Aging Weekly Brief ↗PubMed ↗DOI ↗

Updated Jun 27, 2026

Abstract

Essence

Clearing p16 senescent cells partially reversed obesity-linked neurovascular dysfunction in a high-fat-diet model.

Evidence

This preclinical study combined longitudinal in vivo imaging, single-cell RNA sequencing, and behavioral assays in high-fat-diet-induced obesity to link senescence signatures with reduced microvascular density, impaired neurovascular coupling, blood-brain barrier disruption, neuroinflammation, and cognitive decline.

Caveat

The intervention produced partial restoration in a model system, so it does not establish human clinical benefit for midlife obesity or dementia risk.

Simplified

Midlife obesity is a major risk factor for vascular cognitive impairment (VCI) and dementia, but the cellular mechanisms linking obesity to brain microvascular dysfunction remain unclear. Here, we show that high-fat diet (HFD)-induced obesity accelerates cellular senescence within the neurovascular unit (NVU), resulting in structural and functional microcirculatory deficits. Combining multimodal in vivo longitudinal imaging with single-cell RNA sequencing, we identify a senescence-associated transcriptional program in endothelial cells and neurons, coinciding with reduced brain microvascular density, impaired neurovascular coupling (NVC), and disruption of blood-brain barrier (BBB) integrity. These vascular abnormalities associate with cognitive decline in behavioral assays. Transcriptomic profiling further revealed cell-type-specific senescence signatures, including dysregulation of angiogenic, mitochondrial, and inflammatory pathways, which were alleviated by senescent-cell clearance. Notably, clearing p16senescent cells partially restored BBB integrity, improved NVC responses, and reduced neuroinflammation. Together, these findings identify cellular senescence as a mechanistic driver of midlife obesity-induced cerebrovascular and cognitive dysfunction and provide proof-of-concept that senescence-targeted therapies may preserve brain health in individuals with midlife obesity who are at risk for dementia. +