Why Are Perivascular Spaces Important?

Area of Science:

• Neuroimaging
• Cerebrovascular Health
• Neurodegenerative Diseases

Background:

• Perivascular spaces (PVS) and their enlarged form (EPVS) are increasingly recognized in neuroimaging.
• EPVS are associated with aging, hypertension, and cerebral small vessel disease (SVD).
• These spaces are vital for the glymphatic pathway, responsible for clearing metabolic waste from the brain.

Purpose of the Study:

• To highlight the growing interest in EPVS as a biomarker.
• To discuss the role of EPVS in the glymphatic system's waste clearance function.
• To explore the association of EPVS with neurodegenerative conditions and aging.

Main Methods:

• Non-invasive visualization of EPVS using T2-weighted magnetic resonance imaging (MRI).
• Observation of EPVS distribution in common brain regions (basal ganglia, centrum semiovale, frontal cortex, hippocampus).

Main Results:

• EPVS are frequently observed in aging and hypertensive individuals, serving as a biomarker for SVD.
• EPVS are implicated in the clearance of neurotoxic proteins like amyloid beta and tau, relevant to late-onset Alzheimer's disease (LOAD).
• Increased EPVS are also linked to Parkinson's disease and multiple sclerosis (MS).

Conclusions:

• EPVS visualization via MRI offers a non-invasive method to assess brain health.
• Dysfunction in EPVS may contribute to the accumulation of toxic proteins, potentially driving neurodegeneration.
• EPVS serve as a critical indicator for various neurological disorders and aging processes.