Systemic neuroinflammatory and neurovascular microenvironment (NVU)

The systemic neuroinflammatory and neurovascular microenvironment is a complex, multi-component system that integrates the central nervous system (CNS) with systemic immune and vascular signals. It primarily centers on the neurovascular unit (NVU), which consists of endothelial cells, pericytes, astrocytes, microglia, and neurons working in concert to maintain the blood-brain barrier (BBB) and regulate cerebral blood flow [1, 2]. This microenvironment is highly sensitive to systemic inflammation; peripheral cytokines and activated immune cells can communicate across the BBB, leading to microglial activation and neuroinflammatory cascades [3]. In diseases such as Alzheimer's, Multiple Sclerosis, and stroke, the breakdown of this microenvironment—characterized by BBB leakage and chronic inflammation—is a primary driver of neuronal loss and cognitive decline [4]. Therapeutic interventions targeting this system do not focus on a single molecule but rather aim to stabilize the BBB, inhibit leukocyte infiltration, or modulate glial activity to restore CNS homeostasis [2, 4]. Drugs like Natalizumab and Fingolimod interact with this environment by preventing the entry of systemic immune cells into the brain parenchyma [4]. Monitoring this microenvironment often involves measuring biomarkers of glial activation and axonal damage, such as GFAP and NfL [4]. Overall, this system represents a critical interface for understanding how systemic health influences brain function and disease progression.

Other names

Neurovascular unit (NVU)Brain microenvironmentNeuroinflammatory nicheSystemic-brain axisNeurovascular-immune interface

Modulation of neurovascular unit integrity, inhibition of peripheral immune cell trafficking across the blood-brain barrier, and suppression of glial-mediated inflammatory signaling pathways [2, 4].