Disruption of the Brain-Spleen Axis Impairs Monocyte-Microglia Communication and Accelerates Disease Progression in a Mouse Model of Amyloidosis
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ABSTRACT: Alzheimer’s disease (AD) is characterized by a prolonged asymptomatic phase before cognitive decline emerges, yet the mechanisms driving symptom onset remain unclear. Here, we hypothesized that the transition from asymptomatic to symptomatic disease is linked to dysfunction of brain–immune communication. Retrograde neuronal tracing in the 5xFAD mouse model of amyloidosis reveals reduced brain–spleen connectivity at advanced disease stages. To probe the functional role of the brain–spleen axis in coping with disease, we denervated the splenic nerve at an early presymptomatic stage. This intervention accelerates cognitive decline, impairs splenic hematopoiesis, diminishes monocyte recruitment to the brain, disrupts monocyte–microglia signaling networks, and reduces the transition of microglia from a homeostatic to a disease-associated (DAM) state. Conversely, enhancing splenic noradrenergic input increases hematopoiesis, restores monocyte homing to the brain, and delays cognitive impairment. The protective role of splenic monocytes was independently validated in a retinal cytotoxic injury model, in which splenic denervation impairs post-insult survival of retinal ganglion cells. Together, these findings identify an active brain–spleen circuit in regulating monocyte recruitment and establish peripheral monocytes as important drivers of microglial state transitions and disease progression.
INSTRUMENT(S): Liquid Chromatography MS - positive - reverse-phase
PROVIDER: MTBLS14615 | MetaboLights | 2026-06-01
REPOSITORIES: MetaboLights
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