Natural Small-Molecule Bergapten Ameliorates Amyloid-β Pathology and Neuroinflammation in Alzheimer's Disease

The pathogenesis of Alzheimer's disease (AD) is complex, and effective treatments remain elusive. Growing evidence suggests that dietary factors may play a significant role in preventing or alleviating AD. Bergapten (BG), a natural compound with anti-inflammatory properties, has been studied; however, its specific role in neuroinflammation and AD pathogenesis remains unclear.

Through public databases and bioinformatics tools, the possible molecular mechanisms of BG's effects on AD were analyzed. Six-month-old 5×FAD mice underwent intragastric administration of BG for 30 consecutive days. Learning and memory abilities were assessed using the novel object recognition (NOR) test and the Morris water maze (MWM) test. Immunofluorescence staining, Western blot and q-PCR was conducted to assess the underlying mechanisms. In vitro experiments used Aβ-stimulated BV2 microglial cells for BG intervention.

Bioinformatics analysis revealed the MAPK signaling pathway as the top-ranked pathway. Molecular docking studies further demonstrated strong binding interactions between BG and key proteins within the MAPK pathway. In behavioral studies, NOR test and MWM test demonstrated that BG treatment improved learning and memory abilities in 5×FAD mice. Additionally, BG treatment significantly reduced Aβ deposition, pro-inflammatory cytokine levels, and inhibited excessive microglial activation in these mice. Consistent with in vivo findings, BG effectively decreased pro-inflammatory cytokines in Aβ-stimulated BV2 microglial cells. Mechanistic studies revealed that BG attenuates neuroinflammatory responses by inhibiting the MAPK signaling pathway both in vivo and in vitro.

Our findings suggest that BG mitigates AD pathological features by suppressing MAPK-mediated neuroinflammation and represents a promising natural small molecule for the prevention and treatment of AD.