Targeting TLR4/NF-κB/NLRP3 signaling with 6-hydroxyflavanone mitigates amyloid-β-induced Alzheimer's disease in mice.

Abstract

Alzheimer's disease (AD) is the most common neurodegenerative disorder and is characterized by progressive cognitive decline, cholinergic dysfunction, oxidative stress, and neuroinflammation. Despite extensive research, effective disease-modifying therapies remain unavailable. 6-Hydroxyflavanone (6-OH-F), a naturally occurring flavonoid with antioxidant and anti-inflammatory properties, has not been investigated in AD. This study evaluated the neuroprotective potential of 6-OH-F against amyloid-β (Aβ)-induced AD pathology. Network pharmacology was employed to identify potential targets and pathways associated with 6-OH-F in AD. Neuro-2a cells were pretreated with 6-OH-F (12.5-50 μM) before Aβ exposure, followed by assessment of cell viability, reactive oxygen species (ROS), acetylcholinesterase (AChE), NLRP3, TNF-α, and IL-1β levels. AD was induced in mice by intracerebroventricular administration of pre-aggregated Aβ. Animals received 6-OH-F (15, 30, or 60 mg/kg, p.o.) for four weeks. Behavioral, biochemical, molecular, imaging, and histopathological analyses were subsequently performed. Network pharmacology revealed significant overlap between 6-OH-F targets and AD-associated genes, with enrichment of pathways related to neuronal function and inflammation. In vitro, 6-OH-F attenuated Aβ-induced cytotoxicity and reduced ROS, AChE, NLRP3, TNF-α, and IL-1β levels. In vivo, 6-OH-F improved cognitive performance, alleviated oxidative stress and cholinergic dysfunction, and suppressed the expression of TLR4, pNF-κB, NLRP3, ASC, caspase-1, GSDMD, pro-inflammatory cytokines, IBA1, and GFAP. Furthermore, it reduced neuronal degeneration, blood-brain barrier disruption, and cerebral hemodynamic abnormalities. 6-OH-F ameliorates Aβ-induced cognitive impairment by attenuating oxidative stress, neuroinflammation, and pyroptotic signaling, potentially through modulation of the TLR4/NF-κB/NLRP3 pathway, highlighting its therapeutic potential in Alzheimer's disease.