Bee venom ameliorates lipopolysaccharide-induced memory loss by preventing NF-kappaB pathway.

ABSTRACT: Accumulation of beta-amyloid and neuroinflammation trigger Alzheimer's disease. We previously found that lipopolysaccharide (LPS) caused neuroinflammation with concomitant accumulation of beta-amyloid peptides leading to memory loss. A variety of anti-inflammatory compounds inhibiting nuclear factor kappaB (NF-?B) activation have showed efficacy to hinder neuroinflammation and amyloidogenesis. We also found that bee venom (BV) inhibits NF-?B.A mouse model of LPS-induced memory loss used administration of BV (0.8 and 1.6 ?g/kg/day, i.p.) to ICR mice for 7 days before injection of LPS (2.5 mg/kg/day, i.p.). Memory loss was assessed using a Morris water maze test and passive avoidance test. For in vitro study, we treated BV (0.5, 1, and 2 ?g/mL) to astrocytes and microglial BV-2 cells with LPS (1 ?g/mL).We found that BV inhibited LPS-induced memory loss determined by behavioral tests as well as cell death. BV also inhibited LPS-induced increases in the level of beta-amyloid (A?), ?-and ?-secretases activities, NF-?B and its DNA-binding activity and expression of APP, and BACE1 and neuroinflammation proteins (COX-2, iNOS, GFAP and IBA-1) in the brain and cultured cells. In addition, pull-down assay and molecular modeling showed that BV binds to NF-?B.BV attenuates LPS-induced amyloidogenesis, neuroinflammation, and therefore memory loss via inhibiting NF-?B signaling pathway. Thus, BV could be useful for treatment of Alzheimer's disease.

SUBMITTER: Gu SM 

PROVIDER: S-EPMC4501073 | biostudies-literature | 2015 Jun

REPOSITORIES: biostudies-literature