Camptothecin and its analogs reduce amyloid-β production and amyloid-β42-induced IL-1β production.

Compounds derived from natural products are becoming promising alternative drugs/tools in Alzheimer's disease (AD) therapeutics. From an in-house natural products library, seventeen hits were selected for their inhibitory effect on the production of amyloid-beta (A beta) with IC50 lower than 10 mu M without causing obvious toxicity. Among these compounds, camptothecin (CPT) and its analogs showed inhibitory effects on amyloid-beta 1-42 (A beta(42)) with the IC50 value in the nanomolar range in HEKsw cells and SHSY5Ysw cells. Further studies showed that CPT and its analogs inhibited A beta(42) via a p(53) dependent pathway. Meanwhile, CPT and its analogs could also inhibit A beta(42) induced IL-1 beta production in the THP-1 cells. Taken together, our results indicate that CPT and its analogs would be a promising therapeutic candidates for AD.