| 초록 |
Alzheimer's disease (AD), one of the most common forms of dementia, is characterized pathologically by the presence of intracellular neurofibrillary tangles and deposition of ${ beta}$ -amyloid ( $A{ beta}$ ) peptides of 40-42 residues, which are generated by processing of amyloid precursor protein (APP). $A{ beta}$ has been believed to be neurotoxic and now is also considered to have a role on the mechanism of memory dysfunction. Here, we show that MeOH extract from stem bark of Platycarya strobilacea Sieb. et. Zucc. (PSM) affects on the processing of APP from the APPswe over-expressing Neuro2a cell line. We found that PSM may regulate the processing of APP and increase the sAPP ${ alpha}$ . PSM does not change the protein level of presenilin and nicastrin, however, it reduces the protein expression level of BACE1. In addition, PSM reduces the secretion level of $A{ beta}42$ and $A{ beta}40$ from the cell line without toxicity. We suggest that Platycarya strobilacea may be useful as a herbal medicine to treat Alzheimer's disease. |
