Neuroprotective effects of the new diterpene, CBNU06 against beta-amyloid-induced toxicity through the inhibition of NF-kappaB signaling pathway in PC12 cells

Hyo Shin Kim, Ji Youn Lim, Dong Geun Sul, Bang Yeon Hwang, Tae J. Won, Kwang Woo Hwang, So Young Park

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25 Citations (Scopus)


Alzheimer's disease is the most common form of dementia, causing progressive cognitive dysfunction, particularly memory loss. Recently, modulation of beta-amyloid (Aβ) toxicity, one of the major potential causes of Alzheimer's disease, has emerged as a possible therapeutic approach to control the onset of Alzheimer's disease. In this study, we investigated the neuroprotective effects and possible mechanisms by which 19-hydroxy-1α,6-diacetoxy-6,7-seco-ent-kaur-16-en-15-one-7,20-olide (named as CBNU06), a new diterpene isolated from Isodon japonicus, acts against Aβ-induced toxicity in PC12 cells. Pretreatment with CBNU06 (20 μg/ml) prior to Aβ25-35 (25 μM) significantly increased the viability of PC12 cells in a dose-dependent manner when examined by Hoechst staining, MTT assay and Trypan blue exclusion assay. This protective effect was accompanied by the decrease in translocation of NF-κB p50 and p65 from the cytoplasm to the nucleus, and followed by the decrease in cyclooxygenase-2 (COX-2) levels. In addition, pretreatment with CBNU06 significantly reversed the effect of Aβ on Bax and Bcl-2. Taken together, these results suggest that CBNU06 protected PC12 cells against Aβ-induced neurotoxicity through the inhibition of the NF-κB signaling pathways. Therefore, CBNU06 has the possible beneficial effects in Alzheimer's disease by attenuating Aβ-induced toxicity.

Original languageEnglish
Pages (from-to)25-31
Number of pages7
JournalEuropean Journal of Pharmacology
Issue number1-3
Publication statusPublished - 2009 Nov 10



  • Alzheimer's disease
  • Beta-amyloid
  • CBNU06 (19-hydroxy-1α,6-diacetoxy-6,7-seco-ent-kaur-16-en-15-one-7,20-olide)
  • NF-kappaB
  • PC12 cells

ASJC Scopus subject areas

  • Pharmacology

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