Stimulation of non-amyloidogenic processing of amyloid-β protein precursor by cryptotanshinone involves activation and translocation of ADAM10 and PKC-α

S S Kumar DURAIRAJAN, Liangfeng LIU, Jia Hong Lu, Irene Koo, Kei Maruyama, Sookja K. Chung, Jian Dong Huang*, Min LI

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

23 Citations (Scopus)

Abstract

Cerebral deposition of amyloid-β peptide (Aβ) plaques is now considered the central feature of Alzheimer's disease. Recent studies suggest that cryptotanshinone (CTS) extracted from the root of Salvia miltiorrhiza Bunge could be used for the prevention and treatment of Alzheimer's disease. In this study, we investigated the role of CTS on non-amyloidogenic processing of amyloid-β protein precursor (AβPP) as well as its regulation by protein kinase C (PKC). Treatment with CTS dose-dependently and significantly reduced both intracellular and secreted levels of Aβ40 and Aβ42 in N2a mouse neuroblastoma cells stably expressing human SwedishAβPP (N2a-SwedAβPP). Using N2a-SwedAβPP and human neuroblastoma SHSY5Y cells, it was demonstrated that CTS significantly and dose-dependently increased the production of sAβPPα and C-terminal fragment-α (CTF-α) from AβPP. At the same time, CTS specifically increased the maturation of "a disintegrin and metalloproteinase-10" (ADAM10), an α-secretase candidate. The increase of sAβPPα secretion by CTS was blocked by the hydroxamate-based inhibitors GI254023X and GW280264X, and by the PKC-α inhibitor GÖ6976, suggesting involvement of the ADAM10 and PKC-α in CTS-induced α-secretase cleavage. In other experiments, CTS induced the phosphorylation of PKC-α indicating that PKC-α is involved in CTS-induced sAβPPα secretion. Furthermore, treatment of neuroblastoma cells with CTS induced the co-translocation of ADAM10 and PKC-α to the cell membrane, the site at which AβPP was cleaved, and this translocation was significantly reduced by GÖ6976. These results suggest that CTS-induced sAβPPα secretion is regulated by a PKC-α and ADAM10 cascade in neuroblastoma cells and may be involved in the lowering of Aβ production.

Original languageEnglish
Pages (from-to)245-262
Number of pages18
JournalJournal of Alzheimer's Disease
Volume25
Issue number2
DOIs
Publication statusPublished - 2011

Scopus Subject Areas

  • Neuroscience(all)
  • Clinical Psychology
  • Geriatrics and Gerontology
  • Psychiatry and Mental health

User-Defined Keywords

  • ADAM10
  • Alzheimer's disease
  • amyloid-β
  • Chinese medicine
  • cryptotanshinone
  • neuroblastoma
  • PKC

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