Đăng nhập
Tìm kiếm nâng cao
Tên bài báo
Tác giả
Năm xuất bản
Tóm tắt
Lĩnh vực
Phân loại
Số tạp chí

Bản tin định kỳ
Báo cáo thường niên
Tạp chí khoa học ĐHCT
Tạp chí tiếng anh ĐHCT
Tạp chí trong nước
Tạp chí quốc tế
Kỷ yếu HN trong nước
Kỷ yếu HN quốc tế
Book chapter
Bài báo - Tạp chí
72 (2016) Trang: 3240-3249
Tạp chí: Tetrahedron

A natural material extract library (Korea Bioactive Natural Material Bank) was screened with respect to their protective effects on neuronal cells, and a 70% ethanol extract from the flowers of Camellia japonica turned out to be a potential hit. Bioassay-guided fractionation of this active extract led to the isolation of six new 3,4-seco-28-nor-oleanane triterpenoids (1e6). The molecular structures of these new triterpenoids were elucidated through extensive spectroscopic analyses, including high-resolution MS and 1Dand 2D-NMR data. In a rotenone model of Parkinson’s disease (PD), compounds 3e6 effectively protected against neurotoxicity in the human dopaminergic SH-SY5Y cell line. Among these 3,4-seco-28-nor-oleanane triterpenoids, 4,17b,29-trihydroxy-16-oxo-3,4-seco-28-norolean-12-en-3-oic acid n-butyl ester (5) exerted the strongest neuroprotective effect by suppressing the expression of a-synuclein and the intracellular production of reactive oxygen species (ROS) induced by rotenone treatment. In addition, compound 5 induced microtubule-associated protein 1A/1B-light chain 3 (LC3), which is known as an autophagy biomarker. These results suggest a new class of chemical entities for developing bioactive compounds for PD therapy.


Vietnamese | English

Vui lòng chờ...