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Zenichi Yoshida (1925-2023)
Zenichi Yoshida (1925-2023)
Professor. Zenichi Yoshida,
a member of the Honorary Advisors of HETEROCYCLES (1975-1998),
has passed away on May 4, 2023 at the age of 97.
I deeply express my regret over his death.
Kunio Ogasawara
Editor
May 11, 2023
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Short Paper | Regular issue | Vol 96, No. 5, 2018, pp.921-930
Published online, 20th April, 2018
Published online, 20th April, 2018
DOI: 10.3987/COM-18-13891
■ Two New Steroidal Alkaloids from the Bulbs of Fritillaria thunbergii
Won Se Suh, Seung Young Lee, Jong Eel Park, Dong Hyun Kim, Sun Yeou Kim, and Kang Ro Lee*
*Natural Products Laboratory, School of Pharmacy, Sungkyunkwan University, 2066 Seobu-Ro, Jangan-ku, Suwon, Gyeonggi-do, Korea
Abstract
In the quest for biologically active compounds from natural medicinal sources in Korea, the bulbs of Fritillaria thunbergii were investigated. Phytochemical analysis of the MeOH extracts resulted in the isolation and identification of ten steroidal alkaloids (1–10) including two new compounds, named frithunbol A and B (1 and 2). The structures of these new compounds were elucidated based on 1D, 2D NMR analyses and HR-FAB-MS. All the isolated compounds (1–10) were evaluated for their effects on nitric oxide (NO) production in lipopolysaccharide (LPS)-activated BV-2 cells and the neuroprotective effect was determined via induction of nerve growth factor (NGF) in C6 glioma cells. Compounds 2, 3, and 10 significantly inhibited NO levels with IC50 values of 16.35 μM, 11.45 μM and 18.02 μM, respectively. Also, compound 9 was a potent stimulant of NGF release, and enhanced the levels of NGF by 134.81 ± 3.66%.
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