Isolation and characterization of neuroprotective lignans from salted Aconiti lateralis Radix Praeparata

Six lignans (1-6) were isolated from salted Aconiti lateralis Radix Praeparata for the first time. These isolates were elucidated as hedyotisol-A (1), (7″R,8″R)-8″-syringaresinol-4″-hydroxy-3″,5″-dimethoxyphenyl-7″,9″-propanediol (2), lariciresinol-4-O-β-d-glucopyranoside (3),(7S,8S)-4-hydroxy-3-methoxy-7,8-(2',1'-O-β-d-glucopyranosyl)phenyl-propanetriol (4), (+)-isolariciresinol (5), and (+)-lyoniresinol (6) by analyzing extensive and comprehensive spectral data and compared with the data described in the literature, respectively. Compounds (1-6) were evaluated for their neuroprotective activities against corticosterone-induced cell death in PC12 cells with desipramine as the positive control drug. Among them, compounds 1 and 2 showed moderate neuroprotective activities, which increased the survival rates of PC12 cells from 45.50 ± 2.23% to 65.98 ± 1.29%, 58.19 ± 2.94% at 10 µm, respectively.