Phytochemical Investigation and Anti-Inflammatory Activity of the Leaves of Machilus japonica var. kusanoi

• Published in: Molecules (Basel, Switzerland) Switzerland), 2020-09, Vol.25 (18), p.4149
• Main Authors: Li, Shiou-Ling, Wu, Ho-Cheng, Hwang, Tsong-Long, Lin, Chu-Hung, Yang, Shuen-Shin, Chang, Hsun-Shuo
• Format: Article
• Language: English
• Subjects: Absolute configuration; Anions; anti-inflammatory activity; Anti-inflammatory agents; Anti-Inflammatory Agents - chemistry; Anti-Inflammatory Agents - pharmacology; Anti-Inflammatory Agents - therapeutic use; butanolide; Cytochalasin B; Elastase; Formyl peptides; Fractionation; Humans; Inflammation; lauraceae; Laurales - chemistry; Leaves; Leukocytes (neutrophilic); lignan; Lignans; Machilus japonica var. kusanoi; Molecular Structure; Neutrophils; Phenylalanine; Phytochemicals; Phytochemicals - chemistry; Phytochemicals - pharmacology; Phytochemicals - therapeutic use; Plant extracts; Plant Extracts - chemistry; Plant Extracts - pharmacology; Plant Leaves - chemistry; Single crystals; Spectrum analysis; Superoxide anions; X-ray diffraction
• ISSN: 1420-3049; 1420-3049
• DOI: 10.3390/molecules25184149

In a series of anti-inflammatory screenings of lauraceous plants, the methanolic extract of the leaves of var. (Hayata) J.C. Liao showed potent inhibition on both superoxide anion generation and elastase release in human neutrophils. Bioassay-guided fractionation of the leaves of var. led to the isolation of twenty compounds, including six new butanolides, machinolides A-F ( - ), and fourteen known compounds ( - ). Their structures were characterized by 1D and 2D NMR, UV, IR, CD, and MS data. The absolute configuration of the new compounds were unambiguously confirmed by single-crystal X-ray diffraction analyses ( , , and ) and Mosher's method ( , , and ). In addition, lignans, (+)-eudesmin ( ), (+)-methylpiperitol ( ), (+)-pinoresinol ( ), and (+)-galbelgin ( ) exhibited inhibitory effects on -formyl-methionyl-leucyl-phenylalanine/cytochalasin B (fMLP/CB)-induced superoxide anion generation in human neutrophils with IC values of 8.71 ± 0.74 μM, 2.23 ± 0.92 μM, 6.81 ± 1.07 μM, and 7.15 ± 2.26 μM, respectively. The results revealed the anti-inflammatory potentials of Formosan var.