Publication type: Article in scientific journal
Type of review: Peer review (publication)
Title: Symphytum officinale L. : liquid-liquid chromatography isolation of caffeic acid oligomers and evaluation of their influence on pro-inflammatory cytokine release in LPS-stimulated neutrophils
Authors: Trifan, Adriana
Skalicka-Woźniak, Krystyna
Granica, Sebastian
Czerwińska, Monika E.
Kruk, Aleksandra
Marcourt, Laurence
Wolfender, Jean-Luc
Wolfram, Evelyn
Esslinger, Nils
Grubelnik, Andreas
Luca, Simon Vlad
et. al: No
DOI: 10.1016/j.jep.2020.113169
Published in: Journal of Ethnopharmacology
Volume(Issue): 262
Issue: 113169
Issue Date: 31-Jul-2020
Publisher / Ed. Institution: Elsevier
ISSN: 0378-8741
Language: English
Subjects: Caffeic acid oligomer; Countercurrent chromatography; Cytokine release inhibitory activity; Globoidnan A (PubChem CID: 56841780); Globoidnan B (SpectraBase CID: 6x5Eig4VgdC); Interleukin 1β; Liquid-liquid chromatography; Rabdosiin (PubChem CID: 471121); Rosmarinic acid (PubChem CID: 5281792); Stimulated neutrophils; Symphytum officinale
Subject (DDC): 615: Pharmacology and therapeutics
Abstract: Ethnopharmacological relevance: Symphytum officinale L. (comfrey, Boraginaceae) has been traditionally used for millennia in joint distortions, myalgia, bone fractures and hematomas. However, key activity-determining constituents and molecular mechanisms underlying its use have not been completely elucidated. Aim of the study: The objective of this study was to isolate and identify the major compounds from a hydro-ethanolic root extract of S. officinale and evaluate their antioxidant potential, alongside their effect on the cytokine production of ex vivo stimulated neutrophils, thus providing scientific support for the traditional use of comfrey root. Material and methods: Four caffeic acid oligomers were isolated from comfrey roots by liquid-liquid chroma-tography, their structures being established by MS and NMR analyses. In vitro antioxidant evaluation was per-formed by DPPH and ABTS assays. The cytotoxicity of isolated compounds was established by flow cytometry. The effect on cytokine release, such as interleukin (IL)-1β, IL-8 and tumor necrosis factor alpha (TNF-α), in lipopolysaccharide (LPS)-stimulated neutrophils was determined by enzyme-linked immunosorbent assay (ELISA). Results: The main constituents found in comfrey root were represented by four caffeic acid oligomers, namely globoidnan B (1), rabdosiin (2), rosmarinic acid (3) and globoidnan A (4). Rabdosiin, globoidnans A and B were isolated for the first time from S. officinale. In the in vitro antioxidant tests, compound 2 was the most active, with EC50 values in DPPH and ABTS assays of 29.14 ±0.43 and 11.13 ±0.39, respectively. Neutrophils’ viability over the tested concentration domain of 12.5–50 μM was not altered. At 50 μM, all compounds significantly inhibited IL-1β release, with compound 3 (45.60% release vs. LPS stimulated neutrophils) being the most active, followed by compounds 1 (53.85%), 2 (69.89%) and 4 (60.68%). Conclusions: The four caffeic acid oligomers reported in S. officinale root may contribute to the overall anti- inflammatory activity for which comfrey preparations are used in traditional medicine.
Fulltext version: Published version
License (according to publishing contract): Licence according to publishing contract
Departement: Life Sciences and Facility Management
Organisational Unit: Institute of Chemistry and Biotechnology (ICBT)
Appears in collections:Publikationen Life Sciences und Facility Management

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