Anti-inflammatory effects of concentrated ethanol extracts of edelweiss (Leontopodium alpinum Cass.) callus cultures towards human keratinocytes and endothelial cells

Lulli Daniela, Potapovich Alla, Riccardo Maurelli, Dellambra Elena, Pressi Giovanna, Kostyuk Vladimir, Dal Toso Roberto, De Luca Chiara, Pastore Saveria, Korkina Liudmila

Research output: Contribution to journalArticle

Abstract

Edelweiss (Leontopodium alpinum Cass.) is traditionally employed in folk medicine as an anti-inflammatory remedy. In nature, the plant is sparsely available and protected; therefore production of callus cultures was established. A concentrated ethanolic extract of culture homogenate, with leontopodic acid representing 55 ± 2 of the total phenolic fraction (ECC55), was characterized for anti-inflammatory properties in primary human keratinocytes (PHKs) and endotheliocytes (HUVECs). Inflammatory responses were induced by UVA+UVB, lipopolysaccharide (LPS), oxidized low-density lipoprotein (oxLDL), and a mixture of proinflammatory cytokines. Trichostatin A, a sirtuin inhibitor, was used to induce keratinocyte inflammatory senescence. ECC55 (1050 μg/mL) protected PHK from solar UV-driven damage, by enhancing early intracellular levels of nitric oxide, although not affecting UV-induced expression of inflammatory genes. Comparison of the dose-dependent inhibition of chemokine (IL-8, IP-10, MCP-1) and growth factor (GM-CSF) release from PHK activated by TNFα + IFNγ showed that leontopodic acid was mainly responsible for the inhibitory effects of ECC55. Sirtuin-inhibited cell cycle, proliferation, and apoptosis markers were restored by ECC55. The extract inhibited LPS-induced IL-6 and VCAM1 genes in HUVEC, as well as oxLDL-induced selective VCAM1 overexpression. Conclusion. Edelweiss cell cultures could be a valuable source of anti-inflammatory substances potentially applicable for chronic inflammatory skin diseases and bacterial and atherogenic inflammation.

Original languageEnglish
Article number498373
JournalMediators of Inflammation
Volume2012
DOIs
Publication statusPublished - 2012

ASJC Scopus subject areas

  • Immunology
  • Cell Biology

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