The phytochemical study of the fruiting body methanol extract led to the isolation of six new triterpenoids (-) and one new naphthalenoid pulvinic acid derivative (), together with five known compounds, including norbadione A (). Their structure was established from 1D and 2D NMR spectroscopy and HRESIMS analyses. The absolute configuration of the triterpenoids was determined by circular dichroism. The two pulvinic acid derivatives and , showing the highest activity in modulating IL-6 secretion, were tested for their effect on COX-2, STAT3, and p-STAT3 proteins; both compounds were able to downregulate p-STAT3.
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http://dx.doi.org/10.1021/acs.jnatprod.3c01055 | DOI Listing |
Chem Biodivers
May 2024
CAS Key Laboratory for Plant Diversity and Biogeography of East Asia, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, 650201, Yunnan, China.
Lanmaoa asiatica G. Wu & Zhu L. Yang and L.
View Article and Find Full Text PDFJ Nat Prod
March 2024
Dipartimento di Farmacia, Università degli Studi di Salerno, 84084 Fisciano (SA), Italy.
J Nat Prod
March 2023
Chemistry, School of Molecular Sciences, University of Western Australia, Perth, WA 6009, Australia.
The lichen natural products pulvinamide, rhizocarpic acid, and epanorin have been synthesized and characterized spectroscopically and by X-ray crystallography. The syntheses, by ring-opening of pulvinic acid dilactone (PAD), may well be biomimetic, given the well-known occurrence of PAD in lichen. The enantiomers, -rhizocarpic acid and -epanorin, and corresponding carboxylic acids, norrhizocarpic acid and norepanorin, were similarly prepared.
View Article and Find Full Text PDFEnviron Microbiol
August 2021
Department of Pharmaceutical Microbiology at the Leibniz Institute for Natural Product Research and Infection Biology, Friedrich Schiller University, Beutenbergstrasse 11a, Jena, 07745, Germany.
Natural products play a vital role for intermicrobial interactions. In the basidiomycete arena an important representative is variegatic acid, a lactone natural product pigment whose ecological relevance stems from both inhibiting bacterial swarming and from indirect participation in breakdown of organic matter by brown-rotting fungi. Previous work showed that the presence of bacteria stimulates variegatic acid production.
View Article and Find Full Text PDFPlants (Basel)
January 2020
Univ Rennes, CNRS, ISCR (Institut des Sciences Chimiques de Rennes)-UMR 6226, F-35000 Rennes, France.
Lichens are slow-growing organisms supposed to synthetize specialized metabolites to protect themselves against diverse grazers. As predicted by the optimal defense theory (ODT), lichens are expected to invest specialized metabolites in higher levels in reproductive tissues compared to thallus. We investigated whether Laser Desorption Ionization coupled to Mass Spectrometry Imaging (LDI-MSI) could be a relevant tool for chemical ecology issues such as ODT.
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