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Anti-inflammatory dihydroxanthones from a Diaporthe species.

Abstract

In a search for anti-inflammatory compounds from fungi inhibiting the promoter activity of the small chemokine CXCL10 (Interferon-inducible protein 10, IP-10) as a pro-inflammatory marker gene, the new dihydroxanthone methyl (1R, 2R)-1,2,8-trihydroxy-6-(hydroxymethyl)-9-oxo-2,9-dihydro-1H-xanthene-1-carboxylate (2) and the previously described dihydroxanthone AGI-B4 (1) were isolated from fermentations of a Diaporthe species. The structures of the compounds were elucidated by a combination of one- and two-dimensional NMR spectroscopy, mass spectrometry, and calculations using density functional theory (DFT). Compounds 1 and 2 inhibited the LPS/IFNgamma induced CXCL10 promoter activity in transiently transfected human MonoMac6 cells in a dose-dependent manner with IC50 values of 4.1 microM (+-0.2 microM) and 1.0 microM (+-0.06 microM) respectively. Moreover, compounds 1 and 2 reduced mRNA levels and synthesis of pro-inflammatory mediators such as cytokines and chemokines in LPS/IFNgamma stimulated MonoMac6 cells by interfering with the Stat1 and NFkappaB pathway.

Authors: Rohr M, Kiefer AM, Kauhl U, GroƟ J, Opatz T, Erkel G,
Journal: Biol Chem;2021Aug02. 403(1):89-101 doi:10.1515/hsz-2021-0192
Year: 2021
PubMed: PMID: 34333887 (Go to PubMed)