N-Acetyldopamine derivatives from Periostracum Cicadae and their regulatory activities on Th1 and Th17 cell differentiation.

Published on Sep 1, 2020in Bioorganic Chemistry5.275
· DOI :10.1016/J.BIOORG.2020.104095
Punam Thapa2
Estimated H-index: 2
(Yeungnam University),
Ye Gu1
Estimated H-index: 1
(Yeungnam University)
+ 7 AuthorsJoo-Won Nam21
Estimated H-index: 21
(UIC: University of Illinois at Chicago)
Abstract Bioassay-guided fractionation of a 90% ethanol extract of Periostracum Cicadae led to the isolation of two new N-acetyldopamine dimers (1a/1b) along with six known dimers (2a/2b, 3a/3b, and 4a/4b) and two monomers (5a/5b); compounds 2a/2b, 4a/4b and 5a/5b were newly isolated from this material. All compounds were isolated as enantiomeric mixtures and each enantiomer was successfully separated by chiral-phase HPLC. The structures including absolute configurations were confirmed by high-resolution electrospray ionization mass spectrometry (HR-ESIMS), 1D/2D nuclear magnetic resonance (NMR) spectroscopy, 1H iterative Full Spin Analysis (HiFSA), and electronic circular dichroism (ECD) spectroscopy. Subsequently, the bioactivities of these isolates were evaluated via CD4+ T cell differentiations, which are critical for immune responses and inflammation. The results revealed that compound 5b was observed to enhance the IFN-γ+ Th1 differentiation, which may have a potential for cancer immunotherapy.
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