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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
A bromopyrrole-containing diterpene alkaloid from the Okinawan marine sponge Agelas nakamurai activates the insulin pathway in Huh-7 human hepatoma cells by inhibiting protein tyrosine phosphatase 1B.
Bioorganic & Medicinal Chemistry Letters 2017 May 16
Agelasine G (1), a known bromine-containing diterpene alkaloid, was isolated as a new type of protein tyrosine phosphatase (PTP) 1B inhibitor together with ageline B (2), an inactive debromo-derivative of 1, from the marine sponge Agelas nakamurai collected at Iriomote Island in Okinawa, Japan. Further biological evaluations revealed that compound 1 exhibited selective inhibitory activity against PTP1B over T-cell PTP and CD45 phosphatase. Compound 1 also enhanced the insulin-stimulated phosphorylation levels of Akt in Huh-7 cells more strongly than compound 2. The results obtained in this study suggest that compound 1 activates the insulin signaling pathway by inhibiting PTP1B activity.
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