Journal
BIOORGANIC & MEDICINAL CHEMISTRY
Volume 23, Issue 13, Pages 3730-3737Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.bmc.2015.04.007
Keywords
Selaginella tamariscina; Biflavonoids; PTP1B inhibitors; 2-NBDG
Funding
- National Research Foundation of Korea (NRF) - Ministry of Education, Science and Technology [KRF-2012R1A2A2A06046921]
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As part of an ongoing search for new antidiabetic agents from medicinal plants, the methanol extract of the aerial parts of Selaginella tamariscina was found to possess stimulatory effect on glucose uptake in 3T3-L1 adipocyte cells. Thus, bioassay-guided isolation of this active extract yielded two new compounds (1 and 2) along with five known biflavonoids (3-7). Their structures were elucidated by extensive analysis of spectroscopic and physicochemical data. The absolute configuration of compound 2 was determined by specific rotation and CD data analysis. All isolates exhibited potent inhibitory effects on PTP1B enzyme with IC50 values ranging from 4.5 +/- 0.1 to 13.2 +/- 0.8 mu M. Furthermore, the isolates (1-7) showed significant stimulatory effects on 2-NBDG uptake in 3T3-L1 adipocyte cells. Of these, compounds (1, 6, and 7) which exhibited mixed-competitive inhibition modes against PTP1B, showed potent stimulatory effects on 2-NBDG uptake. This result indicated the potential of these biflavonoids as lead molecules for development of antidiabetic agents and the beneficial use of S. tamariscina against hyperglycemia. (C) 2015 Elsevier Ltd. All rights reserved.
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