کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1374418 981918 2006 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Inhibition of protein tyrosine phosphatase 1B by diterpenoids isolated from Acanthopanax koreanum
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آلی
پیش نمایش صفحه اول مقاله
Inhibition of protein tyrosine phosphatase 1B by diterpenoids isolated from Acanthopanax koreanum
چکیده انگلیسی

Inhibition of protein tyrosine phosphatase 1B (PTP1B) has been proposed as a therapy to treat type 2 diabetes and obesity. In our preliminary screening study on the PTP1B inhibitory activity, a CH2Cl2-soluble extract of the roots of Acanthopanax koreanum (Araliaceae) was found to inhibit PTP1B activity at 30 μg/ml. Eight diterpenoids were isolated from the active fraction and were evaluated for their inhibitory effect on PTP1B. A kaurane-type diterpene, 16αH,17-isovaleryloxy-ent-kauran-19-oic acid (7), inhibited PTP1B with an IC50 value of 7.1 ± 0.9 μM in a non-competitive manner. Acanthoic acid (2) and ent-kaur-16-en-19-oic acid (5) also inhibited PTP1B in dose-dependent manners. Either introduction of a hydroxyl group or reduction of a carboxyl group at C-19 in pimarane-type to alcohol abolished the inhibitory effects toward PTP1B.

Bioassay-guided fractionation of the CH2Cl2-soluble fraction led to the isolation of three PTP1B inhibitory diterpenoids, acanthoic acid (2), ent-kaur-16-en-19-oic acid (5), and 16αH,17-isovaleryloxy-ent-kauran-19-oic acid (7), along with their five derivatives.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Bioorganic & Medicinal Chemistry Letters - Volume 16, Issue 11, 1 June 2006, Pages 3061–3064
نویسندگان
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