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Screening and isolation of a natural dopamine D1 receptor antagonist using cell-based assays

Paper ID Volume ID Publish Year Pages File Format Full-Text
24486 43518 2010 6 PDF Available
Title
Screening and isolation of a natural dopamine D1 receptor antagonist using cell-based assays
Abstract

To develop a cell-based assay to screen for human dopamine D1 receptor agonists or antagonists from medicinal plant extracts, a stable Chinese hamster ovary (CHO) cell line (CHO-D1R) expressing the human dopamine D1 receptor was established using an expression vector containing a scaffold attachment region (SAR) element. CHO-D1R cells showed specific binding to [3H]-SCH23390 with high affinity (Kd = 1.47 ± 0.17 nM) and dose-dependent responses for the dopamine-mediated stimulation of cAMP concentrations (EC50 = 20.6 ± 1.44 nM). The screening of medicinal plant extracts using cell-based cAMP assays revealed that an extract of Gleditsia sinensis Lam., which is known to be rich in saponin, had strong antagonist activity for the D1 receptor. From the activity-guided fractionation and chemical structural analysis of the G. sinensis extract, a compound called gleditsioside F was isolated and was identified to have antagonist activity for the D1 receptor. Gleditsioside F showed very effective D1 antagonist activity by inhibiting ligand binding to the D1 receptor as well as by inhibiting dopamine-mediated increases in cAMP concentration.

Keywords
Dopamine; D1 receptor; Cell-based assay; Gleditsia sinensis; Gleditsioside F
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Screening and isolation of a natural dopamine D1 receptor antagonist using cell-based assays
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Biotechnology - Volume 145, Issue 3, 1 February 2010, Pages 304–309
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us