title: Rat lens aldose reductase inhibitory activities of Coptis japonica root-derived isoquinoline alkaloids.
abstract: The inhibitory activity of Coptis japonica root-derived materials was evaluated against lens aldose reductase isolated from male Sprague-Dawley rats and compared to that of three commercially available isoquinoline alkaloids (berberine sulfate, berberine iodide, and palmatine chloride), as well as quercitrin as aldose reductase inhibitor. The biologically active constituents of C. japonica extract were characterized as the isoquinoline alkaloids, berberine chloride and palmatine iodide, by spectral analysis. The inhibitory effects varied with both chemical and concentration used. The IC(50) values of berberine chloride and palmatine iodide are 13.98 and 13.45 nM, respectively. Among three berberines and two palmatines, the inhibitory activity was much greater for the choridated and sulfated analogues than for those with iodide. Quercitrin was a much more potent inhibitor than berberines and palmatines. Nonetheless, berberines and palmatines may be useful as lead compounds and new agents for aldose reductase inhibition.
authors.affiliation: Research Center for Industrial Development of Biofood Materials and Institute of Agricultural Science & Technology, College of Agriculture, Chonbuk National University, Chonju 561-756, Korea. hoiseon@ moak.chonbuk.ac.kr
authors.forename: Hoi-Seon
authors.initials: HS
authors.lastname: Lee
mesh_terms: D000449:Aldehyde Reductase / Q000037:antagonists & inhibitors*; D000818:Animals; D001600:Berberine Alkaloids / Q000302:isolation & purification / Q000494:pharmacology*; D039323:Coptis / Q000737:chemistry*; D004791:Enzyme Inhibitors / Q000302:isolation & purification / Q000494:pharmacology*; D009682:Magnetic Resonance Spectroscopy; D008297:Male; D013058:Mass Spectrometry; D000432:Methanol; D010936:Plant Extracts / Q000737:chemistry; D018517:Plant Roots / Q000737:chemistry*; D051381:Rats; D017207:Rats, Sprague-Dawley
chemical_list: D001600:Berberine Alkaloids; D004791:Enzyme Inhibitors; D010936:Plant Extracts; D000449:Aldehyde Reductase; C005413:palmatine; D000432:Methanol