title: Characterization of prolidase activity using capillary electrophoresis with tris(2,2'-bipyridyl)ruthenium(II) electrochemiluminescence detection and application to evaluate collagen degradation in diabetes mellitus.
abstract: A new method for prolidase (PLD, EC 3.4.13.9) activity assay was developed based on the determination of proline produced from enzymatic reaction through capillary electrophoresis (CE) with tris(2,2'-bipyridyl)ruthenium(II) [Ru(bpy)3(2+)] electrochemiluminescence detection (ECL). A detection limit of 12.2 fmol (S/N = 3) for proline, corresponding to 1.22 x 10(-8) units of prolidase catalyzing for 1 min was achieved. PLD activity determined by CE-ECL method was in agreement with that obtained from the classical Chinard's one. CE-ECL showed its powerful resolving ability and selectivity as no sample pretreatment was needed and no interference existed. The clinical utility of this method was successfully demonstrated by its application to assay PLD activity in the serum of diabetic patients in order to evaluate collagen degradation in diabetes mellitus (DM). The results indicated that enhanced collagen degradation occurred in DM.
authors.affiliation: State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin 130022, China.
authors.forename: Jipei
authors.initials: J
authors.lastname: Yuan
authors.forename: Tao
authors.initials: T
authors.lastname: Li
authors.forename: Xue-Bo
authors.initials: XB
authors.lastname: Yin
authors.forename: Li
authors.initials: L
authors.lastname: Guo
authors.forename: Xiuzhen
authors.initials: X
authors.lastname: Jiang
authors.forename: Wenrui
authors.initials: W
authors.lastname: Jin
authors.forename: Xiurong
authors.initials: X
authors.lastname: Yang
authors.forename: Erkang
authors.initials: E
authors.lastname: Wang
mesh_terms: D015082:2,2'-Dipyridyl / Q000031:analogs & derivatives* / Q000737:chemistry; D003094:Collagen / Q000032:analysis* / Q000378:metabolism; D056831:Coordination Complexes; D003920:Diabetes Mellitus / Q000097:blood* / Q000201:enzymology / Q000378:metabolism; D004150:Dipeptidases / Q000032:analysis*; D004563:Electrochemistry; D019075:Electrophoresis, Capillary / Q000379:methods; D004789:Enzyme Activation; D006801:Humans; D006863:Hydrogen-Ion Concentration; D008163:Luminescent Measurements / Q000379:methods*; D011392:Proline / Q000032:analysis; D012680:Sensitivity and Specificity; D013997:Time Factors; D017975:Ruthenium Compounds
chemical_list: D015082:2,2'-Dipyridyl; D003094:Collagen; D056831:Coordination Complexes; D004150:Dipeptidases; D011392:Proline; C547232:tris(2,2-bipyridine)-ruthenium(II); D017975:Ruthenium Compounds; C022449:proline dipeptidase