title: Capillary electrophoresis immunoassay chemiluminescence detection of zeptomoles of bone morphogenic protein-2 in rat vascular smooth muscle cells.
abstract: A capillary electrophoresis immunoassay (CEIA) method based on enhanced chemiluminescence (CL) detection was developed and applied to arteriosclerosis pathology research in the medical field. The system of enzyme-horseradish peroxidase (HRP) catalyzing the luminol/H2O2/p-iodophenol reaction was adopted in this paper. HRP was detected with the detection limit (S/N = 3) of 4.4 pM (53 zmol), which represents one of the highest sensitivities of HRP reported yet. HRP was first linked to bone morphogenic protein-2 (BMP-2) in rat vascular smooth muscle (VSM) cells with noncompetitive format and analyzed by CE-CL. HRP-Ab(2)-mAb-BMP-2 complexes can be baseline separated from free HRP in 3 min. The detection limit (S/N = 3) of BMP-2 is 6.2 pM (75 zmol). This technique has been successfully applied to arteriosclerosis development mechanistic study by investigating the change of BMP-2 content in VSM cells, which were stimulated by angiotensin II for different times. The change trends of BMP-2 contents are well in accord with that of the commonly used pathology image analysis system. It proves that the CEIA-CL technique proposed could be developed into a sensitive and new method for clinical assay and pathology research.
authors.affiliation: Department of Chemistry, Wuhan University, Wuhan 430072, China.
authors.forename: Junhua
authors.initials: J
authors.lastname: Wang
authors.forename: Weihua
authors.initials: W
authors.lastname: Huang
authors.forename: Yanming
authors.initials: Y
authors.lastname: Liu
authors.forename: Jieke
authors.initials: J
authors.lastname: Cheng
authors.forename: Jing
authors.initials: J
authors.lastname: Yang
mesh_terms: D000818:Animals; D055396:Bone Morphogenetic Protein 2; D019485:Bone Morphogenetic Proteins / Q000032:analysis* / Q000737:chemistry* / Q000378:metabolism; D002478:Cells, Cultured; D019075:Electrophoresis, Capillary / Q000379:methods*; D006863:Hydrogen-Ion Concentration; D007118:Immunoassay / Q000379:methods*; D049449:Luminescence; D009131:Muscle, Smooth, Vascular / Q000166:cytology* / Q000378:metabolism*; D051381:Rats; D012680:Sensitivity and Specificity; D016212:Transforming Growth Factor beta / Q000032:analysis* / Q000737:chemistry* / Q000378:metabolism
chemical_list: C525720:Bmp2 protein, rat; D055396:Bone Morphogenetic Protein 2; D019485:Bone Morphogenetic Proteins; D016212:Transforming Growth Factor beta