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Age-matched controls were also identified by IRB-approved search of the electronic medical record and were defined as individuals who had been treated with an ACE inhibitor for at least 6?months without experiencing angioedema. Based on the anticipated prevalence of black Americans among cases, controls were prespecified to be 50% black Americans and 50% white Americans. We also specified 50% of controls to be women. Medical history, including the history of angioedema, was confirmed by a research nurse or physician using a detailed case report form. Per protocol, blood for DNA and biochemical assays was collected from cases and controls. Blood was collected in the absence of anticoagulant, centrifuged immediately, and stored at ?80��C until assay. http://www.selleckchem.com/products/PD-0325901.html Dipeptidyl peptidase IV activity was assayed by incubating http://www.selleck.cn/products/Cisplatin.html sera with a colorimetric substrate, l-glycyl-l-prolyl p-nitroanilide (Sigma, St. Louis, MO, USA), at 37��C, as previously described (14). Human aortic endothelial cells (Invitrogen, Carlsbad, CA, USA) were plated in 96-well dishes and cultured to confluency in Medium-200 (Invitrogen) supplemented with 2% fetal bovine serum, 1?��g/ml hydrocortisone, 10?ng/ml human epidermal growth factor, 3?ng/ml basic fibroblast growth factor, and 10?��g/ml heparin. Confluent cells were treated for 24?h with agents commonly used in transplantation at concentrations similar to therapeutic concentrations in serum. The concentration of sirolimus was 15?ng/ml (16.4?nM), tacrolimus 15?ng/ml (18.7?nM), and cyclosporine A 200?ng/ml (166.3?nM) (all from Sigma) (15). As a vehicle control, cells were treated with 0.01% dimethyl sulfoxyl (DMSO). Cell-surface DPPIV activity was measured using a modification of the assay described earlier. Briefly, adherent cells were washed once with PBS to remove residual media. Cells were then incubated with 1?mM l-glycyl-l-prolyl p-nitroanilide (Sigma) as the substrate in 0.1?M Tris�CHCl http://www.selleckchem.com/products/3-methyladenine.html (pH 8.0) assay buffer for 60?min at 37��C. Dipeptidyl peptidase IV activity was assessed by measuring the rate of change in absorbance at 405?nm. The specificity of the assay on adherent cells was verified with 200?��M Diprotin A (Sigma), a selective DPPIV inhibitor (16, 17). We conducted an IRB-approved review of the electronic medical record of 320 consecutive renal transplant patients (from January 1, 2005 through July 7, 2007) and 51 consecutive cardiac transplant patients (from January 1, 2005 through February 12, 2008) at Vanderbilt to determine the incidence of angioedema in transplant patients taking an ACE inhibitor. Results are presented as means?��?standard deviations. For univariate analysis, continuous variables were compared using Student��s t test or the Wilcoxon rank sum test depending on the normality. Discrete variables were compared using either the Chi-square test or Fisher exact test, if one cell contained fewer than 5. Risk factors for ACE inhibitor-associated angioedema were then evaluated by logistic regression. A P-value