title: Bioluminescence immunoassay for angiotensin II using aequorin as a label.
abstract: Angiotensin II is a biologically active component of the renin-angiotensin system. High levels of angiotensin II may be responsible for hypertension and heart failure because they increase systemic vascular resistance, arterial pressure, and sodium and fluid retention. Therefore, it is important to monitor angiotensin II levels for the treatment of hypertension and heart diseases. The goal of this work was to develop a bioluminescence immunoassay using aequorin as a label to measure angiotensin II levels in human plasma. This method utilizes a genetically engineered fusion protein between angiotensin II and aequorin. For that, the C terminus of angiotensin II was fused to the N terminus of apoaequorin using molecular biology techniques. A heterogeneous immunoassay was then developed for the determination of angiotensin II. A detection limit of 1 pg/mL was obtained with the optimized assay, allowing for the determination of angiotensin II at physiological levels in human plasma.
authors.affiliation: Department of Chemistry, University of Kentucky, Lexington, KY 40506, U.S.A.
authors.forename: Xiaoge
authors.initials: X
authors.lastname: Qu
authors.forename: Sapna K
authors.initials: SK
authors.lastname: Deo
authors.forename: Emre
authors.initials: E
authors.lastname: Dikici
authors.forename: Mark
authors.initials: M
authors.lastname: Ensor
authors.forename: Michael
authors.initials: M
authors.lastname: Poon
authors.forename: Sylvia
authors.initials: S
authors.lastname: Daunert
mesh_terms: D000331:Aequorin / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism; D000804:Angiotensin II / Q000097:blood*; D006801:Humans; D007118:Immunoassay / Q000379:methods*; D049408:Luminescent Agents / Q000737:chemistry* / Q000378:metabolism; D008163:Luminescent Measurements; D011993:Recombinant Fusion Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism
chemical_list: D049408:Luminescent Agents; D011993:Recombinant Fusion Proteins; D000804:Angiotensin II; D000331:Aequorin