Bioluminescence immunoassay for angiotensin II using aequorin as a label

Xiaoge Qu, Sapna K. Deo, Emre Dikici, Mark Ensor, Michael Poon, Sylvia Daunert

Research output: Contribution to journalArticle

9 Scopus citations

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.

Original languageEnglish (US)
Pages (from-to)154-161
Number of pages8
JournalAnalytical Biochemistry
Volume371
Issue number2
DOIs
StatePublished - Dec 15 2007
Externally publishedYes

Keywords

  • Aequorin
  • Angiotensin II
  • Bioluminescence immunoassay
  • Reporter protein

ASJC Scopus subject areas

  • Biochemistry
  • Biophysics
  • Molecular Biology

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