Michael Poon

Icahn School of Medicine at Mount Sinai, Manhattan, New York, United States

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Publications (3)8.4 Total impact

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    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.
    Analytical Biochemistry 01/2008; 371(2):154-61. · 2.58 Impact Factor
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    ABSTRACT: This work describes a solid-phase immunoassay for 6-keto-prostaglandin F1alpha, the stable hydrolysis product of prostacyclin (prostaglandin I2). Prostacyclin, a potent vasodilator with antiplatelet and antiproliferative properties is an effective treatment for primary pulmonary hypertension and pulmonary arterial hypertension associated with scleroderma and scleroderma-like syndrome. Levels of 6-keto-prostaglandin F1alpha can be directly correlated with levels of prostacyclin. Therefore, 6-keto-prostaglandin F1alpha, has become the indicator of choice to measure prostacyclin levels. The single-step immunoassay for 6-keto-prostaglandin F1alpha reported here was developed using the bioluminescent protein aequorin as a label. Analyte-label conjugates were constructed by linking the carboxyl group of 6-keto-prostaglandin F1alpha and lysine residues of aequorin by chemical conjugation methods. The binding properties of 6-keto-prostaglandin F1alpha toward its antibody and the bioluminescent properties of aequorin were retained in the conjugate, which was then used to generate a dose-response curve for the analyte in a convenient microtiter plate format. The concentration of 6-keto-prostaglandin F1alpha after extraction from plasma showed good correlation with the concentration of 6-ketoprostaglandin F1alpha obtained without prior extraction of the same plasma sample. This measurement demonstrated that the assay allows the measurement of 6-keto-prostaglandin F1alpha directly in plasma without any pretreatment of the samples, which results in a much simpler method with a faster assay time.
    Analytical Chemistry 09/2002; 74(15):3892-8. · 5.82 Impact Factor
  • Analytical Chemistry - ANAL CHEM. 01/2002; 74(15):3892-3898.

Publication Stats

12 Citations
8.40 Total Impact Points

Institutions

  • 2008
    • Icahn School of Medicine at Mount Sinai
      Manhattan, New York, United States
  • 2002–2008
    • University of Kentucky
      • Department of Chemistry
      Lexington, KY, United States