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Immunoreactive adrenomedullin in human plasma

K Kitamura¹, Y Ichiki, M Tanaka

¹First Department of Internal Medicine, Miyazaki Medical College, Japan.

|March 21, 1994

Summary

A new radioimmunoassay accurately measures adrenomedullin (ADM) in human plasma. Elevated ADM levels correlate with hypertension severity, suggesting its role in the condition.

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Area of Science:

Endocrinology
Cardiovascular Research
Biochemical Assays

Background:

Adrenomedullin (ADM) is a peptide hormone with vasodilatory and natriuretic properties.
Circulating ADM levels and their association with cardiovascular diseases require precise measurement techniques.

Purpose of the Study:

To develop and validate a specific and sensitive radioimmunoassay (RIA) for human adrenomedullin.
To investigate plasma ADM concentrations in healthy individuals and hypertensive patients.

Main Methods:

Development of a radioimmunoassay utilizing radioiodinated ADM.
Validation of the assay's specificity, sensitivity, and cross-reactivity.
Measurement of plasma ADM-like immunoreactivity using gel-filtration and HPLC chromatography.

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Main Results:

The developed RIA demonstrated high sensitivity (4 fmol/tube) and specificity for intact ADM.
Plasma ADM levels in healthy individuals were found to be 3.3 +/- 0.39 fmol/ml.
Hypertensive patients exhibited significantly increased plasma ADM levels, with concentrations rising proportionally to disease severity.

Conclusions:

A reliable RIA for quantifying circulating adrenomedullin has been established.
Circulating ADM is predominantly the intact molecule, similar to synthetic ADM.
Elevated plasma ADM is a biomarker associated with hypertension and its severity.