A simple and sensitive radioimmunoassay for adenosine.

Area of Science:

• Biochemistry
• Immunology
• Analytical Chemistry

Background:

• Adenosine is a vital nucleoside with significant physiological roles.
• Accurate quantification of adenosine is essential for various biological and clinical studies.
• Existing methods for adenosine measurement may have limitations in sensitivity or practicality.

Purpose of the Study:

• To develop and validate a simple and sensitive radioimmunoassay (RIA) for the quantification of adenosine.
• To establish optimal conditions for adenosine measurement in biological samples, particularly plasma.
• To compare the performance of the developed RIA with a high-performance liquid chromatography (HPLC) method.

Main Methods:

• Development of a double antibody RIA using a specific anti-adenosine antiserum.
• Utilized adenosine 2', 3'-0-disuccinyl-3-[125I]-iodotyrosine methyl ester (diSc-adenosine-[125I]-TME) as a radiotracer.
• Optimization of sample handling for plasma adenosine determination, including specific inhibitors and temperature control.

Main Results:

• The developed RIA demonstrated high sensitivity, detecting adenosine in the range of 6.25-400 pmol/ml.
• RIA results showed excellent correlation with HPLC analysis (correlation coefficient of 0.997).
• Accurate adenosine quantification in human plasma was achieved, even without deproteinization, with specific protocols for sample preparation.

Conclusions:

• The developed RIA is a simple, sensitive, and reliable method for adenosine quantification.
• The method is suitable for determining adenosine levels in biological fluids like plasma.
• This RIA offers a valuable tool for research involving adenosine metabolism and signaling.