An avidin-biotin micro-enzymeimmunoassay for monkey chorionic gonadotrophin

Area of Science:

• Reproductive Biology
• Primate Endocrinology
• Immunoassay Development

Background:

• Accurate measurement of chorionic gonadotropin (CG) is crucial for monitoring primate pregnancy.
• Existing radioimmunoassay methods can be complex and time-consuming.
• Development of a more accessible and efficient immunoassay is needed.

Purpose of the Study:

• To develop and validate a novel avidin-biotin micro-enzyme immunoassay (EIA) for quantifying monkey CG.
• To assess the assay's specificity and accuracy in detecting CG in primate serum.
• To compare CG profiles during early pregnancy across different monkey species using the developed EIA.

Main Methods:

• An avidin-biotin micro-enzyme immunoassay was designed using specific reagents including antiserum to ovine LH beta-subunit and biotinylated hCG.
• Assay specificity was confirmed by testing serum samples with high luteinizing hormone (LH) levels.
• Serum samples were pre-heated to mitigate false positive results, and the assay was performed on bonnet, cynomolgus, and rhesus monkeys.

Main Results:

• The developed EIA demonstrated high accuracy (97%) in detecting CG in bonnet monkeys, with 10 true positives, 34 true negatives, and only 1 false positive.
• Prior heating of serum samples effectively reduced false positive results, enhancing assay reliability.
• Serum CG profiles obtained via EIA during early pregnancy in bonnet, cynomolgus, and rhesus monkeys closely mirrored those previously reported using radioimmunoassay.

Conclusions:

• The avidin-biotin micro-EIA is a specific, accurate, and reliable method for measuring monkey CG.
• This EIA provides a valuable tool for studying reproductive physiology and pregnancy monitoring in non-human primates.
• The assay's performance is comparable to established radioimmunoassay techniques, offering a potentially more practical alternative.