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A rapid, sensitive, and easy-to-perform solid phase insulin radioimmunoassay
J E Väänänen1, A M Buchan, R A Pederson
1Medical Research Council Regulatory Peptide Group, University of British Columbia, Faculty of Medicine, Vancouver, Canada.
Life Sciences
|January 1, 1992
Summary
A new Solid-phase-RadioImmunoAssay (SPRIA) offers sensitive and accurate basal insulin measurement. This method is ideal for quantifying insulin from various biological samples with reduced waste compared to traditional assays.
Area of Science:
- Endocrinology
- Biochemistry
- Assay Development
Background:
- Accurate basal insulin measurement is crucial for understanding pancreatic beta-cell function.
- Existing radioimmunoassay (RIA) methods present challenges in sensitivity, range, and waste generation.
Purpose of the Study:
- To develop a novel, sensitive, and efficient assay for quantifying insulin release.
- To provide an alternative to conventional RIA with improved performance and reduced environmental impact.
Main Methods:
- Development of a Solid-phase-RadioImmunoAssay (SPRIA) using 125I-insulin and immobilized antibodies.
- Validation of the assay across a broad concentration range (1-64 microU/ml) with assessment of inter- and intra-assay variation.
- Comparison of SPRIA with traditional RIA using rat and human oral glucose tolerance tests (oGTT) and insulin recovery studies.
Main Results:
- The SPRIA demonstrated high sensitivity and a broad useful range with low inter- and intra-assay variability (approx. 5%).
- SPRIA showed excellent correlation with RIA for both rat and human plasma insulin levels (r2 = 0.990 and <= 3.7% SEM, respectively).
- The assay effectively measured insulin from acid extracts and reduced radioactive and glass waste.
Conclusions:
- The developed SPRIA is a simple, sensitive, and robust method for insulin quantification.
- SPRIA is suitable for various sample types including isolated islets, beta-cells, acid extracts, and plasma.
- This assay offers a more efficient and environmentally friendly alternative to conventional RIA for insulin measurement.