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[Enzyme immunoassay for serum 18-hydroxycorticosterone and its clinical application]
Nihon Naibunpi Gakkai Zasshi
|October 20, 1985
Summary
This study developed a sensitive enzyme immunoassay for serum 18-hydroxycorticosterone, aiding in diagnosing conditions like aldosterone-producing adenoma and essential hypertension.
Area of Science:
- Endocrinology
- Biochemistry
- Assay Development
Context:
- 18-hydroxycorticosterone is a key steroid hormone.
- Accurate measurement is crucial for diagnosing adrenal disorders.
- Existing assays may have limitations.
Purpose:
- To establish a sensitive and reliable enzyme immunoassay (EIA) for serum 18-hydroxycorticosterone.
- To validate the assay's performance characteristics.
- To assess the clinical utility of the EIA in various patient groups.
Summary:
- An alkaline phosphatase-labeled EIA was developed using specific antiserum.
- Sephadex LH-20 chromatography facilitated steroid separation.
- The assay demonstrated high sensitivity (50 pg/tube) and a wide measurable range (5-1000 ng/dl).
- Intra- and inter-assay coefficients of variation were low (5.0% and 5.8%).
- Elevated levels were observed in patients with aldosterone-producing adenoma.
- Serum 18-hydroxycorticosterone levels responded appropriately to ACTH and dexamethasone.
- The assay showed potential for monitoring essential hypertensive patients.
Impact:
- Provides a sensitive, radioisotope-free method for clinical use.
- Facilitates diagnosis and management of endocrine hypertension.
- Supports understanding of adrenal steroidogenesis regulation.