Human aldolase B subunit-specific radioimmunoassay.

Area of Science:

• Biochemistry
• Clinical Chemistry
• Immunology

Background:

• Aldolase B is a key enzyme in gluconeogenesis, primarily found in the liver.
• Accurate quantification of aldolase B is crucial for diagnosing liver-related diseases.
• Existing methods for aldolase B measurement may lack specificity or sensitivity.

Purpose of the Study:

• To develop and validate a direct radioimmunoassay for quantifying aldolase B in human serum and tissues.
• To assess the specificity of the assay for aldolase B subunit.
• To evaluate the potential diagnostic utility of serum aldolase B levels in liver diseases.

Main Methods:

• Development of a double antibody radioimmunoassay using radioiodinated aldolase B homopolymer.
• Utilized chicken antibodies to aldolase B and rabbit antibodies to chicken IgG.
• Tested specificity against human aldolase A and aldolase C subunits.

Main Results:

• The radioimmunoassay demonstrated high specificity for aldolase B, with no cross-reactivity with aldolase A or C.
• The assay's lower limit of quantification was 2 ng/ml.
• Normal serum aldolase B levels ranged from 23-38 ng/ml (mean 28.5 ng/ml).
• Elevated serum aldolase B (>30 ng/ml) was observed in most hepatitis patients.
• Slight elevations were noted in metastatic liver cancer and primary liver cell carcinoma patients.

Conclusions:

• The developed radioimmunoassay provides a specific and sensitive method for aldolase B quantification.
• Serum aldolase B levels show potential as a biomarker for hepatitis and certain liver cancers.
• Further research can explore aldolase B's role in liver disease pathogenesis and diagnosis.