Highly sensitive enzyme immunoassay for human brain aldolase C

Area of Science:

• Biochemistry
• Immunology
• Enzyme Assays

Background:

• Aldolase C4 is the brain-type isozyme of human aldolase.
• Specific detection of aldolase C4 is crucial for diagnosing certain neurological and cardiac conditions.

Purpose of the Study:

• To develop a sensitive sandwich-type enzyme immunoassay for human aldolase C4.
• To validate the specificity and precision of the developed immunoassay.
• To determine normal serum levels and tissue distribution of aldolase C4.

Main Methods:

• Purified antibodies specific to the aldolase C subunit were generated and purified.
• A sandwich enzyme immunoassay was constructed using immobilized antibody F(ab')2 fragments and beta-D-galactosidase-labeled Fab' fragments.
• Immunoaffinity chromatography was used for antibody purification.

Main Results:

• The assay demonstrated high sensitivity with a minimum detection limit of 3 pg/tube for aldolase C4.
• The immunoassay showed high specificity for the aldolase C subunit, with minimal cross-reactivity with other aldolase isozymes.
• Intra-assay and inter-assay coefficients of variation were ≤11%, indicating good precision.
• Normal serum aldolase C levels in healthy adults ranged from 8.74-18.9 ng/ml.
• High concentrations of aldolase C4 were found in the central nervous system and heart, with significant levels in the liver, adrenal glands, and testis.

Conclusions:

• A highly sensitive and specific enzyme immunoassay for human aldolase C4 has been successfully developed.
• The assay's precision and specificity make it suitable for clinical applications.
• Measurement of aldolase C4 in serum or cerebrospinal fluid may assist in the diagnosis of neurological disorders and acute myocardial damage.