[Radioimmunologic methods for determining cortisol binding globulin-CBG in human serum]

Area of Science:

• Endocrinology
• Immunochemistry
• Biochemical Assays

Background:

• Cortisol binding globulin (CBG), also known as transcortin, is a key protein in regulating cortisol bioavailability.
• Previous methods for CBG quantification had limitations, necessitating the development of more precise techniques.

Purpose of the Study:

• To develop and validate a double antibodies radioimmunoassay for determining human cortisol binding globulin serum levels.
• To support previous work on the isolation and purification of transcortin and the production of anti-transcortin antibodies.

Main Methods:

• Production of anti-transcortin antibodies through rabbit immunization.
• Iodination of the antigen using the chloramine-T method.
• Purification of the iodinated antigen on an Ultragel AcA 54 column.
• Establishment of a standard curve with specific Bx/Box100%.

Main Results:

• The developed double antibodies radioimmunoassay demonstrated high specificity.
• The purification method yielded high-quality antigen for radioimmunoassay.
• The assay provided precise and reproducible measurements of serum transcortin levels.

Conclusions:

• The described double antibodies radioimmunoassay is a precise and repetitive method for investigating human cortisol binding globulin serum levels.
• This assay is a valuable tool for endocrine research and clinical diagnostics related to cortisol regulation.