Electroimmunoassay of factor VII antigen

Area of Science:

• Biochemistry
• Immunology
• Hematology

Background:

• Factor VII is a crucial clotting protein.
• Congenital factor VII deficiency can lead to bleeding disorders.
• Accurate detection of factor VII antigen is essential for diagnosis.

Purpose of the Study:

• To develop a highly sensitive immunoelectrophoresis method for detecting human factor VII antigen.
• To evaluate the utility of this method in diagnosing congenital factor VII deficiency.

Main Methods:

• Utilized 125I-labelled anti-factor VII antibody in Laurell immunoelectrophoresis.
• Developed a direct electrophoresis technique on agarose gel containing antiserum and labelled antibody.
• Employed autoradiography for enhanced detection of precipitating arcs (rockets).

Main Results:

• The enhanced immunoelectrophoresis method demonstrated high sensitivity, detecting factor VII antigen from standard reference plasma.
• A distinct precipitating arc (rocket) was visualized after autoradiography.
• In four patients with congenital factor VII deficiency, three showed no detectable factor VII antigen, and one had reduced levels.

Conclusions:

• The developed 125I-labelled antibody immunoelectrophoresis is a sensitive and effective method for quantifying factor VII antigen.
• This technique aids in the diagnosis of congenital factor VII deficiency by identifying absent or reduced factor VII antigen levels.