Enzyme-linked immunoassay for human immunodeficiency virus type 1 envelope glycoprotein 120

Area of Science:

• Immunology
• Virology
• Biochemistry

Background:

• Human immunodeficiency virus type 1 (HIV-1) envelope glycoprotein 120 (gp120) plays a crucial role in viral entry and pathogenesis.
• Accurate quantification of gp120 is essential for understanding HIV-1 infection dynamics and developing therapeutic strategies.

Purpose of the Study:

• To develop and validate a sensitive enzyme-linked immunosorbent assay (ELISA) for quantifying human immunodeficiency virus type 1 (HIV-1) envelope glycoprotein 120 (gp120).
• To assess the utility of this ELISA for detecting gp120 in cell culture and patient samples.

Main Methods:

• Development of a capture ELISA using immobilized recombinant soluble CD4 to detect gp120.
• Detection involved a primary sheep polyclonal antibody, biotinylated anti-sheep immunoglobulin G, and an avidin-alkaline phosphatase indicator system.
• Assay performance was evaluated using reference recombinant gp120, assessing linearity, precision, and specificity.

Main Results:

• The ELISA demonstrated a linear relationship between optical density and gp120 concentrations from 60 to 6,000 pg/well.
• High accuracy was observed, with 99% correct identification of samples containing 60 pg of gp120 and no false positives.
• The assay successfully detected gp120 in HIV-1 cultured cell suspensions and sera from HIV-1 infected patients, although serum matrix affected sensitivity.

Conclusions:

• A sensitive and specific ELISA for quantifying HIV-1 gp120 has been successfully developed.
• This assay is valuable for research into the biological functions of gp120 during HIV infection.
• The developed ELISA can be applied to analyze gp120 levels in various biological matrices, including patient sera.