A simple and high-throughput luciferase immunosorbent assay for both qualitative and semi-quantitative detection of anti-HIV-1 antibodies.

In this study, we described an ultrasensitive and high-throughput luciferase immunosorbent assay (LISA) for qualitative and quantitative detection of anti-HIV-1 antibody. Anti-HIV antibody in serum or plasma samples was captured by protein A/G-coated microtiter plate and detected with crude cell lysates expressing Nanoluc luciferase (Nluc) enzyme fused with HIV-1 p24 or gp41 antigen without the need of protein purification. After the addition of furimazine substrate, anti-HIV antibodies were quantitatively measured as luciferase light units. LISA showed a wide linear range of detection and was about 104-fold more sensitive than ELISA. For the detection of both anti-p24 and anti-gp41, LISA showed extraordinary sensitivity (99.5% and 100%, respectively) and equivalent specificity (100%). LISA could also monitor the change in the anti-HIV-1 antibody response over time in antiretroviral therapy (ART) treated individuals, and can sufficiently distinguish between recent and long-term HIV-1 infections. Our preliminary results indicate that LISA may provide a novel universal immunoassay platform for simultaneous HIV-1 detection, quantitative measurement of anti-HIV antibodies as well as the differentiation of HIV-1 infection stages.