Infectious Virus Tracking by Fluorescent Live Cell Imaging in Primary Cells

Area of Science:

• Virology
• Cell Biology
• Infectious Diseases

Background:

• Human immunodeficiency virus type 1 (HIV-1) infection is a complex process involving host barriers and cellular cofactors.
• Most HIV-1 viral particles are nonproductive, leading to degradation or cellular accumulation, making infection analysis difficult.
• Traditional methods struggle to differentiate between behaviors of infectious and non-infectious viral particles.

Purpose of the Study:

• To develop and describe a novel method for tracking individual HIV-1 particles.
• To link the behavior of single viral particles to their infectivity in real-time.
• To overcome the inefficiencies of traditional methods in studying HIV-1 infection dynamics.

Main Methods:

• Development of an infectious virus tracking method using live-cell imaging.
• Quantification of individual fluorescent viral particles over time.
• Application of ultra-low multiplicity of infection (MOI) to monitor individual viral particle outcomes.

Main Results:

• The method successfully detects and quantifies individual fluorescent HIV-1 particles.
• Viral particle behavior can be directly correlated with the outcome of infection.
• Distinguishes productive viral behaviors from nonproductive ones at the single-particle level.

Conclusions:

• The described method provides a powerful tool to study HIV-1 infection at the single-particle level.
• This approach enhances our understanding of HIV-1 entry and infection dynamics.
• It offers a more accurate way to assess viral infectivity compared to traditional bulk methods.