Quantitation of defective and ecotropic viruses during LP-BM5 infection by real time PCR and RT-PCR

Area of Science:

• Virology
• Immunology
• Molecular Biology

Background:

• Murine AIDS (MAIDS) is a T-cell immunodeficiency induced by the LP-BM5 retroviral mixture in mice.
• The LP-BM5 mixture contains a replication-defective virus (BM5d) and a replication-competent helper virus (BM5e).
• Accurate quantification of viral components is crucial for understanding MAIDS pathogenesis and evaluating therapeutic interventions.

Purpose of the Study:

• To develop and validate real-time PCR and RT-PCR assays for quantifying BM5d and BM5e proviral DNA and viral RNA.
• To monitor the dynamic changes in viral loads in blood and spleen during the early stages of MAIDS infection.
• To establish a quantitative tool for MAIDS research and treatment assessment.

Main Methods:

• Development of real-time quantitative PCR (qPCR) for proviral DNA detection.
• Development of real-time quantitative reverse transcription PCR (qRT-PCR) for viral RNA detection.
• Application of these assays to quantify BM5d and BM5e in blood (PBMC) and spleen of infected C57BL/6J mice over 8 weeks.

Main Results:

• Real-time PCR and RT-PCR assays successfully quantified BM5d and BM5e DNA and RNA.
• Viral DNA and RNA were detectable as early as 2 weeks post-infection and increased over time.
• Similar proviral DNA levels for BM5d and BM5e were observed in PBMCs and spleen.
• Higher viral RNA levels of BM5e compared to BM5d were detected in both tissues throughout the infection period.

Conclusions:

• The developed real-time PCR and RT-PCR assays are effective tools for quantifying MAIDS-associated viruses.
• These assays provide valuable insights into the viral kinetics during MAIDS progression.
• The quantitative data can facilitate the evaluation of antiviral strategies and the study of MAIDS pathogenesis.