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Phagosome Migration and Velocity Measured in Live Primary Human Macrophages Infected with HIV-1
Published on: September 5, 2016
Human macrophages support persistent transcription from unintegrated HIV-1 DNA
Jeremy Kelly1, Margaret H Beddall, Dongyang Yu
1Department of Molecular and Microbiology, George Mason University, Manassas, Virginia 20110, USA.
Virology
|December 7, 2007
Summary
Unintegrated human immunodeficiency virus (HIV) DNA is surprisingly stable and biologically active in macrophages, unlike in T cells. This persistent viral DNA drives chemokine production, offering new insights into HIV persistence.
Area of Science:
- Virology
- Immunology
- Molecular Biology
Background:
- Retroviruses, including HIV, typically require genome integration for stability and replication.
- In resting CD4 T cells, impaired integration limits HIV DNA activity and survival.
- Unintegrated HIV DNA diminishes rapidly in dividing T cells.
Purpose of the Study:
- To investigate the stability and biological activity of unintegrated HIV DNA in macrophages.
- To explore viral gene transcription and protein synthesis from unintegrated HIV DNA in macrophages.
- To determine if HIV infection of macrophages generates chemokines independently of integration.
Main Methods:
- In vitro HIV infection of primary human macrophages.
- Analysis of unintegrated viral DNA forms (linear, 1-LTR, 2-LTR circles) over time.
- Quantification of viral gene transcription and protein synthesis (Nef).
- Measurement of chemokine production by infected macrophages.
Main Results:
- Unintegrated HIV DNA (linear, 1-LTR, 2-LTR circles) demonstrated remarkable stability in macrophages for at least 30 days.
- Persistent, selective viral gene transcription occurred, favoring early genes like nef and tat.
- The viral protein Nef was measurably synthesized from unintegrated DNA.
- HIV infection of macrophages induced the generation of numerous chemokines, independent of viral integration.
Conclusions:
- Macrophages provide a unique cellular environment supporting the stability and biological activity of unintegrated HIV DNA.
- Persistent transcription and Nef synthesis from unintegrated HIV DNA contribute to viral persistence and potentially host immune modulation.
- HIV-induced chemokine production in macrophages may play a role in viral pathogenesis and dissemination.
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