Related Experiment Videos

Expression of macrophage products after in vitro infection of human monocytes/macrophages with HIV

W Glienke1, H von Briesen, R Esser

  • 1Georg-Speyer-Haus, Chemotherapeutisches Forschungsinstitut, Frankfurt am Main, Germany.

Research in Virology
|January 1, 1993
PubMed

Insights

HIV infection alters how monocytes/macrophages respond to stimuli. Interleukin-8 (IL8) expression significantly increases in infected cells after lipopolysaccharide (LPS) stimulation, while c-sis expression decreases with interferon-gamma (IFN gamma).

Area of Science:

  • Immunology
  • Virology
  • Cell Biology

Background:

  • Monocytes/macrophages (MO/MAC) play a crucial role in immune responses and are targets of Human Immunodeficiency Virus (HIV).
  • Understanding how HIV infection affects MO/MAC responses to immune stimuli like lipopolysaccharide (LPS) and interferon-gamma (IFN gamma) is vital for comprehending viral pathogenesis.

Purpose of the Study:

  • To investigate the impact of in vitro HIV infection on the expression of macrophage-specific products in response to LPS and IFN gamma stimulation.
  • To quantify changes in macrophage-colony-stimulating factor (M-CSF), c-fms, c-sis, tissue factors, transforming growth factor-beta (TGF beta), and interleukin-8 (IL8).

Main Methods:

  • In vitro infection of monocytes/macrophages with HIV.
  • Stimulation of infected and uninfected cells with LPS and IFN gamma.
  • Quantitative analysis of macrophage-specific product expression using molecular techniques.

Main Results:

  • HIV-infected cells showed significantly elevated expression of interleukin-8 (IL8) upon LPS stimulation, peaking at 4 hours.
  • Uninfected control cells exhibited only weak IL8 expression at the same time point.
  • Expression of tissue factor, c-fms, M-CSF, and TGF beta remained largely unchanged in infected cells after stimulation.
  • In contrast, c-sis expression was significantly lower in HIV-infected cells stimulated with IFN gamma compared to controls.

Conclusions:

  • HIV infection profoundly alters the inflammatory response of monocytes/macrophages, particularly concerning IL8 production.
  • The differential modulation of specific products like IL8 and c-sis suggests complex regulatory mechanisms influenced by HIV.
  • These findings contribute to understanding immune dysregulation in HIV infection and potential therapeutic targets.

Related Concept Videos