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Related Experiment Videos

Decrease in cytokine production by HIV-infected macrophages in response to LPS-mediated activation.

W P Tsai1, K Hirose, P L Nara

  • 1Laboratory of Biochemical Physiology, PRI/DynCorp, National Cancer Institute-Frederick Cancer Research and Development Center, MD 21702-1201.

Lymphokine and Cytokine Research
|December 1, 1991
PubMed
Summary
This summary is machine-generated.

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Human immunodeficiency virus-1 (HIV-1) infection suppresses the ability of monocytes/macrophages to produce key immune-signaling molecules. This impaired cytokine production impacts the body's response to bacterial stimuli like lipopolysaccharide (LPS).

Area of Science:

  • Immunology
  • Virology
  • Cell Biology

Background:

  • Human immunodeficiency virus-1 (HIV-1) infects monocytes/macrophages (M/M), critical immune cells.
  • Cytokines play a vital role in regulating immune responses and are implicated in HIV-1 pathogenesis.

Purpose of the Study:

  • To investigate the effect of HIV-1 infection on the cytokine production capacity of human M/M.
  • To determine how HIV-1 impacts the response of M/M to lipopolysaccharide (LPS) stimulation.

Main Methods:

  • Human M/M were infected with an HIV-1 isolate.
  • mRNA levels for various cytokines (IL-1α, IL-1β, TNF-α, IL-6, IL-8, MCAF) were measured post-infection and after LPS stimulation.
  • Protein levels of IL-8 were quantified using radioimmunoassay over an 18-day culture period.

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Main Results:

  • HIV-1 infection alone increased mRNA levels for IL-1β, TNF-α, IL-6, and IL-8.
  • LPS-induced mRNA levels for IL-1α, IL-1β, TNF-α, IL-6, IL-8, and MCAF were significantly decreased in HIV-1 infected M/M compared to uninfected cells.
  • HIV-1 infected M/M produced lower amounts of IL-8 protein throughout the culture period.

Conclusions:

  • HIV-1 infection generally suppresses the lipopolysaccharide (LPS)-inducible cytokine production in human monocytes/macrophages.
  • The impaired cytokine response may have significant implications for immune function and pathogenesis during HIV-1 infection.