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Variables affecting production of monocyte chemotactic factor 1 from human leukocytes stimulated with Cryptococcus

S M Levitz1, E A North, Y Jiang

  • 1Evans Memorial Department of Clinical Research, Boston Medical Center, Massachusetts 02118, USA. slevitz@med-med1.bu.edu

Infection and Immunity
|March 1, 1997
PubMed

Insights

Cryptococcus neoformans strongly induces monocyte chemoattractant protein 1 (MCP-1) in monocytes but not in bronchoalveolar macrophages (BAM). This finding is crucial for understanding immune responses to fungal infections, particularly in immunocompromised individuals.

Area of Science:

  • Immunology
  • Infectious Diseases
  • Cell Biology

Background:

  • Monocyte chemoattractant protein 1 (MCP-1) is vital for recruiting monocytes and T cells to infection sites.
  • Cryptococcus neoformans is a significant pathogen, especially in individuals with compromised cell-mediated immunity like AIDS patients.
  • Understanding MCP-1 production by immune cells in response to C. neoformans is critical for host defense mechanisms.

Purpose of the Study:

  • To investigate the conditions under which human monocytes and bronchoalveolar macrophages (BAM) produce MCP-1 when stimulated by C. neoformans.
  • To compare the MCP-1-inducing capacity of C. neoformans with lipopolysaccharide (LPS).
  • To explore variations in MCP-1 induction based on C. neoformans strains and growth conditions.

Main Methods:

  • Human monocytes and BAM were isolated and exposed to C. neoformans and LPS.
  • MCP-1 release and mRNA levels were quantified using appropriate assays.
  • Nine different strains of C. neoformans were utilized to assess variability in stimulation.

Main Results:

  • C. neoformans potently induced MCP-1 release from monocytes, comparable to LPS stimulation.
  • BAM were stimulated by LPS but not by C. neoformans to release MCP-1.
  • MCP-1 mRNA levels in monocytes peaked at 8 hours post-stimulation with C. neoformans.
  • MCP-1 release was observed across nine C. neoformans strains, with modest inter-strain variation.
  • Fungal growth conditions influenced the capacity of C. neoformans to stimulate monocyte MCP-1 release.
  • Monocytes from HIV-infected and uninfected donors showed comparable MCP-1 release in response to C. neoformans.

Conclusions:

  • C. neoformans is a potent inducer of MCP-1 in human monocytes but fails to stimulate MCP-1 production in BAM.
  • The differential response of monocytes and BAM to C. neoformans in MCP-1 production may impact the inflammatory response in pulmonary cryptococcosis.
  • Impaired MCP-1 release from BAM in vivo could lead to a diminished cell-mediated inflammatory response to inhaled C. neoformans.

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