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Acanthamoeba culbertsoni elicits soluble factors that exert anti-microglial cell activity

Jenica L Harrison1, Gabriela A Ferreira, Erinn S Raborn

  • 1Department of Microbiology and Immunology, Virginia Commonwealth University, School of Medicine, 1101 E. Marshall Street, Richmond, VA 23298-0678, USA.

Infection and Immunity
|July 8, 2010
PubMed

Insights

Acanthamoeba culbertsoni degrades immune signals and induces cell death in microglia, contributing to granulomatous amoebic encephalitis (GAE). This pathogen employs strategies to evade the central nervous system

Area of Science:

  • Neuroimmunology
  • Infectious Diseases
  • Cell Biology

Background:

  • Acanthamoeba culbertsoni is an opportunistic pathogen causing granulomatous amoebic encephalitis (GAE).
  • GAE is a severe central nervous system (CNS) disease characterized by inflammatory granulomas.
  • Microglia and macrophages are key immune cells involved in the host response to CNS pathogens.

Purpose of the Study:

  • To investigate the mechanisms by which Acanthamoeba culbertsoni interacts with and evades immune cells in the CNS.
  • To determine if A. culbertsoni can degrade immune mediators produced by microglia.
  • To assess the impact of A. culbertsoni on macrophage-like cell viability.

Main Methods:

  • Coculture of A. culbertsoni with mouse microglial cell line (BV-2 cells).
  • Analysis of chemokine and cytokine degradation by A. culbertsoni secreted factors.
  • Induction of apoptosis in microglia and primary neonatal rat cerebral cortex microglia using soluble factors from cocultures.

Main Results:

  • A. culbertsoni secretes serine peptidases capable of degrading microglial-derived chemokines and cytokines.
  • Soluble factors from A. culbertsoni cocultures induced apoptosis in BV-2 cells and primary microglia.
  • These findings suggest A. culbertsoni employs cell contact-independent mechanisms to target anti-amoeba immune cells.

Conclusions:

  • Acanthamoeba culbertsoni actively subverts the host immune response in the CNS.
  • The pathogen degrades key immune signaling molecules and induces apoptosis in microglia/macrophages.
  • These immune evasion strategies contribute to the pathogenesis of granulomatous amoebic encephalitis.

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