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A transmissible cytotoxic activity isolated from a patient with brain ischemia causes microglial cell activation and

F Beretti1, V Cenacchi, M Portolani

  • 1Dipartimento Integrato dei Servizi Diagnostici, di Laboratorio e di Medicina Legale, Università degli Studi di Modena e Reggio Emilia, Via del Pozzo 87, 41100 Modena, Italy.

Cellular and Molecular Neurobiology
|March 24, 2007
PubMed

Insights

Transmissible cytotoxic activity (TCA) from ischemic brain injury enhances microglial phagocytosis but impairs fungal killing and alters immune secretions. This suggests TCA causes microglial dysfunction.

Area of Science:

  • Neuroscience
  • Immunology
  • Cell Biology

Background:

  • Microglial cells are crucial immune cells in the central nervous system, activated during brain injury and neurological disorders.
  • Transmissible cytotoxic activity (TCA), potentially linked to misfolded proteins, has been identified in cerebrospinal fluid from ischemic stroke patients.
  • TCA can induce apoptosis in various cell types, including microglial cells, but its specific effects on microglial immune functions are not fully understood.

Purpose of the Study:

  • To investigate the in vitro effects of TCA on the immune functions of murine microglial cells.
  • To evaluate changes in phagocytosis, antifungal activity, secretory patterns, and p38 MAPK phosphorylation in microglial cells exposed to TCA.

Main Methods:

  • Murine microglial cell line RR4 was treated with TCA.
  • Assessed phagocytosis and antifungal activity against Candida albicans.
  • Analyzed the secretory profile, including cytokine and nitric oxide production.
  • Measured the phosphorylation levels of p38 mitogen-activated protein kinase (MAPK).

Main Results:

  • TCA-treated microglial cells exhibited increased phagocytic activity compared to controls.
  • A significant decrease in the ability of TCA-treated cells to kill ingested Candida albicans was observed.
  • TCA exposure led to elevated production of macrophage inflammatory protein 1-alpha, tumor necrosis factor-alpha, and nitric oxide.
  • Phosphorylation of p38 MAPK was rapidly induced in TCA-treated cells within 30 minutes.

Conclusions:

  • TCA rapidly triggers molecular responses in microglial cells.
  • TCA exposure results in a functional impairment of microglial effector and secretory capabilities.
  • These findings highlight a novel mechanism of microglial dysfunction potentially relevant to neurological disorders associated with TCA.

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