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Cytoskeleton and Rho GTPases as targets of Streptococcus pneumoniae pneumolysin in meningitis and CNS dysfunction

Subject Area Pharmacology
Term from 2007 to 2014
Project identifier Deutsche Forschungsgemeinschaft (DFG) - Project number 50622976
 
Final Report Year 2014

Final Report Abstract

The project by the DFG Emmy Noether Programme allowed us to design, organize and implement a research plan that revealed important aspects of the behavior of the cholesterol-dependent cytolysin pneumolysin in disease conditions. The combination between artificial membrane models, cell cultures, slice cultures, animal and human brain sample experiments allowed to establish a translational approach that generated substantial amount of results. These are: 1. In sub-lytic concentrations, pneumolysin can alter the actin cytoskeleton by direct transmembrane interaction with actin through the membrane. In primary astrocytes, the activation of small GTPases occurs secondary to the actin changes. 2. Pore forming capacity remains critically important for the cytoskeleton alterations by pneumolysin even when no cell lysis is observed. 3. Moderate changes in the extracellular calcium concentrations can have profound effects on the lytic capacity of the toxin. 4. Pneumolysin plays critical role in pneumococcal meningitis, leading to synaptic loss, dendritic damage, tissue remodeling and swelling partially in a glutamatedependent manner. The toxin exerts these effects not directly on neurons, but indirectly via astrocytes. 5. For the first time, we describe the occurrence of synaptic loss in the neocortex of patients with pneumococcal meningitis. This gives new insights into the cognitive disabilities of meningitis patients and changes our understanding of meningitis as a synaptic loss disease.

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