Legionella pneumophila-induced visual learning impairment reversed by anti-interleukin-1 beta.


Infecting mice with the opportunistic intracellular pathogen Legionella pneumophila markedly inhibited place learning of infected C57BL/6 mice as determined by the Morris water maze test. Mice infected with L. pneumophila evinced much less ability to learn the position of a hidden platform than did normal noninfected mice, which quickly learned the location of the hidden platform and escaped from the cool water of the pool with increasing efficiency. However, infected mice treated with anti-interleukin-1 (anti-IL-1) neutralizing antibody learned the task with about the same efficiency as the controls. When the animals were tested 1 week after learning, control animals remembered the task well and were able to escape with near maximal efficacy. On the other hand, L. pneumophila-infected mice performed as poorly after the 1 week rest as during the training period, indicating that infection blocked learning and not merely performance. Mice infected with L. pneumophila and given the antibody treatment were found to be indistinguishable from controls in that they remembered the task and escaped with good efficiency. Thus, the results of this study suggest that the pro-inflammatory cytokine, IL-1 beta, is involved, at least partly, in the attenuation of spatial navigational learning in mice infected acutely with a sublethal concentration of L. pneumophila. These results, therefore, suggest that cognitive impairment of L. pneumophila-infected mice may be related to the cytokine IL-1 beta and, furthermore, that cytokines may be related to learning and memory changes experienced by individuals suffering acute bacterial infections.


Citations per Year

140 Citations

Semantic Scholar estimates that this publication has 140 citations based on the available data.

See our FAQ for additional information.

Cite this paper

@article{Gibertini1995LegionellaPV, title={Legionella pneumophila-induced visual learning impairment reversed by anti-interleukin-1 beta.}, author={Maria Chiara Gibertini and Catherine A. Newton and Thomas Klein and Herman Friedman}, journal={Proceedings of the Society for Experimental Biology and Medicine. Society for Experimental Biology and Medicine}, year={1995}, volume={210 1}, pages={7-11} }