TY - JOUR
T1 - Dissemination of Toxoplasma gondii to immunoprivileged organs and role of Toll/interleukin-1 receptor signalling for host resistance assessed by in vivo bioluminescence imaging
AU - Hitziger, Niclas
AU - Dellacasa, Isabel
AU - Albiger, Barbara
AU - Barragan, Antonio
PY - 2005
Y1 - 2005
N2 - Toxoplasma gondii infection can lead to life-threatening systemic disease in the immunocompromised individual and in the developing fetus. Despite intensive investigation in animal models of toxoplasmosis, the processes leading to systemic dissemination remain poorly characterized. In the present study, in vivo bioluminescence imaging (BLI) was applied to the Toxoplasma mouse model to study the dynamics of infection in real time. Photon emission analyses revealed rapid dissemination of parasites in the organism and dissemination to immunoprivileged organs (brain, eyes and testes). Spatio-temporal analysis by BLI in individual mice showed that the virulent RH strain (type I) and the non-virulent ME49/PTG strain (type II) disseminate widely, but the virulent RH strain (type I) exhibits a more dramatic expansion of parasite biomass. Assessment by BLI of the Toll/interleukin-1 receptor (TIR) signalling pathway in host resistance to T. gondii revealed that signal transduction to the adaptor protein MyD88 is probably mediated by Toll-like receptor(s) rather than by IL-1R or IL-18R signalling. However, TLR1(-/-), TLR2(-/-), TLR4(-/-), TLR6(-/-) and TLR9(-/-) animals did not exhibit increased susceptibility to infection. These results suggest that intricate mechanisms regulate TIR-mediated responses during Toxoplasma infection.
AB - Toxoplasma gondii infection can lead to life-threatening systemic disease in the immunocompromised individual and in the developing fetus. Despite intensive investigation in animal models of toxoplasmosis, the processes leading to systemic dissemination remain poorly characterized. In the present study, in vivo bioluminescence imaging (BLI) was applied to the Toxoplasma mouse model to study the dynamics of infection in real time. Photon emission analyses revealed rapid dissemination of parasites in the organism and dissemination to immunoprivileged organs (brain, eyes and testes). Spatio-temporal analysis by BLI in individual mice showed that the virulent RH strain (type I) and the non-virulent ME49/PTG strain (type II) disseminate widely, but the virulent RH strain (type I) exhibits a more dramatic expansion of parasite biomass. Assessment by BLI of the Toll/interleukin-1 receptor (TIR) signalling pathway in host resistance to T. gondii revealed that signal transduction to the adaptor protein MyD88 is probably mediated by Toll-like receptor(s) rather than by IL-1R or IL-18R signalling. However, TLR1(-/-), TLR2(-/-), TLR4(-/-), TLR6(-/-) and TLR9(-/-) animals did not exhibit increased susceptibility to infection. These results suggest that intricate mechanisms regulate TIR-mediated responses during Toxoplasma infection.
U2 - 10.1111/j.1462-5822.2005.00517.x
DO - 10.1111/j.1462-5822.2005.00517.x
M3 - Article
C2 - 15888086
SN - 1462-5814
VL - 7
SP - 837
EP - 848
JO - Cellular Microbiology
JF - Cellular Microbiology
IS - 6
ER -