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Multiple organ dysfunction in congenital murine toxoplasmosis
Walter Stahl1, Masaki Sekiguchi, Yoshimasa Kaneda
1Department of Infectious Diseases, Tokai University School of Medicine, Isehara, Kanagawa, Japan.
The Tokai Journal of Experimental and Clinical Medicine
|October 12, 2004
Summary
Congenital toxoplasmosis in mice, caused by Toxoplasma gondii infection, leads to significant fetal loss and severe postnatal developmental issues. The study suggests microvascular dysfunction, not direct parasite damage, drives the severe pathology.
Area of Science:
- Immunology
- Pathology
- Parasitology
Background:
- Congenital toxoplasmosis poses a significant threat to fetal development.
- Toxoplasma gondii infection during pregnancy can lead to severe maternal and fetal complications.
- Understanding the pathogenesis of congenital toxoplasmosis is crucial for developing effective interventions.
Purpose of the Study:
- To investigate the effects of Toxoplasma gondii infection on pregnant mice and their offspring.
- To characterize the pathological outcomes of congenital toxoplasmosis in different mouse strains.
- To elucidate the underlying mechanisms of disease progression in congenital toxoplasmosis.
Main Methods:
- Gravid mice of NYLAR, C57BL/6J, and BALB/c strains were infected with Toxoplasma gondii on gestation day 7.
- Fetal wastage, pup survival rates, and postnatal development were monitored.
- Necropsy, brain press-smears, and histologic examination of multiple organs were performed to assess pathology.
Main Results:
- Infection resulted in significant fetal resorptions, abortions, and stillbirths, with fetal wastage rates ranging from 35% to 55%.
- Surviving pups exhibited cachexia, growth retardation, hind limb weakness, and petechial lesions.
- Histologic examination revealed widespread organ damage, including CNS lesions, severe liver and spleen pathology, and kidney necrosis.
Conclusions:
- Congenital toxoplasmosis in mice leads to high rates of fetal loss and severe postnatal morbidity.
- The pathogenesis appears to be driven by microvascular dysfunction, including dysregulated hemostasis and perfusion failure, leading to multiple organ dysfunction.
- Toxoplasmic sepsis, resulting from parasite dissemination and endothelial invasion, is implicated in the observed microvascular dysfunction.