Journal
VACCINE
Volume 28, Issue 3, Pages 737-743Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.vaccine.2009.10.065
Keywords
UV-attenuated T gondii; Astragalus membranaceus; Scutellaria baicalensis; Mice
Categories
Funding
- National Basic Research Program of China [2010CB530001]
- Guangdong Provincial Natural Science Foundation of China [06021302]
- National Special Research Program [200803017]
- Program for Changjiang Scholars and innovative Research Team in University [IRT0723]
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Human vaccines are not available and current anti-toxoplasma treatment is disappointing. To investigate the possible adjuvant effect of aqueous extracts obtained from medicinal herbs of Astragalus membranaceus (Am) and Scutellaria baicalensis GEORGI (Sb) on the immune response to Toxoplasma gondii in the mouse models induced by ultraviolet (UV)-attenuated T gondii, this paper studies the possible vaccination strategies to help combat infections with Toxoplasma and looking towards developing new vaccine and approaches. We used UV-attenuated T. gondii (UV-T.g) of RH strain as a vaccine and the extracts of Am (AmE) and Sb (SbE) as adjuvant. Mice were infected by intraperitoneal (i p) injection of 101 RH tachyzoites alone(infected controls), infected and treated with AmE(T.g+AmE) and SbE (T.g+SbE). respectively, and mice immunized i p. with UV-T.g alone. UV-Tg co-administrated with AmE (UV-Tg + AmE) or SbE (UV-T.g+SbE), and then challenged with Tg, respectively The animal survival time, parasite burden in peritoneal lavage fluids, liver histopathological analysis, and levels of serum antibodies among the groups were compared after either infection or challenge. The results showed that, compared to infected controls, infected mice treated with AmE or SbE, or vaccinated mice and then challenged, had significantly prolonged survival time, decreased parasite burden, improved liver histopathological score. and increased Th1-type cellular immune response; furthermore, vaccinated mice co-administrated with AmE or SbE had even longer survival. lower parasite burden, lower liver histopathological score, and higher Till response after challenge. Our data demonstrated that the protective immunity of UV-attenuated T. gondii could be markedly enhanced by AmE or SbE co-administration, which suggests that both AmE and SbE may have the potential to be used as effective vaccine adjuvant (C) 2009 Elsevier Ltd. All rights reserved.
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