RESULTS: Our findings showed that in vivo model of C. neoformans infection demonstrated induction of abundant IL-17A secretion. By examining the lung bronchoalveolar lavage fluid (BALF), mediastinal lymph node (mLN) and spleen of the IL-17A-EGFP reporter mice, we showed that intranasal inoculation with C. neoformans promoted leukocytes lung infiltration. A large proportion (~ 50%) of the infiltrated CD4+ helper T cell population secreted EGFP, indicating vigorous TH17 activity in the C. neoformans-infected lung. The infection study in IL-17A-KO mice, on the other hand, revealed that absence of IL-17A marginally boosted fungal burden in the lung and accelerated the mouse death.
CONCLUSION: Therefore, our data suggest that IL-17A is released predominantly from TH17 cells in vivo, which plays a supporting role in the protective immunity against C. neoformans infection.
Methods: LMs were obtained and incubated with mature BMDCs. The internalization of LMs by BMDCs was studied by confocal microscopy, and the LMs immune-stimulatory capacity was determined by the expression of surface molecules (CD86 and MHCII) and the cytokine production (interleukin [IL]-12, interferon-Υ, tumor necrosis factor-α, and IL-10) 24 h after exposure to LMs.
Results: The interaction of LMs with BMDCs and its internalization was demonstrated as well as the immune activation of BMDCs, characterized by the increased expression of CD86 and the production of IL-12. The LMs internalization and immune activation of BMDCs were blocked in the presence of cytochalasin, filipin III and chlorpromazine, which demonstrated that internalization of LMs by BMDCs is a key process for the LMs induced immune activation of BMDCs.
Conclusions: The results obtained support the further evaluation of LMs as a mycobacterial vaccine, adjuvant, and in immunotherapy.
METHODS: per-orally infected C57BL/6 mice with 15-20 cysts of the avirulent T. gondii Beverly strain at 9-11 weeks of age were examined 12 weeks later during parasite establishment. Distributions of the parasite's cysts and the histopathological lesions in the brains were analyzed using Image J software. Relative expression of TNF-α and iNOS of cell-mediated immunity (CMI), Bax (pro-apoptosis) and Bcl-2 (anti-apoptosis) were all assessed using immunohistochemistry.
RESULTS: higher parasite burden was seen in the forebrain with p value <= 0.05. Dramatically increased TNF-α, iNOS, and Bax expressions with Bax/Bcl-2 ratio 2.42:0.52 were reported (p value <= 0.05). The significant correlation between Bax data and different CMI biomarkers including TNF-α and i-NOS was evaluated. Interestingly, no significant correlation was seen between TNF-α, iNOS, Bax and Bcl-2 expressions and location of the parasite. However, Bax/Bcl-2 ratio was statistically correlated with CMI biomarkers and whole sample mean parasite burden, p value <= 0.05.
CONCLUSION: Chronic toxoplasmosis exhibits an immense pro-apoptotic signal on the cerebral tissues of experimental mice.