Schistosome eggs have a direct role in the induction of basophils capable of a high level of IL-4 production : Comparative study of single- and bisexual infection of Schistosoma mansoni in vivo

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概要

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• Immunobiological roles of schistosome eggs during murine experimental infection were investigated with special reference to the induction of basophilic leukocytes. After single- or bisexual infection with Schistosoma mansoni in BALB⁄c mice, splenomegaly and liver granulomas were observed only in bisexual infection in parallel with deposition of mature parasite eggs. Comparison of the kinetics of basophil response revealed a marked increase in number in the bone marrow of mice with bisexual infection at the 7th week post infection as opposed to a marginal increase in single- sex infections. In the spleen, bimodal response was observed in the basophil responses; a small but repeatable peak at the 4th week after infection, increasing again at the 8th week, which corresponded to the initiation and maturation of parasite eggs in the affected organs of infected mice. The same time course was observed for IL-4 production by the splenocytes from mice of bisexual infection. To obtain more concrete evidence of the role of eggs in the induction of basophils, we tested using the intravenous egg injection model. Injection of eggs induced basophilia, and it was accompanied by the up-regulation of IL-4 production in splenocytes from the 8th day. Basophils induced in this model showed a high level of IL-4 production confirmed by flow cytometry, while faint levels of IL-4 production were observed for CD4+ T cells at this time point. In addition, we demonstrate that egg deposition is the trigger of basophil induction and activation in the murine experimental model of S. mansoni infection, which might play an essential role in the initiation of Th1⁄2 conversion during the course of S. mansoni infection in vivo.

• 2010-03-01

著者

• OHTA Nobuo

  Department of Otolaryngology, Yamagata University School of Medicine

• ANYAN William

  Department of Environmental Parasitology Tokyo Medical and Dental University Graduate School of Medi

• KUMAGAI Takashi

  Department of Environmental Parasitology Tokyo Medical and Dental University Graduate School of Medi

• SHIMOGAWARA Rieko

  Department of Environmental Parasitology Tokyo Medical and Dental University Graduate School of Medi

• SEKI Takenori

  Department of Environmental Parasitology Tokyo Medical and Dental University Graduate School of Medi

• AKAO Nobuaki

  Department of Environmental Parasitology Tokyo Medical and Dental University Graduate School of Medi

• OBATA Kazushige

  Department of Immune Regulation Tokyo Medical and Dental University

• KWANSA-BENTUM Bethel

  Department of Environmental Parasitology Tokyo Medical and Dental University Graduate School of Medi

• BOSOMPEM Kwabena

  Department of Parasitology, Noguchi Memorial Institute for Medical Research, University of Ghana

• BOAKYE Daniel

  Department of Parasitology, Noguchi Memorial Institute for Medical Research, University of Ghana

• WILSON Michael

  Department of Parasitology, Noguchi Memorial Institute for Medical Research, University of Ghana

• KARASUYAMA Hajime

  Department of Immune Regulation Tokyo Medical and Dental University

• Ohta Nobuo

  Department Of Environmental Parasitology Tokyo Medical And Dental University Graduate School Of Medi

• Boakye Daniel

  Department Of Parasitology Noguchi Memorial Institute For Medical Research University Of Ghana

• Karasuyama Hajime

  Department Of Immune Regulation Graduate School Tokyo Medical And Dental University

• Bosompem Kwabena

  Department Of Parasitology Noguchi Memorial Institute For Medical Research University Of Ghana

• Wilson Michael

  Department Of Parasitology Noguchi Memorial Institute For Medical Research University Of Ghana

• Wilson Michael

  Department Of Ecology Evolution And Behavior University Of Minnesota

• Ohta Nobuo

  Department Of Ent School Of Medicine Yamagata University

• Kumagai Takashi

  Department Of Communications And Computer Engineering Graduate School Of Informatics Kyoto Universit

• Wilson Michael

  Department Of Cardiothoracic Surgery Royal Prince Alfred Hospital The University Of Sydney

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