Conserved protective mechanisms in radiation and genetically attenuated uis3(-) and uis4(-) Plasmodium sporozoites.

Conserved protective mechanisms in radiation and genetically attenuated uis3(-) and uis4(-) Plasmodium sporozoites.
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DOI:
10.1371/journal.pone.0004480
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发表时间:
2009
期刊:
影响因子:
3.7
通讯作者:
Nussenzweig, Victor
Nussenzweig, Victor
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Kumar, Kota Arun;Baxter, Peter;Tarun, Alice S.;Kappe, Stefan H. I.;Nussenzweig, Victor

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用放射减毒疟原虫子孢子(RAS)免疫在小鼠模型和人类中增强针对子孢子攻击的无菌保护性免疫。与RAS相似,命名为uis 3(-)、uis 4(-)和P36 p(-)的遗传减毒子孢子(GAP)在肝脏发育阶段具有抑制生长的作用,并在小鼠中产生强大的保护性免疫应答。我们比较了约氏疟原虫RAS、uis 3(-)和uis 4(-)在BALB/c小鼠中的保护机制。在RAS和GAP中,只有在一次或多次加强注射后才能实现无菌免疫。对RAS和GAP产生的环子孢子蛋白(CSP)的免疫应答没有差异。为了评估非CSP T细胞抗原的作用,我们用约氏疟原虫RAS或用uis 3(-)或uis 4(-)GAP免疫了抗体缺陷的CSP转基因BALB/c小鼠,所述小鼠对CSP具有T细胞耐受性,并用野生型子孢子攻击它们。在每种情况下,与单独的抗体缺陷小鼠相比,抗体缺陷CSP转基因小鼠中的寄生虫肝脏阶段负荷高约3个对数。我们得出结论,CSP在RAS和GAP中都是一种强大的保护性抗原,UIS 3(-)和UIS 4(-),并且保护机制是相似的,与子孢子减毒方法无关。
Immunization with radiation attenuated Plasmodium sporozoites (RAS) elicits sterile protective immunity against sporozoite challenge in murine models and in humans. Similarly to RAS, the genetically attenuated sporozoites (GAPs) named uis3(-), uis4(-) and P36p(-) have arrested growth during the liver stage development, and generate a powerful protective immune response in mice. We compared the protective mechanisms in P. yoelii RAS, uis3(-) and uis4(-) in BALB/c mice. In RAS and GAPs, sterile immunity is only achieved after one or more booster injections. There were no differences in the immune responses to the circumsporozoite protein (CSP) generated by RAS and GAPs. To evaluate the role of non-CSP T-cell antigens we immunized antibody deficient, CSP-transgenic BALB/c mice, that are T cell tolerant to CSP, with P. yoelii RAS or with uis3(-) or uis4(-) GAPs, and challenged them with wild type sporozoites. In every instance the parasite liver stage burden was approximately 3 logs higher in antibody deficient CSP transgenic mice as compared to antibody deficient mice alone. We conclude that CSP is a powerful protective antigen in both RAS and GAPs viz., uis3(-) and uis4(-) and that the protective mechanisms are similar independently of the method of sporozoite attenuation.
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