TgMAPK1 is a Toxoplasma gondii MAP kinase that hijacks host MKK3 signals to regulate virulence and interferon-γ-mediated nitric oxide production.

TgMAPK1 is a Toxoplasma gondii MAP kinase that hijacks host MKK3 signals to regulate virulence and interferon-γ-mediated nitric oxide production.
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DOI:
10.1016/j.exppara.2013.03.016
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发表时间:
2013-07
影响因子:
2.1
通讯作者:
Curiel, Tyler J.
Curiel, Tyler J.
中科院分区:
医学4区
文献类型:
--
作者:
Brumlik, Michael J.;Pandeswara, Srilakshmi;Ludwig, Sara M.;Jeansonne, Duane P.;Lacey, Michelle R.;Murthy, Kruthi;Daniel, Benjamin J.;Wang, Rong-Fu;Thibodeaux, Suzanne R.;Church, Kristina M.;Hurez, Vincent;Kious, Mark J.;Zhang, Bin;Alagbala, Adebusola;Xia, Xiaojun;Curiel, Tyler J.

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寄生虫弓形虫控制组织特异性一氧化氮(NO),从而通过不清楚的机制增强毒力和免疫病理学。我们现在确定TgMAPK 1,一种弓形虫丝裂原活化蛋白激酶(MAPK),作为一种毒力因子,通过操纵宿主干扰素(IFN)-γ介导的诱导型一氧化氮合酶(iNOS)来调节组织特异性寄生虫负荷。TgMAPK 1表达降低的弓形虫(TgMAPK 1 lo)表明,TgMAPK 1促进IFN-γ驱动的p38 MAPK活化,以MKK 3依赖性方式减少IFN-γ产生的NO,减弱IFN-γ介导的寄生虫控制。野生型小鼠中的TgMAPK 1 lo感染产生的寄生虫负荷比具有正常TgMAPK 1表达的对照寄生虫(TgMAPK 1con)低≥ 10倍。减少的寄生虫负荷在IFN-γ KO小鼠中持续存在,但在来自iNOS KO小鼠的正常iNOS充满的器官中均衡。与其他寄生虫激酶相比,寄生虫MAPK的研究要少得多,但作为免疫治疗和药物发现的靶点值得额外关注。
The parasite Toxoplasma gondii controls tissue-specific nitric oxide (NO), thereby augmenting virulence and immunopathology through poorly-understood mechanisms. We now identify TgMAPK1, a Toxoplasma mitogen-activated protein kinase (MAPK), as a virulence factor regulating tissue-specific parasite burden by manipulating host interferon (IFN)-γ-mediated inducible nitric oxide synthase (iNOS). Toxoplasma with reduced TgMAPK1 expression (TgMAPK1lo) demonstrated that TgMAPK1 facilitates IFN-γ-driven p38 MAPK activation, reducing IFN-γ-generated NO in an MKK3-dependent manner, blunting IFN-γ-mediated parasite control. TgMAPK1lo infection in wild type mice produced ≥ten-fold lower parasite burden versus control parasites with normal TgMAPK1 expression (TgMAPK1con). Reduced parasite burdens persisted in IFN-γ KO mice, but equalized in normally iNOS-replete organs from iNOS KO mice. Parasite MAPKs are far less studied than other parasite kinases, but deserve additional attention as targets for immunotherapy and drug discovery.
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