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首页> 外文期刊>Journal of bacteriology >Coordinate Intracellular Expression ofSalmonella Genes Induced during Infection
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Coordinate Intracellular Expression ofSalmonella Genes Induced during Infection

机译:感染过程中诱导沙门氏菌基因的细胞内协调表达。

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Salmonella typhimurium in vivo-induced (ivi) genes were grouped by their coordinate behavior in response to a wide variety of environmental and genetic signals, including pH, Mg2+, Fe2+, and PhoPQ. All of the seven ivi fusions that are induced by both low pH and low Mg2+ (e.g., iviVI-A) are activated by the PhoPQ regulatory system. Iron-responsive ivi fusions include those induced under iron limitation (e.g., entF) as well as one induced by iron excess but only in the absence of PhoP (pdu). Intracellular expression studies showed that each of the pH- and Mg2+-responsive fusions is induced upon entry into and growth within three distinct mammalian cell lines: RAW 264.7 murine macrophages and two cultured human epithelial cell lines: HEp-2 and Henle-407. Each ivi fusion has a characteristic level of induction consistent within all three cell types, suggesting that this class of coordinately expressed ivi genes responds to general intracellular signals that are present both in initial and in progressive stages of infection and may reflect their responses to similar vacuolar microenvironments in these cell types. Investigation of ivi expression patterns reveals not only the inherent versatility of pathogens to express a given gene(s) at various host sites but also the ability to modify their expression within the context of different animal hosts, tissues, cell types, or subcellular compartments.
机译:沙门氏菌鼠伤寒沙门氏菌体内诱导的( ivi )基因按其对多种环境和遗传信号(包括pH,Mg 2)的协调行为进行分组+ ,Fe 2 + 和PhoPQ。低pH值和低Mg 2 + (例如, iviVI-A )诱导的所有七个 ivi 融合体均被激活。 PhoPQ监管系统。铁反应性 ivi 融合物包括在铁限制条件下诱导的融合(例如 entF )以及铁过量诱导但仅在PhoP不存在的情况下融合的融合子( pdu )。细胞内表达研究表明,每种pH-和Mg 2 + 响应性融合物在进入三种不同的哺乳动物细胞系并在其中生长时均被诱导:RAW 264.7鼠巨噬细胞和两种培养的人上皮细胞系: HEp-2和Henle-407。每种 ivi 融合体在所有三种细胞类型中均具有一致的特征诱导水平,这表明此类协调表达的 ivi 基因对初始时均存在的一般细胞内信号有反应在感染的进展阶段,可能反映了它们对这些细胞类型中类似液泡微环境的反应。对 ivi 表达模式的研究不仅揭示了病原体固有的多功能性,可以在各种宿主位点表达给定的基因,而且还可以在不同动物宿主,组织,细胞类型或亚细胞区室。

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