A major role for capsule-independent phagocytosis-inhibitory mechanisms in mammalian infection by Cryptococcus neoformans.

A major role for capsule-independent phagocytosis-inhibitory mechanisms in mammalian infection by Cryptococcus neoformans.
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荚膜独立的吞噬抑制机制在哺乳动物新生隐球菌感染中的主要作用。

DOI:
10.1016/j.chom.2011.02.003
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发表时间:
2011-03-17
影响因子:
30.3
通讯作者:
Madhani HD
Madhani HD
中科院分区:
医学1区
文献类型:
--
作者:
Chun CD;Brown JCS;Madhani HD

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人类真菌病原体新型隐球菌的抗吞噬多糖荚膜是主要的毒力属性。然而,先前对多效毒力决定子 Gat201(一种 GATA 家族转录因子)的研究表明,存在不依赖于荚膜的抗吞噬机制。我们已确定 Gat201 控制约 1100 个基因(基因组的 16%)的 mRNA 水平,并结合约 130 个基因的上游区域。七个与 Gat201 结合的基因编码假定的和已知的转录因子(其中两个先前与毒力有关),表明存在广泛的调控网络。系统分析确定了两个关键的 Gat201 结合基因:GAT204(一种转录因子)和 BLP1,它们在很大程度上解释了 Gat201 的荚膜独立抗吞噬功能。观察到单突变体和双突变体对体外吞噬作用和体内宿主定植的定量影响之间存在很强的相关性。这种基因解剖提供了证据,表明不依赖荚膜的抗吞噬机制对于新型隐球菌成功感染哺乳动物至关重要。
The anti-phagocytic polysaccharide capsule of the human fungal pathogen Cryptococcus neoformans is a major virulence attribute. However, previous studies of the pleiotropic virulence determinant Gat201, a GATA-family transcription factor, suggested that capsule-independent antiphagocytic mechanisms exist. We have determined that Gat201 controls the mRNA levels of ~1100 genes (16% of the genome) and binds the upstream regions of ~130 genes. Seven Gat201-bound genes encode for putative and known transcription factors—including two previously implicated in virulence—suggesting an extensive regulatory network. Systematic analysis pinpointed two critical Gat201-bound genes, GAT204 (a transcription factor) and BLP1, which account for much of the capsule-independent antiphagocytic function of Gat201. A strong correlation was observed between the quantitative effects of single and double mutants on phagocytosis in vitro and on host colonization in vivo. This genetic dissection provides evidence that capsule-independent anti-phagocytic mechanisms are pivotal for successful mammalian infection by C. neoformans.
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