Contributions of MyD88-dependent receptors and CD11c-positive cells to corneal epithelial barrier function against Pseudomonas aeruginosa.

Contributions of MyD88-dependent receptors and CD11c-positive cells to corneal epithelial barrier function against Pseudomonas aeruginosa.
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DOI:
10.1038/s41598-017-14243-w
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发表时间:
2017-10-23
期刊:
影响因子:
4.6
通讯作者:
Fleiszig SMJ
Fleiszig SMJ
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Metruccio MME;Tam C;Evans DJ;Xie AL;Stern ME;Fleiszig SMJ

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以前我们报道过角膜上皮屏障对铜绿假单胞菌的功能是MyD 88依赖的。在这里,我们探索了MyD 88依赖性受体的贡献,使用重要的小鼠眼睛和共聚焦成像。未受损伤的IL-1 R(−/−)或TLR 4(−/−)角膜,而不是TLR 2(−/−),TLR 5(−/−),TLR 7(−/−)或TLR 9(−/−),比野生型更容易受到铜绿假单胞菌粘附(分别为3.8倍,3.6倍)。只有当角膜表面受到损伤时,粘附在IL-1 R(−/−)或TLR 5(−/−)小鼠角膜上的细菌才能穿透上皮表面。骨髓嵌合体表明,骨髓来源的细胞有助于IL-1 R依赖的屏障功能。即使在角膜未受伤的情况下,即使在体内(而非离体),基质CD 11 c+细胞也会对细菌挑战做出反应。这些细胞向上皮表面延伸突起,并与表面损伤的角膜中的粘附细菌共定位。虽然CD 11 c+细胞耗竭降低了IL-6、IL-1β、CXCL 1、CXCL 2和CXCL 10对细菌的转录应答,并增加了对细菌粘附的易感性(>3倍),但上皮仍对细菌渗透具有抗性。IL-1 R(−/−)角膜在有和没有细菌攻击的情况下也显示出IL-6和CXCL 1基因的下调。这些数据显示了TLR 4、TLR 5、IL-1 R和CD 11 c+细胞在对抗铜绿假单胞菌的组成性上皮屏障功能中的复杂作用,其细节取决于体内条件。
Previously we reported that corneal epithelial barrier function against Pseudomonas aeruginosa was MyD88-dependent. Here, we explored contributions of MyD88-dependent receptors using vital mouse eyes and confocal imaging. Uninjured IL-1R (−/−) or TLR4 (−/−) corneas, but not TLR2 (−/−), TLR5 (−/−), TLR7 (−/−), or TLR9 (−/−), were more susceptible to P. aeruginosa adhesion than wild-type (3.8-fold, 3.6-fold respectively). Bacteria adherent to the corneas of IL-1R (−/−) or TLR5 (−/−) mice penetrated beyond the epithelial surface only if the cornea was superficially-injured. Bone marrow chimeras showed that bone marrow-derived cells contributed to IL-1R-dependent barrier function. In vivo, but not ex vivo, stromal CD11c+ cells responded to bacterial challenge even when corneas were uninjured. These cells extended processes toward the epithelial surface, and co-localized with adherent bacteria in superficially-injured corneas. While CD11c+ cell depletion reduced IL-6, IL-1β, CXCL1, CXCL2 and CXCL10 transcriptional responses to bacteria, and increased susceptibility to bacterial adhesion (>3-fold), the epithelium remained resistant to bacterial penetration. IL-1R (−/−) corneas also showed down-regulation of IL-6 and CXCL1 genes with and without bacterial challenge. These data show complex roles for TLR4, TLR5, IL-1R and CD11c+ cells in constitutive epithelial barrier function against P. aeruginosa, with details dependent upon in vivo conditions.
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