Sexually transmitted infections are a critical public health issue. However, the mechanisms underlying sexually transmitted infections in women and the link between the infection mechanism and the wide range of clinical outcomes remain elusive due to a lack of research models mimicking human infection in vivo. We established a human cervical tissue explant model to mimic local Neisseria gonorrhoeae (GC) infections. We found that GC preferentially colonize the ectocervix by activating integrin-β1, which inhibits epithelial shedding. GC selectively penetrate into the squamocolumnar junction (TZ) and endocervical epithelia by inducing β-catenin phosphorylation, which leads to E-cadherin junction disassembly. Epithelial cells in various cervical regions differentially express carcinoembryonic antigen-related cell adhesion molecules (CEACAMs), the host receptor for GC opacity-associated proteins (OpaCEA). Relatively high levels were detected on the luminal membrane of ecto/endocervical epithelial cells but very low levels intracellularly in TZ epithelial cells. CEACAM-OpaCEA interaction increased ecto/endocervical colonization and reduced endocervical penetration by increasing integrin-β1 activation and inhibiting β-catenin phosphorylation respectively, through CEACAM downstream signaling. Thus, the intrinsic properties of cervical epithelial cells and phase-variation of bacterial surface molecules both play a role in controlling GC infection mechanisms and infectivity, preferential colonization or penetration, potentially leading to asymptomatic or symptomatic infection.

译文

性传播感染是一个至关重要的公共卫生问题。然而,由于缺乏模仿体内人类感染的研究模型,女性性传播感染的潜在机制以及感染机制与广泛的临床结果之间的联系仍然难以捉摸。我们建立了人类宫颈组织外植体模型,以模拟局部淋病奈瑟菌 (GC) 感染。我们发现,GC通过激活整合素-β1 (抑制上皮脱落) 优先定植外宫颈。GC通过诱导 β-catenin磷酸化选择性渗透到鳞状结肠交界处 (TZ) 和宫颈内膜上皮,从而导致E-cadherin交界处的拆卸。不同宫颈区域的上皮细胞差异表达癌胚抗原相关细胞粘附分子 (CEACAMs),这是GC不透明相关蛋白 (OpaCEA) 的宿主受体。在胞外/宫颈上皮细胞的腔膜上检测到相对较高的水平,但在TZ上皮细胞内检测到的水平非常低。CEACAM-OpaCEA相互作用通过CEACAM下游信号传导分别增加整联蛋白-β1活化和抑制 β-catenin磷酸化,从而增加了胞外/胞内定植并减少了胞内渗透。因此,宫颈上皮细胞的固有特性和细菌表面分子的相变都在控制GC感染机制和感染性,优先定植或渗透方面发挥作用,可能导致无症状或症状感染。

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