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Epstein-Barr 病毒在分化上皮细胞内的复制需要 pRb 将激活剂 E2F 转录因子隔离。

Epstein-Barr virus replication within differentiated epithelia requires pRb sequestration of activator E2F transcription factors.

机构信息

Department of Microbiology and Immunology, Louisiana State University Health Sciences Center-Shreveport, Shreveport, Louisiana, USA.

Feist-Weiller Cancer Center, Louisiana State University Health Sciences Center-Shreveport, Shreveport, Louisiana, USA.

出版信息

J Virol. 2024 Oct 22;98(10):e0099524. doi: 10.1128/jvi.00995-24. Epub 2024 Sep 18.

Abstract

Epstein-Barr virus (EBV) co-infections with human papillomavirus (HPV) have been observed in oropharyngeal squamous cell carcinoma. Modeling EBV/HPV co-infection in organotypic epithelial raft cultures revealed that HPV16 E7 inhibited EBV productive replication through the facilitated degradation of the retinoblastoma protein pRb/p105. To further understand how pRb is required for EBV productive replication, we generated CRISPR-Cas9 pRb knockout (KO) normal oral keratinocytes (NOKs) in the context of wild-type and mutant K120E p53. EBV replication was examined in organotypic rafts as a physiological correlate for epithelial differentiation. In pRb KO rafts, EBV DNA copy number was statistically decreased compared to vector controls, regardless of p53 context. Loss of pRb did not affect EBV binding or internalization of calcium-treated NOKs or early infection of rafts. Rather, the block in EBV replication correlated with impaired immediate early gene expression. An EBV infection time course in rafts with mutant p53 demonstrated that pRb-positive basal cells were initially infected with delayed replication occurring in differentiated layers. Loss of pRb showed increased S-phase progression makers and elevated activator E2F activity in raft tissues. Complementation with a panel of pRb/E2F binding mutants showed that wild type or pRb∆685 mutant capable of E2F binding reduced S-phase marker gene expression, rescued EBV DNA replication, and restored BZLF1 expression in pRb KO rafts. However, pRb KO complemented with pRb661W mutant, unable to bind E2Fs, failed to rescue EBV replication in raft culture. These findings suggest that EBV productive replication in differentiated epithelium requires pRb inhibition of activator E2Fs to restrict S-phase progression.IMPORTANCEA subset of human papillomavirus (HPV)-positive oropharyngeal squamous cell carcinoma is co-positive for Epstein-Barr virus (EBV). Potential oncogenic viral interactions revealed that HPV16 E7 inhibited productive EBV replication within the differentiated epithelium. As E7 mediates the degradation of pRb, we aimed to establish how pRb is involved in EBV replication. In the context of differentiated epithelium using organotypic raft culture, we evaluated how the loss of pRb affects EBV lytic replication to better comprehend EBV contributions to carcinogenesis. In this study, ablation of pRb interfered with EBV replication at the level of immediate early gene expression. Loss of pRb increased activator E2Fs and associated S-phase gene expression throughout the differentiated epithelium. Complementation studies showed that wild type and pRb mutant capable of binding to E2F rescued EBV replication, while pRb mutant lacking E2F binding did not. Altogether, these studies support that in differentiated tissues, HPV16 E7-mediated degradation of pRb inhibits EBV replication through unregulated E2F activity.

摘要

EBV 与 HPV 共同感染在口咽鳞状细胞癌中已有观察。在器官型上皮筏培养物中模拟 EBV/HPV 共同感染表明,HPV16 E7 通过促进 RB1 蛋白 pRb/p105 的降解来抑制 EBV 的有性复制。为了进一步了解 pRb 如何被需要用于 EBV 有性复制,我们在野生型和突变型 K120E p53 背景下生成了 CRISPR-Cas9 pRb 敲除(KO)正常口腔角质形成细胞(NOK)。作为上皮分化的生理相关性,在器官型筏中检查 EBV 复制。在 pRb KO 筏中,与载体对照相比,EBV DNA 拷贝数统计学上降低,而与 p53 无关。pRb 的缺失不影响 EBV 结合或内化钙处理的 NOK 或筏的早期感染。相反,EBV 复制的阻断与早期基因表达受损有关。在具有突变型 p53 的筏中的 EBV 感染时间过程表明,pRb 阳性基底细胞最初受到延迟复制的感染,而复制发生在分化层中。pRb 的缺失显示出更高的 S 期进展标志物和升高的激活剂 E2F 活性在筏组织中。用一组 pRb/E2F 结合突变体进行互补表明,野生型或能够结合 E2F 的 pRb∆685 突变体减少了 S 期标记基因的表达,挽救了 pRb KO 筏中的 EBV DNA 复制,并恢复了 BZLF1 的表达。然而,用不能结合 E2Fs 的 pRb661W 突变体互补的 pRb KO 未能挽救筏培养物中的 EBV 复制。这些发现表明,分化上皮中的 EBV 有性复制需要 pRb 抑制激活剂 E2Fs 来限制 S 期进展。

重要性:HPV 阳性口咽鳞状细胞癌的一部分也呈 EBV( Epstein-Barr virus )阳性。潜在的致癌病毒相互作用表明,HPV16 E7 在分化上皮中抑制了 EBV 的有性复制。由于 E7 介导 pRb 的降解,我们旨在确定 pRb 如何参与 EBV 复制。在使用器官型筏培养物的分化上皮中,我们评估了 pRb 的缺失如何影响 EBV 裂解复制,以更好地理解 EBV 对致癌作用的贡献。在这项研究中,pRb 的缺失干扰了立即早期基因表达水平的 EBV 复制。pRb 的缺失增加了整个分化上皮中的激活剂 E2F 和相关的 S 期基因表达。互补研究表明,野生型和能够结合 E2F 的 pRb 突变体挽救了 EBV 复制,而缺乏 E2F 结合的 pRb 突变体则不能。总的来说,这些研究支持在分化组织中,HPV16 E7 介导的 pRb 降解通过不受调节的 E2F 活性抑制 EBV 复制。

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