School of Veterinary Medicine and Biomedical Sciences, Nebraska Center for Virology, University of Nebraska, Lincoln, NE 68583-0900, USA.
Virus Res. 2013 Aug;175(2):101-9. doi: 10.1016/j.virusres.2013.04.005. Epub 2013 May 3.
The herpes simplex virus type 1 (HSV-1) latency-associated transcript (LAT) is abundantly expressed in latently infected trigeminal ganglionic sensory neurons. Expression of the first 1.5 kb of LAT coding sequences restores wild type reactivation to a LAT null HSV-1 mutant. The anti-apoptosis functions of the first 1.5 kb of LAT coding sequences are important for wild type levels of reactivation from latency. Two small non-coding RNAs (sncRNAs) contained within the first 1.5 kb of LAT coding sequences are expressed in trigeminal ganglia of latently infected mice, they cooperate to inhibit apoptosis, and reduce the efficiency of productive infection. In this study, we demonstrated that LAT sncRNA1 cooperates with the RNA sensor, retinoic acid inducible gene I (RIG-I), to stimulate IFN-β promoter activity and NF-κB dependent transcription in human or mouse cells. LAT sncRNA2 stimulated RIG-I induction of NF-κB dependent transcription in mouse neuroblastoma cells (Neuro-2A) but not human 293 cells. Since it is well established that NF-κB interferes with apoptosis, we tested whether the sncRNAs cooperated with RIG-I to inhibit apoptosis. In Neuro-2A cells, both sncRNAs cooperated with RIG-I to inhibit cold-shock induced apoptosis. Double stranded RNA (PolyI:C) stimulates RIG-I dependent signaling; but enhanced cold-shock induced apoptosis. PolyI:C, but not LAT sncRNAs, interfered with protein synthesis when cotransfected with RIG-I, which correlated with increased levels of cold-shock induced apoptosis. LAT sncRNA1 appeared to interact with RIG-I in transiently transfected cells suggesting this interaction stimulates RIG-I.
单纯疱疹病毒 1 型(HSV-1)潜伏相关转录物(LAT)在潜伏感染的三叉神经节感觉神经元中大量表达。表达 LAT 编码序列的前 1.5kb 可恢复 LAT 缺失的 HSV-1 突变体的野生型再激活。LAT 编码序列前 1.5kb 的抗细胞凋亡功能对于从潜伏状态恢复野生型水平的再激活很重要。LAT 编码序列前 1.5kb 内包含的两个小非编码 RNA(sncRNA)在潜伏感染的小鼠三叉神经节中表达,它们合作抑制细胞凋亡,并降低生产性感染的效率。在这项研究中,我们证明 LAT sncRNA1 与 RNA 传感器,视黄酸诱导基因 I(RIG-I)合作,刺激 IFN-β 启动子活性和 NF-κB 依赖性转录在人或鼠细胞中。LAT sncRNA2 刺激 RIG-I 诱导 NF-κB 依赖性转录在小鼠神经母细胞瘤细胞(Neuro-2A)中,但不在人 293 细胞中。由于 NF-κB 干扰细胞凋亡已得到充分证实,我们测试了 sncRNA 是否与 RIG-I 合作抑制细胞凋亡。在 Neuro-2A 细胞中,两个 sncRNA 与 RIG-I 合作抑制冷休克诱导的细胞凋亡。双链 RNA(PolyI:C)刺激 RIG-I 依赖性信号;但增强冷休克诱导的细胞凋亡。PolyI:C,但不是 LAT sncRNA,在与 RIG-I 共转染时干扰蛋白质合成,这与冷休克诱导的细胞凋亡增加有关。LAT sncRNA1 似乎在瞬时转染细胞中与 RIG-I 相互作用,表明这种相互作用刺激了 RIG-I。