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Erschienen in: Virology Journal 1/2020

Open Access 01.12.2020 | Research

Novel transcription regulatory sequences and factors of the immune evasion protein ICP47 (US12) of herpes simplex viruses

verfasst von: Jun-Ting Cheng, Ying-Ying Wang, Lin-Zhong Zhu, Ying Zhang, Wen-Qi Cai, Zi-Wen Han, Yang Zhou, Xian-Wang Wang, Xiao-Chun Peng, Ying Xiang, Hui-Yu Yang, Shu-Zhong Cui, Zhaowu Ma, Bing-Rong Liu, Hong-Wu Xin

Erschienen in: Virology Journal | Ausgabe 1/2020

Abstract

Background

Herpes simplex virus (HSV) can cause encephalitis. Its infected cell polypeptide 47 (ICP47), encoded by immediate-early gene US12, promotes immune escape. ICP47 was modified in the clinically approved oncolytic HSV (oHSV) T-Vec. However, transcription regulatory sequence (TRS) and transcription regulatory factor (TRF) of HSV US12 are seldom reported.

Methods

Previously, our laboratory isolated a new HSV strain named HSV-1-LXMW from a male patient with oral herpes in Beijing, China. Firstly, the genetic tree was used to analyze its genetic relationship. The US12 TRS and TRF in HSV-1-LXMW were found by using predictive software. Secondly, the further verification by the multi-sequence comparative analysis shown that the upstream DNA sequence of HSV US12 gene contained the conserved region. Finally, the results of literature search shown that the expression of transcription factors was related to the tissue affinity of HSV-1 and HSV-2, so as to increase the new understanding of the transcriptional regulation of HSV biology and oncolytic virus (OVs) therapy.

Results

Here we reported the transcriptional regulation region sequence of our new HSV-1-LXMW, and its close relationship with HSV-1-CR38 and HSV-1-17. Importantly we identified eight different kinds of novel TRSs and TRFs of HSV US12 for the first time, and found they are conserved among HSV-1 (c-Rel, Elk-1, Pax-4), HSV-2 (Oct-1, CF2-II, E74A, StuAp) or both HSVs (HNF-4). The TRFs c-Rel and Oct-1 are biologically functional respectively in immune escape and viral replication during HSV infection.

Conclusions

Our findings have important implication to HSV biology, infection, immunity and oHSVs.
Hinweise
Jun-Ting Cheng, Ying-Ying Wang and Lin-Zhong Zhu contributed equally to this work.

Supplementary information

Supplementary information accompanies this paper at https://​doi.​org/​10.​1186/​s12985-020-01365-3.

Publisher’s Note

Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
Abkürzungen
HSV
Herpes simplex virus
ICP47
Infected cell polypeptide 47
oHSV
oncolytic HSV
TRSs
Transcription regulatory sequences
TRFs
Transcription regulatory factors
OVs
Oncolytic viruses
TK
Thymidine kinase
MHC-I
Major histocompatibility complex I
TAP
Transporter associated with antigen processing
NBDs
Nucleotide binding domains
ER
Endoplasmic reticulum
CTLs
Cytotoxic T lymphocytes
NF-κB
Nuclear factor κB
HNF-4
Hepatocyte nuclear factor 4
CF2-II
C(2)-H(2)-type zinc-finger transcription factor II
T-VEC
Talimogene laherparepvec

Background

Tumors are heterogeneous and often resistant to chemotherapy and radiotherapy [1, 2], and no single treatment could be widespread applied or has full effectivity for cancer treatment [36]. OVs treatment are different from conventional chemotherapy and radiotherapy, and could provide additional treatment strategies [7]. Additionally, OVs are diverse in structure and biology, which spread among tumors with different kinetics and kill tumor cells through multiple mechanisms [8]. The oHSV T-VEC has been approved by FDA for patients with melanoma [911]. HSV, a member of the alpha-herpesviruses subfamily, which is an encapsulated DNA virus, offers particular benefits for use as a gene transfer vector, contains at least 120 kb of double-stranded DNA genome, encoding more than 70 genes [7, 12]. Type 1 and 2 HSVs (HSV-1 and HSV-2) are the most common and acute human pathogens. HSV-1 is normally related to oral-facial infections and may cause encephalitis in severe cases, while HSV-2 mostly induces genital infections and could cause mother-to-child transmission [13, 14].
HSV as an OVs has many favourable properties. Engineered oHSVs have been shown to be remarkably safe in clinical trials, and also have some evidence of their effectiveness [12]. Dlsptk, the first recombinant HSV, was generated by deleting the gene UL23 encoding thymidine kinase (TK) [15]. The selectivity and efficacy of dlsptk established a principled proof for the application of HSV-1 genome deletions to carry out the tumor selectivity. However, from the standpoint of clinical application, the UL23 deletion was eventually problematic for it causes dlsptk impervious to first-line anti-herpes pharmaceuticals, resulting in abandance of dlsptk. The second recombinant HSV, G207, is the first oHSV tested in clinical trials and it deletes the genes UL39 (ICP6) and RL1 (ICP34.5). As is well-known, ICP34.5, a key factor of HSV neurovirulence, can preclude the shut-off of protein synthesis in infected host cells. ICP6 is a determinant viral enzyme for HSV DNA synthesis, which is indispensable for virus replication in normal non-dividing cells [16]. Dlsptk and G207 are designed to weaken viral replication and reduce viral virulence in non-cancer cells. The third generation oHSV-1 vector, G47Δ, is based on G207 with additional ICP47 deletion, which surprisingly enhances viral replication and increases immune recognition of infected cells [17]. ICP47 deletion contains the promoter region of US11 and also attenuates γ34.5 growth [18]. Importantly, because of ICP47 can block peptide loading of major histocompatibility complex I (MHC-I) molecules, G47∆ has induced an antitumor immune response for the ICP47 deletion. Therefore, increasing MHC I antigen presentation, stimulating cytotoxic lymphocytes and reducing NK cytolysis of infected cells can enhance anti-tumor immune response. Anti-tumor immune responses may be the key for the treatment of tumor metastasis .
ICP47, encoded by gene US12, is a polymorphous protein and could block RNA splicing in early infection, and then, shuttle viral mRNA from nucleus to cytoplasm in late infection [19]. ICP47 directly binds antigen-dependent transporter (TAP), limiting antigen trafficing, leading to the occurrence of empty MHC-I [20]. The functional domain of ICP47 has been mapped to 35 residues at the N-terminal, forming an extended helix-loop-helix structure in the lipid bilayer [20]. In addition, since ICP47 is too large to be easily transported by TAP, its high affinity binding traps TAP in an inactive conformation [21]. The binding of ICP47 stabilizes the inward conformation, and therefore blocks TAP from transitioning to the outward state in which the nucleotide binding domains (NBDs) form a closed dimer and the translocation pathway points to the endoplasmic reticulum (ER) cavity [22]. By blocking the entry of viral antigens into ER, HSV could avoid the attrack of cytotoxic T lymphocytes (CTLs), which may lead to immune escape of HSV and establish lifelong infection in the host cells. Interestingly, the ICP47 in G47Δ is deleted, and this keeps the cell surface MHC-I-antigen expression and allows to enhance antigen presentation [18]. Furthermore, G47∆ has been proved effective in animal tumor models of various cancers such as brain cancer, prostate cancer, breast cancer, schwannoma and human melanoma [2325].
Currently, HSV US12 is widely used in OVs modification, gene therapy and vaccine construction [2527]. However, there are no reports on TRS and TRF of US12 gene in HSV. As an immediate-early protein, its expression is regulated by the tri-partite Oct-1/HCF/VP16 complex [28, 29]. Identification of additional conserved promoter regulatory sequences that might further regulate its expression is certainly an important question. Here we sequenced the transcriptional regulation region of US12 of our new HSV-1 strain LXMW, and for the first time identified novel TRS and TRF of HSV US12. These findings may have important impactions for HSV biology, infection, immunity and OVs.

Methods

Previously, our laboratory isolated a new HSV strain named HSV-1-LXMW from a male patient with oral herpes in Beijing, China [30]. The detailed content of Cells, HSV-1 isolation and identification, and HSV genomic DNA sequencing analysis have been elaborated [30].

Identification of the US12 potential transcriptional regulation region sequences in HSV

The online program NCBI (National Center for Biotechnology Information: https://​www.​ncbi.​nlm.​nih.​gov/​) was used to determine US12 potential transcriptional regulation region sequences.

Phylogenetic analysis of the transcriptional regulation region of the US12 gene

We used MEGA7 (https://​www.​megasoftware.​net/​), the application (APP), to analyze phylogenetic relationship.

Prediction of US12 transcription regulatory sequences and factors

We used online program Match (http://​gene-regulation.​com/​pub/​programs.​html) to predict the gene US12 TRS and TRF according to their instruction.

Alignment of the transcriptional regulation region sequences of US12

ApE (A plasmid Editor: http://​biologylabs.​utah.​edu/​jorgensen/​wayned/​ape/​), the application (APP), was used to make the potential transcriptional regulation region sequences alignment of gene US12 according to their manual.

Results

Identification of the US12 transcription regulatory region of HSV-1-LXMW

Using the nucleotide sequence database, we identified transcription regulatory regions of US12 (145851–148,050) as shown in Fig. 1. Please refer to supplementary material for the sequence of the transcription regulatory region. The transcription regulatory regions are 2000 bp upstream and 200 bp downstream of US12 transcription initiation sites. Interestingly, the gene that encodes ICP47 is US10, not US12 in HSV-2 strain HG52 and H1226. We summarized information about the HSV US12 genomic DNA transcription regulatory regions of our new strain and 11 other strains studied in this article (Table 1).
Table 1
HSV US12 genomic DNA sequencing
HSV Strain
Gene Bank ID
Tax-ID
Sub-Date
US12 transcription regulatory regions
University, Country
HSV-1 strain XLMW
   
145,851 / 148,050
Yangtze University, Jingzhou, China
HSV-1 strain 17
JN555585
10,299
2011-08-02
145,869 /148,068
RC University, Glasgow, UK
HSV-1 strain H129
GU734772
744,249
2010-01-18
145,769/ 147,968
Princeton University, USA
HSV-1 Strain CR38
HM585508
10,298
2013-10-17
145,315 / 147,514
MRC Virology Unit, UK
HSV-1 strain SC16
KX946970
10,309
2016-10-30
113,629/114,168
Severo Ochoa, Spain
HSV-1 strain KOS
JQ673480
10,306
2012-03-10
145,672 /147,871
University of Kansas, USA
HSV-1 strain Patton isolate
MF959544
10,308
2017-10-11
146,470 / 148,669
NYU, New York, USA
HSV-1 strain E19
HM585511
10,298
2013-10-22
144,988 / 147,187
University of Glasgow Centre for Virus Research, UK
HSV-1 strain F
GU734771
10,304
2010-01-18
145,795 / 147,994
Princeton University, USA
HSV-2 strain SD90e
KF781518
1,177,628
2013-10-25
147,503 / 149,702
Harvard Medical School, Boston, US
HSV-2 strain HG52
JN561323
10,310
2011-08-05
147,834 / 150,033
University of Glasgow, UK
HSV-2 strain H1226
KY922720
16,866
2017-09-27
147,094 /149,293
Pennslyvania State University, USA

Phylogenetic analysis of HSV-1-LXMW and other 11 HSV strains

Based on the gene US12 transcription regulatory region sequences in Table 1 of HSV-1-LXMW and other 11 HSV strains, including 8 HSV-1 strains (17, CR38, H129, SC16, KOS, Patton, E19 and F) and 3 HSV-2 strains (SD90e, HG52 and H1226), the phylogenetic analysis about the evolutionary relationship among HSV-1-LXMW and other 11 HSV strains were performed. The result shown high homology among our new strain HSV-1-LXMW and strains HSV-1-CR38, HSV-1-17 and HSV-1-H129. Our data again support that HSV-1-LXMW is a strain of HSV-1 (Fig. 2).

Identification of the US12 TRS and TRF

Better understanding of US12 transcriptional regulation is crucial for HSV biology and antitumor immune responses of oHSVs. Using Match, the online program, we find four major TRS of HSV-1-LXMW, which bind to c-Rel, HNF-4, ElK-1 and Pax-4, and three of HSV-1-17, which bind to c-Rel, HNF-4 and Pax-4. Interestingly, compared with the TRF of HSV-2, the difference between HSV-1 and HSV-2 is quite large. We find five major different kinds of TRSs of HSV-2-SD90e, which bind to HNF-4, CF2-II, E74A, Oct-1 and StuAp (Table 2).
Table 2
The US12 TRS and TRF in HSVs
HSV strain
Matrix identifier
Position strand
Core match
Matrix match
Sequence
Factor name
HSV-1 strain XLMW
V$CREL_01
37 (+)
1.000
0.982
gggtcTTTCC
c-Rel
V$HNF4_01
1020 (−)
0.883
0.898
ccctgtcCTTTTtcccacc
HNF-4
V$ELK1_02
1875(+)
1.000
0.984
ggcgcCGGAAgccc
Elk-1
V$PAX4_01
2029 (−)
0.888
0.833
gccacgggccgCTTCAcggcc
Pax-4
HSV-1 strain 17
V$CREL_01
37 (+)
1.000
0.982
gggtcTTTCC
c-Rel
V$HNF4_01
1023 (−)
0.883
0.898
ccctgtcCTTTTtcccacc
HNF-4
V$PAX4_01
2032 (−)
0.888
0.833
gccacgggccgCTTCAcggcc
Pax-4
HSV-2 strain SD90e
V$HNF4_01
746 (−)
1.000
0.928
gctcgcaCTTTGccctaat
HNF-4
I$CF2II_01
767 (−)
1.000
1.000
tatATATAc
CF2-II
V$HNF4_01
886 (−)
1.000
0.928
gctcgcaCTTTGccctaat
HNF-4
I$CF2II_01
907 (−)
1.000
1.000
tatATATAc
CF2-II
I$E74A_01
1076(+)
1.000
0.954
cgaaccCGGAAgggcag
E74A
V$OCT1_Q6
1120 (−)
0.883
0.911
ctcaTTAGCatcgcg
Oct-1
F$STUAP_01
1637 (−)
1.000
1.000
ggtCGCGAtg
StuAp
Further analysis of three more HSV-1 strains found that their TRS and TRF binding sites are similar with HSV-1-LXMW, but have minor differences (Fig. 3). Comparing to HSV-1-LXMW, there is no c-Rel binding site for HSV-1-SC16, no Elk-1 binding site for HSV-1-Patton and 17, and no Pax-4 binding site for HSV-1-Patton and E19. There is only one US12 TRS binding to HNF-4 in all the HSV-1 strains analyzed, but there are two HNF-4 binding sites in HSV-2 strains.

The TRS and TRF are conserved

Conserved sequences refer to highly similar or identical nucleic acid sequences (RNA or DNA sequences), protein sequences, and their structures. Conserved sequences generally have functional value. Here, we found that the US12 TRSs and TRF binding sites are conserved among the 9 HSV-1 and 3 HSV-2 strains (Fig. 4), indicating these conserved TRSs and TRFs are likely to be biologically functional.
Our multi-sequence alignment results indicated that in the US12 transcriptional regulation regions there are less mutations among HSV-1 strains than mutations between HSV-1 and HSV-2. Between HSV-1-LXMW and HSV-1-172,184 base pairs are matched and only 5 base pairs are mismatched. However, there are only 468 base pairs matched between the HSV-1- LXMW and HSV-2-SD90e. Therefore, we decided to compare HSV type 1 and type 2 separately in ApE Program (Aligment parameters: Blocks: 10, mismatch penalty: 0, gap penalty: 0, gap Ext penalty: 0, everything else is at default). Results shown that our new strain HSV-1-LXMW was highly similar to HSV-1-17 and HSV-1-CR38 (Fig. 4a).
The alignment of the transcription regulatory region (nucleotides 1–2200) of HSV-1-XLMW strain to other 8 HSV-1 strains SC16, Patton, KOS, H129, F, E19, CR38 and 17, respectively, shown 2177, 2023, 2182, 2165, 2167, 2150, 2184 and 2184 matched base pairs, 11, 6, 6, 11, 11, 10, 3 and 5 mismatched base pairs, and 24, 324, 26, 48, 44, 80, 26 and 21 base pair gaps (Fig. 4a). The alignment of the transcription regulatory region (nucleotides 1–2200) of HSV-2- SD90e strain to other 2 HSV-2 strains HG52 and H1226, respectively, shown 1956 and 2128 matched base pairs, 3 and 2 mismatched base pairs, and 480 and 138 base pair gaps (Fig. 4b).
A sequence with five or more conserved base pairs is defined as a conservative region. From the alignment analysis, we found 14 conserved regions of 9 HSV-1 strains and 7 conserved regions of 3 HSV-2 strains (Fig. 4). The conserved regions of HSV-1-LXMW US12 started respectively at 1, 37, 58, 70, 79, 1019, 1036, 1043, 1104, 1807, 1833, 1842, 1886, and 2007 base pairs. Interestingly, we found that most of the US12 transcriptional regulation regions are overlapped with the TRSs identified above.
There are four TRFs in HSV-1-LXMW, KOS, H129, F and CR38 strains and three TRFs in HSV-1-SC16, E19 and 17 strains and two transcription factors in HSV-1-patton strain. Additionally, the TRFs binding sites of the HSV-1 strains are basically conserved (Fig. 4a). Interestingly, TRSs in the US12 transcriptional regulatory region are identical in HSV-2 strains SD90e, HG52 and H1226 (Fig. 4b). Importantly, binding sites of c-Rel, HNF-4, Elk-1, Pax-4, CF2-II, E74A, Oct-1 or StuAp in US12 transcriptional regulation regions are also conserved among HSV-1/2. HNF-4 is conserved in both HSV-1 and HSV-2 strains. Our findings support that the conserved TRSs and TRFs binding sites are closely linked with the gene US12 functions. However, the TRSs and TRFs between HSV-1 and HSV-2 strains are quite different. Many bases are found unpaired in the sequence alignment, and that indicates different biological functions of these TRSs and TRFs in HSV-1 or HSV-2. Whether their functions exist in vivo or are related to the immune escape of HSV is not clear, thus, to validate these, further functional studies are needed.

The TRFs c-Rel and Oct-1 are functional during HSV infection

To understand whether the identified conserved TRSs and TRFs are functional or are involved in the immune escape of HSV, we did a literature search of each of these TRSs and TRFs related to HSV-1 or HSV-2. We found that the TRFs of c-Rel and Oct-1 have been reported to be expressed and functional respectively in HSV-1 and HSV-1/2 infected cells (Table 3). These data are consistent with the identification of TRF c-Rel binding site in HSV-1 and Oct-1 binding site in HSV-2 (Fig. 3), supporting that these TRSs and TRFs are biologically functional.
Table 3
The TRFs c-Rel and Oct-1 are functional during HSV infection
Tissue type
HSV strain
Oct-1
c-Rel
Function
Ref.
Kidney: Vero cells
HSV-1 strain 17
c-Rel
As a novel cause of HSE disease susceptibility.
[31]
Hematological: Jurkat cells
HSV-1
p65/c-Rel
the p65/c-Rel heterodimer is responsible for the NF-kB-dependent induction of HIV-1 LTR in HSV- 1-infected cells.
[32]
Embryonic: WT and dOct MEF cells
HSV-1 strain F
Oct-1
Oct-1 is required for the formation of HSV replication factories and late gene expression.
[33]
Digestive: Hep2 cells
HSV-1 strain KOS
Oct-1
Oct-1 directly recognizes TAATGARAT elements in promoters of IE genes.
[34]
Urinary: COS-7 cells
HSV-1 strain KOS
Oct-1
Distinct conformations of Oct-1 on the BHV IE1 sites and on the HSV IE110 sites.
[35]
Genital: HeLa cells
HSV-1 strain F
Oct-1
late in infection Oct-1 is posttranslationally modified and exhibits a reduced capacity to bind to its cognate sites.
[36]
Genital: HeLa cells
HSV-1 strain KOS
Oct-1
Ser375 is important for the interaction of VP16 with Oct-1, and that the interaction is required to enable both proteins to bind to IE promoters.
[28]
Genital: HFF
HSV-1 strain KOS
Oct-1
forms a transactivation complex with the cellular proteins HCF-1 and HSV-1 VP16 tegument protein.
[29]
Genital: HeLa cells
HSV-2 strain 333
Oct-1
the HSV-2 protein forms a transcriptional complex with the cellular Oct-1 protein and target TAATGARAT elements from immediate-early promoters.
[37]
HSE Herpes simplex encephalitis, HIV human immunodeficiency virus, LTR long terminal repeat
It is well known that HSV-1 causes buccal ulcers and encephalitis. Interestingly, it’s reported that c-Rel is a novel cause of herpes simplex encephalitis susceptibility [38]. Studies have also shown that c-Rel is involved in immune evasion via interacting with viral nuclear protein UL24 and endogenous NF-κB subunits p65 and p50, and inhibiting cGAS-STING mediated NF-κB promoter activity in HSV-1 infected cells. We would hypothesize that our newly identified HSV-1 specific c-Rel may bind to its US12 TRSs, and activate US12 (ICP47) expression in HSV-1 infected cells. In turn, ICP47 blocked HSV-1 antigen presentation, and promoted HSV-1 infection spread and herpes simplex encephalitis. Oct-1 activates IE-gene transcription through forming a transactivation complex with the cellular proteins HCF-1 and VP16 tegument protein in HSV-1 infected tissues [28, 29].
However, there was no report of US12 transcriptional regulation by c-Rel or Oct-1, no report on c-Rel expression in HSV-2 infected tissues, and no report about expression and function of the other 6 identified TRFs of HNF-4, Elk-1, Pax-4, CF2-II, E74A and StuAp, and no report of any of the TRSs identified above in HSV.

The HSV-1/2 tissue tropism and TRFs expression in different tissues

Tissue tropism is the cells and tissues of a host that support the growth of a particular virus or bacterium. Some bacteria and viruses have a wide range of tissue tropism and can infect many types of cells and tissues, while other viruses may infect mainly individual tissues. Here we summarized the HSV-1/2 tissue tropism and the TRFs expression in different tissues (Table 4). According to the results, HSV-1 specific c-Rel, Elk-1, and Pax-4 are highly expressed in tissues above the abdomen, including oral cavity, tongue and head, and Oct-1, HNF-4 and CF2-II are highly expressed in tissues within the genital system. c-Rel belongs to the nuclear factor κB (NF-κB) family, and plays a crucial role in mammalian B and T cell function [39]. Elk-1 is involved in ERK-induced cellular proliferation, and its transcriptional activity is regulated by ubiquitination at lysine 35 (K35) [40]. Pax proteins are crucial in stem cell biology and organ development. Pax-4 is known to be a major regulator of pancreatic cell development and differentiation, and its transactivation domain was localized within its C-terminal region [41]. OCT-1 (Pou2f1) is well known as a widely expressed TRFs in most cells and tissues. Recently, a series of studies have reported that OCT-1 plays a critical role in CD4+ T cell function through mediating long-range chromosomal interactions and regulating gene expression during differentiation [42]. Hepatocyte nuclear factor 4 (HNF-4) is enriched in liver extracts and belongs to the steroid hormone receptor superfamily [43]. C(2)-H(2)-type zinc-finger transcription factor II (CF2-II) may potentially regulates diverse sets of target genes during cell development and the CF2-II recognition properties depends largely on the COOH-terminal DNA binding domain [44]. E74A belongs to Ets transcription protein, which is involved in multifarious important biological processes. Study has demonstrated that ecdysone inducible TRFs E74A could directly regulate the EO gene expression in silkworm [45]. StuAp is a member of fungal TRFs family that regulates cell cycle progression or development. Further, StuAp belongs to a sub-family possessing the conserved APSES domain. Study has shown that StuAp acts as a transcriptional repressor in A.nidulans, but as a weak activator in budding yeast [46].
Table 4
The HSV-1/2 tissue tropism and the TRFs expression in different tissues
H high-expression, M middle expression, L little expression, N no-expression; The result from: http://​biogps.​org. Grading was based on fold increases compared to median fluorescence intensity on Affymetrix microarray chips at 0–2.5 (L), > 2.5- < 5 (M), > 5 (H)
System
Cell/ tissue
HSV-1
HSV-2
c-Rel
HNF-4
Elk-1
Pax-4
CF2-II
OCT-1
Blood system
CD34+ stem cell
+
_
H
H
H
H
H
H
721 B lymphoblasts
+
_
H
H
H
H
M
H
CD19 + B cell
+
_
H
H
H
H
M
H
Leukemia lymphoblastic
+
_
M
M
M
M
L
L
Bonemarrow
+
_
H
M
H
H
M
H
Pituitariy
+
_
H
H
H
H
H
M
Head
Prefrontal Cortex
+
_
H
H
H
H
H
H
Pineal
+
_
H
H
H
H
H
M
Tongue
+
_
H
M
H
H
L
M
Tonsil
+
_
H
M
M
H
L
L
Retina
+
_
H
H
H
H
H
M
Trigeminal ganglion
+
_
M
H
H
H
L
L
Cerebellum
+
_
H
H
M
H
H
M
Viscera
Heart
+
_
H
H
H
H
H
M
Lung
+
_
H
H
H
H
H
M
Liver
+
_
H
H
H
H
H
M
Kidney
+
_
M
M
M
M
H
L
Smooth Muscles
+
_
H
H
H
H
H
M
Adipocyte
+
_
H
M
M
H
L
L
Secretory system
Adrenalgland
+
_
M
M
H
H
L
L
Pancreaticlstet
+
_
H
H
H
H
H
M
Genital system
Placenta
+
+
H
H
H
M
H
M
Fetalthyroid
+
+
H
M
M
M
H
M
Uterus
+
+
M
M
M
M
M
L
Testis
+
+
M
M
M
M
H
L
Ovary
+
+
M
M
L
L
L
M

The US12 transcription and ICP47 function during the HSV infection process

To better understand the significance of the newly identified US12 transcriptional regulation, we summarize the US12 transcription and ICP47 function during the HSV infection process (Fig. 5). TAP plays a crucial role in MHC I antigen presentation and has become an important target for viral immune escape strategies. In the long-term process of virus-host co-evolution, herpes viruses independently obtained an efficient way to block TAP-mediated peptide transport via the viral immune evasion protein ICP47, which blocks the binding of peptide to TAP by capturing TAP in the endogenous conformation [27]. Interestingly, in our study, we found that two crucial TRFs, c-Rel and Oct-1, play a variety of roles in the growth, proliferation, and survival of mature T cells, which might associate with the viral immune evasion via HSV ICP47. Studies have shown that HSV-1 have evolved complex mechanisms to disrupt the antiviral response via affecting the NF-κB. For example, in HSV-1, ICP0 interacts with p65 and p50 and then degrades p50 through regulating E3 ubiquitin ligase activity [47]. Protein kinase US3 was shown to inhibit NF-κB activity via making p65 hyperphosphorylation at serine 75 and blocking its nuclear translocation [48]. Besides, ICP27 blocks the phosphorylation of IκB to inhibit NF-κB activation. Furthermore, our data also shown that c-Rel is conserved in HSV-1, which inhibits NF-κB promoter activity. Importantly, Oct-1 plays a key role in CD4 T cells, mediating long-range chromosomal interactions and differentiation through regulating gene expression, and has a critical protection effect on viruses and pathogens [42] and further, Oct-1 also is conserved in HSV-2.

Discussion

HSV ICP47 can bind TAP and block antigen presentation. Transcriptional regulation of US12 is important for ICP47 functioning. However, TRSs and TRFs of HSV US12 are seldom reported. In this study, we reported the transcriptional regulation region sequence of our newly isolated strain HSV-1-LXMW in China, and found it is closely related to HSV-1-CR38 and HSV-1-17 in UK. We identified eight different kinds of novel TRSs and TRFs of HSV US12 for the first time. These identified TRSs and TRFs are conserved among HSV-1 (c-Rel, Elk-1, Pax-4), HSV-2 (Oct-1, CF2-II, E74A, StuAp) or both of them (HNF-4). Two of the TRFs c-Rel and Oct-1 are biologically functional in vitro respectively in immune escape and viral replication during HSV infection. We further hypothesize a novel mechanism of HSV-1 encephalitis by c-Rel activated ICP47-mediated immune escape. These findings may have important implication to our understanding of HSV biology, infection, immunity and OVs.
oHSV-1 has become one of the most promising OVs at present [49]. In 2015, talimogene laherparepvec (T-VEC), a kind of oHSV, was approved by FDA for the treatment of advanced melanoma [5052]. In T-VEC, ICP47 was deleted to prevent limitation of viral antigen presentation, and increase the US11 gene expression, and virus replication in cancer cells without reducing tumor selectivity [53]. Considering that the immune escape function of ICP47, the construction of gene therapy vectors precede a new perspective. For instance, Adeno-associated virus gene therapy of Duchenne muscular dystrophy was achieved by expression ICP47 [54]. Additionally, study has also reported another recombinant adenovirus vector expressing ICP47 protein to reduce the stimulation of dendritic cells [55].
Future functional studies of these novel TRSs and TRFs, and their roles in HSV replication, infection, immunity, tissue tropism, encephalitis and OVs are warranted.

Conclusions

We identified eight different kinds of novel TRFs and TRFs of HSV US12 for the first time, and found they are conserved among HSV-1 (c-Rel, Elk-1, Pax-4), HSV-2 (Oct-1, CF2-II, E74A, StuAp) or both HSVs (HNF-4). The c-Rel and Oct-1 are biologically functional respectively in immune escape and viral replication during HSV infection. We further hypothesized a novel mechanism of HSV-1 encephalitis caused by c-Rel activated ICP47-mediated immune escape.

Supplementary information

Supplementary information accompanies this paper at https://​doi.​org/​10.​1186/​s12985-020-01365-3.

Acknowledgements

None.
Not applicable.
Not applicable.

Competing interests

The authors have declared that no competing interest exists. Consent for publication.
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Metadaten
Titel
Novel transcription regulatory sequences and factors of the immune evasion protein ICP47 (US12) of herpes simplex viruses
verfasst von
Jun-Ting Cheng
Ying-Ying Wang
Lin-Zhong Zhu
Ying Zhang
Wen-Qi Cai
Zi-Wen Han
Yang Zhou
Xian-Wang Wang
Xiao-Chun Peng
Ying Xiang
Hui-Yu Yang
Shu-Zhong Cui
Zhaowu Ma
Bing-Rong Liu
Hong-Wu Xin
Publikationsdatum
01.12.2020
Verlag
BioMed Central
Erschienen in
Virology Journal / Ausgabe 1/2020
Elektronische ISSN: 1743-422X
DOI
https://doi.org/10.1186/s12985-020-01365-3

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