The DNA damage response promotes polyomavirus JC infection by nucleus to cytoplasm NF- kappaB activation
© The Author(s). 2017
Received: 8 September 2016
Accepted: 10 February 2017
Published: 15 February 2017
Infection of glial cells by human neurotropic polyomavirus JC (JCV), the causative agent of the CNS demyelinating disease progressive multifocal leukoencephalopathy (PML), rapidly inflicts damage to cellular DNA. This activates DNA damage response (DDR) signaling including induction of expression of DNA repair factor Rad51. We previously reported that Rad51 co-operates with the transcription factor NF-κB p65 to activate JCV early transcription. Thus Rad51 induction by JCV infection may provide positive feedback for viral activation early in JCV infection. DDR is also known to stimulate NF-κB activity, a phenomenon known as nucleus to cytoplasm or “inside-out” NF-κB signaling, which is initiated by Ataxia telangiectasia mutated (ATM) protein, a serine/threonine kinase recruited and activated by DNA double-strand breaks. Downstream of ATM, there occurs a series of post-translational modifications of NF-κB essential modulator (NEMO), the γ regulatory subunit of inhibitor of NF-κB (IκB) kinase (IKK), resulting in NF-κB activation.
We analyzed the effects of downstream pathways in the DDR by phosphospecific Western blots and analysis of the subcellular distribution of NEMO by cell fractionation and immunocytochemistry. The role of DDR in JCV infection was analyzed using a small molecule inhibitor of ATM (KU-55933). NEMO sumoylation was investigated by Western and association of ATM and NEMO by immunoprecipitation/Western blots.
We show that JCV infection caused phosphorylation and activation of ATM while KU-55933 inhibited JCV replication. JCV infection caused a redistribution of NEMO from cytoplasm to nucleus. Co-expression of JCV large T-antigen and FLAG-tagged NEMO showed the occurrence of sumoylation of NEMO, while co-expression of ATM and FLAG-NEMO demonstrated physical association between ATM and NEMO.
We propose a model where JCV infection induces both overexpression of Rad51 protein and activation of the nucleus to cytoplasm NF-κB signaling pathway, which then act together to enhance JCV gene expression.
KeywordsProgressive multifocal leukoencephalopathy Polyomavirus JC DNA damage response Nuclear factor kappa-B
The human neurotropic polyomavirus JC (JCV) infects the oligodendrocytes and astrocytes of the central nervous system (CNS) causing expanding regions of demyelination within the white matter that are involved in the pathogenesis of the fatal demyelinating disease known as progressive multifocal leukoencephalopathy (PML) . Primary infection by JCV is very common and most people are seropositive for JCV beginning at an early age . In contrast, the occurrence of PML is rare and is the result of reactivation of persistent virus usually associated with severe immune dysregulation, which leads to productive infection of glial cells and onset of PML . Several types of immune dyfunction can predispose to the onset of PML and among the most common are HIV-1/AIDS  and treatment with therapeutic immunomodulatory drugs used for autoimmune diseases, e.g., natalizumab in multiple sclerosis patients [5, 6]. Our understanding of the molecular events of the JCV life cycle including the reactivation of persistent virus and the pathogenesis of PML is continuing to evolve [2, 3, 7].
JCV is a small DNA tumor virus belonging to the polyomavirus family that has a ~5.1 Kbp, circular, closed, supercoiled, double-stranded DNA genome. Both JCV and Polyomavirus BK (BKV), the causative agent of BKV-associated nephropathy, were discovered in 1971 and for decades they were the only known human polyomaviruses [1, 8]. About 6 years ago, a series of novel polyomaviruses began to be discovered and this has brought the number of human polyomaviruses that are now known to at least ten . The JCV genome is comprised of two coding regions, early and late, separated by a noncoding control region (NCCR), which contains promoter/enhancer elements and the viral origin of DNA replication, Ori . The early region encodes large T-antigen (T-Ag) and small t-antigen and the late region encodes VP1, VP2, VP3 and agnoprotein. The coding regions are transcribed in opposite directions from the NCCR, which is a bidirectional promoter containing the binding sites for the cellular and viral transcription factors that regulate JCV gene expression [11, 12].
Earlier work in our laboratory implicated the NF-κB signaling pathway and induction of expression of the Rad51 DNA repair protein as key regulators of the transcriptional status of JCV in the early stages of infection [13–18]. The JCV NCCR has a unique binding site for NF-κB and serves as a central nexus for regulation of JCV transcriptional activity. This site mediates modulation of JCV gene expression in response to a number of different stimuli including activation of the NF-κB signaling pathway by cytokines , other signal transducing transcription factors that cooperate or interfere with NF-κB stimulation such as NFAT4  and C/EBPβ , as well as epigenetic regulatory events involving protein acetylation [16, 18]. Importantly, Rad51 expression is rapidly induced by JCV infection  and co-operates with NF-κB to stimulate JCV transcription and providing a positive feedback loop early in infection .
Rad51 is a key component of the cellular machinery for homologous recombination-directed double-strand break DNA repair that is the eukaryotic homologue of Escherichia coli RecA and highly conserved over many species [20, 21]. In an earlier study of JCV infection of primary human fetal astrocytes , we found a substantial induction of DNA damage and genomic instability reflected in changes in ploidy, increased micronuclei formation and an induction of the levels of phospho-histone2AX (γH2AX), a marker for double-strand breaks that recruits and targets multiple activities involved in DNA repair . Concomitantly, JCV infection caused an induction in the expression levels of several enzymes involved in DNA repair, including a massive elevation in Rad51 expression . In another other study, we found that Rad51 binds and activates the p65 subunit of NF-κB p65 and thus functions as a transcription factor [23, 24]. In the light of this observation, we next investigated a role for Rad51 on JCV transcription and replication and found that Rad51 activated transcription of the JCV early promoter . This activation was co-operative with NF-κB p65 and could be abrogated either by mutation of the JCV NF-κB binding site or by co-expression of a dominant negative form of IκBα to sequester NF-κB indicating that Rad51 induction of JCV transcription operates through the NF-κB site . Thus Rad51 and NF-κB are parts of a positive feedback mechanism that serves to enhance JCV gene expression during the early stage of viral infection.
In resting cells, NF-κB is sequestered in an inactive form in the cytoplasm by the inhibitory molecule, IκB, but can be released upon cellular stimulation allowing active NF-κB to enter the nucleus and stimulate the transcription of specific genes . In the case of JCV, stimulation by extracellular proinflammatory cytokines such as TNF-α activates NF-κB by this pathway and strongly stimulates both early and late viral transcription, which may have a role in the reactivation of dormant virus . As well as the canonical pathway of NF-κB activation, the DNA damage response (DDR) is also known to result in the activation of the NF-κB signaling pathway, a phenomenon known as nucleus to cytoplasm or “inside-out” NF-κB signaling [26–28], which is mediated by NF-κB essential modulator (NEMO), also known as IKK-γ, a subunit of the IκB kinase complex that mediates activation of NF-κB. Since JCV infection results in both the induction of Rad51 expression and DNA damage, it is possible that DDR-mediated nucleus to cytoplasm activation of the NF-κB pathway occurs and that crosstalk between these pathway allows them to act together to stimulate JCV transcription. In this study, we examine nucleus to cytoplasm NF-κB signaling in relation to JCV infection of glial cells.
Cell culture and plasmids
Culture of the human TC620 oligodendroglioma cell line and SVG-A, a cell line originally derived from human glial cells transformed by origin-defective SV40 that expresses SV40 T-Ag was as previously described [14, 29]. Expression plasmid pCMV-T-Ag expressing JCV T-antigen has been previously described . Expression plasmids for human ATM and FLAG-tagged human NEMO are from Addgene (Cambridge, MA).
Mouse monoclonal antibody to phospho-ATM (Ser1981, clone 10H11.E12) and rabbit monoclonal antibodies to total ATM (clone D2E2), Chk1 and phospho-Chk1(Ser 317) were from Cell Signaling Technology (Danvers, MA) and Chk2 and phospho-Chk2(Thr 68) from Santa Cruz Biotechnology, Inc. (Dallas, TX). Mouse anti-α-tubulin (clone B512) and anti-FLAG were from Sigma Aldrich (St. Louis, MO) and mouse anti-lamin A/C (clone 4C11) was from Cell Signaling Technology. Mouse monoclonal antibody to T-antigen (Ab-2 PAb416 DP02) was from Calbiochem (La Jolla, CA). Anti-VP1 antibody (AB597) was kindly provided by W. Atwood, Brown University, Rhode Island). Rabbit polyclonal anti-JCV agnoprotein antibody was previously described .
KU-55933(2-morpholin-4-yl-6-thianthren-1-yl-pyran-4-one), which is an ATP competitive inhibitor of ATM , CP466722 and doxorubicin were purchased from Sigma Aldrich (St. Louis, MO).
Cells were harvested as we have described [13, 33, 34] except for experiments to measure sumoylation where iodoacetemide (10 mM) was added to the lysis and wash buffers to preserve SUMOylation. Western blots were performed as described [33, 35, 36]. Briefly, 50 μg of protein was resolved by SDS-PAGE, transferred to nitrocellulose, and immunoblotted with primary antibody (1/1000 dilution) and secondary antibody (1/10000 dilution). Bound antibody was detected with the LI-COR system. Blots were incubated with IRDye® 680RD Goat Anti-Mouse Li-COR dyes and visualized with an Odyssey® CLx Imaging System (LI-COR, Inc., Lincoln, NE) using LI-COR Odyssey software. Band intensities were quantified using the Quantity One software (Bio-Rad, Hercules CA) and intensities normalized to loading control as previously described .
Transfection of expression plasmids was performed using Lipofectamine 2000 (Life Technologies Inc., Carlsbad CA) was performed as we have previously described [33, 34]. The total amount of transfected DNA was normalized with empty vector DNA.
TC620 cells were transfected with expression plasmids for FLAG-NEMO and JCV T-Ag, whole cell extracts prepared and IP/Western performed as we have described [33, 34]. ATM was immunoprecipitated followed by Western blot for FLAG or vice versa for the reciprocal IP/Western.
To assess cell viability after treatment, the MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) assay was performed with 5 mg/ml MTT (Amresco, Solon, OH) using an absorbance reader to determine optical density at a wavelength of 570 nm.
Infection experiments were performed with SVG-A cells. Cells were transfected with expression plasmids or treated with KU-55933 as specified in the respective Figure Legends and infected with Mad-1 JCV at an MOI of 1 as we have previously described [37, 38], harvested and analyzed after 7 days together with uninfected control cultures. Expression of the viral proteins VP1 and agnoprotein was measured in whole cell protein extracts by Western blot. In parallel, the growth medium of the cells was also collected to measure viral load by Q-PCR .
SVGA cells were infected with Mad-1 JCV at an MOI of 1 and harvested at various time points after infection to isolate nuclear and cytoplasmic fractions using the NE-PER nuclear and cytoplasmic extraction kit according to the manufacturer’s instructions (Thermo Scientific Pierce, Rockford IL; Cat. #PI-78835) as we have previously described [17, 33, 35].
ICC was performed as we have recently described . SVGA cells were infected with wild-type Mad-1 JCV and transfected twice with expression plasmid for FLAG-NEMO on days 2 and 5 postinfection. Cells were fixed in 4% paraformaldehyde, in PBS for 10 min, washed, permeabilized for 5 min with 0.1% Triton X-100, blocked with 5% normal goat serum for 30 min and incubated for 3 h at 37°C with mouse anti-FLAG or mouse anti-VP1 antibody at a 1:100 dilution in PBS. Cells were then washed, incubated for 2 h with secondary FITC-conjugated goat anti-mouse secondary antibody at a 1:200 dilution, washed, mounted with 4',6-diamidino-2-phenylindole (DAPI)-containing mounting medium (VECTASHIELD, Vector Laboratories Inc. Burlingame, CA), and viewed by fluorescence microscopy.
JCV infection of glial cells results in phosphorylation of ATM
ATM inhibition restrains JCV infection of glial cells
Comparison of JCV infection of glial cells to treatment with a chemical activator of the DDR on the phosphorylation of ATM
To compare to the induction phospho-ATM in response to JCV infection to treatment with doxorubicin, a known chemical activator of the DDR, SVGA were infected with JCV for 3d and 7d or treated with doxorubicin for 3d and 5d (7d treatment was toxic to the cells). Both JCV infection and treatment with doxorubicin caused induction phospho-ATM of a comparable order of magnitude (Fig. 1f).
JCV infection causes the phosphorylation of proteins in the ATM kinase signal transduction pathway
The activation of the serine/threonine-specific protein kinase, ATM, is the upstream event in a signal transduction pathway, which is initiated in response to DNA damage. In order to further explore the activation of the DNA damage response, we investigated the phosphorylation/activation status of the intermediate protein kinases Chk1 (Fig. 2a) and Chk2 (Fig. 2b) in this pathway using phospho-specific antibodies. For each, the amount of total Chk1 and Chk2 protein was also measured and phosphorylation was normalized to this (Fig. 2c & d). Additionally, the levels of loading controls were measured for each Western by quantifying expression of glyceraldehede-3-phosphate dehydrogenase (Fig. 2e) or α-tubulin (Fig. 2f). The levels of Chk1 and Chk2 phosphorylation were increased by 2.9-fold and 3-fold respectively when cells were infected by JCV. Thus both Chk1 and Chk2 are activated by JCV infection.
JCV infection causes the subcellular redistribution of NEMO to the nucleus as determined by subcellular fractionation
JCV infection causes the subcellular redistribution of NEMO to the nucleus as determined by immunocytochemistry
JCV large T-Ag causes the sumoylation of NEMO
ATM and NEMO physical associate with each other
In the next step of nucleus to cytoplasm NF-κB activation, NEMO associates with activated ATM and ATM phosphorylates NEMO to promote its ubiquitin-dependent nuclear export . To investigate physical association between ATM and NEMO, we transfected cells with expression plasmids for ATM and FLAG-NEMO and used whole cell extract for immunoprecipitation with an antibody to ATM. Western blot with α-FLAG antibody to detect NEMO, showed that NEMO had co-immunoprecipitated with ATM but not in the nonimmune rabbit serum (NRS) negative control (Fig. 5b). Reciprocally when whole cell extract was immunoprecipitated with mouse anti-FLAG to immunoprecipitate NEMO, ATM was co-immunoprecipitated but in the nonimmune mouse serum (NMS) negative control (Fig. 5c). We conclude that ATM and NEMO physically associate with each other.
Here we report that infection of glial cells by JCV activates the nucleus to cytoplasm or “inside out” pathway of NF-κB signaling. The first step in this pathway is activation of the ATM by DNA damage serine/threonine-specific protein kinase, which can be measured by phosphospecific Western blot for the autophosphorylated form of the protein (Ser1981) that is the activated form . This finding was not surprising since we have already reported that phosphorylation of H2AX, a downstream target of ATM in the DDR, occurs after JCV infection . We also investigated the phosphorylation of two other signaling intermediates downstream of ATM, the checkpoint kinases Chk1 and Chk2 and found that they are both activated by phosphorylation on serine 317 (Chk1) and threonine 68 (Chk2).
A key step downstream of ATM in nucleus to cytoplasm NF-κB activation is the translocation of NEMO to the nucleus and its sumoylation. We now report that both of these events occur after JCV infection. Interestingly, it is known that NEMO translocation and sumoylation is independent of ATM activation . Indeed, other stress conditions, including oxidative stress, ethanol exposure, heat shock and electric shock, also induce NEMO SUMOylation . Thus DNA damage per se is not necessary for sumoylation of NEMO to occur. The nature of the stress incurred by JCV infection that induces NEMO sumoylation is not known but it is possible that the oncogenic stress arising from the disruption of multiple cellular signaling pathways by T-Ag expression may be involved  in addition to the effect of DNA damage.
From earlier studies, it is known that active NF-κB translocation to the nucleus [45, 46] stimulates transcription of NF-κB-dependent genes including both the early and late genes of JCV as described in our earlier studies [13–18, 35, 36]. JCV infection-induced DDR signaling is associated with a large elevation in the expression level of Rad51 protein , which then physically associates with NF-κB and augment its function  and stimulate transcription of JCV early gene expression . Activation of JCV transcription by Rad51 is abrogated by mutation of the NF-κB binding site or addition of siRNA to NF-κB p65 . This indicates that Rad51 induction resulting from JCV infection with JCV acts through NF-κB to stimulate JCV early transcription. Since we now show NF-κB activation is itself induced by JCV infection, this suggests the operation of a novel two-part positive feedback mechanism that enhances viral gene expression early in infection.
The induction of the DDR by infection may be a general feature of polyomaviruses  as indeed is also the case for many other types of both DNA and RNA viruses [48–51]. The closely related BKV has also been reported to induce the DDR: infection of the natural host cells of the virus, renal proximal tubule epithelial (RPTE) cells, activated both the ATM and the ATR (ATM and Rad3-related) DDR . Knockdown of ATM or ATR by RNA interference reduced BKV replication and virion production while double knockdown had an additive effect indicating that DDR induction is critical for productive BKV infection . Further analysis revealed that neither input virus nor expression alone was sufficient to trigger ATM or ATR activation but rather ATM- and ATR-mediated DDR is associated with viral DNA replication . For the rhesus macaque monkey polyomavirus SV40, infection of permissive CV1 or BSC40 monkey cells causes activation of ATM signaling [54, 55], H2AX phosphorylation and Mre11-Rad50-Nbs1 assembly with T-antigen together with other DDR-signaling proteins in viral replication foci. Inhibition of ATM kinase showed that this is a prerequisite for optimal viral replication . Hein et al.  found that expression of SV40 large T-antigen alone, without a viral replication origin, induced DDR markers including γ-H2AX, p53 nuclear foci and other signaling components downstream of ATM and ATR kinases such as CHK1 and CHK2. Large T-antigen also induced apparent DNA damage as measured by COMET assay, the Fanconi anemia pathway and Rad51 foci . It was further demonstrated using Rad51 siRNA that Rad51 is required for efficient viral replication  similar to the role of Rad51 that we have reported in JCV replication . Activation of the ATM pathway has also been reported for mouse polyomavirus  and human Merkel cell carcinoma virus . In addition to polyomaviruses, DDR activation as a general feature of other viruses including herpesviruses  and papillomaviruses . For example, Kaposi sarcoma-associated herpes virus (KSHV) expresses genes which selectively modulate the DDR through the activation of the ATM pathway  and human papillomavirus (HPV) activates both the ATM and ATR DDR pathways .
In the case of JCV, besides our study described here, there is one other report of the activation of ATM by viral infection . In this report, infection by JCV or transient transfection with a T-Ag expression plasmid resulted in activation of ATM and ATR causing cells to accumulate in the G2 phase of the cell cycle. Inhibition of ATM and ATR by caffeine suppressed JCV replication and virus production . These studies showed the role of ATM and ATR signaling in the JCV life cycle. However, our study described here is the first to report the involvement of the nucleus to cytoplasm pathway of NF-κB activation downstream of ATM by JCV or by any other polyomavirus.
In summary, our results reported here describe the novel finding that DNA damage following JCV infection by JCV activates ATM and initiates nucleus to cytoplasm NF-κB signaling. In this way, JCV is able to enhance expression of its own genes and promote the viral life cycle, which may be important in the pathogenesis of PML since it provides potential positive feedback during viral reactivation.
We thank past and present members of the Center for Neurovirology for their insightful discussion and sharing of ideas and reagents. Anna Bellizzi was partially supported by a Post-Doctoral Fellowship for Research Abroad 2014 from Institute Pasteur Cenci-Bolognetti Foundation in Rome, Italy. This study utilized services offered by the Comprehensive NeuroAIDS Center (CNAC NIMH Grant Number p30MH092177) at Temple University School of Medicine. This work was supported by grant R01 AI077460 awarded by the NIH to MKW.
The funding organizations played no role in the design of the study, in the collection, analysis, and interpretation of the data and in the decision to submit the manuscript for publication.
Availability of data and material
Please contact author for data requests.
Conceived and designed the experiments: HSW and MKW. Performed the experiments: HSW, AB and GI. Analyzed the data: HSW, AB and MKW. Wrote the paper: MKW and HSW. Critically revised the manuscript for important intellectual content: AB, VP and ATP. All authors read and approved the final manuscript.
The authors declare that they have no competing interests.
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- Padgett BL, Walker DL, ZuRhein GM, Eckroade RJ, Dessel BH. Cultivation of papova-like virus from human brain with progressive multifocal leukoencephalopathy. Lancet. 1971;i:1257–60.View ArticleGoogle Scholar
- White MK, Khalili K. Pathogenesis of progressive multifocal leukoencephalopathy – revisited. J Infect Dis. 2011;203:578–86.View ArticlePubMedPubMed CentralGoogle Scholar
- Wollebo HS, White MK, Gordon J, Berger JR, Khalili K. Persistence and pathogenesis of the neurotropic polyomavirus JC. Ann Neurol. 2015;77:560–70.View ArticlePubMedPubMed CentralGoogle Scholar
- Kedar S, Berger JR. The changing landscape of progressive multifocal leukoencephalopathy. Curr Infect Dis Rep. 2011;13:380–6.View ArticlePubMedGoogle Scholar
- Berger JR. Progressive multifocal leukoencephalopathy and newer biological agents. Progressive multifocal leukoencephalopathy and newer biological agents. Drug Saf. 2010;33:969–83.View ArticlePubMedGoogle Scholar
- Berger JR, Fox RJ. Reassessing the risk of natalizumab-associated PML. J Neurovirol. 2016;22:533–5.View ArticlePubMedGoogle Scholar
- White MK, Sariyer IK, Gordon J, Delbue S, Pietropaolo V, Berger JR, Khalili K. Diagnostic assays for polyomavirus JC and progressive multifocal leukoencephalopathy. Rev Med Virol. 2016;26:102–14.View ArticlePubMedGoogle Scholar
- Gardner SD, Field AM, Coleman DV, Hulme B. New human papovavirus (B.K.) isolated from urine after renal transplantation. Lancet. 1971;19:1253–7.View ArticleGoogle Scholar
- White MK, Gordon J, Khalili K. Human polyomaviruses: a rapidly expanding family and the challenges in elucidating their roles in human pathology. PLoS Pathog. 2013;9, e1003206.View ArticlePubMedPubMed CentralGoogle Scholar
- Frisque RJ, Bream GL, Cannella MT. Human polyomavirus JC virus genome. J Virol. 1984;51:458–69.PubMedPubMed CentralGoogle Scholar
- White MK, Safak M, Khalili K. Regulation of gene expression in primate polyomaviruses. J Virol. 2009;83:10846–56.View ArticlePubMedPubMed CentralGoogle Scholar
- DeCaprio JA, Imperiale MJ, Major EO. Polyomaviruses. In: Knipe DM, Howley PM, editors. Fields Virology, Sixth Edition. Philadelphia: Lippincott, Williams & Wilkins; 2013. p. 6133–61.Google Scholar
- Romagnoli L, Wollebo HS, Deshmane SL, Mukerjee R, Del Valle L, Safak M, et al. Modulation of JC virus transcription by C/EBPβ. Virus Res. 2009;146:97–106.View ArticlePubMedPubMed CentralGoogle Scholar
- Wollebo HS, Safak M, Del Valle L, Khalili K, White MK. Role for tumor necrosis factor-alpha in JC virus reactivation and progressive multifocal leukoencephalopathy. J Neuroimmunol. 2011;233:46–53.View ArticlePubMedGoogle Scholar
- Wollebo HS, Melis S, Khalili K, Safak M, White MK. Cooperative Roles of NF-κB and NFAT4 in polyomavirus JC regulation at the KB control element. Virology. 2012;432:146–54.View ArticlePubMedPubMed CentralGoogle Scholar
- Wollebo HS, Woldemichaele B, Khalili K, Safak M, White MK. Epigenetic regulation of polyomavirus JC. Virol J. 2013;10:264.View ArticlePubMedPubMed CentralGoogle Scholar
- White MK, Kaminski R, Khalili K, Wollebo HS. Rad51 activates polyomavirus JC early transcription. PLoS One. 2014;9, e110122.View ArticlePubMedPubMed CentralGoogle Scholar
- Wollebo HS, Bellizzi A, Cossari DH, Safak M, Khalili K, White MK. Epigenetic regulation of polyomavirus JC involves acetylation of specific lysine residues in NF-κB p65. J Neurovirol. 2015;21:679–87.View ArticlePubMedPubMed CentralGoogle Scholar
- Darbinyan A, White MK, Akan S, Radhakrishnan S, Del Valle L, Amini S, Khalili K. Alterations of DNA damage repair pathways resulting from JCV infection. Virology. 2007;364:73–86.View ArticlePubMedPubMed CentralGoogle Scholar
- Baumann P, West SC. Role of the human RAD51 protein in homologous recombination and double-stranded-break repair. Trends Biochem Sci. 1998;23:247–51.View ArticlePubMedGoogle Scholar
- Featherstone C, Jackson SP. DNA double-strand break repair. Curr Biol. 1999;9:R759–61.View ArticlePubMedGoogle Scholar
- Thiriet C, Hayes JJ. Chromatin in need of a fix: phosphorylation of H2AX connects chromatin to DNA repair. Mol Cell. 2005;18:617–22.View ArticlePubMedGoogle Scholar
- Rom I, Darbinyan A, White MK, Rappaport J, Sawaya BE, Amini S, Khalili K. Activation of HIV-1 LTR by Rad51 in microglial cells. Cell Cycle. 2010;9:3715–22.View ArticlePubMedPubMed CentralGoogle Scholar
- Kaminski R, Wollebo HS, Datta PK, White MK, Amini S, Khalili K. Interplay of Rad51 with NF-κB Pathway Stimulates Expression of HIV-1. PLoS One. 2014;9, e98304.View ArticlePubMedPubMed CentralGoogle Scholar
- Hoffmann A, Baltimore D. Circuitry of nuclear factor kappaB signaling. Immunol Rev. 2006;210:171–86.View ArticlePubMedGoogle Scholar
- Habraken Y, Piette J. NF-kappaB activation by double-strand breaks. Biochem Pharmacol. 2006;72:1132–41.View ArticlePubMedGoogle Scholar
- Miyamoto S. Nuclear initiated NF-κB signaling: NEMO and ATM take center stage. Cell Res. 2011;21:116–30.View ArticlePubMedGoogle Scholar
- McCool KW, Miyamoto S. DNA damage-dependent NF-κB activation: NEMO turns nuclear signaling inside out. Immunol Rev. 2012;246:311–26.View ArticlePubMedPubMed CentralGoogle Scholar
- Wollebo HS, Bellizzi A, Kaminski R, Hu W, White MK, Khalili K. CRISPR/Cas9 system as an agent for eliminating Polyomavirus JC infection. PLoS One. 2015;10, e0136046.View ArticlePubMedPubMed CentralGoogle Scholar
- Gallia GL, Safak M, Khalili K. Interaction of the single-stranded DNA-binding protein Puralpha with the human polyomavirus JC virus early protein T-antigen. J Biol Chem. 1998;273:32662–9.View ArticlePubMedGoogle Scholar
- Safak M, Sadowska B, Barrucco R, Khalili K. Functional interaction between JC virus late regulatory agnoprotein and cellular Y-box binding transcription factor, YB-1. J Virol. 2002;76:3828–38.View ArticlePubMedPubMed CentralGoogle Scholar
- Hickson I, Zhao Y, Richardson CJ, Green SJ, Martin NM, Orr AI, et al. Identification and characterization of a novel and specific inhibitor of the ataxia-telangiectasia mutated kinase ATM. Cancer Res. 2004;64:9152–9.View ArticlePubMedGoogle Scholar
- White MK, Skowronska A, Gordon J, Del Valle L, Deshmane SL, Giordano A, Khalili K. Analysis of a mutant p53 protein arising in a medulloblastoma from a mouse transgenic for the JC virus early region. Anticancer Res. 2006;26:4079–92.PubMedGoogle Scholar
- Bellizzi A, White MK, Wollebo HS. Degradation of polyomavirus JC T-antigen by stress involves the LIP isoform of C/EBP. Cell Cycle. 2015;14:2075–9.View ArticlePubMedPubMed CentralGoogle Scholar
- Wollebo HS, Bellizzi A, Cossari DH, Salkind J, Safak M, White MK. The Brd4 acetyl-lysine-binding protein is involved in activation of polyomavirus JC. J Neurovirol 2016;(In Press).Google Scholar
- Wollebo HS, Cotto B, Adiga R, Langford D, White MK. Expression of signaling molecules in progressive multifocal leukoencephalopathy. Curr HIV Res. 2016;14:47–53.View ArticlePubMedPubMed CentralGoogle Scholar
- Radhakrishnan S, Otte J, Enam S, Del Valle L, Khalili K, Gordon J. JC virus-induced changes in cellular gene expression in primary human astrocytes. J Virol. 2003;77:10638–44.View ArticlePubMedPubMed CentralGoogle Scholar
- Radhakrishnan S, Gordon J, Del Valle L, Cui J, Khalili K. Intracellular approach for blocking JC virus gene expression by using RNA interference during viral infection. J Virol. 2004;78:7264–9.View ArticlePubMedPubMed CentralGoogle Scholar
- Shiloh Y, Ziv Y. The ATM protein kinase: regulating the cellular response to genotoxic stress, and more. Nat Rev Mol Cell Biol. 2013;14:197–210.View ArticleGoogle Scholar
- Bakkenist CJ, Kastan MB. DNA damage activates ATM through intermolecular autophosphorylation and dimer dissociation. Nature. 2003;421:499–506.View ArticlePubMedGoogle Scholar
- Huang TT, Wuerzberger-Davis SM, Wu ZH, Miyamoto S. Sequential modification of NEMO/IKKgamma by SUMO-1 and ubiquitin mediates NF-kappaB activation by genotoxic stress. Cell. 2003;115:565–76.View ArticlePubMedGoogle Scholar
- Wu ZH, Shi Y, Tibbetts RS, Miyamoto S. Molecular linkage between the kinase ATM and NF-kappaB signaling in response to genotoxic stimuli. Science. 2006;311:1141–6.View ArticlePubMedGoogle Scholar
- Wuerzberger-Davis SM, Nakamura Y, Seufzer BJ, Miyamoto S. NF-kappaB activation by combinations of NEMO SUMOylation and ATM activation stresses in the absence of DNA damage. Oncogene. 2007;26:641–51.View ArticlePubMedGoogle Scholar
- White MK, Khalili K. Polyomaviruses and human cancer: molecular mechanisms underlying patterns of tumorigenesis. Virology. 2004;324:1–16.View ArticlePubMedGoogle Scholar
- Ghosh S, Karin M. Missing pieces in the NF-kappaB puzzle. Cell. 2002;109(Suppl):S81–96.View ArticlePubMedGoogle Scholar
- Karin M, Ben-Neriah Y. Phosphorylation meets ubiquitination: the control of NF-κB activity. Annu Rev Immunol. 2000;8:621–63.View ArticleGoogle Scholar
- Justice JL, Verhalen B, Jiang M. Polyomavirus interaction with the DNA damage response. Virol Sin. 2015;30:122–9.View ArticlePubMedGoogle Scholar
- Sinclair A, Yarranton S, Schelcher C. DNA-damage response pathways triggered by viral replication. Expert Rev Mol Med. 2006;8:1–11.View ArticlePubMedPubMed CentralGoogle Scholar
- Turnell AS, Grand RJ. DNA viruses and the cellular DNA-damage response. J Gen Virol. 2012;93:2076–97.View ArticlePubMedGoogle Scholar
- McFadden K, Luftig MA. Interplay between DNA tumor viruses and the host DNA damage response. Curr Top Microbiol Immunol. 2013;371:229–57.PubMedGoogle Scholar
- Ryan EL, Hollingworth R, Grand RJ. Activation of the DNA Damage Response by RNA Viruses. Biomolecules. 2016;6:2.View ArticlePubMedPubMed CentralGoogle Scholar
- Jiang M, Zhao L, Gamez M, Imperiale MJ. Roles of ATM and ATR-mediated DNA damage responses during lytic BK polyomavirus infection. PLoS Pathog. 2012;8, e1002898.View ArticlePubMedPubMed CentralGoogle Scholar
- Verhalen B, Justice JL, Imperiale MJ, Jiang M. Viral DNA replication-dependent DNA damage response activation during BK polyomavirus infection. J Virol. 2015;89:5032–9.View ArticlePubMedPubMed CentralGoogle Scholar
- Shi Y, Dodson GE, Shaikh S, Rundell K, Tibbetts RS. Ataxia-telangiectasia-mutated (ATM) is a T-antigen kinase that controls SV40 viral replication in vivo. J Biol Chem. 2005;280:40195–200.View ArticlePubMedGoogle Scholar
- Zhao X, Madden-Fuentes RJ, Lou BX, Pipas JM, Gerhardt J, Rigell CJ, Fanning E. Ataxia telangiectasia-mutated damage-signaling kinase- and proteasome-dependent destruction of Mre11-Rad50-Nbs1 subunits in Simian virus 40-infected primate cells. J Virol. 2008;82:5316–28.View ArticlePubMedPubMed CentralGoogle Scholar
- Hein J, Boichuk S, Wu J, Cheng Y, Freire R, Jat PS, Roberts TM, Gjoerup OV. Simian virus 40 large T antigen disrupts genome integrity and activates a DNA damage response via Bub1 binding. J Virol. 2009;83:117–27.View ArticlePubMedGoogle Scholar
- Boichuk S, Hu L, Hein J, Gjoerup OV. Multiple DNA damage signaling and repair pathways deregulated by simian virus 40 large T antigen. J Virol. 2010;84:8007–20.View ArticlePubMedPubMed CentralGoogle Scholar
- Dahl J, You J, Benjamin TL. Induction and utilization of an ATM signaling pathway by polyomavirus. J Virol. 2005;79:13007–17.View ArticlePubMedPubMed CentralGoogle Scholar
- Tsang SH, Wang X, Li J, Buck CB, You J. Host DNA damage response factors localize to Merkel cell polyomavirus DNA replication sites to support efficient viral DNA replication. J Virol. 2014;88:3285–97.View ArticlePubMedPubMed CentralGoogle Scholar
- Di Domenico EG, Toma L, Bordignon V, Trento E, D'Agosto G, Cordiali-Fei P, Ensoli F. Activation of DNA Damage Response Induced by the Kaposi's Sarcoma-Associated Herpes Virus. Int J Mol Sci. 2016;17.Google Scholar
- Wallace NA, Galloway DA. Manipulation of cellular DNA damage repair machinery facilitates propagation of human papillomaviruses. Semin Cancer Biol. 2014;26:30–42.View ArticlePubMedGoogle Scholar
- Orba Y, Suzuki T, Makino Y, Kubota K, Tanaka S, Kimura T, Sawa H. Large T antigen promotes JC virus replication in G2-arrested cells by inducing ATM- and ATR-mediated G2 checkpoint signaling. J Biol Chem. 2010;285:1544–54.View ArticlePubMedGoogle Scholar