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Journal of Virology, June 2003, p. 7101-7105, Vol. 77, No. 12
0022-538X/03/$08.00+0     DOI: 10.1128/JVI.77.12.7101-7105.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

Promyelocytic Leukemia Protein Mediates Interferon-Based Anti-Herpes Simplex Virus 1 Effects

Ana V. Chee,1 Pascal Lopez,1 Pier Paolo Pandolfi,2 and Bernard Roizman1*

The Marjorie B. Kovler Viral Oncology Laboratories, The University of Chicago, Chicago, Illinois 60637,1 Molecular Biology Program and Department of Pathology, Memorial Sloan-Kettering Cancer Center, New York, New York 100212

Received 8 January 2003/ Accepted 19 March 2003


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ABSTRACT
 
Herpes simplex virus (HSV) 1 disaggregates the nuclear domain 10 (ND10) nuclear structures and disperses its organizing promyelocytic leukemia protein (PML). An earlier report showed that ectopic overexpression of PML precludes the disaggregation of ND10 but has no effect on viral replication. PML has been reported to mediate the effects of interferon (IFN) and viral mutants lacking ICP0 ({Delta}{alpha}0 mutants). To test the hypothesis that HSV disaggregates ND10 structures and disperses PML to preclude IFN-mediated antiviral effects, we tested the accumulation of viral proteins and virus yields from murine PML+/+ and PML-/- cells mock treated or exposed to IFN-{alpha}, IFN-{gamma}, or both and infected with the wild-type or {Delta}{alpha}0 mutant virus. We report the following results. (i) The levels of growth of wild-type and mutant viruses and of accumulation of viral proteins were not significantly different in untreated PML+/+ and PML-/- cells. (ii) Major effects of IFN-{alpha} and -{gamma} were observed in PML+/+ cells infected with the {Delta}{alpha}0 mutant virus, and more minor effects were observed in cells infected with the wild-type virus. The effects of the IFNs on either wild-type or the mutant virus in PML-/- cells were minimal. (iii) The mixture of IFN-{alpha} and -{gamma} was more effective than either IFN alone, but again, the effect was more drastic in PML+/+ cells than in PML-/- cells. We concluded that the anti-HSV state induced by exogenous IFN is mediated by PML and that the virus targets the ND10 structures and disseminates PML in order to preclude the establishment of the antiviral state induced by IFNs.


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TEXT
 
A characteristic feature of cells infected with herpes simplex virus 1 (HSV-1) is the rapid disappearance of the nuclear structures known by any of several names such as nuclear domain 10 (ND10), nuclear bodies, Kremer (Kr) bodies, or promyelocytic leukemia protein (PML) oncogenic domains (13, 20, 24). PML is dispersed from the ND10 structures soon after infection (7, 22, 23). The disaggregation of these structures and the dispersal of PML have been shown to be mediated by infected-cell protein no. 0 (ICP0), a product of the {alpha}0 gene (25, 26).

PML is considered to be the organizing protein of the ND10 structures (14, 35). Indeed, in transduced cells forced to overexpress PML, the ND10 structures increase in size and the apparent content of their other constituent proteins increases (19). A central question that is the basis of the studies reported here is why HSV and many other viruses target PML and the ND10 structures. An earlier article from this laboratory showed that in transduced cells forced to overexpress PML the ND10 structures remained intact throughout infection but that overexpression of PML had no effect on viral gene expression or viral yields (19).

PML has been reported to have numerous functions in uninfected cells. It has been implicated in several cellular processes, including cell proliferation, senescence, tumorigenesis, apoptosis, resistance to virus infection, and hormone signaling (5, 11, 16, 18, 21, 27, 30, 31, 32, 34, 36). Perhaps the function attributed to PML that is most relevant to its potential role in HSV-1-infected cells is its mediation of the function of interferons (IFNs). The antiviral functions of PML have been described previously (21, 24, 27). The PML promoter contains IFN response elements (29), and the accumulation of PML, ISG120, SP140, SP100, and proteasome components is increased after IFN treatment (8-10, 12, 17). If the virus targets PML because the latter enables and mediates the repressive effects of IFNs on viral replication, then the overexpression of PML should have a minimal effect on viral replication since the amounts normally resident in the cells should suffice. The prediction, therefore, is that, if the function of IFN is mediated by PML, IFNs should have a greater effect on HSV-1 replication in PML+/+ cells than in PML-/- cells.

IFNs inhibit viral protein synthesis more effectively in PML+/+ cells than in PML-/- cells. To test the hypothesis that IFNs inhibit viral protein synthesis more effectively in PML+/+ cells that in PML-/- cells, we carried out a series of experiments with mouse fibroblasts derived from embryos of wild-type (PML+/+) and PML-/- mice described elsewhere (31). In these experiments, replicate PML+/+ or PML-/- cells grown in 25-cm2 flasks were either mock treated or treated with 1,000 U of either murine IFN-{alpha} or IFN-{gamma} or with 1,000 U of both IFN-{alpha} and IFN-{gamma} per ml of medium. Recombinant murine IFN-{alpha} (catalog number 12500-1) and IFN-{gamma} (catalog number 12100-1) were purchased from PBL Biomedical Laboratories (New Brunswick, N.J.). After 24 h of exposure, the cells were infected with either 0.1, 1, or 10 PFU of wild-type virus [HSV-1(F)] or the recombinant virus R7910, from which both copies of the {alpha}0 gene had been deleted. The derivation of these viruses has been described elsewhere. After 24 h of infection, the cells were harvested and subjected to one of two procedures.

First procedure. In the first procedure, the infected cells were harvested, rinsed with phosphate-buffered solution, solubilized in a denaturing buffer, subjected to electrophoresis in denaturing polyacrylamide gels, transferred to a nitrocellulose sheet, and probed with antibodies to three viral proteins, ICP4 (the product of the {alpha}4 gene) and the products of UL38 and US11 genes. Whereas ICP4 is expressed immediately after infection, the products of the UL38 and US11 genes are made very late in infection and require the synthesis of viral DNA. The results of this series of experiments were as follows (Fig. 1 and 2). (i) As expected, the amounts of viral proteins detected in cells infected with 0.1 PFU/cell were generally significantly lower than those detected in lysates of cells infected at higher ratios of virus per cell. (ii) Only trace amounts of viral proteins were detected in IFN-treated cells compared to the amounts detected in mock-treated, infected cells. (iii) In contrast to the drastic effects of IFN on viral gene expression in PML+/+ cells, IFN had virtually no effect on viral gene expression in PML-/- cells infected with 10 PFU/cell and the mixture of IFN-{alpha} and IFN-{gamma} had only a slight effect on the accumulation of viral proteins in cells infected with 1 PFU/cell. We concluded that the suppressive effects of IFN require the presence of PML-infected cells in both the wild type and an ICP0 mutant ({Delta}{alpha}0 mutant).



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  		FIG. 1. Effects of IFN-{alpha} and IFN-{gamma} on the accumulation of viral proteins encoded by {alpha}4, UL38, and US11 open reading frames. (Top) Experimental design; (bottom) immunoblots of electrophoretically separated lysates of murine PML+/+ or PML-/- infected cells. At The University of Chicago, the PML-/- and PML+/+ cells were initially maintained in culture for approximately 20 serial passages and were then frozen. Prior to the initiation of these studies, the absence of PML from PML-/- cells was verified for both untreated and IFN-treated cells (data not shown). In all experiments, thawed cells were maintained in culture for less than 15 serial passages. HSV-1(F), an isolate that can be passaged a limited number of times, is the prototype HSV-1 strain used in this laboratory (6). The construction and phenotypic properties of the recombinant virus R7910, lacking both copies of the {alpha}0 gene, were described elsewhere (15). The cells were harvested 24 h after infection, rinsed with phosphate-buffered saline (PBS), resuspended in PBS* (PBS containing 1% NP-40, 1% deoxycholate, and the Roche complete protease inhibitor cocktail), lysed for 30 min in ice, and centrifuged at 11,000 x g for 15 min to remove the insoluble fraction. Protein concentrations were determined by the Bradford assay (Bio-Rad). Protein lysates (100 µg) were denatured by boiling them for 5 min in disruption buffer (2% sodium dodecyl sulfate, 50 mM Tris [pH 7.0], 2.75% sucrose, 5% ß-mercaptoethanol [final concentrations], and bromophenol blue), electrophoretically separated on a denaturing 12% polyacrylamide (acrylamide-DATD) gel, and transferred to nitrocellulose membranes. The nitrocellulose sheets were blocked for 1 h with 5% milk buffer, probed with the appropriate primary antibody for 2 h at room temperature or overnight at 4°C, rinsed, and then reacted with secondary antibodies conjugated with alkaline phosphatase (Bio-Rad) diluted 1:3,000 in PBS containing 0.05% Tween 20 and 1% bovine serum albumin for 1 h. The mouse monoclonal antibodies to ICP4 and US11 were reported elsewhere (1, 28) and were used at dilutions of 1:1,000 and 1:2,000, respectively. The polyclonal antibody to the UL38 protein (33) was used at a 1:500 dilution. Alkaline phosphatase-conjugated antibodies were detected in AP buffer (100 mM Tris [pH 9.5], 100 mM NaCl, and 5 mM MgCl2) containing 5-bromo-4-chloro-3-indolylphosphate and nitroblue tetrazolium.



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  		FIG. 2. The effects of IFN-{alpha} and IFN-{gamma} on the accumulation of viral proteins encoded by {alpha}4, UL38, and US11 open reading frames. (Top) Experimental design; (bottom) immunoblots of electrophoretically separated lysates of murine PML+/+ or PML-/- infected cells. The procedures were as described in the legend to Fig. 1.

Second procedure. In the second procedure, the cells harvested 24 h after infection were disrupted by sonication and the titers either in Vero cells (wild-type virus) or in U2-OS cells were determined. The results, shown in Table 1, were as follows. (i) HSV-1(F) replicated in PML-/- cells at least as well as (0.1 PFU/cell) or better than (1 PFU/cell) in PML+/+ cells. IFN-{alpha} and IFN-{gamma} were approximately equally effective in reducing viral yields in PML+/+ cells infected with 0.1 PFU/cell. The effects of IFN-{alpha} and IFN-{gamma} were significantly reduced (less than 10-fold) in PML-/- cells infected with 1.0 PFU/cell. In PML-/- cells infected with 0.1 PFU/cell, IFN-{alpha} reduced the yield by approximately 20-fold—significantly less than the reduction in virus yields obtained with IFN{alpha}-treated PML+/+ cells (100-fold). The mixture of IFN-{alpha} and IFN-{gamma} was more effective than the individual IFNs in reducing viral yields. In this instance as well, the effects of the mixture of IFNs were greater in PML+/+ than in PML-/- cells at the lower multiplicity of infection. (ii) The differential effects of IFNs in PML-/- and PML+/+ cells were more pronounced in cells infected with the recombinant virus R7910, from which both copies of the {alpha}0 gene had been deleted. Although the yields of R7910 were reduced relative to those of the wild-type parent, there was no significant difference between yields obtained from untreated PML-/- and those obtained from PML+/+ cells. In contrast, both IFN-{alpha} and IFN-{gamma} had a significantly more drastic effect on viral replication in PML+/+ than in PML-/- cells. While the reduction in virus yields from PML-/- cells treated with IFN-{alpha} or IFN-{gamma} and exposed to 0.1 PFU/cell was approximately 30- to 40-fold, the corresponding reduction in PML+/+ cells was approximately 10,000-fold. While viral yields from PML-/- cells infected with 1 PFU/cell and treated with IFN-{alpha} or IFN-{gamma} did not differ significantly from those of untreated cells, there was a 100-fold reduction in viral yields from infected PML+/+ cells. Again, as in the case of cells infected with wild-type virus, the combination of IFN-{alpha} and IFN-{gamma} was more effective in reducing virus yields in PML+/+ than in PML-/- cells, especially in cells infected at a multiplicity of infection of 0.1 PFU/cell.


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  		TABLE 1. Viral yields from PML+/+ or PML-/- cells mock treated or treated with IFN-{alpha} or IFN-{gamma}

PML mediates an antiviral response in the presence of IFNs. The results presented in this report lead to several conclusions. (i) We did not observe major differences between PML-/- and PML+/+ cells with respect to the accumulation of viral proteins or viral yields in the absence of IFNs. (ii) PML mediates to a large extent the ability of exogenous IFN-{alpha} or IFN-{gamma} to induce a host antiviral response in infected cells. This mediation is evident from analyses of both viral-protein accumulation in and viral yields from mock-infected and IFN-treated cells. (iii) The effects of IFN were less drastic at lower than at higher multiplicities of infection and more drastic in PML+/+ than in PML-/- cells. (iv) The effects of exogenously added IFNs, albeit very much reduced in PML-/- cells, suggest either that PML is not the sole mediator or that its role is indirect with respect to the induction of an antiviral state in HSV-1-infected cells.

The significance of the report presented here stems from several considerations. Several viruses, including HSV-1, induce the disaggregation of ND10 structures and the dissemination of PML (2, 3, 4). In HSV-1-infected cells, these functions are mediated by ICP0. As noted earlier in the text, a large number of seemingly unrelated functions have been attributed to PML or, possibly, to the ND10 structures to which PML is localized. While the evidence that HSV-1 targets ND10 structures is persuasive, the reason why the virus would target these structures is not. Since ectopically induced overexpression of PML had no effect on viral replication, the data suggested either that the destruction of ND10 was a consequence of a virus-induced activity against another cellular target or that the function of PML did not require excessive amounts of the protein. The test of the latter hypothesis, as described in this report, was based on the reports that, among other functions, PML mediates the effects of IFN and that cells lacking the {alpha}0 genes and hence that are unable to synthesize ICP0 are more sensitive to IFN than wild-type cells are.

The scenario that is emerging from these studies is that HSV-1 targets ND10 and PML concurrently to preclude the ability of the cell to respond to the presence of IFN, which would lead to the development of an antiviral response. This possibility is consistent with the report cited earlier that IFN induces the synthesis of mRNA and controls ND10 protein levels as well as the number and size of ND10 structures (8-10, 12, 17). In essence, the model that emerges from these studies is that the destruction of ND10 and the dispersal of PML are not critical in the absence of IFN. In the absence of IFN, the {Delta}{alpha}0 mutant multiplied in PML-/- cells as well or as poorly (depending on cell type) as in PML+/+ cells. In the presence of IFN, the failure to disperse PML and disaggregate the ND10 structures results in a drastic effect on viral replication. Our studies also indicated that overexpression of PML had no effect because the cells already contained the full complement of PML required to effect an antiviral response if IFN were present.

In the studies presented here, we have noted that the mixture of IFN-{alpha} and IFN-{gamma} has a more profound effect than either of the IFNs alone, even in PML-/- cells. This observation suggests at least two possibilities. The first is that the anti-HSV state is induced by different pathways by IFN-{alpha} and IFN-{gamma} and that both pathways must be induced to overcome the virus. In this scenario, each pathway is mediated by PML and differentially affected by the expression of ICP0. The alternative, nonexclusive hypothesis is that PML acts to facilitate the induction by IFN of the antiviral state but is not the effector of the IFN signal transduction pathways and that, therefore, the low-level activity of exogenous IFNs may be additive.


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ACKNOWLEDGMENTS
 
These studies were aided by grants from the National Cancer Institute of the U.S. Public Health Service to The University of Chicago (grants CA87661, CA83939, CA71933, CA78766, and CA88860) and to Sloan-Kettering Cancer Center (grant CA71692).


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FOOTNOTES
 
* Corresponding author. Mailing address: The Marjorie B. Kovler Viral Oncology Laboratories, The University of Chicago, 910 E. 58th St., Chicago, IL 60637. Phone: (773) 702-1898. Fax: (773) 702-1631. E-mail: bernard{at}delphi.bsd.uchicago.edu. Back


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Journal of Virology, June 2003, p. 7101-7105, Vol. 77, No. 12
0022-538X/03/$08.00+0     DOI: 10.1128/JVI.77.12.7101-7105.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.



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