PMID:16873257

Citation	Tavalai, N, Papior, P, Rechter, S, Leis, M and Stamminger, T (2006) Evidence for a role of the cellular ND10 protein PML in mediating intrinsic immunity against human cytomegalovirus infections. J. Virol. 80:8006-18
Abstract	Several viruses, including human cytomegalovirus (HCMV), encode proteins that colocalize with a cellular subnuclear structure known as ND10. Since only viral DNA deposited at ND10 initiates transcription, ND10 structures were hypothesized to be essential for viral replication. On the other hand, interferon treatment induces an up-regulation of ND10 structures and viruses have evolved polypeptides that disperse the dot-like accumulation of ND10 proteins, suggesting that ND10 could also be part of an intrinsic defense mechanism. In order to obtain evidence for either a proviral or an antiviral function of ND10, we generated primary human fibroblasts with a stable, short interfering RNA-mediated knockdown (kd) of PML. In these cells, other ND10-associated proteins like hDaxx showed a diffuse nuclear distribution. Interestingly, we observed that HCMV infection induced the de novo formation of ND10-like hDaxx and Sp100 accumulations that colocalized with IE2 and were disrupted, in the apparent absence of PML, in an IE1-dependent manner during the first hours after infection. Furthermore, infection of PML-kd cells with wild-type HCMV at a low multiplicity of infection resulted in enhanced replication. In particular, a significantly increased plaque formation was detected, suggesting that more cells are able to support initiation of replication in the absence of PML. While there was no difference in viral DNA uptake between PML-kd and control cells, we observed a considerable increase in the number of immediate-early (IE) protein-positive cells, indicating that the depletion of PML augments the initiation of viral IE gene expression. These results strongly suggest that PML functions as part of an intrinsic immune mechanism against cytomegalovirus infections.
Links	PubMed PMC1563799 Online version:10.1128/JVI.00743-06
Keywords	Adaptor Proteins, Signal Transducing/analysis; Adaptor Proteins, Signal Transducing/metabolism; Antigens, Nuclear/analysis; Antigens, Nuclear/metabolism; Autoantigens/analysis; Autoantigens/metabolism; Cell Nucleus/chemistry; Cell Nucleus/metabolism; Cell Nucleus/virology; Cytomegalovirus/physiology; Cytomegalovirus Infections/immunology; Cytomegalovirus Infections/metabolism; Fibroblasts/chemistry; Fibroblasts/metabolism; Fibroblasts/virology; Gene Expression Regulation, Viral; Humans; Immediate-Early Proteins/genetics; Immediate-Early Proteins/metabolism; Neoplasm Proteins/antagonists & inhibitors; Neoplasm Proteins/genetics; Neoplasm Proteins/metabolism; Nuclear Proteins/analysis; Nuclear Proteins/antagonists & inhibitors; Nuclear Proteins/genetics; Nuclear Proteins/metabolism; Trans-Activators/genetics; Trans-Activators/metabolism; Transcription Factors/antagonists & inhibitors; Transcription Factors/genetics; Transcription Factors/metabolism; Tumor Suppressor Proteins/antagonists & inhibitors; Tumor Suppressor Proteins/genetics; Tumor Suppressor Proteins/metabolism; Viral Proteins/genetics; Viral Proteins/metabolism; Virus Replication/genetics
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Annotations

Gene product	Qualifier	GO Term	Evidence Code	with/from	Aspect	Extension	Notes	Status
HUMAN:PML	involved_in	GO:0002230: positive regulation of defense response to virus by host	ECO:0000315: mutant phenotype evidence used in manual assertion		P		Seeded From UniProt	complete

References

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