TY - JOUR
T1 - Activation of the virus-induced IKK/NF-κB signalling axis is critical for the replication of human cytomegalovirus in quiescent cells
AU - Caposio, Patrizia
AU - Luganini, Anna
AU - Hahn, Gabriele
AU - Landolfo, Santo
AU - Gribaudo, Giorgio
PY - 2007/8
Y1 - 2007/8
N2 - Activation of the IKK/NF-κB signalling pathway is a hallmark of human cytomegalovirus (HCMV) infection. However, its role in regulating major immediate-early promoter (MIEP)-dependent transcription and HCMV replication remains controversial. This study uses a combination of genetic approaches to investigate the effects of cell culture conditions on the importance of virus-induced NF-κB activation during the infection of endothelial cells or fibroblasts. Adenoviral-mediated expression of a dominant-negative mutant of IKK2 kinase (dnIKK2) in human umbilical vein endothelial cells resulted in a strong reduction of IκBα degradation and NF-κB activation following infection with an HCMV clinical isolate. Viral replication was impaired in dnIKK2-expressing cells that were growth-arrested before infection, but not in replicating cells. The inhibitory effect of dnIKK2 was independent from the virus strain and the cell type used, because replication of the laboratory AD169 strain was impaired as well in dnIKK2-expressing quiescent fibroblasts. Moreover, progressive disruption of NF-κB response elements within the MIEP in recombinant HCMV viruses derived from the clinical isolate prevented their replication in quiescent cells but not in actively growing cells. These results demonstrate an essential role of virus-induced IKK/NF-κB activity to trigger both viral IE gene expression and productive replication in quiescent cells.
AB - Activation of the IKK/NF-κB signalling pathway is a hallmark of human cytomegalovirus (HCMV) infection. However, its role in regulating major immediate-early promoter (MIEP)-dependent transcription and HCMV replication remains controversial. This study uses a combination of genetic approaches to investigate the effects of cell culture conditions on the importance of virus-induced NF-κB activation during the infection of endothelial cells or fibroblasts. Adenoviral-mediated expression of a dominant-negative mutant of IKK2 kinase (dnIKK2) in human umbilical vein endothelial cells resulted in a strong reduction of IκBα degradation and NF-κB activation following infection with an HCMV clinical isolate. Viral replication was impaired in dnIKK2-expressing cells that were growth-arrested before infection, but not in replicating cells. The inhibitory effect of dnIKK2 was independent from the virus strain and the cell type used, because replication of the laboratory AD169 strain was impaired as well in dnIKK2-expressing quiescent fibroblasts. Moreover, progressive disruption of NF-κB response elements within the MIEP in recombinant HCMV viruses derived from the clinical isolate prevented their replication in quiescent cells but not in actively growing cells. These results demonstrate an essential role of virus-induced IKK/NF-κB activity to trigger both viral IE gene expression and productive replication in quiescent cells.
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U2 - 10.1111/j.1462-5822.2007.00936.x
DO - 10.1111/j.1462-5822.2007.00936.x
M3 - Article
C2 - 17419715
AN - SCOPUS:34447639967
SN - 1462-5814
VL - 9
SP - 2040
EP - 2054
JO - Cellular Microbiology
JF - Cellular Microbiology
IS - 8
ER -