Abstract:
:Herpes simplex virus type 1 (HSV-1) reactivates from a small fraction of latently infected neurons in vivo and neuronally differentiated (ND), quiescently infected (QIF)-PC12 cells in vitro. This may be the result of reactivation initiating in only a few cells, or reactivation followed by premature termination of the productive virus life cycle in many or even a majority of cells. To examine the viral stress response, HSV-1 promoters of representative alpha, beta, and gamma class genes were examined in ND- and QIF-PC12 cells after treatments with agents known to induce reactivation. HSV-1 promoters displayed variable levels of basal gene expression in ND-PC12 cells ranging from 2 to 1,200 times the level of the control vector pGL3-Basic. Expression of the latency associated transcript (LAT) was greatest, with representatives of the alpha class exhibiting greater expression than the beta and gamma classes. The HSV-1 promoters examined did not respond dramatically to stress treatments. The viral gene response was also measured during the initiation of reactivation of a cryptic HSV-1 genome after forskolin treatment, under conditions that restricted DNA replication. During the first 24 h after stress induction the response was limited. By 48 h post-forskolin treatment, only modest increases occurred for ICP0, ICP4, and LAT transcripts, reaching levels of no greater than 2.2 times mock treated levels. In contrast, ICP27, ribonucleotide reductase (RR), and VP16 promoters did not respond. These findings indicate that reactivation from QIF-PC12 cells does not result in a global response of the specific HSV-1 genes tested, when assessed at the population level. These data support the hypothesis that stress-induced reactivation initiates in a minority of cells.
journal_name
Virus Genesjournal_title
Virus genesauthors
Danaher RJ,Jacob RJ,Miller CSdoi
10.1007/s11262-005-0052-6subject
Has Abstractpub_date
2006-10-01 00:00:00pages
163-7issue
2eissn
0920-8569issn
1572-994Xjournal_volume
33pub_type
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