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Viruses have evolved many distinct strategies to avoid the host's apoptotic response. Here we describe a new family of viral inhibitors (v-FLIPs) which interfere with apoptosis signalled through death receptors and which are present in several gamma-herpesviruses (including Kaposi's-sarcoma-associated human herpesvirus-8), as well as in the tumorigenic(More)
The major immediate early enhancer of human cytomegalovirus (HCMV) is known to exert a strong constitutive transcription stimulation in a broad spectrum of cells. This basal activity can be augmented considerably by elevated levels of intracellular cAMP in a cell type-specific manner. Cyclic AMP induction was observed in several lymphoid cell lines and in(More)
Although herpesvirus saimiri-transformed T lymphocytes retain multiple normal T-cell functions, only a few changes have been described. By subtractive hybridization, we have isolated a novel cellular gene, ak155, a sequence homolog of the interleukin-10 gene. Specifically herpesvirus saimiri-transformed T cells overexpress ak155 and secrete the protein into(More)
Subgroup C strains of Herpesvirus saimiri, a leukemogenic virus of non-human primates, transform human T cells to permanent growth in culture. These cell retain their antigen specificity, and they are becoming widely used as a model for activated human T cells. Though a variety of human cell types can be infected by H. saimiri, transformation appears to be(More)
Eruptive pseudoangiomatosis is a distinct exanthem thought to be caused by viruses. The usual rash configu-ration is erythematous papules and macules. An association with echovirus infection has been reported. We present here one adult and one child with this exanthem, supported by clinical, histopathological, and immunohistochemical findings. Both patients(More)
Viruses have evolved different strategies to interfere with host cell apoptosis. Herpesvirus saimiri (HVS) and other lymphotropic herpesviruses code for proteins that are homologous to the cellular antiapoptotic Bcl-2. In this study HVS-Bcl-2 was stably expressed in the human leukemia cell line Jurkat and in the murine T-cell hybridoma DO to assess its(More)
T blasts of six established human CD4+ T cell clones with defined Ag specificity and cytokine secretion profile (3 Th1 and 3 Th2) were immortalized with Herpesvirus saimiri (HVS) and compared with their uninfected counterparts for their ability to proliferate, produce cytokines, and express cytolytic activity. HVS-transformed Th1 and Th2 clones neither(More)
Induction of apoptosis of virus-infected cells is an important host cell defence mechanism. However, some viruses have incorporated genes that encode anti-apoptotic proteins or modulate the expression of cellular regulators of apoptosis. Here, Edgar Meinl and colleagues discuss recent evidence that viral interference with host cell apoptosis leads to(More)
Herpesvirus saimiri (HVS) transforms human T cells to stable growth in vitro. Since HVS codes for two different antiapoptotic proteins, growth transformation by HVS might be expected to confer resistance to apoptosis. We found that the expression of both viral antiapoptotic genes was restricted to cultures with viral replication and absent in(More)
The major enhancer, extending from nucleotides -530 to -120 upstream of the transcription initiation site of immediate early (IE) genes 1 and 2 in human cytomegalovirus (HCMV), contains four groups of repeated sequence motifs that consist of 17, 18, 19 or 21 bp, respectively. One of these elements, the 19 bp repeat, is a symmetrical palindrome that is also(More)