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  • 1
    Language: English
    In: Trends in Molecular Medicine, 2004, Vol.10(1), pp.19-23
    Description: Recently, the term oncomodulation has been proposed to express the ability of human cytomegalovirus (HCMV) to modify tumor cell biology, a phenomenon that is independent from transformation. Because past studies have failed to show that HCMV can transform normal human cells, HCMV has not been regarded as an oncogenic tumor virus. However, recent investigations have revealed a high frequency of HCMV in tumor cells of malignancies such as colon cancer, malignant glioma, prostatic intraepithelial neoplasia, and carcinoma. Data from experiments with HCMV-infected tumor cell lines have highlighted the oncomodulatory potential of HCMV and provided important insights into the patho- mechanisms associated with aberrant signaling pathways and transcription factor and/or tumor suppressor function of the host cell.
    Keywords: Medicine ; Biology
    ISSN: 1471-4914
    E-ISSN: 1471-499X
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  • 2
    Language: English
    In: Medical Microbiology and Immunology, 2004, Vol.193(4), pp.195-203
    Description: Human cytomegalovirus (HCMV) retinitis causing retinal detachment and destruction of the blood-retina barrier is closely related to retinal hemorrhage/coagulation. However, the effects of procoagulants on HCMV (re)activation in retinal cells have not been investigated yet. Therefore, we studied whether thrombin modulates the expression of HCMV immediate early (IE) and late (L) genes in cultured human retinal pigment epithelial cells (RPE). Thrombin specifically stimulated the protease-activated receptor-1 (PAR-1) on RPE and, surprisingly, inhibited basal and 12,0-tetradecanoylphorbol 13-acetate-stimulated HCMV IE gene expression in infected RPE. On the other hand, HCMV strongly induced Sp1 DNA binding activity, which was prevented by thrombin/PAR1-mediated Sp1 hyperphosphorylation. Our data suggest that thrombin/PAR-1 may inhibit Sp1-dependent HCMV replication, which might be an important regulatory mechanism for HCMV persistence and replication in RPE.
    Keywords: Human cytomegalovirus ; Infectious immunity virus ; Retina ; Signal transduction ; Transcription factors
    ISSN: 0300-8584
    E-ISSN: 1432-1831
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