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Journal Article

Infection of primary cells by adeno-associated virus type 2 results in a modulation of cell cycle-regulating proteins.

J Hermanns, A Schulze, P Jansen-Db1urr, J A Kleinschmidt, R Schmidt, H zur Hausen
J Hermanns
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A Schulze
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P Jansen-Db1urr
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J A Kleinschmidt
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R Schmidt
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H zur Hausen
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ABSTRACT

It has been demonstrated that infection of primary human cells with adeno-associated viruses (AAV) leads to a decrease in cellular proliferation and to growth arrest. We analyzed the molecular basis of this phenomenon and observed that infection with AAV type 2 (AAV2) had an effect on several factors engaged in the control of the mammalian cell cycle. In particular, all of the pRB family members, pRB, p107, and p130, which are involved in G1 cell cycle checkpoint control, were affected. After infection, a shift from hyper- to hypophosphorylated forms was observed. Cyclins A and B1, which are required for G1/S transition and progression into mitosis, respectively, were downregulated at the transcriptional level as well as at the protein level, whereas the G1 cyclins D1 and E remained unaffected. In addition, the steady-state levels of cyclin-dependent kinases CDK1 and CDK2 and of transcription factor E2F-1 were diminished. Of all the factors known to be involved in phosphorylation of pRB family proteins, only the CDK inhibitor p21WAF1 exhibited a response to AAV2 infection. p21WAF1 mRNA was quickly and progressively upregulated in a p53-independent manner over at least 72 h. Consistent with the increased p21WAF1 protein levels, cyclin E- and cyclin A-dependent kinase activities declined to low levels and E2F-p130-cyclin-CDK2 complexes were disrupted. From these data, we conclude that the major effect of AAV2 infection on primary human fibroblasts appears to be upregulation of p21WAF1 gene expression and thus cell cycle arrest by the suppression of pRB family protein phosphorylation.

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Infection of primary cells by adeno-associated virus type 2 results in a modulation of cell cycle-regulating proteins.
J Hermanns, A Schulze, P Jansen-Db1urr, J A Kleinschmidt, R Schmidt, H zur Hausen
Journal of Virology Aug 1997, 71 (8) 6020-6027; DOI:

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Infection of primary cells by adeno-associated virus type 2 results in a modulation of cell cycle-regulating proteins.
J Hermanns, A Schulze, P Jansen-Db1urr, J A Kleinschmidt, R Schmidt, H zur Hausen
Journal of Virology Aug 1997, 71 (8) 6020-6027; DOI:
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