Abstract:
:Human papillomaviruses (HPV) are the known cause for a variety of cancers including cervical and epithelial cancers. The cottontail-rabbit papillomavirus (CRPV) serves as a suitable animal model to study the development of these cancers in vivo. We have previously demonstrated that CRPV-induced skin carcinomas express high levels of MMP-9, a metalloproteinase contributing to cancer progression by extracellular matrix remodelling. Based on our previously reported finding that CRPV early protein 2 can activate a truncated human 670bp MMP-9 promoter fragment, we hypothesized that MMP-9 expression in the rabbit carcinomas is a consequence of activation of the rabbit MMP-9 promoter in-trans by CRPV early protein 2. Further elucidation of the mechanism revealed the requirement for both a proximal and distal AP-1 transcription factor binding site in the rabbit MMP-9 promoter and the AP-1 complex as demonstrated by the inhibitory effect of TAM67, a trans-activation deficient c-jun mutant. The characterization of signal-transduction requirements revealed predominantly ERK1 to be required for CRPV early protein 2-dependent MMP-9 promoter activation, but not JNK nor p38. In summary CRPV early protein 2 activates the expression of MMP-9 in-trans through AP-1 and ERK1 and may contribute to cancer development and progression via this mechanism within the animal model.
journal_name
Virus Resjournal_title
Virus researchauthors
Mühlen S,Behren A,Iftner T,Plinkert PK,Simon Cdoi
10.1016/j.virusres.2008.09.007subject
Has Abstractpub_date
2009-01-01 00:00:00pages
100-5issue
1eissn
0168-1702issn
1872-7492pii
S0168-1702(08)00327-4journal_volume
139pub_type
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