Human papillomavirus type 38 alters wild-type p53 activity to promote cellproliferation via the downregulation of integrin alpha 1 expression.

Romero-Medina, MC and Venuti, A and Melita, G and Robitaille, A andCeraolo, MG and Pacini, L and Sirand, C and Viarisio, D and Taverniti, Vand Gupta, P and Scalise, M and Indiveri, C and Accardi, R and Tommasino, M

Tumor suppressors can exert pro-proliferation functions in specific contexts. In the beta human papillomavirus type 38 (HPV38) experimental model, the viral proteins E6 and E7 promote accumulation of a wild-type (WT) p53 form in human keratinocytes (HKs), promoting cellular proliferation. Inactivation of p53 by different means strongly decreases the proliferation of HPV38 E6/E7 HKs. This p53 form is phosphorylated at S392 by the double-stranded RNA-dependent protein kinase PKR, which is highly activated by HPV38. PKR-mediated S392 p53 phosphorylation promotes the formation of a p53/DNMT1 complex, which inhibits expression of integrin alpha 1 (ITGA1), a repressor of epidermal growth factor receptor (EGFR) signaling. Ectopic expression of ITGA1 in HPV38 E6/E7 HKs promotes EGFR degradation, inhibition of cellular proliferation, and cellular death. Itga1 expression was also inhibited in the skin of HPV38 transgenic mice that have an elevated susceptibility to UV-induced skin carcinogenesis. In summary, these findings reveal the existence of a specific WT p53 form that displays pro-proliferation properties.

Chromatin Shearing
IP-Star Compact
iDeal ChIP-seq Kit for Histones

Share this article

August, 2020


Products used in this publication

  • chip kit icon
    Chromatin EasyShear Kit – Ultra Low SDS
  • ChIP kit icon
    Auto iDeal ChIP-seq kit for Histones


 See all events


 See all news

The European Regional Development Fund and Wallonia are investing in your future.

Extension of industrial buildings and new laboratories.

       Site map   |   Contact us   |   Conditions of sales   |   Conditions of purchase   |   Privacy policy   |   Diagenode Diagnostics