Inhibition of TGF-β and NOTCH Signaling by Cutaneous Papillomaviruses

Jordan M Meyers1,2, Miranda Grace2, Aayushi Uberoi3

  • 1Program in Virology, Harvard Medical School, Boston, MA, United States.

Insights

Mouse models of cutaneous human papillomavirus (HPV) infection reveal that MmuPV1 E6 protein inhibits key signaling pathways, driving wart and cancer development. This finding establishes a valuable system for studying HPV pathogenesis and carcinogenesis.

Area of Science:

  • Virology
  • Dermatology
  • Oncology

Background:

  • Cutaneous human papillomaviruses (HPVs) are associated with skin cancers, particularly in individuals with genetic disorders like epidermodysplasia verruciformis or those with long-term immunosuppression.
  • The E6 proteins of certain cutaneous HPVs, such as HPV5 and HPV8, are known to interfere with critical cellular signaling pathways, including TGF-β and NOTCH.
  • Cutaneous squamous cell carcinomas (cSCCs) represent a significant health concern, with HPV infections being a recognized risk factor in specific patient populations.

Purpose of the Study:

  • To investigate the role of Mus musculus papillomavirus 1 (MmuPV1) E6 protein in cutaneous carcinogenesis.
  • To determine if MmuPV1 E6 shares functional similarities with oncogenic HPV E6 proteins, specifically regarding TGF-β and NOTCH signaling inhibition.
  • To establish and validate the MmuPV1 mouse model as a system for studying cutaneous HPV pathogenesis and cancer development.

Main Methods:

  • Experimental infection of laboratory mice with MmuPV1.
  • Biochemical assays to assess MmuPV1 E6 binding to SMAD2/SMAD3 and MAML1 transcription factors.
  • Analysis of keratinocyte differentiation and proliferation in infected tissues.
  • Evaluation of wart and squamous cell carcinoma formation in MmuPV1-infected mice.

Main Results:

  • MmuPV1 E6 protein inhibits both TGF-β and NOTCH signaling pathways, similar to HPV8 E6.
  • Inhibition of these pathways by MmuPV1 E6 leads to delayed keratinocyte differentiation and sustained proliferation.
  • MmuPV1 E6 binding to MAML1 is essential for the development of warts and subsequent carcinogenesis in experimentally infected mice.
  • MmuPV1 infection in mice recapitulates key aspects of cutaneous HPV pathogenesis.

Conclusions:

  • The MmuPV1 E6 protein plays a critical role in promoting skin warts and squamous cell carcinomas by disrupting TGF-β and NOTCH signaling.
  • The MmuPV1 mouse model provides a robust platform for dissecting the molecular mechanisms underlying cutaneous HPV infection, pathogenesis, and carcinogenesis.
  • Understanding the function of MmuPV1 E6 offers insights into the broader field of HPV-driven skin cancer development.

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