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Cytological research

Activating Transcription Factor 3 Plays Key Role in Defense Against HPV-Induced Carcinogenesis

Strategic Insights

— 1 min read

A recently published study has found that activating transcription factor 3 (ATF3) plays a crucial role in a mechanism defending against human papillomavirus (HPV)-induced carcinogenesis. The research, conducted by H. Wang and colleagues at the Albany Medical College, Center for Cell Biology and Cancer Research, revealed that ATF3 interacts with the viral protein E6, preventing it from binding to E6-associated protein (E6AP) and thereby preventing the degradation of the tumor suppressor p53.

Key Takeaways:

  • ATF3 interacts with the viral protein E6 and prevents it from binding to E6-associated protein (E6AP), thereby preventing the degradation of p53.
  • The leucine zipper domain of ATF3 is indispensable for this effect, as a mutant lacking this domain failed to interact with E6 and activate p53.
  • ATF3 expressed enforcedly in HPV-positive SiHa cells activated p53, leading to the expression of p53-target genes such as p21 and PUMA, cell cycle arrest, and apoptotic cell death.
  • The researchers concluded that ATF3 plays a key role in a mechanism defending against HPV-induced carcinogenesis and could serve as a novel therapeutic target for HPV-positive cancers.
  • The study suggests that ATF3 may be a potential therapeutic target for the treatment of cervical cancer, which is caused by high-risk HPVs.
  • The researchers also found that the prevention of p53 degradation was unlikely caused by binding of ATF3 to the tumor suppressor, but rather was a consequence of disruption of the E6-E6AP interaction by ATF3.

Statistics:

  • More than 90% of cervical cancers are caused by genomic integration of human papillomavirus (HPV) DNA (Source: [1])
  • HPV-positive cervical cancer cells are euthanized by enforced ATF3 expression, leading to cell cycle arrest, apoptosis, and activation of p53 (Source: [2])
  • ATF3 expressed enforcedly in HPV-positive SiHa cells activated p53, leading to the expression of p53-target genes such as p21 and PUMA (Source: [2])
  • The leucine zipper domain of ATF3 is indispensable for its effect in preventing p53 degradation (Source: [2])

Sources:

  • H. Wang et al. Activating transcription factor 3 activates p53 by preventing E6-associated protein from binding to E6. Journal of Biological Chemistry, 2010;285(17):13201-10
  • Human Papillomavirus
  • Cancer Weekly via NewsRx.com (2010)

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