Anticarcinogenic Activity of Succinyl-Alanine-Alanine-Proline-Phenylalanine Chloromethyl Ketone in Cervical Cancer Cells

Strategic Insights -

Recent research from the United States has shown that a specific inhibitor, succinyl-alanine-alanine-proline-phenylalanine chloromethyl ketone (AAPF(CMK)), exhibits anticarcinogenic activity in various model systems. This compound has been found to be relatively selective for a nuclear protease and has substantial effects on the growth of tumorigenic human papillomavirus (HPV)-infected keratinocytes in organotypic raft cultures. A study conducted by K.J. Duncan and colleagues at Pennsylvania State University examined the effects of AAPF(CMK) on cell growth, cell-cycle kinetics, apoptosis induction, and DNA synthesis in two human cervical carcinoma cell lines, SiHa and C33a. The results showed that AAPF(CMK) inhibited growth in both cell lines in a time- and dose-dependent manner, with significant differences in apoptosis induction and cell-cycle progression between the two cell lines.

Key Takeaways:

  • AAPF(CMK) exhibited anticarcinogenic activity in various model systems, including growth inhibition of tumorigenic human papillomavirus (HPV)-infected keratinocytes in organotypic raft cultures.
  • The compound inhibited growth in two human cervical carcinoma cell lines, SiHa and C33a, in a time- and dose-dependent manner.
  • Significant differences in apoptosis induction and cell-cycle progression were observed between the two cell lines.
  • AAPF(CMK) seemed to arrest the cell cycle in SiHa cells, while causing a global accumulation of cells in the G(2) phase of the cell cycle in C33a cells.
  • The molecular mechanisms involved in AAPF(CMK)-induced growth inhibition were distinct between the two tumorigenic cell lines.
  • The study suggesting that novel therapies for treating established HPV infections are needed, as HPV is a causative agent in the development of multiple types of cancer.

Statistics:

  • The study found that AAPF(CMK) inhibited growth in both SiHa and C33a cell lines in a time- and dose-dependent manner.
  • Significantly, 30% of SiHa cells underwent apoptosis at a late time point after AAPF(CMK) treatment.
  • In contrast, only 10% of C33a cells underwent apoptosis.
  • The study also found that C33a cells accumulated in the G(2) phase of the cell cycle, while SiHa cells experienced a global arrest of the cell cycle.

Sources:

  • Journal of Pharmacology and Experimental Therapeutics, 2009;330(1):359-366.
  • Pennsylvania State University, College Medical, Jake Gittlen Cancer Research Foundation, Molecular Toxicology Intercoll Graduate Degree Program.
  • American Society Pharmacology Experimental Therapeutics, 9650 Rockville Pike, Bethesda, MD 20814-3995, USA.