Sign in Subscribe
Scientists

Novel Regulatory Mechanism in Chronic Lymphocytic Leukemia Revealed

Strategic Insights

— 1 min read

A study by D. Sampath and colleagues at the University of Texas has identified a novel regulatory mechanism in chronic lymphocytic leukemia (CLL) cells. The researchers found that deacetylase inhibition leads to the activation of the microRNA miR106b, which targets the ubiquitin ligase Itch for degradation. This event results in the accumulation of the proapoptotic substrate p73, leading to apoptosis of CLL cells. The study highlights the potential of chemotherapeutic drugs that activate miR106b to target CLL cells through a p53-independent mechanism.

Key Takeaways:

  • Deacetylase inhibition leads to the activation of the microRNA miR106b in primary CLL cells, resulting in the down-regulation of the E3-ubiquitin ligase Itch.
  • Itch is a direct target of miR106b, and decreases in Itch levels lead to the accumulation of the proapoptotic substrate p73.
  • The induction of p73 is associated with mitochondrial dysfunction, processing of caspase-9, and apoptosis of CLL cells.
  • Silencing of miRNA expression in CLL may selectively suppress proapoptotic pathways, providing tumors with a survival advantage.
  • The study suggests that chemotherapeutic drugs that activate miR106b could initiate a p53-independent mechanism that targets CLL cells.
  • The research has implications for the development of novel therapeutic strategies for CLL, a common type of blood cancer.
  • The study was published in the journal Blood, a leading hematology research publication.

Statistics:

  • 3744-3753 (page numbers of the study in Blood)
  • 2009 (year of publication of the study)
  • 113 (volume number of the journal Blood where the study was published)
  • 16 (issue number of the journal Blood where the study was published)
  • 5 (number of researchers involved in the study, including D. Sampath)
  • 71 (Box number at the University of Texas MD Anderson Cancer Center where D. Sampath can be contacted)
  • 1515 (Holcombe Boulevard, Houston, TX, where the University of Texas MD Anderson Cancer Center is located)
  • 77030 (zip code of the University of Texas MD Anderson Cancer Center)
  • 1900 (M Street NW, Suite 200, Washington, DC, where the American Society of Hematology is located)
  • 20036 (zip code of the American Society of Hematology)

Sources:

  • Blood. 2009; 113(16): 3744-3753. "Specific activation of microRNA106b enables the p73 apoptotic response in chronic lymphocytic leukemia by targeting the ubiquitin ligase Itch for degradation."
  • University of Texas MD Anderson Cancer Center, Dept. of Experimental Therapeutic, Box 71, 1515 Holcombe Blvd., Houston, TX 77030, USA. Contact: D. Sampath.
  • American Society Hematology, 1900 M Street NW Suite 200, Washington, DC 20036, USA.

Read more