Compensation between Wnt-driven tumorigenesis and cellular responses to ribosome biogenesis inhibition in the murine...

Area of Science:

• Molecular Biology
• Cell Biology
• Oncology

Background:

• Ribosome biogenesis is crucial for cell growth and proliferation.
• Inhibition of ribosome synthesis triggers cell cycle arrest and apoptosis via surveillance pathways.
• Cancer cells often exhibit heightened sensitivity to ribosome biogenesis defects.

Purpose of the Study:

• To investigate the impact of Notchless (Nle) loss-of-function on intestinal tumor initiation.
• To determine how ribosome biogenesis dysfunction affects Wnt-driven tumorigenesis in the intestinal epithelium.
• To evaluate the therapeutic potential of targeting ribosome synthesis in Wnt-dependent cancers.

Main Methods:

• Utilized a mouse model with acute Apc loss-of-function to study intestinal tumor initiation.
• Characterized the role of Notchless (Nle) in ribosome biogenesis.
• Assessed cell cycle progression, differentiation, and apoptosis in response to ribosome biogenesis defects and Wnt hyperactivation.

Main Results:

• Loss of Nle, an essential ribosome biogenesis factor, significantly suppressed Wnt-driven intestinal tumor initiation.
• Ribosome biogenesis dysfunction restored cell cycle exit and differentiation in Apc-deficient progenitor cells.
• Wnt hyperactivation counteracted the anti-proliferative effects of ribosome biogenesis inhibition, maintaining proliferation in stem and progenitor cells.

Conclusions:

• Targeting ribosome biogenesis is a promising strategy to reduce cancer cell proliferation in the intestinal epithelium.
• Apc-deficient stem and progenitor cells exhibit resistance to ribosome biogenesis defects, potentially limiting therapeutic efficacy in Wnt-dependent tumorigenesis.
• Further research is needed to overcome resistance mechanisms for effective Wnt-dependent cancer treatment.