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Ribonuclease 5 (RNase5) surprisingly suppresses early intestinal tumor initiation by limiting cell proliferation. Lower serum RNase5 levels correlate with colorectal cancer risk, suggesting a protective role.

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Area of Science:

  • Oncology
  • Molecular Biology
  • Gastroenterology

Background:

  • Ribonuclease 5 (RNase5), or angiogenin, is typically associated with promoting tumor growth.
  • Its established roles include enhancing angiogenesis, proliferation, migration, and invasion in cancer.

Purpose of the Study:

  • To investigate the role of RNase5 in the early stages of intestinal tumorigenesis.
  • To determine if RNase5 has a different function in tumor initiation compared to established tumors.

Main Methods:

  • Dose-dependent administration of RNase5 and RNase5-generated tRNA fragments (tiRNAs) in an early tumorigenesis model.
  • Analysis of intestinal cell proliferation and adenoma formation.
  • Nested case-control studies correlating serum RNase5 levels with colorectal cancer (CRC) development.

Main Results:

  • RNase5 demonstrated a dose-dependent suppressive effect on intestinal tumor initiation.
  • Cytoplasmic RNase5 restricted global protein synthesis via tiRNAs, maintaining intestinal homeostasis and restraining hyperproliferation.
  • Exogenous RNase5 or tiRNAs reduced adenoma number and size.
  • Baseline serum RNase5 levels were inversely correlated with CRC development.

Conclusions:

  • RNase5 acts as a crucial suppressor of early intestinal tumorigenesis, contrary to its pro-tumorigenic roles in established cancers.
  • RNase5-mediated restriction of protein synthesis and cell proliferation is a key mechanism in preventing malignant transformation.
  • RNase5 and its tiRNAs represent potential therapeutic targets for colorectal cancer prevention.