Skip to main content
padlock icon - secure page this page is secure

Regulation of dihydropyrimidine dehydrogenase gene expression in regenerating mouse liver

Buy Article:

$42.00 + tax (Refund Policy)

5-fluorouracil (5-FU) is one of the most commonly used agents in treatment of the cancer. The administered 5-FU is degraded mainly in the liver by dihydropyrimidine dehydrogenase (DPD), which is the initial rate-limiting enzyme in the catabolic pathway of pyrimidine. This enzyme activity in the tumors has been shown to correlate with the effectiveness of 5-FU against tumors. Therefore, to understand the regulation of DPD gene expression is critical in cancer chemotherapy. Since several studies suggested correlation of DPD activity with the cell proliferation rate we studied the DPD gene expression during liver regeneration. DPD enzyme activity decreased rapidly [24 h after partial hepatectomy (PH): 57% of the control] and remained low until 72 h after PH. Protein content also decreased after PH, however, the lowest level (43.2±6.3% of control) was reached only 48 h after PH. The DPD mRNA decreased rapidly to about 20% of control 24 h after PH and then recovered to the control level 72 h after PH. The present results indicate that the DPD gene expression is regulated first at the mRNA level when the hepatocytes enter the cell cycle. The protein content of DPD changed in proportion to the level of DPD mRNA with a 24-h lag, suggesting very little regulation at the translational level. There was a discrepancy between the DPD enzyme activity and the protein content, 24 and 72 h after PH, suggesting that the enzyme activity is modulated also by modification of the protein, and the cell proliferation rate is one of the factors that influences the modification.
No Reference information available - sign in for access.
No Citation information available - sign in for access.
No Supplementary Data.
No Article Media
No Metrics

Document Type: Research Article

Affiliations: Laboratory of Neural Information, National Institute for Physiological Sciences, Okazaki National Research Institutes, Okazaki 444-8585, Japan

Publication date: February 1, 2003

More about this publication?
  • The International Journal of Oncology provides an international forum for the publication of the latest, cutting-edge research in the broad area of oncology and cancer treatment. The journal accepts original high quality works and reviews on all aspects of oncology research including carcinogenesis, metastasis, epidemiology, chemotherapy and viral oncology. Through fair and efficient peer review, the journal is dedicated to publishing top tier research in the field, offering authors rapid publication as well as high standards of copy-editing and production. The International Journal of Oncology is published on a monthly basis in both print and early online.
  • Editorial Board
  • Information for Authors
  • Submit a Paper
  • Subscribe to this Title
  • Information for Advertisers
  • Terms & Conditions
  • Ingenta Connect is not responsible for the content or availability of external websites
  • Access Key
  • Free content
  • Partial Free content
  • New content
  • Open access content
  • Partial Open access content
  • Subscribed content
  • Partial Subscribed content
  • Free trial content
Cookie Policy
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more