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Leflunomide interferes with pyrimidine nucleotide biosynthesis
H M Cherwinski1, N Byars, S J Ballaron
1Institute of Immunology, Syntex Discovery Research, Palo Alto, CA 94304, USA.
Summary
Leflunomide, an immunosuppressive drug, inhibits cell proliferation by interfering with pyrimidine nucleotide synthesis. This mechanism explains its anti-inflammatory effects and antiproliferative activity against various cells.
Area of Science:
- Immunology
- Pharmacology
- Cell Biology
Background:
- Leflunomide is an anti-inflammatory and immunosuppressive agent.
- Its antiproliferative effects on transformed cells and lymphocytes suggest a mechanism involving nucleotide metabolism.
Purpose of the Study:
- To investigate the mechanism of leflunomide's antiproliferative activity.
- To determine whether leflunomide affects nucleotide metabolism.
Main Methods:
- Testing leflunomide's anti-proliferative activity on various cell types.
- Assessing the effect of uridine, cytidine, and purine nucleotides on leflunomide's activity.
- Measuring nucleotide pools in leflunomide-treated human T cells and rat spleen cells.
Main Results:
- Leflunomide demonstrated anti-proliferative activity against all tested cells.
- This activity was reversed by uridine or cytidine, but not purine nucleotides.
- Leflunomide treatment led to reduced pyrimidine nucleotide levels in cells.
Conclusions:
- Leflunomide's anti-proliferative effects are attributed to the inhibition of pyrimidine biosynthesis.
- This highlights the critical role of pyrimidine metabolism in leflunomide's mechanism of action.