A 23-year-old female underwent kidney transplantation. After 8 days, she suffered from acute humoral rejection. She was successfully managed with tacrolimus and one more drug that suppressed B and T lymphocytes. Drug which target both B and T lymphocytes inhibiting de novo synthesis of purines is?: (A) Cyclophosphamide, (B) Mycophenolate mofetil, (C) Methotrexate, (D) Prednisone
Answer is B. Mycophenolic acid is formed from mycophenolate mofetil. It inhibits inosine monophosphate dehydrogenase, the rate limiting enzyme in the de novo pathway of purine synthesis. This action suppresses both B and T-lymphocytes.