Investigation of the effect of anti-neoplastic drugs, cyclophosphamide, cisplatin and methotrexate on the turnover kinetics of human erythrocyte acetylcholinesterase.

The present work addresses the effects of three antineoplastic drugs [cyclophosphamide (CP), cisplatin (CDDP) and methotrexate (MTX) which are in current use for the treatment of various tumors] on turnover kinetics of human erythrocyte membrane-bound acetylcholinesterase (AcChoEase, EC 3.1.1.7). It was found that CP and MTX significantly decreased kcat and ksp, whereas CDDP decreased only the kcat value, (ksp was non-significantly affected). In light of these findings, the CP, CDDP and MTX needs particular attention in tumor therapy and their effects on turnover number must be considered at the time of administering these drugs to cancer patients.