[Mathematical description and study of the folic acid cycle reactions]

A general description of the folic acid cycle and associate reactions of thymidilate, purines, methionine and serine biosyntheses is presented as a system of differential equations. The concrete models of this reaction complex as well as methotrexate transport into the leukemia L 1210 and Ehrlich ascite tumour cells and the dynamic inhibition of the target enzyme--dihydrofolate reductase--by methotrexate have been described and investigated. The adequacy of mathematical models to the experimental data has been demonstrated.