Antiparkinsonian activity of selective MAO-B inhibitors of different chemical structures.

Introduction: Parkinson’s disease (PD) is a chronic neurodegenerative disease of the central nervous system, the pathogenesis of which is associated with the death of dopaminergic neurons of the midbrain substantia nigra. The mainstay of therapy for PD is levodopa. However, in the initial stages of PD or in case of levodopa intolerance, MAO B inhibitors are used. Purpose of the study was to determine antiparkinsonian activity of newly synthesized selective MAO-B inhibitors in vivo on the model of experimental parkinsonism in white mice. Materials and Methods: Parkinsonian syndrome in mice was modeled by systemic administration of 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP). As the criteria for its evaluation, we used the determination of muscle rigidity severity by step length of mice and evaluation of oligokinesia severity and emotional and mental disturbances in the open field test. A total of 9 candidate compounds were studied, assigned with laboratory codes S1-S5, S9, S10, S14, and S15. Rasagiline was used as a comparison drug. Results and Discussion: Of the 9 compounds used at a dosage of 2mg/kg, the degree of rigidity was significantly reduced by compounds S1, S9, and S15; locomotor activity was restored to the level reached through rasagiline only by compound S9; the decline in exploratory activity was prevented only by S9 and to some extent by S5. Conclusion: Only compound S9 having benzenesulfonamide chemotype showed significant therapeutic potential in a model of experimental parkinsonism and only in relation to it additional studies can be planned.