Neuroprotective properties of n-phenylacetyl-l-prolylglycine ethyl ester nasal gel in an experimental model of multiple sclerosis equivalent

The purpose of this research is to study the specific activity of our developed nasal dosage form with n-phenylacetyl-l-prolylglycine ethyl ester. The experiments were performed on 260 white outbred rats weighing 190-220 g. Experimental allergic encephalomyelitis (EAE) was induced by a single subcutaneous inoculation of an encephalitogenic mixture (EHM) in Complete Freund's Adjuvant (CFA) based on 100 mg of homologous spinal cord homogenate; 0.2 ml of CFA (the content of killed mycobacteria 5 mg/ml) and 0.2 ml of physiological saline per animal. There were five groups of animals in the study: 1) intact; 2) control - untreated with EAE, received saline solution; 3) animals with EAE that received basic treatment - methylprednisolone (MP), 3.4 mg/kg, intraperitoneally slowly in saline no more than 1/10 of the CBV rat; 4) animals with EAE treated with MP + Noopept, at a dose of 10 mg/kg; 5) animals with EAE treated with MP + Citicoline (Ceraxon, Ferrer Internacional S.A., Spain) D003U1 series, 500 mg/kg, intragastrically. The in­tegrative functions of rats’ brain with EAE were studied using the “Open Field” method with an arena of own production with dimensions 80x80x35 cm. The study of memory was carried out using the radial labyrinth LE760 (AgnTho's, Sweden). Capture and image recording was carried out using a color video camera SSC-DC378P (Sony, Japan). Video file analysis was performed using Smartv 3.0 software (Harvard Apparatus, USA). As a result of the stu­dies on experimental model of multiple sclerosis with a nasal gel containing ethyl ester of n-phenylacetyl-l-pro­lylglycine revealed the presence of normotimic activity, antidepressant and anxiolytic effects, an increase in the total activity of the central nervous system. The results obtained indicate a high neuroprotective and nootropic activity of the Noopept intranasal gel. By the degree of influence on reducing the number of errors in working memory, the Noopept gel sig­nificantly exceeds monotherapy with methylprednisolone and combination therapy with methylprednisolone and citi­coline. A further study of the effect of the developed nasal gel on the morphofunctional indices of sensorimotor cortical neurons under experimental multiple sclerosis, as well as on the content of HSP70 in the animal brain, is promising.