[Investigation of ligand-receptor interaction and biodistribution of a drug containing cattle retinal polypeptides in various administration routes].

Unlabelled: It is important to understand the features of the interaction of drug components with body receptors and obtain data on its distribution in various administration routes in recommended doses in order for its usage in clinical practice to be safe and effective.

Purpose: To investigate the interactions of a drug consisting of water-soluble polypeptide fractions produced on animal retina with a wide range of receptor targets, and to assess its biodistribution in the organs of laboratory animals.

Material And Methods: The biodistribution of the radioactively marked drug in different organs and tissues of laboratory mice in various routes of administration was studied at the National Research Centre «Kurchatov Institute». Evaluation of the ligand-receptor interaction of the drug was carried out in the laboratory at Eurofins Pharma Discovery Services by the method of competitive radioligand binding.

Results: A significant effect of the interaction of the polypeptide drug was revealed with different subtypes of glutamate receptors: AMPA, NMDA, and mGluR1. As a result of an test, we have obtained biodistribution data of the drug for intravenous, intramuscular and parabulbar administration, and the dynamics of drug accumulation in the tissues of the brain and eyes.

Conclusion: According to the study results, the peptide drug binds to receptors associated with the loss of retinal ganglion cells. Interaction with these receptors potentially provides the test subject with neuroprotective effect. The content dynamics of the studied drug in the blood of animals depends on the route of administration and the amount of drug administered. At the time point of 0.5 hours for intravenous and intramuscular administration in the dose of 1.7 mg/kg, the studied drug has sufficiently high bioavailability in the tissues of the brain and eye. The data suggest that the main route of excretion of the studied drug is through kidneys.