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Maltsev DV, Spasov AA, Yakovlev DS, Vassiliev PM, Skripka MO, Miroshnikov MV, Sultanova KT, Kochetkov AN, Divaeva LN, Kuzmenko TA, Morkovnik AS. Searching for new anxiolytic agents among derivatives of 11-dialkylaminoethyl-2,3,4,5-tetrahydrodiazepino[1,2-a]benzimidazole. Eur J Pharm Sci 2021; 161:105792. [PMID: 33705965 DOI: 10.1016/j.ejps.2021.105792] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2020] [Revised: 02/27/2021] [Accepted: 03/03/2021] [Indexed: 12/14/2022]
Abstract
A study on the anxiolytic activity of the new derivatives of 11-dialkylaminoethyl-2,3,4,5-tetrahydrodiazepino[1,2-a]benzimidazole, containing privileged scaffolds of benzodiazepine and benzimidazole in their structure, was conducted. The cytotoxic properties of low levels of six compounds were preliminary determined in vitro using the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide test. The screening of these substances for anxiolytic activity was conducted using elevated plus maze (EPM) test in vivo, and DAB-21 was found to be the most active compound. The acute toxicity of DAB-21 was determined as less toxic than that of diazepam. The dose-dependent effect of the most active compound revealed a minimum dose of 1.26 mg/kg, which resulted in the maximum counterphobic effect. The effect of DAB-21 was superior in a number of tests compared with that of diazepam, which indicated a high level of tranquilizing activity for DAB-21. The results of in silico docking analysis suggest that DAB-21 should have a slightly lower anxiolytic activity than diazepam, but should exhibit greater specific affinity for the benzodiazepine site of the GABAA receptor, in comparison with its GABA-binding site. The interaction between DAB-21 and flumazenil in terms of EPM verifies the GABAergic mechanism of action of DAB-21. Our results highlight the potential of 11-dialkylaminomethyl-2,3,4,5-tetrahydrodiazepino[1,2-a]benzimidazoles as promising compounds in the search for new highly effective anxiolytics.
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Affiliation(s)
- Dmitriy V Maltsev
- Volgograd State Medical University, Department of Pharmacology and Bioinformatics; 1 Pavshikh Bortsov sq., Volgograd, Russia; Volgograd Medical Research Center; 1 Pavshikh Bortsov sq., Volgograd, Russia.
| | - Alexander A Spasov
- Volgograd State Medical University, Department of Pharmacology and Bioinformatics; 1 Pavshikh Bortsov sq., Volgograd, Russia; Volgograd Medical Research Center; 1 Pavshikh Bortsov sq., Volgograd, Russia
| | - Dmitriy S Yakovlev
- Volgograd State Medical University, Department of Pharmacology and Bioinformatics; 1 Pavshikh Bortsov sq., Volgograd, Russia; Volgograd Medical Research Center; 1 Pavshikh Bortsov sq., Volgograd, Russia
| | - Pavel M Vassiliev
- Volgograd State Medical University, Department of Pharmacology and Bioinformatics; 1 Pavshikh Bortsov sq., Volgograd, Russia
| | - Maria O Skripka
- Volgograd State Medical University, Department of Pharmacology and Bioinformatics; 1 Pavshikh Bortsov sq., Volgograd, Russia
| | - Mikhail V Miroshnikov
- Volgograd State Medical University, Department of Pharmacology and Bioinformatics; 1 Pavshikh Bortsov sq., Volgograd, Russia
| | - Kira T Sultanova
- Volgograd State Medical University, Department of Pharmacology and Bioinformatics; 1 Pavshikh Bortsov sq., Volgograd, Russia; Volgograd Medical Research Center; 1 Pavshikh Bortsov sq., Volgograd, Russia
| | - Andrey N Kochetkov
- Volgograd State Medical University, Department of Pharmacology and Bioinformatics; 1 Pavshikh Bortsov sq., Volgograd, Russia
| | - Lyudmila N Divaeva
- Southern Federal University, Research Institute of Physical and Organic Chemistry; 105/42 Bolshaya Sadovaya str., Rostov-on-Don, Russia
| | - Tatyana A Kuzmenko
- Southern Federal University, Research Institute of Physical and Organic Chemistry; 105/42 Bolshaya Sadovaya str., Rostov-on-Don, Russia
| | - Anatolii S Morkovnik
- Southern Federal University, Research Institute of Physical and Organic Chemistry; 105/42 Bolshaya Sadovaya str., Rostov-on-Don, Russia
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