Volume 353, Issue 12 2000066
FULL PAPER

Synthesis and radioligand-binding assay of 2,5-disubstituted thiadiazoles and evaluation of their anticonvulsant activities

Mahsa Toolabi

Mahsa Toolabi

Department of Medicinal Chemistry, School of Pharmacy, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran

Search for more papers by this author
Mona Khoramjouy

Mona Khoramjouy

Department of Pharmacology and Toxicology, School of Pharmacy, Shahid Beheshti University of Medical Sciences, Tehran, Iran

Search for more papers by this author
Ayoub Aghcheli

Ayoub Aghcheli

Drug Design and Development Research Center, The Institute of Pharmaceutical Sciences (TIPS), Tehran University of Medical Sciences, Tehran, Iran

Search for more papers by this author
Adileh Ayati

Adileh Ayati

Drug Design and Development Research Center, The Institute of Pharmaceutical Sciences (TIPS), Tehran University of Medical Sciences, Tehran, Iran

Search for more papers by this author
Setareh Moghimi

Setareh Moghimi

Drug Design and Development Research Center, The Institute of Pharmaceutical Sciences (TIPS), Tehran University of Medical Sciences, Tehran, Iran

Search for more papers by this author
Loghman Firoozpour

Loghman Firoozpour

Drug Design and Development Research Center, The Institute of Pharmaceutical Sciences (TIPS), Tehran University of Medical Sciences, Tehran, Iran

Search for more papers by this author
Soraya Shahhosseini

Soraya Shahhosseini

Department of Pharmaceutical Chemistry and Radiopharmacy, School of Pharmacy, Shahid Beheshti University of Medical Sciences, Tehran, Iran

Search for more papers by this author
Rouhallah Shojaei

Rouhallah Shojaei

Parsian Pharmaceutical Co., Alborz, Iran

Search for more papers by this author
Ali Asadipour

Ali Asadipour

Neuroscience Research Center, Institute of Neuropharmacology, Kerman University of Medical Sciences, Kerman, Iran

Search for more papers by this author
Kouros Divsalar

Kouros Divsalar

Neuroscience Research Center, Institute of Neuropharmacology, Kerman University of Medical Sciences, Kerman, Iran

Search for more papers by this author
Mehrdad Faizi

Corresponding Author

Mehrdad Faizi

Department of Pharmacology and Toxicology, School of Pharmacy, Shahid Beheshti University of Medical Sciences, Tehran, Iran

Correspondence Mehrdad Faizi, Department of Pharmacology and Toxicology, School of Pharmacy, Shahid Beheshti University of Medical Sciences, 1991953381 Tehran, Iran.

Email: [email protected]

Alireza Foroumadi, Department of Medicinal Chemistry, Faculty of Pharmacy, Tehran University of Medical Sciences, 14174 Tehran, Iran.

Email: [email protected]

Search for more papers by this author
Alireza Foroumadi

Alireza Foroumadi

Neuroscience Research Center, Institute of Neuropharmacology, Kerman University of Medical Sciences, Kerman, Iran

Department of Medicinal Chemistry, Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran, Iran

Search for more papers by this author
First published: 27 August 2020
Citations: 11

Abstract

In this study, a number of 2,5-disubstituted 1,3,4-thiadiazoles were synthesized using an appropriate synthetic route, and their anticonvulsant activity was determined by the maximal electroshock seizure (MES) test and their neurotoxicity was evaluated by the rotarod test. Additionally, their hypnotic activity was tested using the pentobarbital-induced sleep test. Compounds 7 (ED50 = 1.14 and 2.72 μmol/kg in the MES and sleep tests, respectively) and 11 (ED50 = 0.65 and 2.70 μmol/kg in the MES and sleep tests, respectively) were the most potent ones in the sleep test and anticonvulsant test, showing a comparable activity with diazepam as the reference drug. The results of in vivo studies, especially the antagonistic effects of flumazenil, and also the radioligand-binding assay confirmed the involvement of benzodiazepine (BZD) receptors in the anticonvulsant and hypnotic activity of compounds 7 and 11. Finally, the docking study of compound 11 in the BZD-binding site of the GABAA (gamma-aminobutyric acid) receptor confirmed the possible binding of the compound to the BZD receptors. We concluded that the novel 1,3,4-thiadiazole derivatives with appropriate substitution at positions 2 and 5 of the heterocyclic ring had a good affinity to BZD receptors and showed significant efficacy in the pharmacological tests.

CONFLICTS OF INTERESTS

The authors declare that there are no conflicts of interest.

The full text of this article hosted at iucr.org is unavailable due to technical difficulties.