TY - JOUR
T1 - Synthesis and biological evaluation of novel 2,3-disubstituted benzofuran analogues of GABA as neurotropic agents
AU - Coaviche-Yoval, Arturo
AU - Luna, Héctor
AU - Tovar-Miranda, Ricardo
AU - Soriano-Ursúa, Marvin A.
AU - Trujillo-Ferrara, José G.
N1 - Publisher Copyright:
© 2019 Bentham Science Publishers.
PY - 2019
Y1 - 2019
N2 - Background: Benzofurans are heterocyclic compounds with neurotropic activity. Some have been developed for the treatment of acute and degenerative neuronal injuries. Objective: The study aimed to evaluate the in silico binding of some promising benzofurans on the GABA receptors, and the in vivo neurotropic activity of benzofuran analogues (BZF 6-10) of gamma-aminobutyric acid (GABA) on a seizure model. Methods: The ligands with the best physicochemical attributes were docked on two GABA receptors (the alpha-1 subunit of GABAA-R and GBR1 subunit of GABAB-R). Selected benzofuran derivatives were synthesized by a multistep procedure and characterized. To examine the neurotropic effects, mice were pretreated with different concentrations of the compounds prior to PTZ- or 4- AP-induced seizures. We assessed acute toxicity, motor behavior, and the effects on seizures. Results: The tested ligands that complied with Lipinski’s rule of five were tested in silico with GABAA-R (δG = -5.51 to -5.84 kcal/mol) at the allosteric site for benzodiazepines. They bound to a similar cluster of residues as the reference compound (gaboxadol, δG = -5.51 kcal/mol). Synthesis was achieved with good overall yields (42-9.7%). Two compounds were selected for biological tests (BZF-7 and rac-BZF-10) on a mouse model of seizures, induced by pentylenetetrazol (PTZ) or 4-aminopyridine (4-AP). PTZ-induced seizures are associated with GABA receptors, and those 4-AP-induced with the blockage of the delayed rectifier-type potassium channel, which promotes the release of the NMDA-sensitive glutamatergic ionotropic receptor and other neurotransmitters. The biological assays demonstrated that BZF-7 and rac-BZF-10 do not protect against seizures. Indeed, BZF-7 increased the number of PTZ-induced seizures and decreased latency time. The 4-AP model apparently showed a potentiation of seizure effects after administration of the BZF-analogues, evidenced by the incidence and severity of the seizures and reduced latency time. Conclusion: The results suggest that the test compounds are GABAergic antagonists with stimulatory activity on the CNS.
AB - Background: Benzofurans are heterocyclic compounds with neurotropic activity. Some have been developed for the treatment of acute and degenerative neuronal injuries. Objective: The study aimed to evaluate the in silico binding of some promising benzofurans on the GABA receptors, and the in vivo neurotropic activity of benzofuran analogues (BZF 6-10) of gamma-aminobutyric acid (GABA) on a seizure model. Methods: The ligands with the best physicochemical attributes were docked on two GABA receptors (the alpha-1 subunit of GABAA-R and GBR1 subunit of GABAB-R). Selected benzofuran derivatives were synthesized by a multistep procedure and characterized. To examine the neurotropic effects, mice were pretreated with different concentrations of the compounds prior to PTZ- or 4- AP-induced seizures. We assessed acute toxicity, motor behavior, and the effects on seizures. Results: The tested ligands that complied with Lipinski’s rule of five were tested in silico with GABAA-R (δG = -5.51 to -5.84 kcal/mol) at the allosteric site for benzodiazepines. They bound to a similar cluster of residues as the reference compound (gaboxadol, δG = -5.51 kcal/mol). Synthesis was achieved with good overall yields (42-9.7%). Two compounds were selected for biological tests (BZF-7 and rac-BZF-10) on a mouse model of seizures, induced by pentylenetetrazol (PTZ) or 4-aminopyridine (4-AP). PTZ-induced seizures are associated with GABA receptors, and those 4-AP-induced with the blockage of the delayed rectifier-type potassium channel, which promotes the release of the NMDA-sensitive glutamatergic ionotropic receptor and other neurotransmitters. The biological assays demonstrated that BZF-7 and rac-BZF-10 do not protect against seizures. Indeed, BZF-7 increased the number of PTZ-induced seizures and decreased latency time. The 4-AP model apparently showed a potentiation of seizure effects after administration of the BZF-analogues, evidenced by the incidence and severity of the seizures and reduced latency time. Conclusion: The results suggest that the test compounds are GABAergic antagonists with stimulatory activity on the CNS.
KW - 2,3-disubstituted benzofurans (BZF)
KW - 4-aminopyridine (4-AP)
KW - GABA receptor (GABA-R)
KW - Molecular docking
KW - Pentylenetetrazol (PTZ)
KW - Seizures
UR - http://www.scopus.com/inward/record.url?scp=85060031992&partnerID=8YFLogxK
U2 - 10.2174/1573406414666180524091745
DO - 10.2174/1573406414666180524091745
M3 - Artículo
C2 - 29792150
AN - SCOPUS:85060031992
SN - 1573-4064
VL - 15
SP - 77
EP - 86
JO - Medicinal Chemistry
JF - Medicinal Chemistry
IS - 1
ER -