6533b82dfe1ef96bd1291e20

RESEARCH PRODUCT

Dopaminergic isoquinolines with hexahydrocyclopenta[ ij ]-isoquinolines as D 2 -like selective ligands

Javier PárragaSebastian RojasLucas J. GutierrezSebastian A. AndujarNuria CabedoDiego CortesRicardo D. EnrizNoureddine El AouadM Jesús Sanz

subject

Models MolecularMolecular modelProtein ConformationStereochemistryDopamine AgentsSubstituentCyclopentanesLigands010402 general chemistry01 natural sciencesSubstrate SpecificityStructure-Activity Relationshipchemistry.chemical_compoundDrug DiscoveryHuman Umbilical Vein Endothelial CellsmedicineHumansStructure–activity relationshipCYTOTOXICITYMOLECULAR MODELINGCyclopentaneSTRUCTURE-ACTIVITY RELATIONSHIPSTETRAHYDROISOQUINOLINESPharmacologyCatecholReceptors Dopamine D2010405 organic chemistryOtras Ciencias QuímicasOrganic ChemistryDopaminergicCiencias QuímicasGeneral MedicineIsoquinolines0104 chemical sciencesOxygenDOPAMINERGICchemistryTHIQHEXAHYDROCYCLOPENTAISOQUINOLINESSelectivityCIENCIAS NATURALES Y EXACTASmedicine.drug

description

Dopamine receptors (DR) ligands are potential drug candidates for treating neurological disorders including schizophrenia or Parkinson's disease. Three series of isoquinolines: (E)-1-styryl-1,2,3,4-tetrahydroisoquinolines (series 1), 7-phenyl-1,2,3,7,8,8a-hexahydrocyclopenta[ij]-IQs (HCPIQs) (series 2) and (E)-1-(prop-1-en-1-yl)-1,2,3,4- tetrahydroisoquinolines (series 3), were prepared to determine their affinity for both D1and D2-like DR. The effect of different substituents on the nitrogen atom (methyl or allyl), the dioxygenated function (methoxyl or catechol), the substituent at the β-position of the THIQ skeleton, and the presence or absence of the cyclopentane motif, were studied. We observed that the most active compounds in the three series (2c, 2e, 3a, 3c, 3e, 5c and 5e) possessed a high affinity for D2-like DR and these remarkable features: a catechol group in the IQ-ring and the N-substitution (methyl or allyl). The series showed the following trend to D2-RD affinity: HCPIQs > 1-styryl > 1-propenyl. Therefore, the substituent at the β-position of the THIQ and the cyclopentane ring also modulated this affinity. Among these dopaminergic isoquinolines, HCPIQs stood out for unexpected selectivity to D2-DR since the Ki D1/D2ratio reached values of 2465, 1010 and 382 for compounds 3a, 3c and 3e, respectively. None of the most active THIQs in D2DR displayed relevant cytotoxicity in human neutrophils and HUVEC. Finally, and in agreement with the experimental data, molecular modeling studies on DRs of the most characteristic ligands of the three series revealed stronger molecular interactions with D2DR than with D1DR, which further supports to the encountered enhanced selectivity to D2DR. Fil: Párraga, Javier. Universidad de Valencia; España Fil: Andujar, Sebastian Antonio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Luis. Instituto Multidisciplinario de Investigaciones Biológicas de San Luis. Universidad Nacional de San Luis. Facultad de Ciencias Físico Matemáticas y Naturales. Instituto Multidisciplinario de Investigaciones Biológicas de San Luis; Argentina Fil: Rojas, Sebastian. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Luis. Instituto Multidisciplinario de Investigaciones Biológicas de San Luis. Universidad Nacional de San Luis. Facultad de Ciencias Físico Matemáticas y Naturales. Instituto Multidisciplinario de Investigaciones Biológicas de San Luis; Argentina Fil: Gutierrez, Lucas Joel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Luis. Instituto Multidisciplinario de Investigaciones Biológicas de San Luis. Universidad Nacional de San Luis. Facultad de Ciencias Físico Matemáticas y Naturales. Instituto Multidisciplinario de Investigaciones Biológicas de San Luis; Argentina Fil: El Aouad, Noureddine. Université Ibn-Zohr; Marruecos Fil: Sanz, M. Jesús. Universidad de Valencia; España. Hospital Clínico Universitario de Valencia. Instituto de Investigación Sanitaria; España Fil: Enriz, Ricardo Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Luis. Instituto Multidisciplinario de Investigaciones Biológicas de San Luis. Universidad Nacional de San Luis. Facultad de Ciencias Físico Matemáticas y Naturales. Instituto Multidisciplinario de Investigaciones Biológicas de San Luis; Argentina Fil: Cabedo, Nuria. Universidad de Valencia; España. Hospital Clínico Universitario de Valencia. Instituto de Investigación Sanitaria; España Fil: Cortes, Diego. Universidad de Valencia; España

https://doi.org/10.1016/j.ejmech.2016.06.009