Highly Potent and Selective Dopamine D4 Receptor Antagonists Potentially Useful for the Treatment of Glioblastoma. 2022

Pegi Pavletić, and Ana Semeano, and Hideaki Yano, and Alessandro Bonifazi, and Gianfabio Giorgioni, and Alessandro Piergentili, and Wilma Quaglia, and Maria Giovanna Sabbieti, and Dimitrios Agas, and Giorgio Santoni, and Roberto Pallini, and Lucia Ricci-Vitiani, and Emanuela Sabato, and Giulio Vistoli, and Fabio Del Bello
Scuola di Scienze del Farmaco e dei Prodotti della Salute, Università di Camerino,, Camerino 62032, Italy.

To better understand the role of dopamine D4 receptor (D4R) in glioblastoma (GBM), in the present paper, new ligands endowed with high affinity and selectivity for D4R were discovered starting from the brain penetrant and D4R selective lead compound 1-(3-(4-phenylpiperazin-1-yl)propyl)-3,4-dihydroquinolin-2(1H)-one (6). In particular, the D4R antagonist 24, showing the highest affinity and selectivity over D2R and D3R within the series (D2/D4 = 8318, D3/D4 = 3715), and the biased ligand 29, partially activating D4R Gi-/Go-protein and blocking β-arrestin recruitment, emerged as the most interesting compounds. These compounds, evaluated for their GBM antitumor activity, induced a decreased viability of GBM cell lines and primary GBM stem cells (GSC#83), with the maximal efficacy being reached at a concentration of 10 μM. Interestingly, the treatment with both compounds 24 and 29 induced an increased effect in reducing the cell viability with respect to temozolomide, which is the first-choice chemotherapeutic drug in GBM.

UI MeSH Term Description Entries
D008024 Ligands A molecule that binds to another molecule, used especially to refer to a small molecule that binds specifically to a larger molecule, e.g., an antigen binding to an antibody, a hormone or neurotransmitter binding to a receptor, or a substrate or allosteric effector binding to an enzyme. Ligands are also molecules that donate or accept a pair of electrons to form a coordinate covalent bond with the central metal atom of a coordination complex. (From Dorland, 27th ed) Ligand
D005909 Glioblastoma A malignant form of astrocytoma histologically characterized by pleomorphism of cells, nuclear atypia, microhemorrhage, and necrosis. They may arise in any region of the central nervous system, with a predilection for the cerebral hemispheres, basal ganglia, and commissural pathways. Clinical presentation most frequently occurs in the fifth or sixth decade of life with focal neurologic signs or seizures. Astrocytoma, Grade IV,Giant Cell Glioblastoma,Glioblastoma Multiforme,Astrocytomas, Grade IV,Giant Cell Glioblastomas,Glioblastoma, Giant Cell,Glioblastomas,Glioblastomas, Giant Cell,Grade IV Astrocytoma,Grade IV Astrocytomas
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000071557 beta-Arrestins Non-visual system arrestins that negatively regulate G-PROTEIN-COUPLED RECEPTORS (GPCRs) and may also function independently of GPCR signaling. They bind and recruit many different signaling factors, including MITOGEN-ACTIVATED PROTEIN KINASES; SRC-FAMILY-KINASES; and FILAMIN to GPCRs and may recognize different phosphorylation states of the receptors to determine the specificity of the cellular response to signaling. beta-Arrestin,beta Arrestin,beta Arrestins
D000077204 Temozolomide A dacarbazine derivative that is used as an alkylating antineoplastic agent for the treatment of MALIGNANT GLIOMA and MALIGNANT MELANOMA. 8-Carbamoyl-3-methylimidazo(5,1-d)-1,2,3,5-tetrazin-4(3H)-one,CCRG 81045,CCRG-81045,M&B 39831,M&B-39831,Methazolastone,NSC 362856,NSC-362856,TMZ-Bioshuttle,TMZA-HE,Temodal,Temodar,Temozolomide Hexyl Ester,CCRG81045,M&B39831,NSC362856,TMZ Bioshuttle
D050638 Receptors, Dopamine D4 A subtype of dopamine D2 receptors that has high affinity for the antipsychotic CLOZAPINE. Dopamine D4 Receptors,Dopamine D4 Receptor,Receptor, Dopamine D4,D4 Receptor, Dopamine,D4 Receptors, Dopamine
D018492 Dopamine Antagonists Drugs that bind to but do not activate DOPAMINE RECEPTORS, thereby blocking the actions of dopamine or exogenous agonists. Many drugs used in the treatment of psychotic disorders (ANTIPSYCHOTIC AGENTS) are dopamine antagonists, although their therapeutic effects may be due to long-term adjustments of the brain rather than to the acute effects of blocking dopamine receptors. Dopamine antagonists have been used for several other clinical purposes including as ANTIEMETICS, in the treatment of Tourette syndrome, and for hiccup. Dopamine receptor blockade is associated with NEUROLEPTIC MALIGNANT SYNDROME. Dopamine Antagonist,Dopamine Blocker,Dopamine Receptor Antagonist,Dopamine Receptor Antagonists,Dopaminergic Antagonist,Dopaminergic Antagonists,Antagonists, Dopamine,Antagonists, Dopamine Receptor,Antagonists, Dopaminergic,Dopamine Blockers,Antagonist, Dopamine,Antagonist, Dopamine Receptor,Antagonist, Dopaminergic,Blocker, Dopamine,Blockers, Dopamine,Receptor Antagonist, Dopamine,Receptor Antagonists, Dopamine

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