RESUMO
Blockade of immune checkpoint PD-1/PD-L1 has been a promising anticancer strategy; however, clinically available PD-1/PD-L1 small-molecule inhibitors are lacking. In view of the high potency of compound 2 (BMS-1002), structural fine tuning of the methoxy linkage together with diverse modification in the solvent interaction region was conducted. A series of novel derivatives featuring a difluoromethyleneoxy linkage were designed. Compound 43 was identified as the most promising PD-1/PD-L1 inhibitor with an IC50 value of 10.2 nM in the HTRF assay. This compound is capable of promoting CD8+ T cell activation through inhibiting PD-1/PD-L1 cellular signaling. Moreover, in the Hepa1-6 syngeneic mouse model, administration of compound 43 at 1 mg/kg dosage promoted CD8+ T cell activation and delayed the tumor growth with good tolerance. Notably, the tumor in one mouse of the compound 43-treated group was completely regressed. These results indicate that compound 43 is a promising candidate worthy of further investigation.
Assuntos
Antígeno B7-H1/antagonistas & inibidores , Desenho de Fármacos , Inibidores de Checkpoint Imunológico/química , Inibidores de Checkpoint Imunológico/farmacologia , Receptor de Morte Celular Programada 1/antagonistas & inibidores , Animais , Linfócitos T CD8-Positivos/imunologia , Linhagem Celular Tumoral , Humanos , Inibidores de Checkpoint Imunológico/síntese química , Inibidores de Checkpoint Imunológico/farmacocinética , Interferon gama/metabolismo , Camundongos , Camundongos Endogâmicos C57BL , Simulação de Acoplamento Molecular , Transdução de Sinais , Ensaios Antitumorais Modelo de XenoenxertoRESUMO
Starting from the antimalarial drugs chloroquine and hydroxychloroquine, we conducted a structural optimization on the side chain of chloroquine by introducing amino substituted longer chains thus leading to a series of novel aminochloroquine derivatives. Anti-infectious effects against SARS-Cov2 spike glycoprotein as well as immunosuppressive and anti-inflammatory activities of the new compounds were evaluated. Distinguished immunosuppressive activities on the responses of T cell, B cell and macrophages upon mitogen and pathogenic signaling were manifested. Compounds 9-11 displayed the most promising inhibitory effects both on cellular proliferation and on the production of multiple pro-inflammatory cytokines, including IL-17, IFN-γ, IL-6, IL-1ß and TNF-α, which might be insightful in the pursuit of treatment for immune disorders and inflammatory diseases.
Assuntos
Aminas/farmacologia , Anti-Inflamatórios não Esteroides/farmacologia , Antivirais/farmacologia , Cloroquina/farmacologia , SARS-CoV-2/efeitos dos fármacos , Glicoproteína da Espícula de Coronavírus/antagonistas & inibidores , Aminas/química , Anti-Inflamatórios não Esteroides/síntese química , Anti-Inflamatórios não Esteroides/química , Antivirais/síntese química , Antivirais/química , Linfócitos B/imunologia , Proliferação de Células/efeitos dos fármacos , Cloroquina/síntese química , Cloroquina/química , Citocinas/metabolismo , Relação Dose-Resposta a Droga , Humanos , Macrófagos/efeitos dos fármacos , Macrófagos/imunologia , Testes de Sensibilidade Microbiana , Estrutura Molecular , SARS-CoV-2/metabolismo , Glicoproteína da Espícula de Coronavírus/metabolismo , Relação Estrutura-Atividade , Linfócitos T/efeitos dos fármacos , Linfócitos T/imunologiaRESUMO
Activation of the stimulator of interferon gene (STING) has emerged as an exciting immuno-oncology therapeutic strategy; however, the first-generation STING agonists, cyclic dinucleotide (CDN) analogues, have suffered from many disadvantages and failed in clinical trials. Therefore, non-CDN small-molecule STING agonists are urgently needed. In view of the unique structure of the high potency of dimeric amidobenzimidazole STING agonist 5, a structural elaboration was conducted by modifying several structural hotspots of this scaffold. Triazole 40 was identified as a new potent STING activator, possessing EC50 values of 0.24 and 39.51 µM for h- and m-STING, respectively. This compound has a slightly better pharmacokinetic profile and is >20-fold more aqueously soluble than 5. It activated the STING signaling dramatically by directly binding and stabilizing all h-STING isoforms and m-STING. In vivo, intermittent administration of 40 was found to have significant antitumor efficacy with good tolerance in two mouse tumor models.
Assuntos
Antineoplásicos/síntese química , Antineoplásicos/farmacologia , Benzimidazóis/síntese química , Benzimidazóis/farmacologia , Proteínas de Membrana/agonistas , Animais , Antineoplásicos/farmacocinética , Benzimidazóis/farmacocinética , Humanos , Camundongos , Camundongos Endogâmicos BALB C , Modelos Moleculares , Solubilidade , Relação Estrutura-Atividade , Ensaios Antitumorais Modelo de XenoenxertoRESUMO
Starting from the recently launched FLT3/AXL multi-targeted inhibitor Gilteritinib (5), we conducted a side-chain ring closure medicinal chemistry approach leading to the identification of compound 15c as a highly potent AXL inhibitor in the biochemical and cellular anti-proliferative assays, with IC50 values of 1.2 and 0.3â¯nM, respectively. Compared with the reference compound 5, our new discovered AXL inhibitor 15c is more potent in both assays.