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1.
ACS Pharmacol Transl Sci ; 5(11): 1156-1168, 2022 Nov 11.
Artigo em Inglês | MEDLINE | ID: mdl-36407952

RESUMO

Bruton's tyrosine kinase (BTK) is a member of the TEC-family kinases and crucial for the proliferation and differentiation of B-cells. We evaluated the therapeutic potential of a covalent inhibitor (JS25) with nanomolar potency against BTK and with a more desirable selectivity and inhibitory profile compared to the FDA-approved BTK inhibitors ibrutinib and acalabrutinib. Structural prediction of the BTK/JS25 complex revealed sequestration of Tyr551 that leads to BTK's inactivation. JS25 also inhibited the proliferation of myeloid and lymphoid B-cell cancer cell lines. Its therapeutic potential was further tested against ibrutinib in preclinical models of B-cell cancers. JS25 treatment induced a more pronounced cell death in a murine xenograft model of Burkitt's lymphoma, causing a 30-40% reduction of the subcutaneous tumor and an overall reduction in the percentage of metastasis and secondary tumor formation. In a patient model of diffuse large B-cell lymphoma, the drug response of JS25 was higher than that of ibrutinib, leading to a 64% "on-target" efficacy. Finally, in zebrafish patient-derived xenografts of chronic lymphocytic leukemia, JS25 was faster and more effective in decreasing tumor burden, producing superior therapeutic effects compared to ibrutinib. We expect JS25 to become therapeutically relevant as a BTK inhibitor and to find applications in the treatment of hematological cancers and other pathologies with unmet clinical treatment.

2.
Angew Chem Int Ed Engl ; 60(49): 25914-25921, 2021 12 01.
Artigo em Inglês | MEDLINE | ID: mdl-34741376

RESUMO

Antibody-drug conjugates (ADCs) are a new class of therapeutics that combine the lethality of potent cytotoxic drugs with the targeting ability of antibodies to selectively deliver drugs to cancer cells. In this study we show for the first time the synthesis of a reactive-oxygen-species (ROS)-responsive ADC (VL-DAB31-SN-38) that is highly selective and cytotoxic to B-cell lymphoma (CLBL-1 cell line, IC50 value of 54.1 nM). The synthesis of this ADC was possible due to the discovery that diazaborines (DABs) are a very effective ROS-responsive unit that are also very stable in buffer and in plasma. DFT calculations performed on this system revealed a favorable energetic profile (ΔGR=-74.3 kcal mol-1 ) similar to the oxidation mechanism of aromatic boronic acids. DABs' very fast formation rate and modularity enabled the construction of different ROS-responsive linkers featuring self-immolative modules, bioorthogonal functions, and bioconjugation handles. These structures were used in the site-selective functionalization of a VL antibody domain and in the construction of the homogeneous ADC.


Assuntos
Antineoplásicos/farmacologia , Compostos de Boro/farmacologia , Imunoconjugados/farmacologia , Linfoma de Células B/tratamento farmacológico , Espécies Reativas de Oxigênio/metabolismo , Antineoplásicos/química , Antineoplásicos/metabolismo , Compostos de Boro/química , Proliferação de Células/efeitos dos fármacos , Sobrevivência Celular/efeitos dos fármacos , Ensaios de Seleção de Medicamentos Antitumorais , Humanos , Imunoconjugados/química , Imunoconjugados/metabolismo , Linfoma de Células B/metabolismo , Linfoma de Células B/patologia , Estrutura Molecular
3.
Inorg Chem ; 59(17): 12722-12732, 2020 Sep 08.
Artigo em Inglês | MEDLINE | ID: mdl-32838513

RESUMO

A small library of "half-sandwich" cyclopentadienylruthenium(II) compounds of the general formula [(η5-C5R5)Ru(PPh3)(N-N)][PF6], a scaffold hitherto absent from the toolbox of antiplasmodials, was screened for activity against the blood stage of CQ-sensitive 3D7-GFP, CQ-resistant Dd2, and artemisinin-resistant IPC5202 Plasmodium falciparum strains and the liver stage of Plasmodium berghei. The best-performing compounds displayed dual-stage activity, with single-digit nanomolar IC50 values against blood-stage malaria parasites, nanomolar activity against liver-stage parasites, and residual cytotoxicity against HepG2 and Huh7 mammalian cells. The parasitic absorption/distribution of 7-nitrobenzoxadiazole-appended fluorescent compounds Ru4 and Ru5 was investigated by confocal fluorescence microscopy, revealing parasite-selective absorption in infected erythrocytes and nuclear accumulation of both compounds. The lead compound Ru2 impaired asexual parasite differentiation, exhibiting fast parasiticidal activity against both ring and trophozoite stages of a synchronized culture of the P. falciparum 3D7 strain. These results point to cyclopentadienylruthenium(II) complexes as a highly promising chemotype for the development of dual-stage antiplasmodials.


Assuntos
Antimaláricos/química , Antimaláricos/farmacologia , Complexos de Coordenação/química , Complexos de Coordenação/farmacologia , Ciclopentanos/química , Rutênio/química , Resistência a Medicamentos/efeitos dos fármacos , Eritrócitos/efeitos dos fármacos , Células Hep G2 , Humanos , Oxidiazóis/química , Plasmodium berghei/efeitos dos fármacos , Plasmodium falciparum/efeitos dos fármacos
4.
Eur J Med Chem ; 194: 112242, 2020 May 15.
Artigo em Inglês | MEDLINE | ID: mdl-32248004

RESUMO

N-Methyl-d-aspartate receptors (NMDARs) are crucial for the normal function of the central nervous system (CNS), and fundamental in memory and learning-related processes. The overactivation of these receptors is associated with numerous neurodegenerative and psychiatric disorders. Therefore, NMDAR is considered a relevant therapeutic target for many CNS disorders. Herein, we report the synthesis and pharmacological evaluation of a new scaffold with antagonistic activity for NMDAR. Specifically, a chemical library of eighteen 1-aminoindan-2-ol tetracyclic lactams was synthesized and screened as NMDAR antagonists. The compounds were obtained by chiral pool synthesis using enantiomerically pure 1-aminoindan-2-ols as chiral inductors, and their stereochemistry was proven by X-ray crystallographic analysis of two target compounds. Most compounds reveal NMDAR antagonism, and eleven compounds display IC50 values in a Ca2+ entry-sensitive fluo-4 assay in the same order of magnitude of memantine, a clinically approved NMDAR antagonist. Docking studies suggest that the novel compounds can act as NMDAR channel blockers since there is a compatible conformation with MK-801 co-crystallized with NMDAR channel. In addition, we show that the tetracyclic 1-aminoindan-2-ol derivatives are brain permeable and non-toxic, and we identify promising hits for further optimization as modulators of the NMDAR function.


Assuntos
Lactamas/farmacologia , Doenças do Sistema Nervoso/tratamento farmacológico , Fármacos Neuroprotetores/farmacologia , Receptores de N-Metil-D-Aspartato/antagonistas & inibidores , Barreira Hematoencefálica/efeitos dos fármacos , Células Cultivadas , Relação Dose-Resposta a Droga , Células HEK293 , Células Hep G2 , Humanos , Lactamas/síntese química , Lactamas/química , Simulação de Acoplamento Molecular , Estrutura Molecular , Doenças do Sistema Nervoso/metabolismo , Fármacos Neuroprotetores/síntese química , Fármacos Neuroprotetores/química , Receptores de N-Metil-D-Aspartato/metabolismo , Relação Estrutura-Atividade
5.
Chemistry ; 24(48): 12495-12499, 2018 Aug 27.
Artigo em Inglês | MEDLINE | ID: mdl-29889332

RESUMO

Herein a new class of iminoboronates obtained from 2-acetylbenzene boronic acids and aminophenols is presented. The N,O-ligand topology enabled the formation of an additional B-O bond that locks the boron center in a tetrahedral geometry. This molecular arrangement decisively contributes to improve the construct's stability in biocompatible conditions and retaining the iminoboronate reversibility in more acidic environments. 2-Acetylbenzene boronic acid was reacted with a fluorescent amino-coumarin to yield a stable and non-fluorescent N,O-iminoboronate. This mechanism was further used to assemble a folate receptor targeting conjugate that selectively delivered the fluorescent amino-coumarin to MDA-MB-231 human breast cancer cells.


Assuntos
Ácidos Borônicos/química , Portadores de Fármacos/química , Iminas/química , Linhagem Celular Tumoral , Cumarínicos/administração & dosagem , Cumarínicos/química , Liberação Controlada de Fármacos , Estabilidade de Medicamentos , Corantes Fluorescentes/administração & dosagem , Corantes Fluorescentes/química , Transportadores de Ácido Fólico/metabolismo , Humanos , Concentração de Íons de Hidrogênio , Microambiente Tumoral
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