RESUMO
Performances of metabolomic methods have been widely studied on biological matrices such as serum, plasma, and urine; but much less on in vitro cell extracts. While the impact of cell culture and sample preparation on results are well-described, the specific effect of the in vitro cellular matrix on the analytical performance remains uncertain. The aim of the present work was to study the impact of this matrix on the analytical performance of an LC-HRMS metabolomic method. For this purpose, experiments were performed on total extracts from two cell lines (MDA-MB-231 and HepaRG) using different cell numbers. Matrix effects, carryover, linearity, and variability of the method were studied. Results showed that the performances of the method depend on the nature of the endogenous metabolite, the cell number, and the nature of the cell line. These three parameters should, therefore, be considered for the processing of experiments and the interpretation of results depending on whether the study focuses on a limited number of metabolites or aims to establish a metabolic signature.
Assuntos
Metaboloma , Metabolômica , Metabolômica/métodos , Linhagem Celular , Plasma , Técnicas de Cultura de CélulasRESUMO
Three series of nucleotide analogues were synthesized and evaluated as potential CD73 inhibitors. Nucleobase replacement consisted in connecting the appropriate aromatic or purine residues through a triazole moiety that is generated from 1,3-dipolar cycloaddition. The first series is related to 4-substituted-1,2,3-triazolo-ß-hydroxyphosphonate ribonucleosides. Additional analogues were also obtained, in which the phosphonate group was replaced by a bisphosphonate pattern (P-C-P-C, series 2) or the ribose moiety was removed leading to acyclic derivatives (series 3). The ß-hydroxyphosphonylphosphonate ribonucleosides (series 2) were found to be potent inhibitors of CD73 using both purified recombinant protein and cell-based assays. Two compounds (2a and 2b) that contained a bis(trifluoromethyl)phenyl or a naphthyl substituents proved to be the most potent inhibitors, with IC50 values of 4.8 ± 0.8 µM and 0.86 ± 0.2 µM, compared to the standard AOPCP (IC50 value of 3.8 ± 0.9 µM), and were able to reverse the adenosine-mediated immune suppression on human T cells. This series of compounds illustrates a new type of CD73 inhibitors.
Assuntos
5'-Nucleotidase/antagonistas & inibidores , Algoritmos , Nucleotídeos/farmacologia , Triazóis/farmacologia , 5'-Nucleotidase/metabolismo , Linhagem Celular Tumoral , Relação Dose-Resposta a Droga , Avaliação Pré-Clínica de Medicamentos , Proteínas Ligadas por GPI/antagonistas & inibidores , Proteínas Ligadas por GPI/metabolismo , Humanos , Cinética , Estrutura Molecular , Nucleotídeos/síntese química , Nucleotídeos/química , Relação Estrutura-Atividade , Triazóis/síntese química , Triazóis/químicaRESUMO
Cytidine deaminase (CDA) is a determinant of in vivo gemcitabine elimination kinetics and cellular toxicity. The impact of CDA activity in pancreatic ductal adenocarcinoma (PDAC) cell lines has not been elucidated. We hypothesized that CDA regulates gemcitabine flux through its inactivation and activation pathways in PDAC cell lines. Three PDAC cell lines (BxPC-3, MIA PaCa-2, and PANC-1) were incubated with 10 or 100 µM gemcitabine for 60 minutes or 24 hours, with or without tetrahydrouridine, a CDA inhibitor. Extracellular inactive gemcitabine metabolite (dFdU) and intracellular active metabolite (dFdCTP) were quantified with liquid chromatography tandem mass spectrometry. Cellular expression of CDA was assessed with real-time PCR and Western blot. Gemcitabine conversion to dFdU was extensive in BxPC-3 and low in MIA PaCa-2 and PANC-1, in accordance with their respective CDA expression levels. CDA inhibition was associated with low or undetectable dFdU in all three cell lines. After 24 hours gemcitabine incubation, dFdCTP was highest in MIA PaCa-2 and lowest in BxPC-3. CDA inhibition resulted in a profound dFdCTP increase in BxPC-3 but not in MIA PaCa-2 or PANC-1. dFdCTP concentrations were not higher after exposure to 100 versus 10 µM gemcitabine when CDA activities were low (MIA PaCa-2 and PANC-1) or inhibited (BxPC-3). The results suggest a regulatory role of CDA for gemcitabine activation in PDAC cells but within limits related to the capacity in the activation pathway in the cell lines. SIGNIFICANCE STATEMENT: The importance of cytidine deaminase (CDA) for cellular gemcitabine toxicity, linking a lower activity to higher toxicity, is well described. An underlying assumption is that CDA, by inactivating gemcitabine, limits the amount available for the intracellular activation pathway. Our study is the first to illustrate this regulatory role of CDA in pancreatic ductal adenocarcinoma cell lines by quantifying intracellular and extracellular gemcitabine metabolite concentrations.
Assuntos
Citidina Desaminase/metabolismo , Desoxicitidina/análogos & derivados , Neoplasias Pancreáticas/metabolismo , Adenocarcinoma/metabolismo , Carcinoma Ductal Pancreático/metabolismo , Linhagem Celular Tumoral , Desoxicitidina/metabolismo , Humanos , GencitabinaRESUMO
Cancer has the ability to escape the immune system using different molecular actors. Adenosine is known to be involved in mechanisms which control inflammatory reactions and prevent excessive immune response. This purine nucleoside can be translocated from the cell or produced in the extracellular space by 5'-ectonucleotidases. Once bound to its receptors on the surface of immune effector cells, adenosine activates various molecular pathways, which lead to functional inhibition of the cell or its death. Some tumors are infiltrated by the different cells of immune system but are able to use adenosine as an immunosuppressive molecule and thus inhibit immune anticancer response. This mechanism is well described on adaptive cells, but much less on innate cells. This review outlines major effects of adenosine on innate immune cells, its consequences on cancer progression, and possible ways to block the adenosine-dependent immunosuppressive effect.
Assuntos
Adenosina/metabolismo , Imunidade Inata/fisiologia , Inflamação/metabolismo , Neoplasias/metabolismo , Microambiente Tumoral/imunologia , Animais , Humanos , Inflamação/imunologia , Células Matadoras Naturais/imunologia , Células Matadoras Naturais/metabolismo , Macrófagos/imunologia , Macrófagos/metabolismo , Mastócitos/imunologia , Mastócitos/metabolismo , Neoplasias/imunologiaRESUMO
The nucleotide excision repair protein excision repair cross-complementation group 1 (ERCC1) has been repeatedly shown to be involved in the sensitivity of cancer cells to platinum derivatives. In order to better understand this process, we transfected HCT-116 cells with a plasmid encoding ERCC1 and studied their in vitro and in vivo behaviour. No main differences were observed for sensitivity to platinum drugs, DNA repair capacity and clonogenicity in vitro. However, -ERCC1-transfected HCT-116 cells showed paradoxical behaviour in vivo with increased growth in mice treated with oxaliplatin as compared to untreated mice. The Trop2 protein was identified as being potentially involved in the underlying mechanism for these observations, as it was overexpressed in transfected cells. Our results suggest complex regulation of signalling in cancer cells exposed to cancer drugs.
Assuntos
Antineoplásicos/farmacologia , Neoplasias Colorretais/tratamento farmacológico , Proteínas de Ligação a DNA/metabolismo , Endonucleases/metabolismo , Compostos Organoplatínicos/farmacologia , Animais , Antígenos de Neoplasias/metabolismo , Antineoplásicos/efeitos adversos , Moléculas de Adesão Celular/metabolismo , Linhagem Celular Tumoral , Proliferação de Células/efeitos dos fármacos , Cisplatino/farmacologia , Neoplasias Colorretais/enzimologia , Neoplasias Colorretais/patologia , Reparo do DNA , DNA Complementar/administração & dosagem , DNA Complementar/genética , Proteínas de Ligação a DNA/genética , Endonucleases/genética , Feminino , Humanos , Camundongos , Compostos Organoplatínicos/efeitos adversos , Oxaliplatina , Plasmídeos/administração & dosagem , Plasmídeos/genética , Transfecção , Ensaios Antitumorais Modelo de XenoenxertoRESUMO
The cytosolic 5'-nucleotidase (cN-II) has been shown to be involved in the response of cancer cells to cytotoxic agents, and the quantification of its activity in biological samples is of great interest. In this context, we developed and validated an analytical method for determination of cN-II activity in cultured cancer cells. This non-radioactive method, using a Hypercarb column as stationary phase, was validated with a lower limit of quantification of 0.1 µM inosine. We used it to characterize cell line models with modified cN-II expression obtained with stable transfections. We show that the short hairpin RNA (shRNA)-mediated inhibition of cN-II expression in various malignant blood cells is associated with decreased protein expression and enzymatic activity (1.7-6.2-fold) as well as an increased sensitivity to cytotoxic agents (up to 14-fold). On the other hand, expression of green fluorescent protein (GFP)-fused wild type or hyperactive mutant (R367Q) cN-II increased the activity and also decreased the sensitivity to nucleoside analogues. Our results confirm the biological relevance of modulating cN-II in cancer cells, and we present a straightforward validated method for the determination of cN-II activity in cellular samples.
Assuntos
5'-Nucleotidase/metabolismo , Neoplasias/enzimologia , 5'-Nucleotidase/genética , Estudos de Casos e Controles , Ciclo Celular , Cromatografia Líquida , Expressão Gênica , Humanos , Neoplasias/genética , Neoplasias/patologia , Espectrometria de Massas em Tandem , Transfecção , Células Tumorais CultivadasRESUMO
Nucleotide excision repair (NER) is involved in the repair of DNA damage caused by platinum derivatives and has been shown to decrease the cytotoxic activity of these drugs. Because protein-protein interactions are essential for NER activity, we transfected human cancer cell lines (A549 and HCT116) with plasmids coding the amino acid sequences corresponding to the interacting domains between excision repair cross-complementation group 1 (ERCC1) and xeroderma pigmentosum, complementation group A (XPA), as well as ERCC1 and xeroderma pigmentosum, complementation group F (XPF), all NER proteins. Using the 3-(4,5-dimethyl-2 thiazoyl)-2,5-diphenyl-2H-tetrazolium bromide (MTT) assay and annexin V staining, we showed that transfected A549 cells were sensitized 1.2-2.2-fold to carboplatin and that transfected HCT116 cells were sensitized 1.4-5.4-fold to oxaliplatin in vitro. In addition, transfected cells exhibited modified in vivo sensitivity to the same drugs. Finally, in particular cell models of the interaction between ERCC1 and XPF, DNA repair was decreased, as evidenced by increased phosphorylation of the histone 2AX after exposure to mitomycin C, and genomic instability was increased, as determined by comparative genomic hybridization studies. The results indicate that the interacting peptides act as dominant negatives and decrease NER activity through inhibition of protein-protein interactions.
Assuntos
Antineoplásicos/farmacologia , Reparo do DNA/genética , Instabilidade Genômica/genética , Neoplasias/tratamento farmacológico , Compostos Organoplatínicos/farmacologia , Domínios e Motivos de Interação entre Proteínas/genética , Proteínas/genética , Carboplatina/farmacologia , Linhagem Celular Tumoral , Hibridização Genômica Comparativa/métodos , Dano ao DNA/efeitos dos fármacos , Dano ao DNA/genética , Proteínas de Ligação a DNA/genética , Endonucleases/genética , Células HCT116 , Humanos , Neoplasias/genética , Oxaliplatina , Peptídeos/genética , Fosforilação/efeitos dos fármacos , Fosforilação/genética , Transfecção/métodos , Xeroderma Pigmentoso/genéticaRESUMO
The benefit of cancer chemotherapy based on alkylating agents is limited because of the action of DNA repair enzymes, which mitigate the damage induced by these agents. The interaction between the proteins ERCC1 and XPF involves two major components of the nucleotide excision repair pathway. Here, novel inhibitors of this interaction were identified by virtual screening based on available structures with use of the National Cancer Institute diversity set and a panel of DrugBank small molecules. Subsequently, experimental validation of the in silico screening was undertaken. Top hits were evaluated on A549 and HCT116 cancer cells. In particular, the compound labeled NSC 130813 [4-[(6-chloro-2-methoxy-9-acridinyl)amino]-2-[(4-methyl-1-piperazinyl)methyl]] was shown to act synergistically with cisplatin and mitomycin C; to increase UVC-mediated cytotoxicity; to modify DNA repair as indicated by the staining of phosphorylated H2AX; and to disrupt interaction between ERCC1 and XPF in cells. In addition, using the Biacore technique, we showed that this compound interacts with the domain of XPF responsible for interaction with ERCC1. This study shows that small molecules targeting the protein-protein interaction of ERCC1 and XPF can be developed to enhance the effects of alkylating agents on cancer cells.
Assuntos
Antineoplásicos Alquilantes/farmacologia , Proteínas de Ligação a DNA/antagonistas & inibidores , Proteínas de Ligação a DNA/metabolismo , Endonucleases/antagonistas & inibidores , Endonucleases/metabolismo , Domínios e Motivos de Interação entre Proteínas/efeitos dos fármacos , Bibliotecas de Moléculas Pequenas/farmacologia , Linhagem Celular Tumoral , Cisplatino/farmacologia , Quebras de DNA de Cadeia Dupla , Reparo do DNA , Sinergismo Farmacológico , Células HCT116 , Histonas/metabolismo , Humanos , Mitomicina/farmacologia , Simulação de Acoplamento Molecular , Neoplasias/tratamento farmacológico , Neoplasias/genética , Neoplasias/metabolismo , Fosforilação/efeitos dos fármacos , Ligação Proteica/efeitos dos fármacosRESUMO
Various series of 4,6-biaryl-2-thiopyridine derivatives were synthesized and evaluated as potential ecto-5'-nucleotidase (CD73) inhibitors. Two synthetic routes were explored and the coupling of 4,6-disubstituted 3-cyano-2-chloro-pyridines with selected thiols allowed us to explore the structural diversity. Somehow divergent results were obtained in biological assays on CD73 inhibition using either the purified recombinant protein or cell-based assays, highlighting the difficulty to target protein-protein interface on proteins existing as soluble and membrane-bound forms. Among the 18 new derivatives obtained, three derivatives incorporating morpholino substituents on the 4,6-biaryl-2-thiopyridine core were shown to be able to reverse the adenosine-mediated immune suppression on human T cells. The higher blockade efficiency was observed for 2-((3-cyano-4,6-bis(4-morpholinophenyl)pyridin-2-yl)thio)-N-(isoxazol-3-yl)acetamide (with total reversion at 100â µM) and methyl 2-((3-cyano-4,6-bis(4-morpholinophenyl)pyridin-2-yl)thio)acetate (with partial reversion at 10â µM). Thus, this series of compounds illustrates a new chemotype of CD73 allosteric inhibitors.
Assuntos
5'-Nucleotidase , Adenosina , Humanos , Adenosina/farmacologia , Piridinas/farmacologia , Proteínas Recombinantes/químicaRESUMO
BACKGROUND: The development of small molecules as cancer treatments is still of both interest and importance. OBJECTIVE: Having synthesized and identified the initial cytotoxic activity of a series of chemically related N-(9H-purin-6-yl) benzamide derivatives, we continued their evaluation on cancer cell models. We also synthesized water-soluble prodrugs of the main compound and performed in vivo experiments. METHOD: We used organic chemistry to obtain compounds of interest and prodrugs. The biological evaluation included MTT assays, synergy experiments, proliferation assays by CFSE, cell cycle distribution and in vivo antitumoral activity. RESULTS: Our results show activities on cancer cell lines ranging from 3-39 µM for the best compounds, with both induction of apoptosis and decrease in cell proliferation. Two compounds evaluated in vivo showed weak antitumoral activity. In addition, the lead compound and its prodrug had a synergistic activity with the nucleoside analogue fludarabine in vitro and in vivo. CONCLUSION: Our work allowed us to gain better knowledge on the activity of N-(9H-purin-6-yl) benzamide derivatives and showed new examples of water-soluble prodrugs. More research is warranted to decipher the molecular mechanisms of the molecules.
Assuntos
Antineoplásicos , Neoplasias , Pró-Fármacos , Antineoplásicos/farmacologia , Benzamidas/farmacologia , Humanos , Pró-Fármacos/farmacologia , Relação Estrutura-Atividade , ÁguaRESUMO
Extracellular adenosine is produced from ATP by CD39 and CD73, and can modulate tumor development by acting on cancer cells or immune cells. Adenosine metabolism has been poorly studied in uveal melanoma. We studied the protein levels of CD39 and CD73 in a small, well described cohort of patients with uveal melanoma. Our results show a high variability in the levels of the two proteins, both in positivity and in intensity. Our results suggest that similar studies on larger cohorts could determine the clinical value and the druggability of these enzymes in the given clinical setting.Supplemental data for this article is available online at http://dx.doi.org/10.1080/15257770.2022.2032738.
Assuntos
Apirase , Melanoma , Humanos , 5'-Nucleotidase/metabolismo , Adenosina/metabolismo , Trifosfato de Adenosina/metabolismo , Antígenos CD/metabolismo , Apirase/metabolismoRESUMO
Nucleotide metabolism has been targeted for many years and in various clinical settings, including cancer. The increased knowledge of certain enzymes involved in this metabolism and associated cellular processes accumulated over the last few years, gives important information related to the druggability of certain proteins and the use of inhibitors for others. Here, we review recent data on such enzymes with a major interest in drug development, i.e. SAMHD1 and the proteins of the NUDIX family. These include information on their roles in cancer progression, correlations with clinical outcomes in cancer patients, and the development and study of enzymatic inhibitors.
Assuntos
Neoplasias , Nucleotídeos , Inibidores Enzimáticos/farmacologia , Inibidores Enzimáticos/uso terapêutico , Humanos , Neoplasias/tratamento farmacológico , Proteína 1 com Domínio SAM e Domínio HDRESUMO
BACKGROUND: Cytosolic 5'-nucleotidase II (cN-II) and ecto-5'-nucleotidase (CD73) are enzymes involved in the nucleotide metabolism by dephosphorylating nucleoside monophosphates. Both enzymes are involved in cancer by modifying anticancer drug activity, cancer cell biology and immune modulation. METHODS: We have modified lung cancer cells (NCI-H292) to become deficient for either or both enzymes using the CRISPR/Cas9 technique, and studied the implication of the two enzymes in the cellular response to different stress condition i.e. chemotherapeutic agents, hypoxia and nucleotide stress. RESULTS: Our results show that there is no significant role of these enzymes in cell proliferation under hypoxic stress. Similarly, cN-II and CD73 are not involved in wound healing ability under CoCl2-mediated HIF-1α stabilization. Furthermore, our results show that CD73-deficiency is associated with increased apoptosis in response to 1600 µM adenosine, decreased sensitivity to mitomycin and enhanced sensitivity to vincristine. cN-II deficiency increased in vivo tumor growth and sensitivity to vincristine and mitomycin C. CONCLUSIONS: Our study gives new insights into the biological roles of cN-II and CD73 under stress conditions in this particular cancer cell line. Further experiments will help deciphering the molecular mechanisms underlying the observed differences.
Assuntos
5'-Nucleotidase/metabolismo , Adenocarcinoma de Pulmão/metabolismo , Antineoplásicos/farmacologia , Neoplasias Pulmonares/metabolismo , Hipóxia Tumoral , Adenocarcinoma de Pulmão/tratamento farmacológico , Apoptose/efeitos dos fármacos , Linhagem Celular Tumoral , Proteínas Ligadas por GPI/metabolismo , Humanos , Neoplasias Pulmonares/tratamento farmacológico , Mitomicina/farmacologia , Hipóxia Tumoral/efeitos dos fármacos , Vincristina/farmacologiaRESUMO
Enzymes of nucleoside and nucleotide metabolism regulate important cellular processes with potential impacts on nucleotide-unrelated parameters. We have used a set of CRISPR/Cas9-modified cell models expressing both, one, or none of the 5'-nucleotidases cN-II and CD73, together with RNA sequencing and targeted metabolomics, to decipher new regulatory roles of these proteins. We observed important transcriptional modifications between models as well as upon exposure to adenosine. Metabolite content varied differently between cell models in response to adenosine exposure but was rather similar in control conditions. Our original cell models allowed us to identify a new unobvious link between proteins in the nucleotide metabolism and other cellular pathways. Further analyses of our models, including additional experiments, could help us to better understand some of the roles played by these enzymes.
Assuntos
5'-Nucleotidase/deficiência , Transcrição Gênica , 5'-Nucleotidase/genética , 5'-Nucleotidase/metabolismo , Adenosina/farmacologia , Monofosfato de Adenosina/farmacologia , Linhagem Celular Tumoral , Regulação para Baixo/efeitos dos fármacos , Regulação para Baixo/genética , Perfilação da Expressão Gênica , Regulação Neoplásica da Expressão Gênica/efeitos dos fármacos , Humanos , Modelos Biológicos , RNA Mensageiro/genética , RNA Mensageiro/metabolismo , Reprodutibilidade dos Testes , Regulação para Cima/efeitos dos fármacos , Regulação para Cima/genéticaRESUMO
PURPOSE: Purine metabolism involves various intracellular and extracellular enzymes, including cN-II and CD73 that dephosphorylate intracellular and extracellular nucleoside monophosphates into their corresponding nucleosides. We conducted a study to better understand the biological roles of these enzymes in breast and lung cancer cells. METHODS: We modified cN-II and/or CD73 expression in human breast cancer cells (MDA-MB-231), human lung cancer cells (NCI-H292) and murine breast cancer cells (4T1) using the CRISPR/Cas9 technique, and evaluated their impact on various cellular parameters such as proliferation, migration, invasion, intracellular nucleotide pools and nucleotide metabolism-related gene expression under extracellular nucleotide stress conditions. RESULTS: Intracellular nucleotide contents were found to be altered in the modified cancer cell models both at their basal levels and after exposure to adenosine or AMP. Altered cN-II and CD73 levels were also found to be associated with cell migration and invasion alterations, involving TIMP-2, MMP-2 and MMP-9 expression, as well as alterations in the COX-2/PGE2/AKT pathway. CONCLUSION: Our results highlight new cell-specific roles of cN-II and CD73 in cancer cell biology and provide insight into their interactions with different intracellular pathways.
Assuntos
5'-Nucleotidase/deficiência , Neoplasias da Mama/patologia , Movimento Celular , Ciclo-Oxigenase 2/metabolismo , Dinoprostona/metabolismo , Neoplasias Pulmonares/patologia , Proteínas Proto-Oncogênicas c-akt/metabolismo , 5'-Nucleotidase/metabolismo , Adenosina/farmacologia , Animais , Neoplasias da Mama/genética , Linhagem Celular Tumoral , Movimento Celular/efeitos dos fármacos , Proliferação de Células/efeitos dos fármacos , Sobrevivência Celular/efeitos dos fármacos , Feminino , Regulação Neoplásica da Expressão Gênica/efeitos dos fármacos , Humanos , Neoplasias Pulmonares/genética , Camundongos , Modelos Biológicos , Nucleotídeos/metabolismo , RNA Mensageiro/genética , RNA Mensageiro/metabolismo , Transdução de Sinais/efeitos dos fármacosRESUMO
PURPOSE: The ERCC1-XPF 5'-3' DNA endonuclease complex is involved in the nucleotide excision repair pathway and in the DNA inter-strand crosslink repair pathway, two key mechanisms modulating the activity of chemotherapeutic alkylating agents in cancer cells. Inhibitors of the interaction between ERCC1 and XPF can be used to sensitize cancer cells to such drugs. METHODS: We tested recently synthesized new generation inhibitors of this interaction and evaluated their capacity to sensitize cancer cells to the genotoxic activity of agents in synergy studies, as well as their capacity to inhibit the protein-protein interaction in cancer cells using proximity ligation assay. RESULTS: Compound B9 showed the best activity being synergistic with cisplatin and mitomycin C in both colon and lung cancer cells. Also, B9 abolished the interaction between ERCC1 and XPF in cancer cells as shown by proximity ligation assay. Results of different compounds correlated with values from our previously obtained in silico predictions. CONCLUSION: Our results confirm the feasibility of the approach of targeting the protein-protein interaction between ERCC1 and XPF to sensitize cancer cells to alkylating agents, thanks to the improved binding affinity of the newly synthesized compounds.
Assuntos
Protocolos de Quimioterapia Combinada Antineoplásica/farmacologia , Neoplasias do Colo/tratamento farmacológico , Proteínas de Ligação a DNA/genética , Endonucleases/genética , Neoplasias Pulmonares/tratamento farmacológico , Células A549 , Protocolos de Quimioterapia Combinada Antineoplásica/administração & dosagem , Cisplatino/administração & dosagem , Neoplasias do Colo/genética , Simulação por Computador , Reparo do DNA/genética , Sinergismo Farmacológico , Células HCT116 , Humanos , Neoplasias Pulmonares/genética , Mitomicina/administração & dosagemRESUMO
Derivatives of 5'-aminoadenosine containing methyl carboxylate, methyl phosphonate, gem-bisphosphonate, bis(methylphosphonate), and α-carboxylmethylphosphonate or phosphonoacetate moieties were synthesized from key intermediate 5'-aminonucleoside. These nucleotide analogues were envisaged as 5'-mono- or diphosphate nucleoside mimics. All compounds were evaluated for CD73 inhibition in a cell-based assay (MDA-MB-231) and toward the purified recombinant protein. Most of them failed to reach significant inhibition of AMP hydrolysis by CD73 at 100â µm. Among the new compounds, the most interesting candidates, 5 (5'-deoxy-5'-N-phosphonomethyladenosine) and 7 (5'-deoxy-5'-N-(ethoxyphosphorylacetate)adenosine), inhibited recombinant CD73 by 36 and 46 % and cellular CD73 by 61 and 45 % at 100â µm, respectively. Molecular modeling partially explains this lack of activity, as the initially predicted docking scores had been encouraging, especially for compound 9.
Assuntos
5'-Nucleotidase/antagonistas & inibidores , Adenosina/análogos & derivados , Adenosina/síntese química , Antineoplásicos/síntese química , Inibidores Enzimáticos/síntese química , Adenosina/farmacologia , Antineoplásicos/farmacologia , Linhagem Celular Tumoral , Sobrevivência Celular/efeitos dos fármacos , Desenho de Fármacos , Inibidores Enzimáticos/farmacologia , Proteínas Ligadas por GPI/antagonistas & inibidores , Humanos , Modelos Moleculares , Estrutura Molecular , Organofosfonatos/química , Compostos Organofosforados/química , Ligação Proteica , Conformação Proteica , Proteínas Recombinantes/química , Relação Estrutura-AtividadeRESUMO
The ecto-5'-nucleotidase CD73 has emerged as an important drug target in oncoimmunology as well as in other diseases. We describe new ADP analogues as CD73 inhibitors based on the replacement of the adenosine moiety, in the reference inhibitor APCP, by purine nucleoside analogues. Compounds were assessed for CD73 inhibition both on purified recombinant protein and on CD73-expressing cancer cells. The clofarabine-containing compound (2) was shown to be more potent than APCP with IC50 values of 0.18⯵M (vs. 3.8⯵M) on purified protein and 0.24⯵M (vs. 23.6⯵M) on CD73 expressed on cells. This work gives additional insights into structure-activity relationship of substrate-analogues as CD73 inhibitors.
Assuntos
5'-Nucleotidase/antagonistas & inibidores , Difosfonatos/farmacologia , Inibidores Enzimáticos/farmacologia , Nucleosídeos de Purina/farmacologia , 5'-Nucleotidase/biossíntese , 5'-Nucleotidase/metabolismo , Linhagem Celular Tumoral , Sobrevivência Celular/efeitos dos fármacos , Difosfonatos/química , Relação Dose-Resposta a Droga , Inibidores Enzimáticos/síntese química , Inibidores Enzimáticos/química , Humanos , Modelos Moleculares , Estrutura Molecular , Nucleosídeos de Purina/química , Relação Estrutura-AtividadeRESUMO
Purine nucleoside analogues are widely used in the treatment of haematological malignancies, and their biological activity is dependent on the intracellular accumulation of their triphosphorylated metabolites. In this context, we developed and validated a liquid chromatography tandem mass spectrometry (LC-MS/MS) method to study the formation of 5'-triphosphorylated derivatives of cladribine, fludarabine, clofarabine and 2'-deoxyadenosine in human cancer cells. Br-ATP was used as internal standard. Separation was achieved on a hypercarb column. Analytes were eluted with a mixture of hexylamine (5 mM), DEA (0.4%, v/v, pH 10.5) and acetonitrile, in a gradient mode at a flow rate of 0.3mLmin-1. Multiple reactions monitoring (MRM) and electrospray ionization in negative mode (ESI-) were used for detection. The application of this method to the quantification of these phosphorylated cytotoxic compounds in a human follicular lymphoma cell line, showed that it was suitable for the study of relevant biological samples.