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1.
Genes Cells ; 18(2): 110-22, 2013 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-23279183

RESUMO

The specificities of nine approved tyrosine kinase inhibitors (imatinib, dasatinib, nilotinib, gefitinib, erlotinib, lapatinib, sorafenib, sunitinib, and pazopanib) were determined by activity-based kinase profiling using a large panel of human recombinant active kinases. This panel consisted of 79 tyrosine kinases, 199 serine/threonine kinases, three lipid kinases, and 29 disease-relevant mutant kinases. Many potential targets of each inhibitor were identified by kinase profiling at the K(m) for ATP. In addition, profiling at a physiological ATP concentration (1 mm) was carried out, and the IC(50) values of the inhibitors against each kinase were compared with the estimated plasma-free concentration (calculated from published pharmacokinetic parameters of plasma C(trough) and C(max) values). This analysis revealed that the approved kinase inhibitors were well optimized for their target kinases. This profiling also implicates activity at particular off-target kinases in drug side effects. Thus, large-scale kinase profiling at both K(m) and physiological ATP concentrations could be useful in characterizing the targets and off-targets of kinase inhibitors.


Assuntos
Inibidores de Proteínas Quinases/farmacologia , Proteínas Quinases/metabolismo , Proteoma , Trifosfato de Adenosina/metabolismo , Ativação Enzimática/efeitos dos fármacos , Perfilação da Expressão Gênica , Humanos , Concentração Inibidora 50 , Cinética , Mutação , Filogenia , Ligação Proteica , Inibidores de Proteínas Quinases/farmacocinética , Proteínas Quinases/classificação , Proteínas Quinases/genética , Reprodutibilidade dos Testes
2.
Biochem Biophys Res Commun ; 400(3): 369-73, 2010 Sep 24.
Artigo em Inglês | MEDLINE | ID: mdl-20732303

RESUMO

MKK4 activates both JNKs and p38s. We determined the crystal structures of human non-phosphorylated MKK4 kinase domain (npMKK4) complexed with AMP-PNP (npMKK4/AMP) and a ternary complex of npMKK4, AMP-PNP and p38α peptide (npMKK4/AMP/p38). These crystal structures revealed that the p38α peptide-bound npMKK4 at the allosteric site rather than at the putative substrate binding site and induced an auto-inhibition state. While the activation loop of the npMKK4/AMP complex was disordered, in the npMKK4/AMP/p38 complex it configured a long α-helix, which prevented substrate access to the active site and αC-helix movement to the active configuration of MKK4.


Assuntos
Sítio Alostérico , MAP Quinase Quinase 4/antagonistas & inibidores , MAP Quinase Quinase 4/química , Proteínas Quinases p38 Ativadas por Mitógeno/química , Monofosfato de Adenosina/química , Regulação Alostérica , Domínio Catalítico , Cristalografia por Raios X , Humanos , Peptídeos/química , Dobramento de Proteína , Estrutura Secundária de Proteína , Estrutura Terciária de Proteína , Especificidade por Substrato
3.
Bioorg Med Chem Lett ; 20(5): 1776-8, 2010 Mar 01.
Artigo em Inglês | MEDLINE | ID: mdl-20117931

RESUMO

Conformationally constrained peptide libraries have been made by grafting randomized amino acid sequences onto a rigid scaffold derived from natural proteins. Here, as a library scaffold, we propose a de novo designed helix-loop-helix motif. We constructed a peptide library of the loop region and screened against Aurora-A, which is a member of the Aurora family of serine/threonine protein kinases, to successfully isolate the inhibitory peptides. A semi-rational strategy, which combines phage-displayed libraries and de novo designed peptides, would provide a new way to generate selective peptide inhibitors for the protein kinase family.


Assuntos
Peptídeos/química , Inibidores de Proteínas Quinases/química , Proteínas Serina-Treonina Quinases/antagonistas & inibidores , Sequência de Aminoácidos , Aurora Quinases , Sequências Hélice-Alça-Hélice , Humanos , Dados de Sequência Molecular , Biblioteca de Peptídeos , Peptídeos/síntese química , Peptídeos/farmacologia , Inibidores de Proteínas Quinases/síntese química , Inibidores de Proteínas Quinases/farmacologia , Proteínas Serina-Treonina Quinases/metabolismo
4.
Biosci Biotechnol Biochem ; 74(1): 125-8, 2010.
Artigo em Inglês | MEDLINE | ID: mdl-20057140

RESUMO

Fyn-related kinase (Frk) was first identified using human breast cancer cells. It shares 51% identity with c-Src. Like all members of the Src family, Frk is thought to cause several cancers via dysregulations in signal transduction from cell-surface receptors. The excess activity of Frk on beta-cells has a crucial role in type-I diabetes. A silent mutation at Ile229 conferred a bacterial expression system on the kinase domains of Frk, which allowed for the quick expression and purification of one unphosphorylated and two mono-phosphorylated kinase domains. The C-terminal catalytic segment of the human Frk kinase conjugating hexahistidine purification tag (His-tag) was expressed in Escherichia coli. After first-step purification utilizing the His-tag, an anion-exchange chromatogram yielded three major peaks that had distinguishable phosphorylation characteristics as judged by Western blot analysis and measurement of kinase activity. This result of active protein production should promote drug discovery studies, including highthrough-put screening and structure-based drug design.


Assuntos
Escherichia coli/genética , Mutação , Proteínas de Neoplasias/biossíntese , Proteínas de Neoplasias/metabolismo , Engenharia de Proteínas/métodos , Proteínas Tirosina Quinases/biossíntese , Proteínas Tirosina Quinases/metabolismo , Cromatografia por Troca Iônica , Expressão Gênica , Humanos , Proteínas de Neoplasias/genética , Proteínas de Neoplasias/isolamento & purificação , Fosforilação , Proteínas Tirosina Quinases/genética , Proteínas Tirosina Quinases/isolamento & purificação
5.
Bioorg Med Chem Lett ; 19(23): 6557-60, 2009 Dec 01.
Artigo em Inglês | MEDLINE | ID: mdl-19857964

RESUMO

Human Lyn tyrosine kinase is expressed in hematopoietic tissues and plays crucial roles in the signal transduction of hematopoietic immune system. Its excess activity is involved in several tumors. The crystal structure has revealed that the potent inhibitor staurosporine binds to human Lyn kinase domain at the ATP-binding site. The remarkable structural features of the staurosporine-binding region will offer valuable structural insights for the structure-based design of novel Lyn-selective inhibitors.


Assuntos
Inibidores de Proteínas Quinases/química , Inibidores de Proteínas Quinases/farmacologia , Estaurosporina/química , Estaurosporina/farmacologia , Quinases da Família src/antagonistas & inibidores , Quinases da Família src/química , Sítios de Ligação , Cristalografia por Raios X , Desenho de Fármacos , Humanos , Modelos Moleculares , Estrutura Molecular , Relação Estrutura-Atividade
6.
Biochem Biophys Res Commun ; 377(4): 1123-7, 2008 Dec 26.
Artigo em Inglês | MEDLINE | ID: mdl-18983981

RESUMO

Extracellular signal-regulated kinase (ERK) is a member of the MAP kinase family, and can regulate several cellular responses. The isoforms ERK1 and ERK2 have markedly similar amino acid sequences, but exhibit distinctive physiological functions. As well as ERK2, ERK1 was auto- and mono-phosphorylated at Tyr204 in the activation loop during Escherichia coli production, resulting in basal level activity, approximately 500-fold less compared with fully-active ERK1 dual-phosphorylated at Thr202 and Tyr204. Crystal structure demonstrated that the mono-phosphorylated ERK1 kinase possessed a novel conformation distinguishable from the un-phosphorylated (inactive) and the dual-phosphorylated (full-active) forms. The characteristic structural features in both the C-helix and the activation loop likely contribute to the basal activity of the mono-phosphorylated ERK1. The structural dissection of ERK1 compared to ERK2 suggests that the structural differences in the D-motif binding site and in the backside binding site are putative targets for development of selective ERK1/ERK2 inhibitors.


Assuntos
Proteína Quinase 3 Ativada por Mitógeno/química , Tirosina/química , Sítios de Ligação , Cristalização , Cristalografia por Raios X , Ativação Enzimática , Humanos , Proteína Quinase 1 Ativada por Mitógeno/química , Proteína Quinase 1 Ativada por Mitógeno/metabolismo , Proteína Quinase 3 Ativada por Mitógeno/metabolismo , Fosforilação , Estrutura Secundária de Proteína , Tirosina/metabolismo
7.
Protein Expr Purif ; 58(2): 318-24, 2008 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-18272395

RESUMO

Lyn is a member of the Src family of non-receptor protein kinase. As well as all members of the Src family, Lyn is thought to participate in signal transduction from cell surface receptors. The crystal structure of Lyn would have a better understanding of Lyn function in various cells. For the purpose of crystallization, C-terminal catalytic segment of human Lyn kinase conjugating hexahistidine purification tag (His-tag) was expressed in Sf21 insect cells. After first step purification utilizing His-tag, an anion-exchange chromatogram yielded four major peaks which had distinguishable phosphorylation manner as judged by Western blot analysis, Native-PAGE analysis and kinase activity measurements. The fractioned samples were separately examined for crystallization screening using a commercial available screening kit. The mono-phosphorylated protein was crystallized with a small rod-shaped and needle clusters. The higher phosphorylated samples corresponding to the other three fractions on the anion-exchange chromatogram were aggregated or precipitated under the above conditions. A crystal of the mono-phosphorylated sample was diffracted to 3.2A with synchrotron source at Photon Factory and a complete X-ray diffraction data set was collected. The coarse structure was solved by a molecular replacement method and further structural refinement is currently underway.


Assuntos
Quinases da Família src/química , Quinases da Família src/isolamento & purificação , Western Blotting , Cromatografia por Troca Iônica , Cristalização , Cristalografia por Raios X , Eletroforese em Gel de Poliacrilamida , Humanos , Proteínas Recombinantes/química , Proteínas Recombinantes/isolamento & purificação
8.
J Dermatol Sci ; 42(1): 23-9, 2006 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-16364600

RESUMO

BACKGROUND: The basic function of epithelia is to provide a boundary between tissue and its external environment, and is achieved by a wide variety of components including extracellular molecules. Multiple monoclonal antibodies raised against epithelial antigens have helped identify a range of distinct, novel protein epitopes. OBJECT: In this study, we raised a monoclonal antibody to detect a novel epithelial molecular component. METHODS: We have produced a mouse monoclonal antibody using normal human amniotic tissue as an immunogen. The monoclonal antibody was subsequently immunohistochemically screened, and the target antigen was cloned using an immunoscreening method. RESULT: In the course of the screening, we identified unique antibody staining patterns within the cytoplasm of a subset of amniotic cells at intervals within the normal placental epithelia. By immunoscreening, we identified this candidate gene as laminin receptor (LR). By dot blot analysis, this antibody reacted with recombinant LR. The same localization of the antigen and LR was proved by a double staining immunofluorescence test in the placenta. This monoclonal antibody unexpectedly demonstrated linear staining within the dermal-epidermal junction of normal human skin but failed to react within the keratinocyte cytoplasm. CONCLUSION: We have produced and characterized a novel monoclonal antibody 29A that recognizes an LR-related molecule, which demonstrated a unique staining pattern. This monoclonal antibody might be a useful tool for further investigations into the epithelial tissues and the cutaneous basement membrane (BM).


Assuntos
Âmnio/química , Receptores de Laminina/análise , Pele/química , Anticorpos Monoclonais , Membrana Basal/química , Clonagem Molecular , Citoplasma/química , Células Epiteliais/química , Feminino , Humanos , Imuno-Histoquímica , Gravidez , Receptores de Laminina/genética , Receptores de Laminina/imunologia
9.
J Bone Miner Res ; 18(6): 975-83, 2003 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-12817749

RESUMO

The in vivo effects of IL-18 on bone metabolism were investigated by histopathology in IL-18 transgenic mice. Deformed cortical bone and decreased turnover rate of lumbar trabecular bone are consistent with increased expression of IFN-gamma and IL-18 in the bone marrow. Interleukin (IL)-18 has been demonstrated to inhibit osteoclastogenesis in an in vitro co-culture system. We investigated the effects of IL-18 overexpression on bone metabolism by comparing bone characteristics in male IL-18 transgenic (TG) mice, which secrete mature murine IL-18 from their B- and T-cells, and their wildtype littermates (WT). Histopathological analysis revealed that the cortical bone of the femur was thinner and more deformed in IL-18 TG mice. Bone histomorphometry showed that the cortical bone area of the mid-diaphysis of the femur and the trabecular bone volume of the lumbar vertebrae were significantly reduced in IL-18 TG mice. IL-18 TG mice also exhibited significantly fewer osteoclasts and a reduced bone formation rate in the trabecular bones of their lumbar vertebrae. Real-time reverse transcriptase-polymerase chain reaction amplification of bone marrow cell mRNA revealed that interferon (IFN)-gamma mRNA expression was significantly increased, whereas IL-4 mRNA expression was significantly reduced, in IL-18 TG mice. However, the expression ratio of receptor activator of NFkappaB ligand and osteoprotegerin mRNA was not significantly altered. Thus, deformed cortical bone and a decreased turnover rate of lumbar trabecular bone are characteristic of IL-18 TG mice, and these features might be associated with the increased expression of IFN-gamma and IL-18 in the bone marrow.


Assuntos
Osso e Ossos/anormalidades , Interleucina-18/fisiologia , Animais , Linfócitos B/imunologia , Sequência de Bases , Densidade Óssea , Cruzamentos Genéticos , Primers do DNA , Fêmur/patologia , Glicoproteínas/genética , Humanos , Interferon gama/genética , Interleucina-18/genética , Interleucina-18/farmacologia , Masculino , Camundongos , Camundongos Endogâmicos C57BL , Camundongos Transgênicos , Osteoclastos/citologia , Osteoclastos/efeitos dos fármacos , Osteoprotegerina , RNA Mensageiro/genética , Receptores Citoplasmáticos e Nucleares/genética , Receptores do Fator de Necrose Tumoral , Valores de Referência , Reação em Cadeia da Polimerase Via Transcriptase Reversa , Linfócitos T/imunologia , Transcrição Gênica
10.
J Invest Dermatol ; 118(6): 967-71, 2002 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-12060390

RESUMO

The expression of intradermally injected DNA by keratinocytes is found mainly in the upper and middle layers of the epidermis. To investigate the mechanism of this selective expression, we observed the sequential changes in the distribution of interleukin-6-expressing keratinocytes after the introduction of the interleukin-6 gene. Transgene expression first occurred in basal keratinocytes and subsequently expanded to all epidermal layers and then remained in the upper layers. Semiquantitative analysis indicated that keratinocytes in the lower layers incorporated and lost DNA earlier than those in the upper layers. In order to examine the effect of the DNA size on the transgene expression, we constructed a plasmid containing a full-length 9 kb cDNA of type VII collagen and introduced it into keratinocytes. The expression pattern of type VII collagen in the epidermis was the same as those for smaller genes. This suggests that plasmid size has little or no effect on the expression pattern of the transfected gene. To trace the introduced plasmid, we intradermally injected a green fluorescence protein expression plasmid coupled with a rhodamine flag. Almost all keratinocytes in the injected areas showed rhodamine fluorescence. Furthermore, some cells also expressed green fluorescence protein. A lack of rhodamine fluorescence in the nucleus suggested an impairment of plasmid DNA transport from the cytoplasm to the nucleus. Collectively, our results show that the majority of keratinocytes take up the intradermally injected DNA regardless of its size, but that the transfer of DNA from the cytoplasm to the nucleus is limiting the transgene expression.


Assuntos
Terapia Genética/métodos , Queratinócitos/fisiologia , Plasmídeos/farmacocinética , Animais , Colágeno Tipo VII/genética , Células Epidérmicas , Expressão Gênica/fisiologia , Humanos , Injeções Intradérmicas , Queratinócitos/citologia , Plasmídeos/genética , Ratos , Ratos Endogâmicos , Transgenes/genética
11.
J Invest Dermatol ; 121(3): 502-9, 2003 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-12925208

RESUMO

Interleukin 18 induces both T helper 1 and T helper 2 cytokines, proinflammatory cytokines, chemokines, and IgE and IgG1 production. A role of interleukin 18 in inflammatory cutaneous reactions is still unclear, however. Here we generated keratin 5/interleukin 18 transgenic mice overexpressing mature murine interleukin 18 in the skin using a human keratin 5 promoter. In the contact hypersensitivity model, trinitrochlorobenzene elicited a stronger ear swelling in keratin 5/interleukin 18 transgenic mice compared with control littermate wild-type or immunoglobulin/interleukin 18 transgenic mice in which mature interleukin 18 was expressed by B and T cells under the control of the immunoglobulin promoter. Application of an irritant, croton oil, induced stronger and more sustained ear swelling in keratin 5/interleukin 18 transgenic mice than in immunoglobulin/interleukin 18 transgenic or wild-type mice. Repetitive topical application (weekly for six consecutive weeks) of trinitrochlorobenzene to their ears also elicited a stronger cutaneous inflammation in keratin 5/interleukin 18 transgenic mice than seen in immunoglobulin/interleukin 18 transgenic or wild-type mice. After these six trinitrochlorobenzene applications, the expression of interferon-gamma, interleukin-4, and CCL20 mRNA in the ear tissue was increased and dermal changes, such as acanthosis and eosinophilic, neutrophilic, and mast cell infiltration, were greater in keratin 5/interleukin 18 transgenic mice than in wild-type mice. Furthermore, the repetitive application elicited a significant increase in serum IgE levels and the number of B cells in the draining lymph node in keratin 5/interleukin 18 transgenic mice. These results suggest that overexpression of interleukin 18 in the skin aggravates allergic and nonallergic cutaneous inflammation, which is accompanied by high expression of T helper 1 and T helper 2 cytokines and chemokines in the skin.


Assuntos
Dermatite Alérgica de Contato/imunologia , Dermatite Alérgica de Contato/fisiopatologia , Interleucina-18/genética , Interleucina-18/imunologia , Pele/imunologia , Animais , Linhagem da Célula/imunologia , Quimiocinas/genética , Óleo de Cróton , Citocinas/genética , Dermatite Alérgica de Contato/patologia , Orelha Externa , Feminino , Expressão Gênica/imunologia , Irritantes , Queratina-15 , Queratina-5 , Queratinócitos/patologia , Queratinócitos/fisiologia , Queratinas/genética , Linfonodos/citologia , Linfonodos/imunologia , Masculino , Camundongos , Camundongos Endogâmicos C57BL , Camundongos Knockout , Cloreto de Picrila , Regiões Promotoras Genéticas , RNA Mensageiro/análise , Pele/patologia
12.
J Med Chem ; 45(4): 930-6, 2002 Feb 14.
Artigo em Inglês | MEDLINE | ID: mdl-11831905

RESUMO

Phosphonamide-based inhibitors were synthesized and evaluated for the inhibitory activities against the shedding of epidermal growth factors, amphiregulin and heparin-binding EGF-like growth factor, that would participate in the development of psoriasis. All compounds exhibited excellent inhibitory activities for these EGF sheddings; however, they also inhibited matrix metalloproteinases (MMPs). To avoid adverse effects reported by the clinical development of MMP inhibitors, the antedrug concept was introduced. Among the phosphonamide inhibitors, the 2,2,2-trifluoroethyl ester 8d and 2,2-difluoroethyl ester 8c showed rapid decomposition in human plasma, which is an essential property for the antedrug. Topical applications of these compounds significantly suppressed TPA-induced epidermal hyperplasia in murin skin, a model of psoriasis. These results suggested that the phosphonamide-based inhibitors have a therapeutic potential for the treatment of psoriasis as an antedrug application.


Assuntos
Hidroxilaminas/síntese química , Peptídeos e Proteínas de Sinalização Intercelular , Isoquinolinas/síntese química , Metaloendopeptidases/antagonistas & inibidores , Inibidores de Proteases/síntese química , Tetra-Hidroisoquinolinas , Anfirregulina , Animais , Linhagem Celular , Modelos Animais de Doenças , Estabilidade de Medicamentos , Família de Proteínas EGF , Fator de Crescimento Epidérmico/antagonistas & inibidores , Glicoproteínas/antagonistas & inibidores , Substâncias de Crescimento , Fator de Crescimento Semelhante a EGF de Ligação à Heparina , Humanos , Hidroxilaminas/sangue , Hidroxilaminas/farmacologia , Hiperplasia/induzido quimicamente , Isoquinolinas/sangue , Isoquinolinas/farmacologia , Espectroscopia de Ressonância Magnética , Inibidores de Metaloproteinases de Matriz , Camundongos , Inibidores de Proteases/sangue , Inibidores de Proteases/farmacologia , Psoríase/induzido quimicamente , Psoríase/patologia , Proteínas Recombinantes/química , Pele/efeitos dos fármacos , Pele/patologia , Acetato de Tetradecanoilforbol
13.
J Dermatol Sci ; 35(3): 215-20, 2004 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-15381243

RESUMO

BACKGROUND: Oculocutaneous albinism (OCA) is a heterogeneous congenital disorder. Tyrosinase is a key enzyme in melanin biosynthesis, and tyrosinase gene mutations cause the OCA1 subtype. OBJECTIVE: This study was intended evaluate the frequency and details of tyrosinase gene mutations in Japanese OCA patients. PATIENTS AND METHODS: We examined nine non-consanguineous OCA families, sequenced the tyrosinase gene of the patients and also confirmed a splicing site mutation using exon trapping system. RESULTS: Tyrosinase gene mutations were identified in five out of nine OCA families (55%). IVS2-10deltt-7t-a was present in 3 out of 18 alleles in three families (16%), P310insC was present in three alleles in three families (16%) and R278X was found in three alleles (16%), including those in one heterozygous and one compound homozygous patient. G97V (290 G-T) was found in 1 out of 18 alleles, and we could not find G97V in the mutation database. We have added this mutation as 9th mutation of Japanese OCA1 patients. In 8 of 18 alleles, four families, no tyrosinase mutations were identified. They were presumed not to be OCA1, but other subtypes of OCA. Exon trapping system demonstrated IVS2-10deltt-7t-a mutation generated the abnormal splicing site, and inserted the codon 4 bases in mRNA level resulting in premature termination codon downstream. CONCLUSION: This study provided new information about OCA1 mutations, and highlights the requirement of broader detailed search to make precise diagnosis of OCA.


Assuntos
Albinismo Oculocutâneo/genética , Monofenol Mono-Oxigenase/genética , Adolescente , Criança , Bases de Dados Genéticas , Cor de Olho/genética , Feminino , Humanos , Lactente , Recém-Nascido , Japão , Masculino , Mutação , Pigmentação da Pele/genética
14.
J Biochem ; 151(5): 541-9, 2012 May.
Artigo em Inglês | MEDLINE | ID: mdl-22383536

RESUMO

Mitogen-activated protein kinase kinase 6 (MAP2K6) plays a crucial role in the p38 MAP kinase signal cascade that regulates various stress-induced responses and is associated with pathological conditions. The crystal structure of human non-phosphorylated MAP2K6 (npMAP2K6) complexed with an ATP analogue was determined at 2.6 Å resolution and represents an auto-inhibition state of MAP2K6. Three characteristics of short α-helices configured in the activation loop region, termed activation helices (AH1, AH2 and AH3), are important in controlling the auto-inhibition mechanism. AH1 displaces the αC-helix, a component essential for forming the active configuration, away from the active site. AH1 and AH2 were found to enclose the γ-phosphate, the leaving group of ATP. A comparison with the related enzymes, MAP2K1 and MAP2K4 reveals that MAP2K6 has the unique auto-inhibition mechanism mediated by the three activation helices.


Assuntos
MAP Quinase Quinase 6/antagonistas & inibidores , MAP Quinase Quinase 6/química , Cristalografia por Raios X , Humanos , MAP Quinase Quinase 6/metabolismo , Modelos Moleculares , Conformação Proteica , Relação Estrutura-Atividade
15.
J Biochem ; 151(1): 47-55, 2012 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-21880693

RESUMO

It is known that some kinase inhibitors are sensitive to the phosphorylation state of the kinase, and therefore those compounds can discriminate between a phosphorylated and unphosphorylated protein. In this study, we prepared two colony stimulating factor-1 receptor (CSF-1R) tyrosine kinase proteins: one highly phosphorylated by autophosphorylation and the other dephosphorylated by phosphatase treatment. These kinases were subjected to an activity-based assay to investigate the effect of their phosphorylation state on the potency of several kinase inhibitors. Dasatinib, sorafenib, PD173074 and staurosporine showed similar inhibition against different phosphorylation states of CSF-1R, but pazopanib, sunitinib, GW2580 and imatinib showed more potent inhibition against dephosphorylated CSF-1R. Binding analysis of the inhibitors to the two different phosphorylation forms of CSF-1R, using surface plasmon resonance spectrometry, revealed that staurosporine bound to both forms with similar affinity, but sunitinib bound to the dephosphorylated form with higher affinity. Thus, these observations suggest that sunitinib binds preferentially to the inactive form, preventing the activation of CSF-1R. Screening against different activation states of kinases should be an important approach for prioritizing compounds and should facilitate inhibitor design.


Assuntos
Inibidores de Proteínas Quinases/metabolismo , Inibidores de Proteínas Quinases/farmacologia , Receptor de Fator Estimulador de Colônias de Macrófagos/antagonistas & inibidores , Receptor de Fator Estimulador de Colônias de Macrófagos/metabolismo , Animais , Benzamidas , Benzenossulfonatos/metabolismo , Benzenossulfonatos/farmacologia , Ligação Competitiva , Linhagem Celular , Dasatinibe , Relação Dose-Resposta a Droga , Humanos , Mesilato de Imatinib , Indazóis , Indóis/metabolismo , Indóis/farmacologia , Cinética , Niacinamida/análogos & derivados , Compostos de Fenilureia , Fosforilação , Piperazinas/metabolismo , Piperazinas/farmacologia , Piridinas/metabolismo , Piridinas/farmacologia , Pirimidinas/metabolismo , Pirimidinas/farmacologia , Pirróis/metabolismo , Pirróis/farmacologia , Receptor de Fator Estimulador de Colônias de Macrófagos/genética , Sorafenibe , Spodoptera , Estaurosporina/metabolismo , Estaurosporina/farmacologia , Sulfonamidas/metabolismo , Sulfonamidas/farmacologia , Sunitinibe , Ressonância de Plasmônio de Superfície , Tiazóis/metabolismo , Tiazóis/farmacologia , Transfecção
19.
PLoS One ; 5(10): e13447, 2010 Oct 18.
Artigo em Inglês | MEDLINE | ID: mdl-20976192

RESUMO

BACKGROUND: Diacylglycerol kinase (DGK) is an enzyme that phosphorylates diacylglycerol (DG) to produce phosphatidic acid (PA). DGKß is widely distributed in the central nervous system, such as the olfactory bulb, cerebral cortex, striatum, and hippocampus. Recent studies reported that the splice variant at the COOH-terminal of DGKß was related to bipolar disorder, but its detailed mechanism is still unknown. METHODOLOGY/PRINCIPAL FINDINGS: In the present study, we performed behavioral tests using DGKß knockout (KO) mice to investigate the effects of DGKß deficits on psychomotor behavior. DGKß KO mice exhibited some behavioral abnormalities, such as hyperactivity, reduced anxiety, and reduced depression. Additionally, hyperactivity and reduced anxiety were attenuated by the administration of the mood stabilizer, lithium, but not haloperidol, diazepam, or imipramine. Moreover, DGKß KO mice showed impairment in Akt-glycogen synthesis kinase (GSK) 3ß signaling and cortical spine formation. CONCLUSIONS/SIGNIFICANCE: These findings suggest that DGKß KO mice exhibit lithium-sensitive behavioral abnormalities that are, at least in part, due to the impairment of Akt-GSK3ß signaling and cortical spine formation.


Assuntos
Comportamento Animal/efeitos dos fármacos , Diacilglicerol Quinase/metabolismo , Compostos de Lítio/farmacologia , Animais , Western Blotting , Diacilglicerol Quinase/genética , Quinase 3 da Glicogênio Sintase/metabolismo , Glicogênio Sintase Quinase 3 beta , Aprendizagem em Labirinto , Camundongos , Camundongos Knockout , Fosforilação , Proteínas Proto-Oncogênicas c-akt/metabolismo , Desempenho Psicomotor/efeitos dos fármacos
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