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1.
Chem Biol Interact ; 200(1): 11-20, 2012 Oct 25.
Artigo em Inglês | MEDLINE | ID: mdl-22982774

RESUMO

Licorice (LE) has been commonly used in traditional Chinese medicine (TCM) for over 4000 years to reconcile various drugs and for hepatic disorders. Glycyrrhizin is the main bioactive component isolated from LE herbs. In the present study we examined the effects of glycyrrhizin on pregnane X receptor (PXR)-mediated CYP3A expression and its hepatoprotective activity. Treatment of HepG2 cells with glycyrrhizin resulted in marked increase in both CYP3A4 mRNA and protein levels. The transcriptional activation of the CYP3A4 gene through glycyrrhizin is PXR-dependent, as shown in transient transfection experiments. Glycyrrhizin activates the DNA-binding capacity of the PXR for the CYP3A4 element responding to xenobiotic signals, as measured by the electrophoretic-mobility shift assay (EMSA). These results indicate that the induction of the hepatic CYP3A4 by glycyrrhizin is mediated through the activation of PXR. The next aim of the current study was to determine whether the activation of PXR and induction of CYP3A by glycyrrhizin prevents hepatotoxicity during cholestasis as a mechanism of hepatoprotection. Mice were pretreated with glycyrrhizin prior to induction of intrahepatic cholestasis using lithocholic acid (LCA). Pre-treatment with glycyrrhizin, as well as the PXR activator pregnenolone 16α-carbontrile (PCN), prevents the increase in plasma ALT and AST activity, multifocal necrosis and prevents an increase in a level of serum LCA level in mice, as compared with the results in the mice treated with LCA alone. Activation of the PXR by glycyrrhizin results in induction of CYP3A11 (CYP3A4 for human) expression and inhibition of CYP7A1 through an increase in small heterodimer partner (SHP) expression. Glycyrrhizin regulates the expression of the gene mentioned above to prevent toxic accumulation of bile acids in the liver and it also protects mouse livers from the harmful effects of LCA. In conclusion, PXR-mediated effects on CYP3A and CYP7A may contribute to the hepatoprotective property of glycyrrhizin against LCA-induced liver injury.


Assuntos
Doença Hepática Induzida por Substâncias e Drogas/prevenção & controle , Citocromo P-450 CYP3A/genética , Regulação da Expressão Gênica/efeitos dos fármacos , Ácido Glicirrízico/farmacologia , Ácido Litocólico/efeitos adversos , Receptores de Esteroides/metabolismo , Transcrição Gênica/efeitos dos fármacos , Animais , Doença Hepática Induzida por Substâncias e Drogas/genética , Doença Hepática Induzida por Substâncias e Drogas/metabolismo , Colestase/metabolismo , Colesterol 7-alfa-Hidroxilase/antagonistas & inibidores , Citocromo P-450 CYP3A/biossíntese , Citoproteção/efeitos dos fármacos , Relação Dose-Resposta a Droga , Indução Enzimática/efeitos dos fármacos , Células Hep G2 , Humanos , Fígado/efeitos dos fármacos , Fígado/metabolismo , Masculino , Camundongos , Receptor de Pregnano X , Regiões Promotoras Genéticas/efeitos dos fármacos , Regiões Promotoras Genéticas/genética , Receptores Citoplasmáticos e Nucleares/biossíntese , Receptores Citoplasmáticos e Nucleares/genética , Receptores de Esteroides/genética , Fatores de Tempo
2.
J Urol ; 188(1): 316-23, 2012 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-22608751

RESUMO

PURPOSE: Gender difference and nitric oxide deficiency contribute to the progression of many chronic kidney diseases. In a model of unilateral ureteral obstruction relief we analyzed the impact of biological gender and nitric oxide/cyclic guanosine monophosphate signaling stimulation on renal disease severity and restoration. MATERIALS AND METHODS: Female and male rats underwent sham surgery or unilateral ureteral obstruction. After 5-day unilateral ureteral obstruction female and male rats were assigned to obstruction relief alone or obstruction relief plus 7-day treatment with the soluble guanylate cyclase stimulator BAY 41-8543. RESULTS: Compared to male rats with obstruction relief renal disease was less severe in female rats, which had significantly less tubulointerstitial matrix accumulation and tubular atrophy. In each gender group α1 and ß1-soluble guanylate cyclase was comparably and significantly increased but female rats produced significantly more cyclic guanosine monophosphate after treatment with the soluble guanylate cyclase stimulator. In each group BAY 41-8543 treatment was associated with significant amelioration of renal matrix protein expansion, macrophage infiltration, tubular apoptosis and atrophy. CONCLUSIONS: Female gender is protective for unilateral ureteral obstruction relief. This was linked to higher sensitivity of the soluble guanylate cyclase enzyme and cyclic guanosine monophosphate production in response to BAY 41-8543. In these female and male rats enhancing the signaling of nitric oxide/cyclic guanosine monophosphate with BAY 41-8543 significantly accelerated the restoration of renal architecture after obstruction relief and largely ameliorated the differences in disease severity due to the gender disparity.


Assuntos
Regulação da Expressão Gênica , Guanilato Ciclase/genética , Rim/fisiologia , Morfolinas/uso terapêutico , Pirimidinas/uso terapêutico , RNA Mensageiro/genética , Receptores Citoplasmáticos e Nucleares/genética , Recuperação de Função Fisiológica , Obstrução Ureteral/tratamento farmacológico , Administração Oral , Animais , Apoptose , Modelos Animais de Doenças , Ensaio de Imunoadsorção Enzimática , Feminino , Guanilato Ciclase/biossíntese , Marcação In Situ das Extremidades Cortadas , Masculino , Morfolinas/administração & dosagem , Pirimidinas/administração & dosagem , Ratos , Ratos Sprague-Dawley , Receptores Citoplasmáticos e Nucleares/agonistas , Receptores Citoplasmáticos e Nucleares/biossíntese , Índice de Gravidade de Doença , Fatores Sexuais , Guanilil Ciclase Solúvel , Resultado do Tratamento , Obstrução Ureteral/patologia , Obstrução Ureteral/fisiopatologia
3.
J Immunol ; 186(7): 4467-73, 2011 Apr 01.
Artigo em Inglês | MEDLINE | ID: mdl-21357541

RESUMO

Subclinical levels of circulating endotoxin are associated with the pathogenesis of diverse human inflammatory diseases, by mildly inducing the expression of proinflammatory mediators. In this study, we examined the molecular mechanism responsible for the effect of low-dose LPS in macrophages. In contrast to high-dose LPS, which activates NF-κB and induces the robust expression of proinflammatory mediators, we observed that low-dose LPS failed to activate NF-κB. Instead, it selectively activated C/EBPδ and removed nuclear repressors, including peroxisome proliferator-activated receptor α and retinoic acid receptor α, enabling a mild and leaky expression of proinflammatory mediators. The effect of low-dose LPS required IRAK-1, which interacts with and acts upstream of IκB kinase ε to contribute to LPS-mediated induction of C/EBPδ and proinflammatory mediators. Additionally, mice fed a high-fat diet acquired elevated levels of endotoxin and proinflammatory mediators in an IRAK-1-dependent fashion. Taken together, these data reveal a distinct pathway preferentially used by low-dose endotoxin in initiating low-grade inflammation.


Assuntos
Proteína delta de Ligação ao Facilitador CCAAT/metabolismo , Mediadores da Inflamação/metabolismo , Lipopolissacarídeos/fisiologia , Macrófagos/imunologia , Macrófagos/metabolismo , Receptores Citoplasmáticos e Nucleares/antagonistas & inibidores , Animais , Células da Medula Óssea/imunologia , Células da Medula Óssea/metabolismo , Células da Medula Óssea/patologia , Proteína delta de Ligação ao Facilitador CCAAT/genética , Proteína delta de Ligação ao Facilitador CCAAT/fisiologia , Núcleo Celular/imunologia , Núcleo Celular/metabolismo , Núcleo Celular/patologia , Células Cultivadas , Relação Dose-Resposta Imunológica , Endotoxinas/fisiologia , Endotoxinas/toxicidade , Células HeLa , Humanos , Proteínas I-kappa B/metabolismo , Proteínas I-kappa B/fisiologia , Mediadores da Inflamação/fisiologia , Quinases Associadas a Receptores de Interleucina-1/deficiência , Quinases Associadas a Receptores de Interleucina-1/genética , Quinases Associadas a Receptores de Interleucina-1/fisiologia , Lipopolissacarídeos/toxicidade , Macrófagos/patologia , Camundongos , Camundongos Endogâmicos C57BL , Camundongos Knockout , NF-kappa B/metabolismo , NF-kappa B/fisiologia , Proteínas Proto-Oncogênicas/metabolismo , Proteínas Proto-Oncogênicas/fisiologia , Receptores Citoplasmáticos e Nucleares/biossíntese , Receptores Citoplasmáticos e Nucleares/metabolismo , Proteínas Repressoras/antagonistas & inibidores , Proteínas Repressoras/metabolismo , Transdução de Sinais/genética , Transdução de Sinais/imunologia
4.
Drug Metab Dispos ; 38(3): 516-25, 2010 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-20019244

RESUMO

HepaRG cells possess the unique property to differentiate in vitro and to express various functions of mature hepatocytes, including the major cytochromes P450 (P450s). In the present study, we carefully analyzed mRNA expression and activity of the major P450s and their responsiveness to three prototypical inducers, phenobarbital, rifampicin, and omeprazole, in differentiated HepaRG cell cultures over a 4-week period after low and high seeding. Only minor differences were observed in P450 activities when measured by two cocktails of probe substrates, probably related to the choice and/or concentration of substrates. Similar results were obtained from the two cell seeding conditions. Expression and activities of several P450s were dimethyl sulfoxide-dependent. However, basal P450 expression and activities as well as their responsiveness to the prototypical inducers were well maintained over the 4-week period, and a good correlation was observed between transcript levels and corresponding activities. Thus, CYP1A2, CYP2B6, and CYP3A4 were found to accurately respond to their respective prototypical inducers, i.e., omeprazole, phenobarbital, and rifampicin. Likewise, basal expression of several phase II enzymes, transporters, and nuclear receptors, and response to inducers were also well preserved. More genes were found to be induced in HepaRG cells than in primary human hepatocytes, and no marked variation was noticed between the different passages. Taken together, these data support the conclusion that HepaRG cells represent a promising surrogate to primary human hepatocytes for xenobiotic metabolism and toxicity studies.


Assuntos
Sistema Enzimático do Citocromo P-450/biossíntese , Sistema Enzimático do Citocromo P-450/metabolismo , Avaliação Pré-Clínica de Medicamentos/métodos , Indução Enzimática/efeitos dos fármacos , Regulação da Expressão Gênica/efeitos dos fármacos , Xenobióticos/metabolismo , Técnicas de Cultura de Células , Diferenciação Celular , Linhagem Celular Transformada , Células Cultivadas , Sistema Enzimático do Citocromo P-450/genética , Glucuronosiltransferase/biossíntese , Glucuronosiltransferase/genética , Glucuronosiltransferase/metabolismo , Glutationa Transferase/biossíntese , Glutationa Transferase/genética , Glutationa Transferase/metabolismo , Hepatócitos/citologia , Hepatócitos/efeitos dos fármacos , Hepatócitos/metabolismo , Humanos , Isoenzimas/biossíntese , Isoenzimas/genética , Isoenzimas/metabolismo , Proteínas de Membrana Transportadoras/biossíntese , Proteínas de Membrana Transportadoras/genética , Proteínas de Membrana Transportadoras/metabolismo , Omeprazol/farmacologia , Fenobarbital/farmacologia , RNA Mensageiro/metabolismo , Receptores Citoplasmáticos e Nucleares/biossíntese , Receptores Citoplasmáticos e Nucleares/genética , Receptores Citoplasmáticos e Nucleares/metabolismo , Reprodutibilidade dos Testes , Rifampina/farmacologia , Fatores de Tempo
5.
Hepatology ; 49(1): 151-9, 2009 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-19111018

RESUMO

UNLABELLED: The farnesoid X receptor/retinoid X receptor-alpha (FXR/RXRalpha) complex regulates bile salt homeostasis, in part by modulating transcription of the bile salt export pump (BSEP/ABCB11) and small heterodimer partner (SHP/NR0B2). FXR is activated by bile salts, RXRalpha by the vitamin A derivative 9-cis retinoic acid (9cRA). Cholestasis is associated with vitamin A malabsorption. Therefore, we evaluated the role of vitamin A/9cRA in the expression of human and mouse bile salt export pump (hBSEP/mBsep), small heterodimer partner (hSHP/mShp), and mouse sodium-dependent taurocholate co-transporting polypeptide (mNtcp). HBSEP and hSHP transcription were analyzed in FXR/RXRalpha-transfected HepG2 cells exposed to chenodeoxycholic acid (CDCA) and/or 9cRA. BSEP promoter activity was determined by luciferase reporter assays, DNA-binding of FXR and RXRalpha by pull-down assays. Serum bile salt levels and hepatic expression of Bsep, Shp, and Ntcp were determined in vitamin A-deficient (VAD)/cholic acid (CA)-fed C57BL/6J mice. Results indicated that 9cRA strongly repressed the CDCA-induced BSEP transcription in HepG2 cells, whereas it super-induced SHP transcription; 9cRA reduced DNA-binding of FXR and RXRalpha. The 9cRA repressed the CDCA-induced BSEP promoter activity irrespective of the exact sequence of the FXR-binding site. In vivo, highest Bsep messenger RNA (mRNA), and protein expression was observed in CA-fed VAD mice. Shp transcription was highest in CA-fed vitamin A-sufficient mice. Ntcp protein expression was strongly reduced in CA-fed VAD mice, whereas mRNA levels were normal. CA-fed control and VAD mice had similarly increased serum bile salt levels. CONCLUSION: We showed that 9cRA has opposite effects on bile salt-activated transcription of FXR/RXRalpha target genes. Vitamin A deficiency in CA-fed mice leads to high BSEP expression. Clearance of serum bile salts may, however, be limited because of post-transcriptional reduction of Ntcp. The molecular effects of vitamin A supplementation during cholestasis need further analysis to predict a therapeutic effect.


Assuntos
Transportadores de Cassetes de Ligação de ATP/biossíntese , Ácido Quenodesoxicólico/farmacologia , Proteínas de Ligação a DNA/fisiologia , Receptores Citoplasmáticos e Nucleares/biossíntese , Receptores Citoplasmáticos e Nucleares/fisiologia , Receptor X Retinoide alfa/fisiologia , Fatores de Transcrição/fisiologia , Tretinoína/farmacologia , Vitamina A/farmacologia , Membro 11 da Subfamília B de Transportadores de Cassetes de Ligação de ATP , Alitretinoína , Animais , Carcinoma Hepatocelular , Linhagem Celular Tumoral , Ácido Cólico/farmacologia , Proteínas de Ligação a DNA/genética , Regulação da Expressão Gênica/efeitos dos fármacos , Humanos , Masculino , Camundongos , Camundongos Endogâmicos C57BL , Transportadores de Ânions Orgânicos Dependentes de Sódio/biossíntese , Receptores Citoplasmáticos e Nucleares/genética , Elementos de Resposta , Simportadores/biossíntese , Fatores de Transcrição/genética , Vitamina A/administração & dosagem , Deficiência de Vitamina A/fisiopatologia
6.
PLoS One ; 3(9): e3266, 2008 Sep 25.
Artigo em Inglês | MEDLINE | ID: mdl-18815614

RESUMO

BACKGROUND: The mammalian neocortex is subdivided into many areas, each of which exhibits distinctive lamina architecture. To investigate such area differences in detail, we chose three genes for comparative analyses, namely, RORbeta, ER81 and Nurr1, mRNAs of which have been reported to be mainly expressed in layers 4, 5 and 6, respectively. To analyze their qualitative and quantitative coexpression profiles in the rat neocortex, we used double in situ hybridization (ISH) histochemistry and cortical box method which we previously developed to integrate the data of different staining and individuals in a standard three-dimensional space. PRINCIPAL FINDINGS: Our new approach resulted in three main observations. First, the three genes showed unique area distribution patterns that are mostly complementary to one another. The patterns revealed by cortical box method matched well with the cytoarchitectonic areas defined by Nissl staining. Second, at single cell level, RORbeta and ER81 mRNAs were coexpressed in a subpopulation of layer 5 neurons, whereas Nurr1 and ER81 mRNAs were not colocalized. Third, principal component analysis showed that the order of hierarchical processing in the cortex correlates well with the expression profiles of these three genes. Based on this analysis, the dysgranular zone (DZ) in the somatosensory area was considered to exhibit a profile of a higher order area, which is consistent with previous proposal. CONCLUSIONS/SIGNIFICANCE: The tight relationship between the expression of the three layer specific genes and functional areas were revealed, demonstrating the usefulness of cortical box method in the study on the cerebral cortex. In particular, it allowed us to perform statistical evaluation and pattern matching, which would become important in interpreting the ever-increasing data of gene expression in the cortex.


Assuntos
Proteínas de Ligação a DNA/biossíntese , Regulação da Expressão Gênica , Neocórtex/metabolismo , Receptores Citoplasmáticos e Nucleares/biossíntese , Transativadores/biossíntese , Fatores de Transcrição/biossíntese , Animais , Primers do DNA/química , DNA Complementar/metabolismo , Processamento de Imagem Assistida por Computador , Hibridização In Situ , Masculino , Camundongos , Membro 2 do Grupo F da Subfamília 1 de Receptores Nucleares , Membro 2 do Grupo A da Subfamília 4 de Receptores Nucleares , RNA Mensageiro/metabolismo , Ratos , Receptores Citoplasmáticos e Nucleares/genética , Distribuição Tecidual
7.
Dev Dyn ; 236(9): 2694-701, 2007 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-17685489

RESUMO

Mouse genetic studies have identified several genes involved in cerebellar development. The mouse mutants staggerer and lurcher are functionally deficient for the retinoid-related orphan receptor alpha (ROR alpha) and glutamate receptor delta2 (Grid2) genes, respectively, and they show similar functional and developmental abnormalities in the cerebellum. Here, we report the cloning and expression pattern of zebrafish ROR alpha orthologues rora1 and rora2, and compare their expression pattern with that of grid2. Expression of rora1 and rora2 is initiated at late gastrula and pharyngula stages, respectively. Both rora1 and rora2 are spatially expressed in the retina and tectum. Expression of rora2 was further observed in the cerebellum, as reported for mammalian ROR alpha. In the adult brain, rora2 and grid2 are coexpressed in brain regions, designated as cerebellar-like structures. These observations suggest an evolutionarily conserved function of ROR alpha orthologues in the vertebrate brain.


Assuntos
Regulação da Expressão Gênica no Desenvolvimento , Receptores Citoplasmáticos e Nucleares/biossíntese , Proteínas de Peixe-Zebra/biossíntese , Sequência de Aminoácidos , Animais , Sequência de Bases , Cerebelo/embriologia , Clonagem Molecular , DNA Complementar/metabolismo , Éxons , Perfilação da Expressão Gênica , Dados de Sequência Molecular , Filogenia , Receptores de Glutamato/metabolismo , Homologia de Sequência de Aminoácidos , Peixe-Zebra
8.
Zhong Xi Yi Jie He Xue Bao ; 4(3): 303-6, 2006 May.
Artigo em Chinês | MEDLINE | ID: mdl-16696921

RESUMO

OBJECTIVE: To investigate the effects of soybean isoflavones (SI) on expression levels of osteoprotegerin (OPG) and osteoprotegerin ligand (OPGL) mRNAs in bone tissues of ovariectomized rats, and to discuss the mechanism of soybean isoflavaones in preventing and treating postmenopausal osteoporosis (PMO). METHODS: Thirty adult SD rats were randomly divided into 3 groups: sham-operation group, untreated group and SI-treated group. The rats in the last two groups were bilaterally ovariectomized. The bone density of L(3) to L(6) vertebrae was detected after 12-week intervention. Total RNA was extracted from femur head and the expression levels of OPG and OPGL mRNAs were examined by real-time quantitative polymerase chain reaction. RESULTS: SI could increase the bone density of lumbar vertebrae in ovariectomized rats, up-regulate the expression level of OPG mRNA and down-regulate the ratio of OPGL mRNA/OPG mRNA, but exert no significant effect on the expression of OPGL mRNA. CONCLUSION: The therapeutic effects of SI on PMO may be related to regulating the expression levels of OPG and OPGL mRNAs, and the ratio of OPGL mRNA/OPG mRNA.


Assuntos
Proteínas de Transporte/biossíntese , Glycine max/química , Glicoproteínas/biossíntese , Isoflavonas/farmacologia , Glicoproteínas de Membrana/biossíntese , Receptores Citoplasmáticos e Nucleares/biossíntese , Receptores do Fator de Necrose Tumoral/biossíntese , Animais , Densidade Óssea , Osso e Ossos/metabolismo , Proteínas de Transporte/genética , Feminino , Glicoproteínas/genética , Glicoproteínas de Membrana/genética , Osteoprotegerina , Ovariectomia , Ligante RANK , RNA Mensageiro/biossíntese , RNA Mensageiro/genética , Distribuição Aleatória , Ratos , Ratos Sprague-Dawley , Receptores Citoplasmáticos e Nucleares/genética , Receptores do Fator de Necrose Tumoral/genética
9.
Zhong Xi Yi Jie He Xue Bao ; 4(3): 307-10, 2006 May.
Artigo em Chinês | MEDLINE | ID: mdl-16696922

RESUMO

OBJECTIVE: To observe the effects of Kangfengshi Granules (KFSG) on expressions of the mRNAs of osteoprotegerin (OPG), receptor activator of nuclear factor-kappaB ligand (RANKL) and macrophage colony stimulating factor (M-CSF) in bone tissues of rats with collagen-induced arthritis. METHODS: Forty SD rats were randomly divided into four groups: normal control group, untreated group, cyclosporine A (CsA)-treated group and KFSG-treated group. Except the rats in the normal control group, all the other rats received subcutaneous injection of collagen II to establish collagen-induced arthritis (CIA) models. Then the rats in each group were fed normal saline or corresponding drugs for four weeks. Total RNA was extracted from carpal and digital bones. The expressions of OPG, RANKL and M-CSF mRNAs were examined by real-time PCR. RESULTS: The total incidence of arthritis induced by collagen II in the rats was approximately 90%. The expression levels of RANKL and M-CSF mRNAs and the RANKL mRNA/OPG mRNA ratio in the untreated group, KFSG-treated group and CsA-treated group were all significantly higher than those in the normal control group, while the expression levels of OPG mRNA in those three groups were significantly lower than that in the normal control group. The expression level of OPG mRNA in the KFSG-treated group was obviously higher while the expression level of M-CSF mRNA and the RANKL mRNA/OPG mRNA ratio in the same group were both lower as compared with those in the untreated group. CONCLUSION: The molecular mechanism of effects of KFSG on bone erosion and destruction induced by rheumatoid arthritis is closely correlated with up-regulating the expression of OPG mRNA, down-regulating the expression of M-CSF mRNA and RANKL mRNA/OPG mRNA ratio.


Assuntos
Artrite Experimental/tratamento farmacológico , Glicoproteínas/biossíntese , Fator Estimulador de Colônias de Macrófagos/biossíntese , Fitoterapia , Receptores Citoplasmáticos e Nucleares/biossíntese , Receptores do Fator de Necrose Tumoral/biossíntese , Animais , Artrite Experimental/induzido quimicamente , Artrite Experimental/metabolismo , Colágeno Tipo II , Medicamentos de Ervas Chinesas/farmacologia , Medicamentos de Ervas Chinesas/uso terapêutico , Feminino , Glicoproteínas/genética , Fator Estimulador de Colônias de Macrófagos/genética , Masculino , Osteoprotegerina , RNA Mensageiro/biossíntese , RNA Mensageiro/genética , Distribuição Aleatória , Ratos , Ratos Sprague-Dawley , Receptores Citoplasmáticos e Nucleares/genética , Receptores do Fator de Necrose Tumoral/genética
10.
Zhongguo Zhong Yao Za Zhi ; 31(6): 487-90, 2006 Mar.
Artigo em Chinês | MEDLINE | ID: mdl-16722381

RESUMO

OBJECTIVE: To explore the effect of Herba Epimedii flavone (HEF) on the osteoblast metabolism in vitro. METHOD: Osteoblast were obtained from new born rat calvaria by digestive enzymes. MTF, PNPP and RT-PCR were used to observe the proliferation, activity of ALP and mRNA expression of OPG and RANKL of cultured osteoblasts in vitro. RESULT: It was found that HEF had the effect on stimulating cell proliferation, activity of ALP and the mRNA expression of OPG of cultured osteoblasts (P < 0.01, P < 0.05). CONCLUSION: HEF can promote the proliferation, the differentiation and the expression of OPG mRNA of the osteoblasts cultured in vitro.


Assuntos
Epimedium , Flavonas/farmacologia , Glicoproteínas/biossíntese , Osteoblastos/metabolismo , Receptores Citoplasmáticos e Nucleares/biossíntese , Receptores do Fator de Necrose Tumoral/biossíntese , Fosfatase Alcalina/metabolismo , Animais , Animais Recém-Nascidos , Proteínas de Transporte/biossíntese , Proteínas de Transporte/genética , Proliferação de Células/efeitos dos fármacos , Células Cultivadas , Epimedium/química , Flavonas/isolamento & purificação , Glicoproteínas/genética , Glicoproteínas de Membrana/biossíntese , Glicoproteínas de Membrana/genética , Osteoblastos/citologia , Osteoprotegerina , Plantas Medicinais/química , Ligante RANK , RNA Mensageiro/biossíntese , RNA Mensageiro/genética , Ratos , Ratos Sprague-Dawley , Receptores Citoplasmáticos e Nucleares/genética , Receptores do Fator de Necrose Tumoral/genética
11.
Arthritis Rheum ; 54(5): 1463-72, 2006 May.
Artigo em Inglês | MEDLINE | ID: mdl-16646024

RESUMO

OBJECTIVE: Intraarticular corticosteroids are frequently used as successful adjuvant therapy for inflammatory arthritides, but little is known about their effects on molecules that regulate bone biology. We undertook this study to investigate the effect of intraarticular corticosteroids on the synovial expression of RANKL and osteoprotegerin (OPG). METHODS: We evaluated RANKL, OPG, and surface marker expression by immunohistochemical methods in synovial knee biopsy samples obtained from 13 patients with inflammatory arthritis before and 2 weeks following intraarticular injection of triamcinolone hexacetonide. We further investigated the effect of dexamethasone (DEX) on RANKL expression by lymphocytes from rheumatoid arthritis synovial fluids (RA SF), using flow cytometric analysis. Finally, we evaluated the in vitro effect of DEX on RANKL and OPG expression in osteoblast-like cells, by Western blotting. RESULTS: Intraarticular corticosteroids induced a decrease in the number of synovial T cells without influencing the number of macrophages, evaluated as both CD68+ and CD163+ cells. This change was paralleled by a decrease of synovial RANKL expression with a concomitant reduction of the RANKL:OPG ratio. DEX down-regulated RANKL expression on lymphocytes derived from RA SF. Moreover, in vitro pretreatment of osteoblast-like cells with tumor necrosis factor favored an antiresorptive effect of DEX treatment through a similar down-regulation of RANKL expression. CONCLUSION: The decrease in inflammation attributed to intraarticular corticosteroids is accompanied by down-modulation of bone destruction markers. These findings offer a rationale for the beneficial effect of corticosteroids on joint erosion in arthritis.


Assuntos
Corticosteroides/administração & dosagem , Anti-Inflamatórios/administração & dosagem , Artrite/tratamento farmacológico , Artrite/metabolismo , Proteínas de Transporte/biossíntese , Glicoproteínas/biossíntese , Glicoproteínas de Membrana/biossíntese , Receptores Citoplasmáticos e Nucleares/biossíntese , Receptores do Fator de Necrose Tumoral/biossíntese , Membrana Sinovial/metabolismo , Triancinolona Acetonida/análogos & derivados , Adulto , Idoso , Idoso de 80 Anos ou mais , Células Cultivadas , Feminino , Humanos , Injeções Intra-Articulares , Masculino , Pessoa de Meia-Idade , Osteoprotegerina , Ligante RANK , Receptor Ativador de Fator Nuclear kappa-B , Membrana Sinovial/patologia , Triancinolona Acetonida/administração & dosagem
12.
Lasers Med Sci ; 21(1): 24-33, 2006 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-16568210

RESUMO

Low-energy laser irradiation (Ga-Al-As semiconductor laser, output 50 mW) was applied to rat osteoclast precursor cells for 1, 3, 6, or 10 min at 24-h intervals during the culture period. The number of tartrate-resistant acid phosphatase positive multinucleate cells was increased by approximately 1.3-fold in the 3- and 6-min irradiation groups. Further, osteoclasts appeared on day 2 in the laser irradiation groups but not until day 3 in the control groups. In immunohistochemical staining for receptor activator of NF-kappaB (RANK), the laser irradiation groups showed significantly greater amounts of staining in comparison with the control group on days 2 and 3. Reverse transcription-polymerase chain reaction results also showed that the expressions of RANK were upregulated. In the pit formation assay, resorption pits were significantly more abundant in the laser irradiation groups than in the controls. The present results suggest that low-energy laser irradiation facilitates differentiation and activation of osteoclasts via RANK expression.


Assuntos
Glicoproteínas/biossíntese , Terapia com Luz de Baixa Intensidade , Osteoclastos/metabolismo , Osteoclastos/efeitos da radiação , Receptores Citoplasmáticos e Nucleares/biossíntese , Receptores do Fator de Necrose Tumoral/biossíntese , Animais , Células Cultivadas , Osteoprotegerina , Ratos , Células-Tronco
13.
Pharm Res ; 23(1): 56-69, 2006 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-16328606

RESUMO

PURPOSE: The aim of the study was to investigate the feasibility of predicting human in vivo cytochrome P450 (CYP) induction properties of drugs using in vitro methods. METHODS: The CYP induction potential of compounds was tested in human liver slices and in reporter gene assays for the aryl hydrocarbon receptor (AhR) and the pregnane X receptor (PXR). RESULTS: In human liver slices, CYP activities decreased dramatically over the experimental period, whereas mRNA levels could reliably be used to investigate CYP1A, 2C9, and 3A4 induction. However, the interindividual variations and demanding experimentation limit the use of liver slices in screening programs. Reporter gene assays are robust and reliable assays, amenable to high throughput screening. Several compounds activated AhR. The relevance of this activation, however, needs to be further investigated since there are no clear reports on drugs inducing CYP1A in vivo. The results from the PXR assay could be used to correctly classify compounds with known CYP3A induction properties when relating in vivo AUCtot to PXR EC50 values. CONCLUSIONS: Liver slices are a valuable model to study the regulation of a larger number of enzymes by single compounds. The PXR reporter gene assay could be used as a reliable screening method to predict CYP3A induction in vivo.


Assuntos
Sistema Enzimático do Citocromo P-450/biossíntese , Sistema Enzimático do Citocromo P-450/genética , Indução Enzimática/efeitos dos fármacos , Genes Reporter/genética , Fígado/enzimologia , Idoso , Linhagem Celular , Sobrevivência Celular , Estudos de Avaliação como Assunto , Feminino , Humanos , Fígado/efeitos dos fármacos , Masculino , Pessoa de Meia-Idade , Técnicas de Cultura de Órgãos , Preparações de Plantas/farmacologia , Valor Preditivo dos Testes , Receptor de Pregnano X , RNA/biossíntese , RNA/genética , Receptores de Hidrocarboneto Arílico/biossíntese , Receptores de Hidrocarboneto Arílico/genética , Receptores Citoplasmáticos e Nucleares/biossíntese , Receptores Citoplasmáticos e Nucleares/genética , Receptores de Esteroides/biossíntese , Receptores de Esteroides/genética , Reação em Cadeia da Polimerase Via Transcriptase Reversa
14.
Toxicology ; 216(2-3): 147-53, 2005 Dec 15.
Artigo em Inglês | MEDLINE | ID: mdl-16153763

RESUMO

The expression of the CAR gene and inducibility of CYP2B protein in the liver of male Wistar rats treated with phenobarbital (PB) and triphenyldioxane (TPD) were investigated. To clarify the role of phosphorylation/dephosphorylation in these processes, rats were treated with inhibitors of Ca(2+)/calmodulin-dependent kinase II (W7) or protein phosphatases PP1 and PP2A (OA) before induction. Constitutive expression of the CAR gene in livers of untreated rats was detected by multiplex RT-PCR. Treatment with W7 resulted in a 2.8-fold induction of CAR gene expression, whereas OA led to a 2.4-fold decrease of the mRNA level. The same results were obtained for CYP2B genes expression, which were increased by W7 treatment (two-fold) and decreased by OA (2.3-fold). PB-induction did not lead to significant alteration in the level of CAR gene expression, although CYP2B genes expression was enhanced two-fold over control values. TPD caused a two-fold increase of both CAR and CYP2B mRNA levels. Both inducers reduced the effects of inhibitors on CAR gene expression. Results of EMSA showed that PB, TPD or W7 alone induced formation of complexes of NR1 with nuclear proteins. Appearance of the complexes correlated with an increase in CYP2B expression, and their intensities were modulated by the protein kinase inhibitors. Thus, our results demonstrate that constitutive expressions of CAR as well as CYP2B during induction are regulated by phosphorylation/dephosphorylation processes.


Assuntos
Citocromo P-450 CYP2B1/biossíntese , Sistema Enzimático do Citocromo P-450/biossíntese , Sistema Enzimático do Citocromo P-450/genética , Fígado/enzimologia , Fenobarbital/farmacologia , Receptores Citoplasmáticos e Nucleares/genética , Fatores de Transcrição/genética , Animais , Western Blotting/métodos , Proteínas Quinases Dependentes de Cálcio-Calmodulina/antagonistas & inibidores , Receptor Constitutivo de Androstano , Citocromo P-450 CYP2B1/antagonistas & inibidores , Citocromo P-450 CYP2B1/genética , Inibidores das Enzimas do Citocromo P-450 , DNA Complementar/biossíntese , Dioxanos/farmacologia , Eletroforese em Gel de Poliacrilamida , Ensaio de Desvio de Mobilidade Eletroforética/métodos , Ativadores de Enzimas/farmacologia , Indução Enzimática/efeitos dos fármacos , Gliceraldeído-3-Fosfato Desidrogenases/genética , Fígado/efeitos dos fármacos , Masculino , Proteínas Nucleares/isolamento & purificação , Proteínas Nucleares/metabolismo , Fosforilação/efeitos dos fármacos , Isoformas de Proteínas , Inibidores de Proteínas Quinases/farmacologia , RNA Mensageiro/isolamento & purificação , Ratos , Ratos Wistar , Receptores Citoplasmáticos e Nucleares/antagonistas & inibidores , Receptores Citoplasmáticos e Nucleares/biossíntese , Reação em Cadeia da Polimerase Via Transcriptase Reversa/métodos , Sulfonamidas/farmacologia , Fatores de Transcrição/antagonistas & inibidores , Fatores de Transcrição/biossíntese
15.
J Clin Periodontol ; 32(4): 353-9, 2005 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-15811051

RESUMO

OBJECTIVES: Areca chewers have a higher prevalence of periodontal diseases than non-chewers. This study was to determine the possible effects of ripe areca nut extracts (rANE) on viability and gene expression of alkaline phosphatase (ALP), receptor activator of nuclear factor-kappaB ligand (RANKL) and osteoprotegerin (OPG) in human osteoblasts. METHODS: The effects of rANE on cell viability of osteoblast-like MG63 cells were determined using 3-[4,5-dimethylthiazol-2-yl]-2,5 diphenyltetrazolium bromide (MTT) that measures metabolic activity. Gene expression of ALP, RANKL and OPG was examined using reverse transcription-polymerase chain reaction. ALP activity and RANKL protein were further examined using substrate assay and confocal laser scanning microscopy, respectively. RESULTS: Relative viability was reduced to approximately 50% when 25 microg/ml of rANE was used. The expression of OPG mRNA in MG63 cells was not altered by rANE. However, decreased levels of mRNA and enzyme activity of ALP were observed. Moreover, the expressions of mRNA and protein of RANKL were stimulated by rANE in a dose-dependent manner. CONCLUSIONS: The rANE affected morphology and viability of osteoblasts. We also present novel evidence demonstrating that areca nut may compromise the periodontal health of areca chewers by suppression of ALP gene expression and elevation of RANKL gene expression in osteoblasts.


Assuntos
Fosfatase Alcalina/efeitos dos fármacos , Areca , Proteínas de Transporte/efeitos dos fármacos , Glicoproteínas de Membrana/efeitos dos fármacos , Osteoblastos/efeitos dos fármacos , Extratos Vegetais/farmacologia , Receptores do Fator de Necrose Tumoral/efeitos dos fármacos , Fosfatase Alcalina/biossíntese , Proteínas de Transporte/biossíntese , Forma Celular/efeitos dos fármacos , Sobrevivência Celular/efeitos dos fármacos , Células Cultivadas , Expressão Gênica/efeitos dos fármacos , Glicoproteínas/biossíntese , Humanos , Glicoproteínas de Membrana/biossíntese , Microscopia Confocal , Osteoprotegerina , Ligante RANK , Receptor Ativador de Fator Nuclear kappa-B , Receptores Citoplasmáticos e Nucleares/biossíntese , Reação em Cadeia da Polimerase Via Transcriptase Reversa
16.
Zhong Yao Cai ; 28(12): 1076-8, 2005 Dec.
Artigo em Chinês | MEDLINE | ID: mdl-16568663

RESUMO

OBJECTIVE: To explore the effect of Herba Epimedii Flavone (HEF) on expression of OPG and RANKL in rat osteoblasts. METHODS: Osteoblasts were obtained from new born rat calvaria by digestive enzymes. The different HEF concentrations (0.1, 1, 10, 100 ng/ml)were added into the culture medium. Total mRNA was prepared from osteoblasts after 48 h and 96 h, and mRNA expression of OPG and RANKL were detected by RT-PCR. RESULTS: The mRNA expression of OPG in osteoblasts significantly increased compared with that of the control group, and the V(OPF)/V(RANKL) ratio was deceased markedly in the treatment of 10 ng/ml group after 48 h. After 96 h, the mRNA expression of OPG significantly increased and the V(OPG)/V(RANKL) ratio was also decreased in the treatment group compared with that of the control group. CONCLUSION: HEF suppress the differentiation and maturate of osteoblast. Osteoporosis can be prevented and cured by HEF.


Assuntos
Proteínas de Transporte/biossíntese , Epimedium/química , Flavonas/farmacologia , Glicoproteínas/biossíntese , Glicoproteínas de Membrana/biossíntese , Osteoblastos/metabolismo , Plantas Medicinais/química , Receptores Citoplasmáticos e Nucleares/biossíntese , Receptores do Fator de Necrose Tumoral/biossíntese , Animais , Proteínas de Transporte/genética , Diferenciação Celular/efeitos dos fármacos , Células Cultivadas , Flavonas/isolamento & purificação , Glicoproteínas/genética , Glicoproteínas de Membrana/genética , Osteoblastos/citologia , Osteoblastos/efeitos dos fármacos , Osteoclastos/efeitos dos fármacos , Osteoprotegerina , Ligante RANK , RNA Mensageiro/biossíntese , RNA Mensageiro/genética , Ratos , Ratos Sprague-Dawley , Receptores Citoplasmáticos e Nucleares/genética , Receptores do Fator de Necrose Tumoral/genética , Fatores de Tempo
17.
Gastroenterology ; 127(3): 777-91, 2004 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-15362034

RESUMO

BACKGROUND & AIMS: The molecular targets for the protective actions of conjugated linoleic acid (CLA) on experimental inflammatory bowel disease (IBD) are unknown. We used a loss-of-function approach to investigate whether CLA ameliorated colitis through a peroxisome proliferator-activated receptor gamma (PPAR gamma)-dependent mechanism. METHODS: The expression of PPAR gamma, delta, and their target genes in the colon of mice fed control or CLA-supplemented diets was assayed after a 7-day dextran sodium sulfate (DSS) challenge by quantitative real-time polymerase chain reaction (PCR). Additionally, nuclear factor-kappa B (NF-kappaB) p65 activation was quantified in the colon. To determine the involvement of PPAR gamma in the mechanism of action of CLA directly, specific deletions of PPAR gamma in the colon were performed in mice by using the Cre-lox recombination system. Colonic PPAR gamma null mice and wild-type littermates were fed either a CLA-supplemented or a control diet for 42 days and challenged with 2.5% DSS. The therapeutic efficacy of CLA also was examined by using the CD4 + CD45RB hi transfer colitis model. RESULTS: CLA induced PPAR gamma and delta, transcriptionally modulated PPAR gamma and delta-responsive gene clusters involved in lipid metabolism (uncoupling protein [UCP]1, UCP3, PPAR gamma coactivator 1alpha [PGC-1alpha], and CD36) and epithelial cell maturation (Gob-4 and Keratin 20). Additionally, CLA repressed tumor necrosis factor alpha (TNF-alpha) expression and NF-kappaB activation while inducing the immunoregulatory cytokine transforming growth factor beta 1 (TGF-beta 1 ). Clinically, CLA ameliorated DSS- and CD4 + -induced colitis. Loss of the PPAR gamma gene in the colon abrogated the beneficial effects of CLA in DSS colitis. CONCLUSIONS: Our studies provide molecular evidence in vivo, suggesting that CLA ameliorates colitis through a PPAR gamma-dependent mechanism.


Assuntos
Doenças Inflamatórias Intestinais/imunologia , Ácidos Linoleicos Conjugados/imunologia , Receptores Citoplasmáticos e Nucleares/biossíntese , Fatores de Transcrição/biossíntese , Animais , Proteínas de Transporte/imunologia , Regulação da Expressão Gênica/imunologia , Doenças Inflamatórias Intestinais/dietoterapia , Ácidos Linoleicos Conjugados/genética , Camundongos , Camundongos Endogâmicos C57BL , Modelos Animais , NF-kappa B/imunologia , Proteínas de Neoplasias/imunologia , Receptores Citoplasmáticos e Nucleares/genética , Receptores Citoplasmáticos e Nucleares/imunologia , Fator de Transcrição RelA , Fatores de Transcrição/genética , Fatores de Transcrição/imunologia
18.
Biol Pharm Bull ; 27(9): 1406-13, 2004 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-15340228

RESUMO

Kanzo-bushi-to (KBT) is a traditional Japanese herbal medicine (Kampo medicine), which is used in Japan to treat rheumatoid arthritis. In the present study, we investigated the suppressive effect of KBT on collagen-induced arthritis (CIA) and further studied the underlying mechanism. CIA was induced in male DBA/1J mice by immunization with bovine type II collagen, followed by a booster injection 21 d later. KBT was given at a dose of 430 mg/kg/d from three days before the first immunization to the end of the experiment. KBT suppressed CIA development effectively and further protected focal bone erosion and bone destruction as evidenced by the reduced histological score. Histochemical examination revealed that KBT decreased TRAP-positive cells at the synovium-bone interface and at the sites of focal bone erosion, coincident with the findings that RANKL/OPG mRNA ratio was significantly reduced by KBT treatment. KBT also decreased mRNA levels of M-CSF and iNOS in joints and of iNOS in peritoneal macrophages. In conclusion, KBT prevented osteoclast generation by decreasing RANKL/OPG ratio and M-CSF mRNA levels, resulting in reduction in bone erosion and destruction. In addition, KBT has anti-inflammatory effect such as the suppression of iNOS expression in peritoneal macrophages and joints of CIA mice. These finding suggests that KBT is a potential new therapeutic agent for the treatment of RA.


Assuntos
Antirreumáticos/farmacologia , Artrite Experimental/tratamento farmacológico , Medicamentos de Ervas Chinesas/farmacologia , Medicina Kampo , Animais , Artrite Experimental/patologia , Proteínas de Transporte/biossíntese , Citocinas/biossíntese , Glicoproteínas/biossíntese , Japão , Articulações/metabolismo , Articulações/patologia , Macrófagos Peritoneais/metabolismo , Masculino , Glicoproteínas de Membrana/biossíntese , Camundongos , Camundongos Endogâmicos DBA , Óxido Nítrico/biossíntese , Óxido Nítrico Sintase/antagonistas & inibidores , Óxido Nítrico Sintase Tipo II , Osteoprotegerina , Ligante RANK , Receptor Ativador de Fator Nuclear kappa-B , Receptores Citoplasmáticos e Nucleares/biossíntese , Receptores do Fator de Necrose Tumoral
19.
Wei Sheng Yan Jiu ; 33(3): 307-9, 2004 May.
Artigo em Chinês | MEDLINE | ID: mdl-15211799

RESUMO

OBJECTIVE: In order to study the effect of conjugated linoleic acid on PPAR gamma gene expression, serum leptin, blood glucose and blood lipid level. METHODS: Five groups of male Wistar rats were randomly selected and fed with different diets (basic diet, high-fat diet, high-fat with 0.75% CLA, high-fat with 1.50% CLA, and high-fat with 3.00% CLA) for 12 weeks. At the end of experiment, the rats were sacrificed, the ratio of lipids to body weight were calculated, and the blood glucose, serum lipids, serum leptin were measured. RT-PCR was used for measuring the expression of PPAR gamma mRNA in white adipose tissue of rats. RESULTS: It was shown that the supplement of CLA could decrease decreased blood glucose, serum triglyceride, cholesterol and leptin levels, and increased the expression of PPAR gamma in white adipose tissue of obese rat. CONCLUSION: CLA could decrease blood glucose, serum lipids, and decrease the levels of leptin possibly via activating peroxisome proliferator--activated receptor gamma (PPAR gamma), resulting in the improvement of leptin resistance of obese rat.


Assuntos
Leptina/sangue , Ácidos Linoleicos Conjugados/farmacologia , Obesidade/genética , Receptores Citoplasmáticos e Nucleares/biossíntese , Fatores de Transcrição/biossíntese , Tecido Adiposo/metabolismo , Animais , Colesterol/sangue , Masculino , Obesidade/sangue , Obesidade/metabolismo , RNA Mensageiro/biossíntese , RNA Mensageiro/genética , Ratos , Ratos Wistar , Receptores Citoplasmáticos e Nucleares/genética , Reação em Cadeia da Polimerase Via Transcriptase Reversa , Fatores de Transcrição/genética , Triglicerídeos/sangue
20.
Neuro Endocrinol Lett ; 24(1-2): 33-8, 2003.
Artigo em Inglês | MEDLINE | ID: mdl-12743529

RESUMO

OBJECTIVES: The pineal gland transduces photoperiodic informations to the neuroendocrine axis through the nocturnally melatonin secretion. This hormonal message plays a major role in the biological rhythm regulation. By autoradiography, more than 130 melatonin putative targets have been reported in the central nervous system (CNS) and in peripheral tissues. However, cross-species consensus concern only a few of them like the suprachiasmatic nuclei (SCN), the master circadian clock, and the pars tuberalis of the pituitary. Recently, MT1 melatonin receptor cDNA have been cloned in several mammals providing us with new tools to investigate its tissular location at the gene level. In the present study, we report a screening for MT1 mRNA by RT-PCR amplification of numerous tissue mRNA. METHOD: mRNA were extracted from a large variety of rat tissues. To semi-quantify the melatonin receptor mRNA expression level, each cDNA was amplified concomitantly with both beta-actin and MT1 specific primers. RESULTS: In central and peripheral tissues previously reported to bind melatonin, strong PCR signals were logically observed. More surprisingly, a vast majority of studied tissues express MT1 mRNA and then might be responsive to melatonin. CONCLUSION: Numerous biological functions express diurnal rhythmicity and internal-synchronization. As, most of them apparently do not receive any out-coming neuronal message from the SCN, endocrine communication was proposed to support biological rhythm synchronization. Our present data strengthen the idea that the nocturnally restricted melatonin secretion could be one internal zeitgeber that putatively distributes the endogenous circadian rhythmicity to all tissues expressing melatonin receptors.


Assuntos
RNA Mensageiro/biossíntese , Receptores de Superfície Celular/biossíntese , Receptores Citoplasmáticos e Nucleares/biossíntese , Actinas/biossíntese , Actinas/genética , Animais , Elementos Antissenso (Genética) , Autorradiografia , DNA Complementar/biossíntese , DNA Complementar/isolamento & purificação , Masculino , Ratos , Ratos Wistar , Receptores de Melatonina , Reação em Cadeia da Polimerase Via Transcriptase Reversa , Distribuição Tecidual
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