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1.
Dev Sci ; : e13388, 2023 Mar 17.
Artigo em Inglês | MEDLINE | ID: mdl-36929667

RESUMO

This study compared parenting across four non-Western cultures to test cross-cultural commonality and specificity principles in three aspects: measurement properties, parenting normativeness, and their associations with child outcomes. Both mothers and fathers (N = 1509 dyads) with preschool-aged children (M = 5.00 years; 48% girls) from urban areas of four countries (Malaysia, N = 372; China, N = 441; Turkey, N = 402; and Japan, N = 294) reported on four parenting constructs (authoritative, authoritarian, group harmony socialization, and intrusive control) and their sub-dimensions using modified culturally relevant measures. Teachers reported on children's internalizing, externalizing, and prosocial behaviors. The commonality principle was supported by two sets of findings: (1) full measurement invariance was established for most parenting constructs and sub-dimensions, except that intrusive control only reached partial scalar invariance, and (2) no variations were found in associations between parenting and any child outcomes across cultures or parent gender at the construct level for all four parenting constructs and at the sub-dimensional level for authoritarian and intrusive control sub-dimensions. The specificity principle was supported by the other two sets of findings: (1) cross-cultural differences in parenting normativeness did not follow the pattern of economic development but yielded culture-specific patterns, and (2) at the sub-dimensional level, the authoritative parenting and group harmony socialization sub-dimensions were differently associated with child outcomes across cultures and/or parent gender. The findings suggested that examining specific dimensions rather than broad parenting constructs is necessary to reflect cultural specificities and nuances. Our study provided a culturally-invariant instrument and a three-step guide for future parenting research to examine cross-cultural commonalities/specificities. RESEARCH HIGHLIGHTS: This is the first study to use an instrument with measurement invariance across multiple non-Western cultures to examine the commonality and specificity principles in parenting. Measurement invariance was achieved across cultures for authoritative and authoritarian parenting, group harmony socialization, intrusive control, and their sub-dimensions, supporting the commonality principle. Cross-cultural differences in parenting normativeness did not follow the pattern of economic development but yielded culture-specific patterns, supporting the specificity principle. Both commonalities and specificities were manifested in associations between parenting and child outcomes across cultures.

2.
Gan To Kagaku Ryoho ; 42(5): 581-3, 2015 May.
Artigo em Japonês | MEDLINE | ID: mdl-25981651

RESUMO

Afatinib is an epidermal growth factor receptor-tyrosine kinase inhibitor(EGFR-TKI). In a randomized phase III study(Lux- Lung 3 study)employing patients harboring EGFR mutations, patients administered afatinib show a significantly longer progression free survival time(PFS)than those administeredcombination chemotherapy comprising cisplatin andpemetrexed . However, most of the patients(95.2%)treatedwith afatinib experiencedd iarrhea. In the present report, 16 patients with EGFR mutations were treatedby afatinib at our institution from May 2014 to December 2014. Twelve patients were administered a diarrhea prevention herbal medicine, Hange-shashin-to. Seven of 12 patients(58%)had no diarrhea during the 28 days of therapy. All 4 of the patients who did not receive Hange-shashin-to experienced diarrhea above Grade 1 within 6 days of starting therapy. The rate of diarrhea differed significantly between the patients receiving and not receiving Hangeshashin- to. In conclusion, preventive administration of Hange-shashin-to may reduce the occurrence of diarrhea during afatinib treatment.


Assuntos
Antineoplásicos/efeitos adversos , Carcinoma Pulmonar de Células não Pequenas/tratamento farmacológico , Diarreia/prevenção & controle , Medicamentos de Ervas Chinesas/uso terapêutico , Neoplasias Pulmonares/tratamento farmacológico , Quinazolinas/efeitos adversos , Afatinib , Idoso , Antineoplásicos/uso terapêutico , Carcinoma Pulmonar de Células não Pequenas/genética , Receptores ErbB/genética , Feminino , Humanos , Neoplasias Pulmonares/genética , Masculino , Pessoa de Meia-Idade , Quinazolinas/uso terapêutico
3.
Int Arch Allergy Immunol ; 161 Suppl 2: 10-5, 2013.
Artigo em Inglês | MEDLINE | ID: mdl-23711848

RESUMO

BACKGROUND: Neutrophils are often increased in the airways of either chronic severe asthma or acute exacerbations. Neutrophils that have migrated in response to interleukin-8 (IL-8) may lead eosinophils to accumulate in the airways of patients with asthma and possibly aggravate the disease. In this study, we investigated whether formoterol modified the trans-basement membrane migration (TBM) of eosinophils stimulated with neutrophils and IL-8. METHODS: Neutrophils and eosinophils were isolated from peripheral blood obtained from healthy donors. Eosinophil TBM was examined using a modified Boyden's chamber technique. Neutrophils were preincubated with or without formoterol (0.1 µM) at 37°C for 30 min. Eosinophils were added to the upper compartment of a chamber with a Matrigel-coated transwell insert. Medium containing preincubated neutrophils and IL-8 was added to the lower compartment of the chamber. After a 90-minute incubation, the eosinophils that had migrated into the lower chamber were calculated using eosinophil peroxidase assays. RESULTS: A combination of neutrophils and IL-8 significantly induced the eosinophil TBM; formoterol alone had no effect. However, formoterol modestly but significantly attenuated the TBM of eosinophils stimulated with neutrophils and IL-8. CONCLUSION: These results suggest that formoterol may act as a therapeutic agent on enhanced eosinophilic inflammation in acute exacerbation or persistent, severe asthma. The effect of formoterol likely involves the inhibition of neutrophil activation.


Assuntos
Eosinófilos/efeitos dos fármacos , Eosinófilos/imunologia , Etanolaminas/farmacologia , Interleucina-8/farmacologia , Neutrófilos/efeitos dos fármacos , Neutrófilos/imunologia , Migração Transendotelial e Transepitelial/imunologia , Membrana Basal , Células Cultivadas , Quimiotaxia de Leucócito/efeitos dos fármacos , Fumarato de Formoterol , Humanos , Ativação de Neutrófilo/efeitos dos fármacos , Ativação de Neutrófilo/imunologia
4.
Nat Cell Biol ; 4(2): 160-4, 2002 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-11813001

RESUMO

The deposition of the abundant presynaptic brain protein alpha-synuclein as fibrillary aggregates in neurons or glial cells is a hallmark lesion in a subset of neurodegenerative disorders. These disorders include Parkinson's disease (PD), dementia with Lewy bodies (DLB) and multiple system atrophy, collectively referred to as synucleinopathies. Importantly, the identification of missense mutations in the alpha-synuclein gene in some pedigrees of familial PD has strongly implicated alpha-synuclein in the pathogenesis of PD and other synucleinopathies. However, specific post-translational modifications that underlie the aggregation of alpha-synuclein in affected brains have not, as yet, been identified. Here, we show by mass spectrometry analysis and studies with an antibody that specifically recognizes phospho-Ser 129 of alpha-synuclein, that this residue is selectively and extensively phosphorylated in synucleinopathy lesions. Furthermore, phosphorylation of alpha-synuclein at Ser 129 promoted fibril formation in vitro. These results highlight the importance of phosphorylation of filamentous proteins in the pathogenesis of neurodegenerative disorders.


Assuntos
Proteínas do Tecido Nervoso/metabolismo , Doenças Neurodegenerativas/metabolismo , Idoso , Sequência de Aminoácidos , Química Encefálica , Córtex Cerebral/citologia , Córtex Cerebral/metabolismo , Humanos , Corpos de Lewy/química , Corpos de Lewy/metabolismo , Espectrometria de Massas , Dados de Sequência Molecular , Proteínas do Tecido Nervoso/análise , Proteínas do Tecido Nervoso/química , Proteínas do Tecido Nervoso/genética , Fosfoproteínas/metabolismo , Proteínas Recombinantes/genética , Proteínas Recombinantes/metabolismo , Serina/metabolismo , Sinucleínas , alfa-Sinucleína
5.
Dig Dis Sci ; 56(4): 1065-74, 2011 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-20848203

RESUMO

BACKGROUND AND AIMS: Nonalcoholic steatohepatitis (NASH) is associated with fat accumulation in the liver, and develops to cirrhosis with the progression of hepatic fibrosis. Eicosapentaenoic acid (EPA) is used to treat hyperlipidemia, and suppresses hepatic fat accumulation. As the effect of EPA on NASH remains unclear, we assessed the therapeutic effect of EPA and its mechanisms in an animal model of NASH. METHODS: Wistar rats were fed a methionine- and choline-deficient (MCD) diet for 20 weeks, and given EPA ethyl ester (EPA-E, 1,000 mg/kg/day) or vehicle by gavage from week 12, at which hepatic fibrosis has already established. The liver was histologically analyzed for fibrosis and α-smooth muscle actin (αSMA) expression, and hepatic levels of transforming growth factor-ß1 (TGF-ß1), fibrogenic gene expression, reactive oxygen species (ROS), and triglyceride (TG) content were determined. Serum oxidative markers were also measured. RESULTS: EPA-E treatment significantly suppressed the MCD-induced increase in fibrotic area of liver sections, with repressed macronodule formation. EPA-E also suppressed increases in hepatic fibrogenic factors, αSMA expression, TGF-ß1 level, and messenger RNA (mRNA) levels of procollagens and connective tissue growth factor. EPA-E reduced MCD-induced increases in hepatic ROS level, serum oxidative markers, 8-isoprostane and ferritin, and hepatic TG content. Attenuation of hepatic fibrosis by EPA-E was significantly correlated with hepatic ROS level, but not TG content. CONCLUSIONS: EPA-E attenuates progression of hepatic fibrosis in developed steatohepatitis, and this effect is likely mediated by inhibition of ROS production. These actions may elicit the therapeutic effect of EPA-E against NASH.


Assuntos
Deficiência de Colina/metabolismo , Ácido Eicosapentaenoico/uso terapêutico , Cirrose Hepática/tratamento farmacológico , Metionina/deficiência , Espécies Reativas de Oxigênio/antagonistas & inibidores , Actinas/análise , Animais , Fator de Crescimento do Tecido Conjuntivo/análise , Progressão da Doença , Fígado Gorduroso/dietoterapia , Fígado Gorduroso/tratamento farmacológico , Fígado/química , Fígado/efeitos dos fármacos , Fígado/metabolismo , Fígado/patologia , Cirrose Hepática/dietoterapia , Cirrose Hepática/patologia , Masculino , Hepatopatia Gordurosa não Alcoólica , Pró-Colágeno/análise , Ratos , Ratos Wistar , Fator de Crescimento Transformador beta1/análise , Resultado do Tratamento , Triglicerídeos/análise
6.
Biochim Biophys Acta ; 1791(4): 281-8, 2009 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-19416647

RESUMO

The pathogenesis of non-alcoholic fatty liver disease (NAFLD) remains largely unknown. Here, we assessed the importance of hepatic fat accumulation on the progression of hepatitis. BALB/cA mice were fed with a standard diet (STD) or a high-fat and high-sucrose diet (HFHSD) for 14 days followed by intraperitoneal injection of d-galactosamine (DGalN) or vehicle. After 20-21 h, plasma and liver tissue were collected and analyzed. Alanine aminotransferase (ALT) and aspartate aminotransferase (AST) levels in plasma were increased significantly in HFHSD-fed mice treated with DGalN compared to STD-fed mice treated with DGalN. This exacerbation by the HFHSD was also observed in the plasma soluble tumor necrosis factor receptor (sTNFR) levels, and hepatic levels of reactive oxygen species (ROS) and the fibrogenic gene expression, such as tissue inhibitor of matrix metalloproteinase 1 (TIMP-1), connective tissue growth factor (CTGF) and osteopontin (OPN) in HFHSD-fed mice treated with DGalN. The triglyceride contents of the liver were significantly increased by the HFHSD. When eicosapentaenoic acid (EPA), a suppressor of sterol regulatory element binding protein 1 (SREBP-1), was administered to HFHSD-fed mice, the sensitivity of DGalN, as a result of plasma ALT and AST levels, was suppressed accompanied by reduced plasma sTNFR2 level and hepatic levels of triglyceride, ROS, and fibrogenic parameters, and by increased plasma adiponectin levels. These data suggest that the progression of steatotic liver injury closely depends on the accumulation of fat in the liver and is prevented by EPA through the suppression of the fatty liver change.


Assuntos
Gorduras na Dieta/administração & dosagem , Sacarose Alimentar/administração & dosagem , Ácido Eicosapentaenoico/farmacologia , Galactosamina/toxicidade , Hepatite/prevenção & controle , Fígado/efeitos dos fármacos , Adiponectina/sangue , Alanina Transaminase/sangue , Animais , Aspartato Aminotransferases/sangue , Fator de Crescimento do Tecido Conjuntivo/sangue , Expressão Gênica/efeitos dos fármacos , Hepatite/sangue , Hepatite/etiologia , Fígado/metabolismo , Fígado/patologia , Masculino , Camundongos , Camundongos Endogâmicos BALB C , RNA Mensageiro/genética , RNA Mensageiro/metabolismo , Espécies Reativas de Oxigênio/metabolismo , Receptores do Fator de Necrose Tumoral/sangue , Reação em Cadeia da Polimerase Via Transcriptase Reversa , Proteína de Ligação a Elemento Regulador de Esterol 1/metabolismo , Inibidor Tecidual de Metaloproteinase-1/metabolismo , Triglicerídeos/sangue
7.
Dig Dis Sci ; 55(3): 631-41, 2010 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-19856102

RESUMO

BACKGROUND AND AIMS: Pathogenesis of nonalcoholic steatohepatitis (NASH) is considered to be involved in fat accumulation, oxidative stress, inflammation, and fibrosis in liver, but no drug therapy has been established as yet. Eicosapentaenoic acid (EPA) is an agent used clinically to treat hypertriglyceridemia, and has been reported to suppress reactive oxygen species and inflammation. Here, we aimed to assess the effect of EPA on progression of hepatic fibrosis in an animal model of NASH. METHODS: Wistar rats were fed a methionine- and choline-deficient (MCD) diet and given EPA ethyl ester (EPA-E) (1,000 mg/kg/day) or vehicle by gavage for 8 or 20 weeks. RESULTS: The MCD diet caused development of hepatic fibrosis and nodule formation at 20 weeks. EPA-E treatment significantly suppressed MCD-induced increase in fibrosis and hepatic hydroxyproline, and inhibited nodule formation. EPA-E treatment also decreased hepatic transforming growth factor (TGF)-beta1, and messenger RNA (mRNA) levels of connective tissue growth factor. EPA-E suppressed MCD-induced elevation of serum levels of ferritin, 8-isoprostane, soluble tumor necrosis factor receptor 1 (sTNFR1), and sTNFR2 at 20 weeks, and hepatic triglyceride accumulation at 8 weeks. CONCLUSIONS: EPA-E prevents progression of hepatic fibrosis in an MCD-induced NASH model with reduction of oxidative stress, inflammation, and initial hepatic steatosis. Thus, EPA-E treatment may be a potential therapy to treat NASH.


Assuntos
Ácido Eicosapentaenoico/uso terapêutico , Fígado Gorduroso/prevenção & controle , Cirrose Hepática/prevenção & controle , Animais , Biomarcadores/análise , Fator de Crescimento do Tecido Conjuntivo/genética , Progressão da Doença , Fígado Gorduroso/tratamento farmacológico , Fígado Gorduroso/metabolismo , Fígado Gorduroso/patologia , Ferritinas/sangue , Isoprostanos/sangue , Fígado , Masculino , RNA Mensageiro/análise , Ratos , Ratos Wistar , Receptores do Fator de Necrose Tumoral/análise , Fator de Crescimento Transformador beta1/análise , Triglicerídeos/análise
8.
Artigo em Inglês | MEDLINE | ID: mdl-18762411

RESUMO

Epidemiological studies suggest that intake of omega-3 polyunsaturated fatty acids improves neurological disorders such as Alzheimer's disease which exhibit inflammatory pathology. We therefore investigated the anti-inflammatory effects of eicosapentaenoic acid (EPA) on interleukin (IL)-1beta-stimulated C6 glioma cells. In the present study, EPA inhibited pro-inflammatory cytokine IL-6 production, a characteristic of certain neurodegenerative disorders, in IL-1beta-stimulated C6 glioma cells in dose-dependent fashion. EPA down-regulated the expression of IL-6 at mRNA level, indicating that the effect of EPA occurs at the transcriptional level. In addition, peroxisome proliferator-activated receptor (PPAR) gamma antagonists abolished the inhibitory effect of EPA on IL-1beta-induced IL-6 production, whereas PPARalpha antagonist did not block the inhibitory effect of EPA. EPA might thus contribute to the regulation of pro-inflammatory cytokine production in astrocytes through interaction with PPARgamma. Among the PPARgamma ligands tested in this study, ciglitazone, a synthetic agonist of PPARgamma, effectively inhibited IL-6 production, but while neither rosiglitazone nor 15-deoxy-Delta(12,14)-prostaglandin J2 did. These findings indicate that the coordination of PPAR gamma ligands is important in inhibiting the production of IL-6 in C6 glioma cells.


Assuntos
Ácido Eicosapentaenoico/farmacologia , Glioma/metabolismo , Interleucina-1beta/farmacologia , Interleucina-6/antagonistas & inibidores , PPAR gama/metabolismo , Anilidas/farmacologia , Animais , Benzamidas/farmacologia , Sobrevivência Celular/efeitos dos fármacos , Relação Dose-Resposta a Droga , Ensaio de Imunoadsorção Enzimática , Ácidos Graxos Ômega-3/farmacologia , Ácidos Graxos Ômega-6/farmacologia , Ácidos Graxos Insaturados/farmacologia , Glioma/tratamento farmacológico , Indóis/farmacologia , Interleucina-1beta/antagonistas & inibidores , Interleucina-6/genética , Interleucina-6/metabolismo , Camundongos , PPAR gama/efeitos dos fármacos , PPAR gama/genética , Piridinas/farmacologia , RNA/efeitos dos fármacos , RNA/genética , RNA Mensageiro/biossíntese , RNA Mensageiro/efeitos dos fármacos , RNA Mensageiro/genética , Reação em Cadeia da Polimerase Via Transcriptase Reversa , Relação Estrutura-Atividade , Tiazolidinedionas/farmacologia , Células Tumorais Cultivadas
9.
Shinrigaku Kenkyu ; 79(4): 365-71, 2008 Oct.
Artigo em Japonês | MEDLINE | ID: mdl-19069119

RESUMO

This study used the Relationship Attribution Measure (RAM), developed by Fincham & Bradbury (1992), with Japanese middle-aged couples, investigating the factor structure of the RAM, indices of reliability and concurrent validity with marital satisfaction. The confirmative factor analyses supported the two-factor structure for the Japanese version of the RAM, with similar trends as reported in Fincham & Bradbury (1992). The hypothesis model that the feeling love toward the partner affected withdrawal coping via marital attribution was tested using structural equation modeling. The results supported both the mediational role of marital attribution and the direct effect of marital love on withdrawal.Using pair data, the results suggested that wives'feeling love toward their husbands affected the husbands via negative attribution, but the husbands'feelings directly affected the wives' feelings.Thus the mediational model was supported only for wives, but not for husbands. Further research is needed to explore the relationship attribution in Japanese couples.


Assuntos
Casamento/psicologia , Feminino , Humanos , Japão , Amor , Masculino , Pessoa de Meia-Idade
11.
J Neuropathol Exp Neurol ; 62(6): 644-54, 2003 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-12834109

RESUMO

Alpha-synuclein in Lewy bodies (LBs) is phosphorylated at Ser129. We raised monoclonal and polyclonal antibodies to this phosphorylation site (psyn) and examined 157 serial autopsy brains from a geriatric hospital. Anti-psyn immunoreactivity was observed in 40 of these cases (25.5%). Immunohistochemistry revealed 4 novel types of pathology: diffuse neuronal cytoplasmic staining (pre-LB); neuropil thread-like structures (Lewy threads); dot-like structures similar to argyrophilic grains (Lewy dots); and axons in the white matter (Lewy axons). This novel pathology was abundantly present around LBs and also involved the limbic subcortical white matter, the cerebral cortical molecular layer, and the spongiform changes of the medial temporal lobe associated with cases of dementia with LBs (DLB). The phosphorylated alpha-synuclein was limited to the temporal lobe in cases of Parkinson disease, spread from the temporal lobe to the frontal lobe in cases of DLB transitional form and further spread to the parietal and occipital lobes in DLB neocortical form. Our findings suggest that LB-related pathology initially involves the neuronal perikarya, dendrites, and axons, causes impairment of axonal transport and synaptic transmission, and later leads to the formation of LBs, a hallmark of functional disturbance long before neuronal cell death.


Assuntos
Envelhecimento/metabolismo , Encéfalo/metabolismo , Proteínas do Tecido Nervoso/metabolismo , Fosforilação , Idoso , Idoso de 80 Anos ou mais , Envelhecimento/patologia , Anticorpos Monoclonais , Axônios/metabolismo , Axônios/patologia , Western Blotting , Encéfalo/anatomia & histologia , Demência/metabolismo , Demência/patologia , Feminino , Corantes Fluorescentes/metabolismo , Humanos , Imuno-Histoquímica , Corpos de Lewy/metabolismo , Corpos de Lewy/patologia , Masculino , Proteínas Associadas aos Microtúbulos/metabolismo , Pessoa de Meia-Idade , Degeneração Neural/metabolismo , Degeneração Neural/patologia , Proteínas do Tecido Nervoso/imunologia , Proteínas de Neurofilamentos/metabolismo , Neurônios/citologia , Neurônios/metabolismo , Sinucleínas , alfa-Sinucleína
12.
Lipids ; 38(12): 1281-6, 2003 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-14870932

RESUMO

A mixture of oil/ethanol (1:3, w/w) was shaken at 30 degrees C with 4% immobilized Candida antarctica lipase by weight of the reaction mixture. The reaction regiospecifically converted FA at the 1- and 3-positions to FA ethyl esters, and the lipase acted on C14-C24 FA to a similar degree. The content of 2-MAG reached a maximum after 4 h; the content was 28-29 mol% based on the total amount of FA in the reaction mixture at 59-69% ethanolysis. Only 2-MAG were present in the reaction mixture during the first 4 h, and 1(3)-MAG were detected after 7 h. After removal of ethanol from the 4-h reaction mixture by evaporation, 2-MAG were fractionated by silica gel column chromatography. The contents of FA in the 2-MAG obtained by ethanolysis of several oils coincided well with FA compositions at the 2-position, which was analyzed by Grignard degradation. It was shown that ethanolysis of oil with C. antarctica lipase can be applied to analysis of FA composition at the 2-position in TAG.


Assuntos
Candida/enzimologia , Lipase/metabolismo , Óleos/metabolismo , Ácido Araquidônico/metabolismo , Cromatografia em Camada Fina , Proteínas Fúngicas , Sensibilidade e Especificidade
13.
PLoS One ; 9(10): e106705, 2014.
Artigo em Inglês | MEDLINE | ID: mdl-25353362

RESUMO

Infants universally elicit in adults a set of solicitous behaviors that are evolutionarily important for the survival of the species. However, exposure, experience, and prejudice appear to govern adults' social choice and ingroup attitudes towards other adults. In the current study, physiological arousal and behavioral judgments were assessed while adults processed unfamiliar infant and adult faces of ingroup vs. outgroup members in two contrasting cultures, Japan and Italy. Physiological arousal was investigated using the novel technique of infrared thermography and behavioral judgments using ratings. We uncovered a dissociation between physiological and behavioral responses. At the physiological level, both Japanese and Italian adults showed significant activation (increase of facial temperature) for both ingroup and outgroup infant faces. At the behavioral level, both Japanese and Italian adults showed significant preferences for ingroup adults. Arousal responses to infants appear to be mediated by the autonomic nervous system and are not dependent on direct caregiving exposure, but behavioral responses appear to be mediated by higher-order cognitive processing based on social acceptance and cultural exposure.


Assuntos
Nível de Alerta/fisiologia , Reconhecimento Visual de Modelos/fisiologia , Comportamento Social , Percepção Social , Adulto , Povo Asiático/etnologia , Temperatura Corporal , Expressão Facial , Humanos , Lactente , Itália , Japão , População Branca/etnologia
14.
J Nutr Biochem ; 21(4): 268-77, 2010 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-19369057

RESUMO

Placebo-controlled clinical studies suggest that intake of n-3 polyunsaturated fatty acids improves neurological disorders such as Alzheimer's disease, Huntington's disease and schizophrenia. To evaluate the impact of eicosapentaenoic acid (EPA), we orally administered highly purified ethyl EPA (EPA-E) to rats at a dose of 1.0 mg/g per day and measured long-term potentiation of the CA1 hippocampal region, a physiological correlate of synaptic plasticity that is thought to underlie learning and memory. The mean field excitatory postsynaptic potential slope of the EPA-E group was significantly greater than that of the control group in the CA1 region. Gene expression of hippocampal p85alpha, one of the regulatory subunits of phosphatidylinositol 3-kinase (PI3-kinase), was increased with EPA-E administration. Investigation of fatty acid profiles of neuronal and glia-enriched fractions demonstrated that a single administration of EPA-E significantly increased neuronal and glial EPA content and glial docosahexaenoic acid content, clearly suggesting that EPA was indeed taken up by both neurons and glial cells. In addition, we investigated the direct effects of EPA on the PI3-kinase/Akt pathway in differentiated PC12 cells. Phosphorylated-Akt expression was significantly increased in EPA-treated cells, and nerve growth factor withdrawal-induced increases in cell death and caspase-3 activity were suppressed by EPA treatment. These findings suggest that EPA protects against neurodegeneration by modulating synaptic plasticity and activating the PI3-kinase/Akt pathway, possibly by its own functional effects in neurons and glial cells and by its capacity to increase brain docosahexaenoic acid.


Assuntos
Ácido Eicosapentaenoico/administração & dosagem , Ácidos Graxos/metabolismo , Hipocampo/fisiologia , Plasticidade Neuronal , Neurônios/fisiologia , Fosfatidilinositol 3-Quinases/metabolismo , Transdução de Sinais , Animais , Encéfalo/metabolismo , Região CA1 Hipocampal/fisiologia , Morte Celular , Diferenciação Celular , Gorduras na Dieta/análise , Ácidos Graxos/sangue , Regulação Enzimológica da Expressão Gênica , Técnicas In Vitro , Potenciação de Longa Duração/efeitos dos fármacos , Masculino , Neuroglia/citologia , Neuroglia/metabolismo , Neurônios/citologia , Células PC12 , Fosfatidilinositol 3-Quinases/genética , Proteínas Proto-Oncogênicas c-akt/metabolismo , RNA Mensageiro/metabolismo , Distribuição Aleatória , Ratos , Ratos Wistar
15.
Artigo em Inglês | MEDLINE | ID: mdl-19328666

RESUMO

Eicosapentaenoic acid (EPA) is a member of the family of n-3 polyunsaturated fatty acids (PUFAs) that are clinically used to treat hypertriglyceridemia. The triglyceride (TG) lowering effect is likely due to an alteration in lipid metabolism in the liver, but details have not been fully elucidated. To assess the effects of EPA on hepatic TG metabolism, mice were fed a high-fat and high-sucrose diet (HFHSD) for 2 weeks and were given highly purified EPA ethyl ester (EPA-E) daily by gavage. The HFHSD diet increased the hepatic TG content and the composition of monounsaturated fatty acids (MUFAs). EPA significantly suppressed the hepatic TG content that was increased by the HFHSD diet. EPA also altered the composition of fatty acids by lowering the MUFAs C16:1 and C18:1 and increasing n-3 PUFAs, including EPA and docosahexaenoic acid (DHA). Linear regression analysis revealed that hepatic TG content was significantly correlated with the ratios of C16:1/C16:0, C18:1/C18:0, and MUFA/n-3 PUFA, but was not correlated with the n-6/n-3 PUFA ratio. EPA also decreased the hepatic mRNA expression and nuclear protein level of sterol regulatory element binding protein-1c (SREBP-1c). This was reflected in the levels of lipogenic genes, such as acetyl-CoA carboxylase alpha (ACCalpha), fatty acid synthase, stearoyl-CoA desaturase 1 (SCD1), and glycerol-3-phosphate acyltransferase (GPAT), which are regulated by SREBP-1c. In conclusion, oral administration of EPA-E ameliorates hepatic fat accumulation by suppressing TG synthesis enzymes regulated by SREBP-1 and decreases hepatic MUFAs accumulation by SCD1.


Assuntos
Ácido Eicosapentaenoico/análogos & derivados , Ácidos Graxos Monoinsaturados/antagonistas & inibidores , Fígado Gorduroso/tratamento farmacológico , Animais , Gorduras na Dieta/administração & dosagem , Gorduras na Dieta/efeitos adversos , Ácido Eicosapentaenoico/administração & dosagem , Ácidos Graxos Monoinsaturados/metabolismo , Fígado Gorduroso/etiologia , Fígado Gorduroso/metabolismo , Expressão Gênica/efeitos dos fármacos , Expressão Gênica/fisiologia , Masculino , Camundongos , Camundongos Endogâmicos C57BL , Estearoil-CoA Dessaturase/metabolismo , Proteína de Ligação a Elemento Regulador de Esterol 1/antagonistas & inibidores , Proteína de Ligação a Elemento Regulador de Esterol 1/metabolismo , Sacarose/administração & dosagem , Sacarose/efeitos adversos , Triglicerídeos/antagonistas & inibidores , Triglicerídeos/metabolismo
16.
J Nutr Biochem ; 20(12): 965-73, 2009 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-18993051

RESUMO

BACKGROUND: Amyloid beta (Abeta) peptide (1-40) can cause cognitive impairment. EXPERIMENTAL DESIGN: We investigated whether dietary preadministration of eicosapentaenoic acid (EPA) is conducive to cognition learning ability and whether it protects against the impairment of learning ability in rats infused with Abeta peptide (1-40) into the cerebral ventricle. RESULTS: Dietary EPA administered to rats for 12 weeks before the infusion of Abeta into the rat brain significantly decreased the number of reference memory errors (RMEs) and working memory errors (WMEs), suggesting that chronic administration of EPA improves cognition learning ability in rats. EPA preadministered to the Abeta-infused rats significantly reduced the increase in the number of RMEs and WMEs, with concurrent proportional increases in the levels of corticohippocampal EPA and docosahexaenoic acid (DHA) and in the DHA/arachidonic acid molar ratio. Decrease in oxidative stress in these tissues was evaluated by determining the reactive oxygen species and lipid peroxide levels. cDNA microarray analysis revealed that altered genes included those that control synaptic signal transduction, cell communication, membrane-related vesicular transport functions, and enzymes and several other proteins. CONCLUSION: The present study suggests that EPA, by acting as a precursor for DHA, ameliorates learning deficits associated with Alzheimer's disease and that these effects are modulated by the expression of proteins involved in neuronal plasticity.


Assuntos
Peptídeos beta-Amiloides/farmacologia , Ácido Eicosapentaenoico/uso terapêutico , Aprendizagem em Labirinto/efeitos dos fármacos , Memória/efeitos dos fármacos , Fragmentos de Peptídeos/farmacologia , Peptídeos beta-Amiloides/antagonistas & inibidores , Animais , Masculino , Fragmentos de Peptídeos/antagonistas & inibidores , Ratos , Ratos Wistar , Percepção Espacial/efeitos dos fármacos
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