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1.
Braz. j. med. biol. res ; 47(8): 637-645, 08/2014. tab, graf
Artigo em Inglês | LILACS | ID: lil-716279

RESUMO

Tissue engineering encapsulated cells such as chondrocytes in the carrier matrix have been widely used to repair cartilage defects. However, chondrocyte phenotype is easily lost when chondrocytes are expanded in vitro by a process defined as “dedifferentiation”. To ensure successful therapy, an effective pro-chondrogenic agent is necessary to overcome the obstacle of limited cell numbers in the restoration process, and dedifferentiation is a prerequisite. Gallic acid (GA) has been used in the treatment of arthritis, but its biocompatibility is inferior to that of other compounds. In this study, we modified GA by incorporating sulfamonomethoxine sodium and synthesized a sulfonamido-based gallate, JJYMD-C, and evaluated its effect on chondrocyte metabolism. Our results showed that JJYMD-C could effectively increase the levels of the collagen II, Sox9, and aggrecan genes, promote chondrocyte growth, and enhance secretion and synthesis of cartilage extracellular matrix. On the other hand, expression of the collagen I gene was effectively down-regulated, demonstrating inhibition of chondrocyte dedifferentiation by JJYMD-C. Hypertrophy, as a characteristic of chondrocyte ossification, was undetectable in the JJYMD-C groups. We used JJYMD-C at doses of 0.125, 0.25, and 0.5 µg/mL, and the strongest response was observed with 0.25 µg/mL. This study provides a basis for further studies on a novel agent in the treatment of articular cartilage defects.


Assuntos
Animais , Coelhos , Benzamidas/síntese química , Desdiferenciação Celular/efeitos dos fármacos , Proliferação de Células/efeitos dos fármacos , Condrócitos/efeitos dos fármacos , Fenótipo , Pirimidinas/síntese química , Agrecanas/genética , Agrecanas/metabolismo , Anti-Infecciosos/química , Anti-Infecciosos/farmacologia , Benzamidas/farmacologia , Sobrevivência Celular , Desdiferenciação Celular/imunologia , Condrócitos/citologia , Condrócitos/metabolismo , Condrogênese/efeitos dos fármacos , Colágeno Tipo I/genética , Colágeno Tipo I/metabolismo , Colágeno Tipo II/genética , Colágeno Tipo II/metabolismo , Glicosaminoglicanos/análise , Imuno-Histoquímica , Citometria de Varredura a Laser , Cultura Primária de Células , Pirimidinas/farmacologia , Reação em Cadeia da Polimerase em Tempo Real , Fatores de Transcrição SOX9/genética , Fatores de Transcrição SOX9/metabolismo , Engenharia Tecidual
2.
Biol. Res ; 41(2): 205-215, 2008. ilus, graf
Artigo em Inglês | LILACS | ID: lil-495755

RESUMO

Although several linker histone variants have been studied in both animal and plant organisms, little is known about their distribution during processes that involve alterations in chromatin function, such as differentiation, dedifferentiation and hormone treatment. In this study, we identified linker histone variants by using specific anti-histone Hl antibodies. Each variant's ratio to total Hl in the three developmental zones of maize (Zea mays L.) root and in callus cultures derived from them was estimated in order to define possible alterations either during plant cell differentiation or during their dedifferentiation. We also evaluated linker histone variants' ratios in the developmental zones of maize roots treated with auxin in order to examine the effects of exogenous applied auxin to linker histone variant distribution. Finally, immunohistochemical detection was used to identify the root tissues containing each variant and correlate them with the physiological status of the plant cells. According to the results presented in this study, linker histone variants' ratios are altered in the developmental zones of maize root, while they are similar to the meristematic zone in samples from callus cultures and to the differentiation zone in samples from roots treated with auxin. We propose that the alterations in linker histone variants' ratios are correlated with plant cell differentiation and dedifferentiation.


Assuntos
Histonas/análise , Ácidos Indolacéticos/farmacologia , Reguladores de Crescimento de Planta/farmacologia , Raízes de Plantas/química , Zea mays/química , Desdiferenciação Celular/efeitos dos fármacos , Diferenciação Celular/efeitos dos fármacos , Histonas/classificação , Imuno-Histoquímica , Raízes de Plantas/citologia , Raízes de Plantas/efeitos dos fármacos , Técnicas de Cultura de Tecidos , Zea mays/citologia , Zea mays/efeitos dos fármacos
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