RESUMO
Isolation of induced pluripotent stem cells (iPSCs) from fully differentiated somatic cells has revolutionized existing concepts of cell differentiation and stem cells. Importantly, iPSCs generated from somatic cells of patients can be used to model different types of human diseases. They may also serve as autologous cell sources that can be used in transplantation therapy. In this study, we investigated the neuronal properties of an iPSC line that is derived from human neonatal foreskin fibroblasts (FS-1). We initially examined the morphology and marker expression of FS-1 cells at undifferentiated stage. We then spontaneously differentiated FS-1 cells in suspension culture and examined the expression of markers representing three germ layers. We finally differentiated FS-1 cells into neuronal lineages by co-culturing them with PA6 stromal cells, and found that, under the conditions we used, they have a tendency to differentiate into more forebrain-type neurons, suggesting that FS-1 iPSC-derived neural cells will be useful to be used in cell therapy of stroke or Huntington's disease, among others. Taken together, FS-1 cells derived from human neonatal fibroblasts exhibit very similar properties with human ES cells, and can provide useful sources for cell therapy and various other applications.
Assuntos
Humanos , Recém-Nascido , Diferenciação Celular , Fibroblastos , Prepúcio do Pênis , Camadas Germinativas , Doença de Huntington , Células-Tronco Pluripotentes Induzidas , Neurônios , Células-Tronco Pluripotentes , Células-Tronco , Acidente Vascular Cerebral , Células Estromais , Terapia Baseada em Transplante de Células e Tecidos , TransplantesRESUMO
OBJECTIVES: The purpose of this study was to evaluate the dental erosion inhibitory effect of hangover beverage containing calcium and fluoride. METHODS: Risk factors of dental erosion in the varying concentrations of fluoride, Ca, P, pH, and the buffer capacity were measured in six groups of mixture: distilled water, Morning care, Morning care adding 3% calcium, Morning care adding 5% calcium, Morning care adding 4 ppm F, Morning care adding 3% calcium and 4 ppm F. Seventy two specimens were prepared for the microhardness tests and divided randomly into 6 groups (n=12). Each group was exposed to the six groups of the mixture for 1, 3, 5, 10, 15, 30 min. Surface microhardness was measured before and after the treatment, and the surface was observed by SEM after the treatment only. RESULTS: After 30 minutes of treatment, the surface microhardness changes were significantly different among the six groups: Distilled water (0.11+/-1.98 DeltaVHN), Morning care (100.49+/-9.66 DeltaVHN), Morning care+3% calcium (17.07+/-8.45 DeltaVHN), Morning care+5% calcium (10.35+/-7.61 DeltaVHN), Morning care+4 ppm F (93.96+/-15.13 DeltaVHN), Morning care+3% calcium+4 ppm F (14.21+/-7.97 DeltaVHN) (P0.05) when compared with the distilled water group. CONCLUSIONS: It is suggested that modification of the Morning care with 3% calcium could be useful for a significant protective potential with respect to dental erosion.
Assuntos
Bebidas , Cálcio , Esmalte Dentário , Fluoretos , Concentração de Íons de Hidrogênio , Fatores de Risco , ÁguaRESUMO
OBJECTIVES: The purpose of this investigation was to evaluate the remineralization effect of CPP-ACP, NaF, bamboo salt and NaF+bamboo salt solutions on bovine incipient artificial enamel caries by microcomputed tomography (micro CT). METHODS: Specimens were prepared from extracted bovine teeth and immersed in a demineralizing solution for 72 h. Specimens were divided into five groups of five specimens each by randomized blocks according to surface microhardness (VHN) and mineral density. The specimens were each treated by one of the following agents for 24 h: distilled water, 2% sodium fluoride solution (2% NaF group), 3% bamboo salt solution (3% BS group), and a solution of 2% sodium fluoride solution and 3% bamboo salt solution mixed together (2% NaF+3% BS group) and 1% CPP-ACP solution. After this, the specimens were immersed in artificial saliva for 15 and 30 days. After 15 days and 30 days treatment, VHN and mineral density values (g/cm3) were measured and analysed. Mineral density values were obtained using micro CT. RESULTS: Mineral density and VHN of the five groups according to the immersion period in artificial saliva showed statistically significant differences (P<0.05). In mineral density and VHN, the values of the 2% NaF+3% BS group were significantly higher than those of the other groups, and there were no significant differences among the 2% NaF, 3% BS, CPP-ACP groups after 30 days. CONCLUSIONS: Bamboo salt showed a similar remineralization pattern to CPP-ACP on an incipient artificial enamel caries lesion. Thus, bamboo salt (like CPP-ACP) can act as a remineralization agent for subsurface lesions of incipient enamel caries.