ABSTRACT
Introducción: Las células madre mesenquimales (MSCs) tienen la capacidad única de autorenovación y pluripotencia con la cual apoyan en la regeneración de tejidos en or ganismos vivos. El mayor potencial terapéutico de las MSCs derivadas de la placenta (PDMSCs) humana, como fuente más joven de MSCs, estimula la búsqueda de las me jores condiciones de cultivo que preserven su capacidad de proliferar y diferenciarse. Sin embargo, estudios relacionados a la caracterización de la multipotencialidad de las PDMSCs durante periodos prolongados de cultivo, no han sido reportados en Panamá. Por lo tanto, el objetivo de este estudio fue el de implementar un proceso de aislamiento y cultivo que preserve las propiedades multipotentes en PDMSCs. Materiales y Méto dos: Placentas humanas a término completo fueron obtenidas para el aislamiento de las MSCs. Las PDMSCs fueron caracterizadas según su morfología, expresión positiva de marcadores CD90, CD73, CD105, y capacidad de proliferación y diferenciación a linajes mesodérmicos. Resultados: Se ha demostrado la obtención de poblaciones de PDMSCs con morfología fibroblástica, adherencia plástica, expresión positiva de los marcadores CD90, CD73 y CD105, y capacidad de diferenciación osteogénica, adi pogénica y condrogénica. Posterior al aislamiento y criopreservación, las PDMSCs mantuvieron una viabilidad mayor de 95%, una tasa de proliferación por más de 40 días en cultivo, y la expresión positiva de los marcadores CD90, CD73, y CD105 al pasaje 16. Conclusión: Nuestros resultados demuestran una metodología eficiente para obten ción y cultivo de PDMSCs que mantienen sus características multipotentes durante períodos prolongados de cultivo, abriendo el camino para futuras terapias celulares
ntroduction: Human mesenchymal stem cells are (MSCs) unique in their pluripotency and their ability to selfrenew in order to support tissue regeneration in living organisms. The increased therapeutic potential of PDMSCs as a pool of younger MSCs with a vast capacity for expansion, minor predisposition for tumor formation or immune reactions spurs the search for the best culture conditions to preserve their ability to differentiate and proliferate. However, studies regarding characterization of multipotent isolated PDMSCs during prolonged periods of culture has not been reported thus far in Panama. Therefore, in this study we seek to implement isolation and culture procedures that pre serve multipotent characteristics in PDMSCs. Materials and Methods: Fullterm human placentas were obtained for the isolation of MSCs. PDMSCs where characterized based on their morphology, positive expression of CD90, CD73, and CD105, and their ability to proliferate and differentiate to mesodermal lineages. Results: It was demonstrated that our isolated PDMSCs presented the MSC characteristics of fibroblastic morphology, plastic adherence, positive expression of CD90, CD73, and CD105 markers, as well as osteogenesis, adipogenesis, and osteogenic differentiation ability. When PDMSCs were cultured after isolation or cryopreservation, viability was maintained above 95%, with their proliferation rate maintained after 40 days, and positive expression of CD90, CD73, and CD105 markers kept after 16 passages. Conclusion: Taken together, our results de monstrated a methodology to obtain successful source of isolated human PDMSCs that kept their multipotent properties over time, opening the path for future cellular therapies.
Subject(s)
Humans , Female , Placenta/immunology , Regenerative Medicine , Mesenchymal Stem CellsABSTRACT
OBJECTIVE: To explore the effect of electroacupuncture (EA) serum on expression of myogenic differentiation antigen (Myod) and autophagy-related protein Beclin 1 in cultured muscle satellite cells of rats under starvation conditions. METHODS: The primary multifidus muscle satellite cells of one male SD rat were isolated and cultured to obtain the 3rd generation of cells. The EA serum was got from the rat received EA stimulation of bilateral "Weizhong" (BL40, 2 Hz/10 Hz, 1 mA, duration of 20 min, once daily for 7 days). The cell suspension (2×104/well) of the 3rd generation of cultured cells was transferred to each well of a 96-well plate in medium containing 10% fetal bovine serum (FBS). Twelve duplicate wells were set up for the blank control serum (without FBS), 10% FBS, 10% EA serum, 20% EA serum and 30% EA serum groups and incubated for 12 h and 24 h, respectively. Each well was supplemented with 10 µL CCK-8 reagent to be incubated for 1 h again for observing the state of cell proliferation. After culturing the primary muscle satellite cells in serum-free medium for 12 h, the cells were randomly divided into serum-free group, 10% fetal bovine serum group and optimal concentration electroacupuncture serum group, and serum of corresponding concentration was added respectively. The expression levels of Beclin 1 and cell-proliferation-related protein Myod were detected by Western blot. RESULTS: CCK-8 assay displayed that the proliferation levels were significantly higher at 12 h and 24 h after serum intervention in the 10% FBS, 10% EA serum, 20% EA serum and 30% EA serum groups than that in the blank control serum group (P0.05). As a result, 10% EA serum was selected as the optimal concentration for Western blot tests. No significant difference was found in the expression levels of Myod and Beclin 1 proteins among the serum-free, 10% FBS and 10% EA serum groups before intervention (P>0.05), and there was a marked up-regulation of Myod expression and an obvious down-regulation of Beclin 1 expression at 12 h in both the 10% EA serum and 10% FBS groups in comparison with their own pre-intervention (P0.05). CONCLUSION: EA serum can promote proliferation of cultured muscle satellite cells under starvation conditions, which is related to its functions in regulating expression of Beclin 1 and cell-proliferation-related protein Myod.
ABSTRACT
OBJECTIVE@#This study aims to compare the osteogenic differentiation capability of stem cells derived from human inflammatory periodontal ligament tissues (iPDLSCs) with those of stem cells derived from healthy periodontal ligament tissues (hPDLSCs). Both types of tissues were induced by stromal cell derived factor (SDF-1) in vitro.@*METHODS@#iPDLSCs and hPDLSCs were primarily cultured by tissue digestion method and purified by limited dilution cloning. The cells were passaged and identified by stem cell surface marker expression through flow cytometry. Then, we used thiazolyl blue tetrazolium bromide to detect and compare the proliferation capabilities of the iPDLSCs and hPDLSCs. Express of bone volumes were detected by alizarin red staining after SDF-1 was added to the cells. Using alkaline phosphatase, we evaluated the osteogenic differentiation capability of the cells induced by SDF-1. The expression levels of the osteogenesis-related genes of the cells induced by SDF-1 were determined by reverse transcription-polymerase chain reaction.@*RESULTS@#After purification, both iPDLSCs and hPDLSCs expressed stem cell markers. hPDLCSs had a higher proliferation capability than iPDLSCs. Osteogenesis-related genes had higher expression levels in the cells induced by SDF-1 than in those without induction (P<0.05). SDF-1 at 50 and 200 ng·mL⁻¹ concentration greatly affected the differen-tiation capabilities of iPDLSCs and hPDLSCs respectively.@*CONCLUSIONS@#iPDLSCs and hPDLSCs had osteogenic differentia-tion capability. The level of osteogenic differentiation in normal and inflamed periodontal ligament stem cells increases after SDF-1 induction.
Subject(s)
Humans , Cell Differentiation , Cell Proliferation , Cells, Cultured , Osteogenesis , Periodontal Ligament , Stem Cells , Stromal CellsABSTRACT
Objective To study the effects of glycosaminoglycan extracted from Pinctada martensii on the proliferation, differentiation and mineralization of newborn rat calvarium osteoblast in vitro. Methods MTT, PNPP and ARS methods were used to measure the cell proliferation, activity of ALP and the function of mineral nodes formation of osteoblasts cultured in vitro. Results Glycosaminoglycan at concentration of 0.008～0.5g?L -1 inhibited mildly the proliferation of osteoblast cells, however, this range of concentrations of glycosaminoglycan markedly increased the ALP activity and stimulated mineral node bone formation in osteoblast. Conclusion Glycosaminoglycan extracted from the Pinctada martensii showed stimulating effects on the differentiation and mineralization of newborn rat calvarium osteoblast in vitro, but the stimulating effect on cells proliferation was not observed.