Linked Life Data

15878373

Source:http://linkedlifedata.com/resource/pubmed/id/15878373

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pubmed-article:15878373pubmed:abstractTextMesenchymal stromal cells (MSCs) seem to be a good alternative to chondrocytes for cartilage regeneration. To obtain new information on the sequence of cellular and molecular events during in vitro chondrogenic differentiation we analysed MSCs on a widely used hyaluronic acid biomaterial (Hyaff-11). Cellular differentiation was induced using two different concentrations of TGFbeta1 (10 and 20 ng/ml) and the process was analysed at different time points (24 h, and 7, 14, 21 and 28 days) using techniques of light and electron microscopy, real-time PCR and immunohistochemistry. We found that without TGFbeta MSCs did not survive while in the presence of TGFbeta the cells significantly proliferated from day 7 until day 28. Light and electron microscopy showed that TGFbeta at 20 ng/ml better induced the formation of cartilage-like tissue. Real-time PCR showed an increased expression of collagen type II, IX and aggrecan associated to a down-regulation of collagen type I. Immunohistochemical analysis confirmed that collagen type I was down-modulated while collagen type II increased from day 14 to day 28. These data clearly showed that higher concentrations of TGFbeta (20 ng/ml) induce chondrogenesis of MSCs on Hyaff-11 scaffold better than 10 ng/ml of TGFbeta. This process is characterized by a sequence of cellular and molecular events that deal with the in vitro formation of a cartilage-like tissue.lld:pubmed
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pubmed-article:15878373pubmed:dateRevised2006-11-15lld:pubmed
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pubmed-article:15878373pubmed:articleTitleCellular and molecular events during chondrogenesis of human mesenchymal stromal cells grown in a three-dimensional hyaluronan based scaffold.lld:pubmed
pubmed-article:15878373pubmed:affiliationLaboratorio di Immunologia e Genetica, Istituti Ortopedici Rizzoli, Via di Barbiano 1/10, 40136 Bologna, Italy. labimge@alma.unibo.itlld:pubmed
pubmed-article:15878373pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:15878373pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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