TY - JOUR
T1 - Transforming growth factor-β1 stimulates chondrogenic differentiation of posterofrontal suture-derived mesenchymal cells in vitro
AU - Xu, Yue
AU - James, Aaron W.
AU - Longaker, Michael T.
N1 - Copyright:
Copyright 2012 Elsevier B.V., All rights reserved.
PY - 2008/12
Y1 - 2008/12
N2 - BACKGROUND: Evidence from animal studies has associated transforming growth factor (TGF)-β signaling with both normal and premature cranial suture fusion. However, the mechanisms whereby this pleiotropic cytokine mediates suture fusion remain uncertain. The authors established cultures of suture-derived mesenchymal cells from normally fusing (posterofrontal) and patent (sagittal) sutures and examined the in vitro effects of TGF-β1 on these distinct cell populations. METHODS: Skulls were harvested from 80 5-day-old mice. Posterofrontal and sagittal sutures were dissected, and cultures of suture-derived mesenchymal cells were established. The mitogenic, osteogenic, and chondrogenic effects of recombinant TGF-β1 were then assessed on posterofrontal and sagittal suture-derived mesenchymal cells (1 to 10 ng/ml). Quantitative real-time polymerase chain reaction was used to examine the effects of TGF-β1 on gene expression. RESULTS: TGF-β1 significantly decreased proliferation of both posterofrontal and sagittal suture-derived mesenchymal cells, by bromodeoxyuridine incorporation assays (n = 6). TGF-β1 also inhibited osteogenesis in both suture-derived mesenchymal cells determined by alkaline phosphatase activity and mineralization (n = 3 for all assays). During chondrogenic differentiation, TGF-β1 markedly increased expression of chondrocyte-specific gene markers in posterofrontal suture-derived mesenchymal cells (Sox9, Col II, Aggrecan, and Col X) (p ≤ 0.05). In contrast, TGF-β1 did not increase chondrocyte-specific gene expression in sagittal suture-derived mesenchymal cells (n = 3). CONCLUSIONS: Posterofrontal suture-derived mesenchymal cells retain significant capability for both osteogenic and chondrogenic differentiation in vitro. TGF-β1 induces in vitro chondrogenesis in posterofrontal but not sagittal suture-derived mesenchymal cells. Future studies will focus on elucidating the mechanisms whereby TGF-β signaling mediates chondrogenesis in posterofrontal suture-derived mesenchymal cells.
AB - BACKGROUND: Evidence from animal studies has associated transforming growth factor (TGF)-β signaling with both normal and premature cranial suture fusion. However, the mechanisms whereby this pleiotropic cytokine mediates suture fusion remain uncertain. The authors established cultures of suture-derived mesenchymal cells from normally fusing (posterofrontal) and patent (sagittal) sutures and examined the in vitro effects of TGF-β1 on these distinct cell populations. METHODS: Skulls were harvested from 80 5-day-old mice. Posterofrontal and sagittal sutures were dissected, and cultures of suture-derived mesenchymal cells were established. The mitogenic, osteogenic, and chondrogenic effects of recombinant TGF-β1 were then assessed on posterofrontal and sagittal suture-derived mesenchymal cells (1 to 10 ng/ml). Quantitative real-time polymerase chain reaction was used to examine the effects of TGF-β1 on gene expression. RESULTS: TGF-β1 significantly decreased proliferation of both posterofrontal and sagittal suture-derived mesenchymal cells, by bromodeoxyuridine incorporation assays (n = 6). TGF-β1 also inhibited osteogenesis in both suture-derived mesenchymal cells determined by alkaline phosphatase activity and mineralization (n = 3 for all assays). During chondrogenic differentiation, TGF-β1 markedly increased expression of chondrocyte-specific gene markers in posterofrontal suture-derived mesenchymal cells (Sox9, Col II, Aggrecan, and Col X) (p ≤ 0.05). In contrast, TGF-β1 did not increase chondrocyte-specific gene expression in sagittal suture-derived mesenchymal cells (n = 3). CONCLUSIONS: Posterofrontal suture-derived mesenchymal cells retain significant capability for both osteogenic and chondrogenic differentiation in vitro. TGF-β1 induces in vitro chondrogenesis in posterofrontal but not sagittal suture-derived mesenchymal cells. Future studies will focus on elucidating the mechanisms whereby TGF-β signaling mediates chondrogenesis in posterofrontal suture-derived mesenchymal cells.
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U2 - 10.1097/PRS.0b013e31818cbf44
DO - 10.1097/PRS.0b013e31818cbf44
M3 - Article
C2 - 19050517
AN - SCOPUS:58149393749
SN - 0032-1052
VL - 122
SP - 1649
EP - 1659
JO - Plastic and reconstructive surgery
JF - Plastic and reconstructive surgery
IS - 6
ER -