Ligament-derived matrix stimulates a ligamentous phenotype in human adipose-derived stem cells.
Human adipose stem cells (hASCs) can differentiate into a variety of phenotypes. Native extracellular matrix (e.g., demineralized bone matrix or small intestinal submucosa) can influence the growth and differentiation of stem cells. The hypothesis of this study was that a novel ligament-derived matrix (LDM) would enhance expression of a ligamentous phenotype in hASCs compared to collagen gel alone. LDM prepared using phosphate-buffered saline or 0.1% peracetic acid was mixed with collagen gel (COL) and was evaluated for its ability to induce proliferation, differentiation, and extracellular matrix synthesis in hASCs over 28 days in culture at different seeding densities (0, 0.25 x 10(6), 1 x 10(6), or 2 x 10(6) hASC/mL). Biochemical and gene expression data were analyzed using analysis of variance. Fisher's least significant difference test was used to determine differences between treatments following analysis of variance. hASCs in either LDM or COL demonstrated changes in gene expression consistent with ligament development. hASCs cultured with LDM demonstrated more dsDNA content, sulfated-glycosaminoglycan accumulation, and type I and III collagen synthesis, and released more sulfated-glycosaminoglycan and collagen into the medium compared to hASCs in COL (p <or= 0.05). Increased seeding density increased DNA content incrementally over 28 days in culture for LDM but not COL constructs (p <or= 0.05). These findings suggest that LDM can stimulate a ligament phenotype by hASCs, and may provide a novel scaffold material for ligament engineering applications.
Little
Dianne
D
Division of Orthopaedic Surgery, Department of Surgery, Duke University Medical Center, Durham, North Carolina 27710, USA.
Guilak
Farshid
F
Ruch
David S
DS
D000273:Adipose Tissue / Q000166:cytology*; D000328:Adult; D000818:Animals; D003094:Collagen / Q000378:metabolism; D004247:DNA / Q000378:metabolism; D005109:Extracellular Matrix / Q000378:metabolism*; D005260:Female; D005786:Gene Expression Regulation; D006025:Glycosaminoglycans / Q000378:metabolism; D006801:Humans; D008022:Ligaments / Q000378:metabolism*; D008875:Middle Aged; D010641:Phenotype; D013234:Stem Cells / Q000166:cytology* / Q000378:metabolism; D034421:Sus scrofa; D013710:Tendons / Q000166:cytology / Q000378:metabolism; D054457:Tissue Scaffolds
D006025:Glycosaminoglycans; C013786:A73025; D003094:Collagen; D004247:DNA
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