Unlike braided fabrics, knitted scaffolds have been proven to favor deposition of collagenous connective
tissue matrix, which is crucial for tendon/ligament reconstruction. But cell seeding of such
scaffolds often requires a gel system, which is unstable in a dynamic situation, especially in the knee
joint. This study developed a novel, biodegradable nano-microfibrous polymer scaffold by electrospinning
PLGA nanofibers onto a knitted PLGA scaffold in order to provide a large biomimetic
surface for cell attachment. Porcine bone marrow stromal cells were seeded onto either the novel
scaffolds by pipetting a cell suspension (Group I) or the knitted PLGA scaffolds by immobilizing in
fibrin gel (Group II). Cell attachment at 36 hours, cell proliferation and extracellular matrix synthesis
at 1 week, and mechanical properties over 2 weeks were investigated. Cell attachment was
comparable and cell proliferation was faster in Group I. Moreover, cellular function was more actively
exhibited in Group I, as evident by the higher expression of collagen I, decorin, and biglycan
genes. Thus, this novel scaffold, facilitating cell seeding and promoting cell proliferation, function,
and differentiation, could be applied with promise in tissue engineering of tendon/ligament.
Unlike braided fabrics, knitted scaffolds have been proven to favor deposition of collagenous connective
tissue matrix, which is crucial for tendon/ligament reconstruction. But cell seeding of such
scaffolds often requires a gel system, which is unstable in a dynamic situation, especially in the knee
joint. This study developed a novel, biodegradable nano-microfibrous polymer scaffold by electrospinning
PLGA nanofibers onto a knitted PLGA scaffold in order to provide a large biomimetic
surface for cell attachment. Porcine bone marrow stromal cells were seeded onto either the novel
scaffolds by pipetting a cell suspension (Group I) or the knitted PLGA scaffolds by immobilizing in
fibrin gel (Group II). Cell attachment at 36 hours, cell proliferation and extracellular matrix synthesis
at 1 week, and mechanical properties over 2 weeks were investigated. Cell attachment was
comparable and cell proliferation was faster in Group I. Moreover, cellular function was more actively
exhibited in Group I, as evident by the higher expression of collagen I, decorin, and biglycan
genes. Thus, this novel scaffold, facilitating cell seeding and promoting cell proliferation, function,
and differentiation, could be applied with promise in tissue engineering of tendon/ligament.
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