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Accelerated chondrogenesis in nanofiber polymeric scaffolds embedded with BMP-2 genetically engineered chondrocytes

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DOI: 10.4236/jbise.2010.39121    5,442 Downloads   9,546 Views   Citations

ABSTRACT

This study evaluated chondrogenesis within a nanofiber polymeric scaffold seeded with isolated untreated chondrocytes, isolated chondrocytes genetically engineered with adenoviral (Ad) bone morphogenetic protein (BMP)-2, or isolated chondrocytes genetically engineered with green fluorescent protein (Ad-GFP). Electrospun polycaprolactone scaffolds (150-200 m thickness, 700 m fiber diameter, 30 m pore size) were optimally seeded with 1 x 107 isolated chondrocytes by using a 20% serum gradient culture system. Chondrocyte-scaffold constructs (untreated, Ad-B- MP-2 and Ad-GFP) were generated from 5 adult horses, cultured in triplicate for 7 or 14 days, and quantitatively analyzed for cell proliferation (DNA content; Hoechst assay), viability, morphology (confocal microscopy), matrix production (proteoglycan content; DMMB assay), and mRNA expression of collagen I, collagen II, and aggrecan. Chondrocytes transduced with Ad-BMP-2 demonstrated greater cell numbers and significantly greater expression of chondrogenic markers including aggrecan, collagen II, and proteoglycan through 14 days of culture as compared to untransduced or Ad-GFP controls. This study demons- trated that chondrocytes can be driven to seed a polycaprolactone nanofiber scaffold by serum gradient and a polycaprolactone nanofiber scaffold containing Ad-BMP2 transduced chondrocytes resulted in grea- ter and accelerated chondrogenesis than controls. This cell engineered construct has potential use in one-step cartilage repair in vivo.

Conflicts of Interest

The authors declare no conflicts of interest.

Cite this paper

Gorsline, R. , Tangkawattana, P. , Lannutti, J. , Yamaguchi, M. , Kaeding, C. and Bertone, A. (2010) Accelerated chondrogenesis in nanofiber polymeric scaffolds embedded with BMP-2 genetically engineered chondrocytes. Journal of Biomedical Science and Engineering, 3, 908-916. doi: 10.4236/jbise.2010.39121.

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