Serum-free, chemically defined medium with TGF-beta(3) enhances functional properties of nucleus pulposus cell-laden carboxymethylcellulose hydrogel constructs.


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    Views: ()   Date: (2009-9-25)   Pages: ()
  • Author:  Steven B Nicoll  

  • Abstract:  Degeneration of the nucleus pulposus (NP) has been implicated as a major cause of low back pain. Tissue engineering strategies may provide a viable NP replacement therapy; however, culture conditions must be optimized to promote functional tissue development. In this study, a standard serum-containing medium formulation was compared to a chemically defined, serum-free medium to determine the effect on matrix elaboration and functional properties of NP cell-laden carboxymethylcellulo se (CMC) hydrogels. Additionally, both media were further supplemented with transforming growth factor-beta 3 (TGF-beta(3)). Glycosaminoglycan (GAG) content increased in both TGF-beta(3)-treated groups and was highest for treated, serum-free constructs (9.46 +/- 1.51 microg GAG/mg wet weight), while there were no quantifiable GAGs in untreated serum-containing samples. Histology revealed uniform, interterritorial staining for chondroitin sulfate proteoglycan throughout the treated, serum-free constructs. Type II collagen content was greater in both serum-free groups and highest in treated, serum-free constructs. The equilibrium Young's modulus was highest in serum-free samples supplemented with TGF-beta(3) (18.54 +/- 1.92 kPa), and the equilibrium weight swelling ratio of these constructs approached that of the native NP tissue (22.19 +/- 0.46 vs. 19.94 +/- 3.09, respectively). Taken together, these results demonstrate enhanced functional matrix development by NP cells when cultured in CMC hydrogels maintained in serum-free, TGF-beta(3) supplemented medium, indicating the importance of medium formulation in NP construct development.

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