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Creating a spectrum of fibrocartilages through different cell sources and biochemical stimuli. Biotechnol Bioeng 2008 Jun 15;100(3):587-98

Date

12/15/2007

Pubmed ID

18078296

DOI

10.1002/bit.21768

Scopus ID

2-s2.0-44049107265   21 Citations

Abstract

In this study a scaffoldless approach was employed with two different cell sources and biochemical stimuli to engineer a spectrum of fibrocartilages representative of the different regions of the knee meniscus. Constructs composed of 100% fibrochondrocytes (FC) or a 50:50 co-culture of fibrochondrocytes and chondrocytes (CC) were cultured in 10% fetal bovine serum medium or serum-free "chondrogenic" medium, each +/-10 ng/mL TGF-beta1 (+T). Constructs from these two cell groups and four culture conditions were cultured for 6 weeks. By varying the cell type and presence of the growth factor, GAG per dry weight of the constructs spanned that of native tissue, ranging 16-45% and 1-7% in the CC and FC groups, respectively. Collagen density was most dependent on cell type and was significantly lower than tissue values. The collagen I/II ratio could be manipulated by cell type and serum presence to span the native range, from 3.5 in the serum-free CC group to over 1,000 in the FC groups treated with serum-containing medium. Using the CC cell group in the presence of serum-free medium dramatically increased the compressive stiffness to 128 +/- 34 kPa, similar to native tissue. Similarly, serum-free medium or TGF-beta1 treatment enhanced the tensile modulus by an order of magnitude, up to 3,000 kPa. Using two cell sources and manipulating biochemical stimuli, a range of fibrocartilaginous neotissues was engineered. Fibrocartilages such as the knee meniscus are characterized by heterogeneity in matrix and functional properties, and this work demonstrates a strategy for recreating these heterogeneous tissues.

Author List

Hoben GM, Athanasiou KA

Author

Gwendolyn M B Hoben MD Assistant Professor in the Plastic Surgery department at Medical College of Wisconsin




MESH terms used to index this publication - Major topics in bold

Animals
Cattle
Cell Culture Techniques
Chondrocytes
Coculture Techniques
Collagen
Culture Media
Fibrocartilage
Tensile Strength
Tissue Engineering
Transforming Growth Factor beta1
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