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Gene expression of single articular chondrocytes

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Abstract

Although previous studies in the field of tissue engineering have provided important information about articular cartilage, their conclusions are based on population averages and do not account for variations in cell subpopulations. To obtain a precise understanding of chondrocytes, we investigated the effects of cartilage zone and seeding duration on single chondrocyte gene expression to select an optimal zone for tissue engineering (Phase I), followed by an evaluation of growth factor exposure on the zone selected in Phase I (Phase II). In Phase I, superficial and middle/deep bovine articular chondrocytes were seeded in monolayers for 3 or 18 h. In Phase II, middle/deep chondrocytes (selected in Phase I) received 100 ng/ml insulin-like growth factor-I (IGF-I) for 3 h. Real-time reverse transcription/polymerase chain reaction was used to quantify the abundance of D-glyceraldehyde-3-phosphate dehydrogenase (GAPDH) and the relative abundances of aggrecan, collagens I and II, cartilage oligomeric matrix protein (COMP), matrix metalloproteinase-1 (MMP-1), and tissue inhibitor of metalloproteinase-1 (TIMP-1). GAPDH varied zonally, but neither time nor IGF-I had an effect on it, suggesting that GAPDH is a suitable housekeeping gene for comparisons within each zone, but not across zones. IGF-I increased the expression of aggrecan and collagen II in middle/deep chondrocytes seeded for 18 h. TIMP-1 expression increased with time in control cells, suggesting that chondrocytes enter a matrix protective state after seeding. IGF-I diminished this effect, suggesting that treatment with IGF-I refocuses chondrocytes on matrix production rather than on protection from metalloproteinases. Concomitant to increasing TIMP-1, MMP-1 was detectable by 18 h in superficial cells, providing further evidence of a trend toward matrix degradation with time. Collagen I was undetected in all cells, and no differences were observed for COMP, confirming that no dedifferentiation or osteoarthritic changes occurred. Taken together, these results establish a unique understanding of individual chondrocyte behavior.

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Acknowledgement

We thank Adrian Shieh for his assistance and feedback during this study.

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Authors and Affiliations

  1. Department of Bioengineering, MS-142, Rice University, P.O. Box 1892, Houston, TX 77251, USA

    Sriram V. Eleswarapu, Nic D. Leipzig & Kyriacos A. Athanasiou

  2. Medical Scientist Training Program, Baylor College of Medicine, Houston, TX, USA

    Sriram V. Eleswarapu

Authors
  1. Sriram V. Eleswarapu
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  2. Nic D. Leipzig
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  3. Kyriacos A. Athanasiou
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Corresponding author

Correspondence to Kyriacos A. Athanasiou.

Additional information

This research was supported by an Osteoarthritis Biomarkers Biomedical Science Grant from the Arthritis Foundation, National Institutes of Health Grant 5T32-GM008362 and by the Rice Undergraduate Scholars Program.

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Eleswarapu, S.V., Leipzig, N.D. & Athanasiou, K.A. Gene expression of single articular chondrocytes. Cell Tissue Res 327, 43–54 (2007). https://doi.org/10.1007/s00441-006-0258-5

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