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An established rat cell line expressing chondrocyte properties
W E Horton1, J Cleveland, U Rapp
1Connective Tissue and Monoclonal Antibody Research Department, Lilly Research Laboratories, Lilly Corporate Center, Indianapolis, Indiana 46285.
Experimental Cell Research
|October 1, 1988
Summary
Researchers developed an immortalized rat chondrocyte cell line (IRC) for studying cell differentiation. This stable cell line maintains many differentiated characteristics and responds to modulators like retinoic acid.
Area of Science:
- Cell Biology
- Molecular Biology
- Biotechnology
Background:
- Primary rat chondrocytes are crucial for studying cell differentiation and gene expression.
- Primary chondrocytes exhibit limited stability in culture, hindering extensive research.
- Established rat chondrocyte genes, like collagen II, necessitate a stable cell line for further characterization.
Purpose of the Study:
- To develop a stable, immortalized rat chondrocyte cell line for research applications.
- To characterize the phenotype and responsiveness of the immortalized chondrocyte line.
- To explore the potential of immortalized chondrocytes in disease modeling and human cartilage studies.
Main Methods:
- Infection of primary fetal rat costal chondrocytes with a recombinant retrovirus (NIH/J-2) carrying myc and raf oncogenes.
- Isolation and characterization of a rapidly proliferating clonal cell line (IRC) through 45 passages.
- Analysis of cellular morphology, matrix production (alcian blue staining), and expression of specific proteins (proteoglycan core protein, link protein, collagen II, v-myc).
- Assessment of IRC cell response to retinoic acid treatment.
Main Results:
- An immortalized chondrocyte cell line (IRC) was successfully established, maintaining stability for over 1.5 years.
- IRC cells exhibited characteristics of differentiated chondrocytes, including matrix production, but with reduced collagen II expression.
- IRC cells expressed virally derived myc but not v-raf, and responded to retinoic acid by down-regulating chondrocyte markers and up-regulating v-myc.
- The immortalized cells maintained responsiveness to phenotypic modulators.
Conclusions:
- The immortalized rat chondrocyte cell line (IRC) supports rapid cell division while preserving key differentiated chondrocyte phenotypes.
- IRC cells remain responsive to external modulators like retinoic acid, offering a valuable tool for studying chondrocyte regulation.
- This cell line holds potential for developing cell lines from diseased or human cartilage for future research.