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C20A4 Human Chondrocyte Cell Line

C20A4 Human Chondrocyte Cell Line is widely used as a model cell line for studying normal and pathological cartilage repair mechanisms related to chondrocyte biology and physiology.

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cell culture | mammalian: suitable

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cell culture | mammalian: suitable


cell culture | mammalian: suitable


cell based assay: suitable, cell culture | mammalian: suitable


cell culture | mammalian: suitable

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General description

The chondrocyte is the only specialized cell type present in articular cartilage. They produce secretions to support and repair the cartilage matrix. Human chondrocytes in mature articular cartilage are post-mitotic and terminally differentiated cells. Studies on human chondrocytes have been hampered by the difficulty in obtaining sufficient numbers of primary human chondrocytes from a single joint and by variabilities among donors due to factors such as age and medical conditions.

C-20/A4 cell line was established by transfecting primary cultures of rib chondrocytes from a 5-year-old male with vectors expressing origin-defective simian virus SV40 large T antigen.

Cell Line Description

Chondrocyte Cells


This product is intended for sale and sold solely to academic institutions for internal academic research use per the terms of the “Academic Use Agreement” as detailed in the product documentation. For information regarding any other use, please contact


• Each vial contains ≥ 1X106 viable cells.
• Cells are tested by PCR and are negative for HPV-16, HPV-18, Hepatitis A, B, C and HIV-1 & 2 viruses.
• Cells are negative for mycoplasma contamination.
• Each lot of cells are genotyped by STR analysis to verify the unique identity of the cell line.

Storage and Stability

Store in liquid nitrogen. The cells can be cultured for at least 10 passages after initial thawing without significantly affecting the cell marker expression and functionality.

Other Notes

Concentration: Please refer to lot specific datasheet.


RESEARCH USE ONLY. This product is regulated in France when intended to be used for scientific purposes, including for import and export activities (Article L 1211-1 paragraph 2 of the Public Health Code). The purchaser (i.e. enduser) is required to obtain an import authorization from the France Ministry of Research referred in the Article L1245-5-1 II. of Public Health Code. By ordering this product, you are confirming that you have obtained the proper import authorization.

Storage Class Code

10 - Combustible liquids



Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Certificates of Analysis (COA)

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Florian Finger et al.
Cells, tissues, organs, 178(2), 65-77 (2004-12-18)
DNA microarray analysis was used to investigate the molecular phenotype of one of the first human chondrocyte cell lines, C-20/A4, derived from juvenile costal chondrocytes by immortalization with origin-defective simian virus 40 large T antigen. Clontech Human Cancer Arrays 1.2
Murali K Mamidi et al.
American journal of cancer research, 11(10), 5063-5075 (2021-11-13)
Chondrosarcoma (CS) is the second most common skeletal malignancy in humans. High-grade CS is aggressive and extremely resistant to chemo- and radio-therapies. The lack of effective treatment options warrants the development of novel therapies. The evolutionarily conserved transcriptional co-factor JAB1
B A C Housmans et al.
Osteoarthritis and cartilage, 30(6), 862-874 (2022-02-18)
Alterations in the composition of synovial fluid have been associated with adverse effects on cartilage integrity and function. Here, we examined the phenotypic and proliferative behavior of human articular chondrocytes when cultured in vitro for 13 days with synovial fluid
Gongsheng Yuan et al.
Molecular therapy. Nucleic acids, 31, 197-210 (2023-01-27)
Synovial fibroblasts are the active and aggressive drivers in the progression of arthritis, but the cellular and molecular mechanisms remain unknown. Here, our results showed that regulator of G protein signaling 12 (RGS12) maintained ciliogenesis in synovial fibroblasts, which is
Mary B Goldring
Methods in molecular medicine, 100, 37-52 (2004-07-29)
Immortalization of chondrocytes increases life span and proliferative capacity but does not necessarily stabilize the differentiated phenotype. Expansion of chondrocyte cell lines in continuous monolayer culture may result in the loss of phenotype, particularly if high cell density is not

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