Co-culture of chondrons and mesenchymal stromal cells reduces the loss of collagen VI and improves extracellular matrix production

Adult articular chondrocytes are surrounded by a pericellular matrix (PCM) to form a chondron. The PCM is rich in hyaluronan, proteoglycans, and collagen II, and it is the exclusive location of collagen VI in articular cartilage. Collagen VI anchors the chondrocyte to the PCM. It has been suggested...

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Bibliographic Details
Published in:Histochemistry and cell biology 2017-12, Vol.148 (6), p.625-638
Main Authors: Owida, H. A., De Las Heras Ruiz, T., Dhillon, A., Yang, Y., Kuiper, N. J.
Format: Article
Language:English
Subjects:
Animals
Biochemistry
Biomedical and Life Sciences
Biomedicine
Cartilage (articular)
Cattle
Cell Biology
Cell culture
Chondrocytes
Chondrocytes - cytology
Chondrocytes - metabolism
Coculture Techniques
Collagen
Collagen (type II)
Collagen Type VI - metabolism
Developmental Biology
Extracellular matrix
Extracellular Matrix - metabolism
Hyaluronic acid
Immunofluorescence
Mesenchymal stem cells
Mesenchymal Stem Cells - cytology
Mesenchymal Stem Cells - metabolism
Mesenchyme
Original Paper
Preservation
Proteoglycans
Rats
Rats, Sprague-Dawley
Serine
Serine proteinase
Stromal cells
Temperature requirements
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Summary:Adult articular chondrocytes are surrounded by a pericellular matrix (PCM) to form a chondron. The PCM is rich in hyaluronan, proteoglycans, and collagen II, and it is the exclusive location of collagen VI in articular cartilage. Collagen VI anchors the chondrocyte to the PCM. It has been suggested that co-culture of chondrons with mesenchymal stromal cells (MSCs) might enhance extracellular matrix (ECM) production. This co-culture study investigates whether MSCs help to preserve the PCM and increase ECM production. Primary bovine chondrons or chondrocytes or rat MSCs were cultured alone to establish a baseline level for ECM production. A xenogeneic co-culture monolayer model using rat MSCs (20, 50, and 80%) was established. PCM maintenance and ECM production were assessed by biochemical assays, immunofluorescence, and histological staining. Co-culture of MSCs with chondrons enhanced ECM matrix production, as compared to chondrocyte or chondron only cultures. The ratio 50:50 co-culture of MSCs and chondrons resulted in the highest increase in GAG production (18.5 ± 0.54 pg/cell at day 1 and 11 ± 0.38 pg/cell at day 7 in 50:50 co-culture versus 16.8 ± 0.61 pg/cell at day 1 and 10 ± 0.45 pg/cell at day 7 in chondron monoculture). The co-culture of MSCs with chondrons appeared to decelerate the loss of the PCM as determined by collagen VI expression, whilst the expression of high-temperature requirement serine protease A1 (HtrA1) demonstrated an inverse relationship to that of the collagen VI. Together, this implies that MSCs directly or indirectly inhibited HtrA1 activity and the co-culture of MSCs with chondrons enhanced ECM synthesis and the preservation of the PCM.
ISSN:0948-6143
1432-119X
DOI:10.1007/s00418-017-1602-4