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Modulation of chondrocyte migration and aggregation by insulin-like growth factor-1 in cultured cartilage

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The effect of insulin-like growth factor-1 (IGF-1) on the behavior of rabbit chondrocytes in cultured collagen (CL) gels initially seeded with 2 × 105 cells/ml was examined. On day 5, the frequency of migrating cells cultured in presence of 100 ng IGF-1/ml was 0.04, which was 54 % of the frequency in IGF-1-free culture. The presence of IGF-1 caused an increase in the frequency of dividing cells from 0.09 to 0.13. These results suggest that IGF-1 suppressed the migration of chondrocytes in the CL gels while stimulating cell division in the initial culture phase. The proteolytic migration of cells was thought to be suppressed by the down-regulation of membrane type 1 matrix metalloproteinase by IGF-1. This contributed to the formation of aggregates with spherical-shaped cells that produced collagen type II.

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Correspondence to Masahito Taya.

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Nadzir, M.M., Kino-oka, M., Sugawara, K. et al. Modulation of chondrocyte migration and aggregation by insulin-like growth factor-1 in cultured cartilage. Biotechnol Lett 35, 295–300 (2013).

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