Abstract
Clonal proliferation of freshly isolated human fetal chondrocytes and adult chondrocytes in response to human insulinlike growth factors I and II (IGF I, IGF II), human biosynthetic insulin, and human growth hormone (GH) was assessed. IGF I (25 ng/ml) stimulated clonal growth of fetal chondrocytes (54 +/- 12 colonies/1,000 inserted cells, mean +/- 1 SD), but IGF II (25 ng/ml) was significantly more effective (106 +/- 12 colonies/1,000 inserted cells, P less than 0.05, unstimulated control: 14 +/- 4 colonies/1,000 inserted cells). In contrast, IGF I (25 ng/ml) was more effective in adult chondrocytes (42 +/- 6 colonies/1,000 inserted cells) than IGF II (25 ng/ml) (21 +/- 6 colonies/1,000 inserted cells; P less than 0.05, unstimulated control: 6 +/- 3 colonies/1,000 inserted cells). GH and human biosynthetic insulin did not affect clonal growth of fetal or adult chondrocytes. The clonal growth pattern of IGF-stimulated fetal and adult chondrocytes was not significantly changed when chondrocytes were first grown in monolayer culture, harvested, and then inserted in the clonal culture system. However, the adult chondrocytes showed a time-dependent decrease of stimulation of clonal growth by IGF I and II. This was not true for fetal chondrocytes. The results are compatible with the concept that IGF II is a more potent stimulant of clonal growth of chondrocytes during fetal life, whereas IGF I is more effective in stimulating clonal growth of chondrocytes during postnatal life.
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