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We have investigated the effects of hormones and serum on glycosaminoglycan (GAG) synthesis, using cultured rat chondrocytes isolated from growing cartilage. Somatomedin A stimulated GAG synthesis at a physiological concentration, however in the case of insulin the dose required to stimulate GAG synthesis was 500 times as great as the physiological concentration. Parathyroid hormone also increased GAG synthesis. In contrast, hydrocortisone inhibited GAG synthesis at a pharmacological dosage. None of the following had any effect on GAG synthesis: epidermal growth factor, fibroblast growth factor, triiodothyronine, growth hormone, sex steroid or vitamin D3. Human serum up to a concentration of 1% stimulated GAG synthesis. Serum from patients with acromegaly stimulated GAG synthesis more than that from those with hypopituitarism.

Effects of somatomedin and other factors on glycosaminoglycan synthesis in cultured rat chondrocytes.