IGF1

CYTOKINES AND GROWTH FACTORS

Recombinant Human Insulin Like Growth Factor-1

The somatomedins, or insulin-like growth factors (IGFs), comprise a family of peptides that play important roles in mammalian growth and development. IGF1 mediates many of the growth-promoting effects of growth hormone (GH, MIM 139250). Early studies showed that growth hormone did not directly stimulate the incorporation of sulfate into cartilage, but rather acted through a serum factor, termed 'sulfation factor, ' which later became known as 'somatomedin' (Daughaday et al., 1972). Three main somatomedins have been characterized: somatomedin C (IGF1), somatomedin A (IGF2, MIM 147470), and somatomedin B (MIM 193190) (Rotwein, 1986, Rosenfeld, 2003).

The activity as determined by the dose-dependent proliferation of mouse FDC-P1 is less than 1.0 ng/ml, corresponding to a specific activity of 1x10⁶ units/mg.