Modulation of collagen synthesis in human glomerular epithelial cells by interleukin 1.

Human glomerular epithelial cells produce matrix material e.g. collagen type IV. In vitro, the synthesis of collagen can be monitored by the incorporation of 3H-proline, a precursor molecule of the collagens. We report on the enhancement of collagen synthesis by glomerular epithelial cells with highly purified or recombinant I1-1. Since I1-1 is released from monocytes or glomerular mesangial cells by inflammatory mediators, our results point to a participation of I1-1 in the development of sclerosis, which is seen in many forms of chronic inflammatory diseases.