Abstract
The formation of the non-sulphated glycosaminoglycan hyaluronan by cells of the renal glomerulus in diabetes may contribute to altered matrix composition. We describe an increased production of hyaluronan from mesangial cell-enriched glomerular cores from diabetic animals, and further show that increased hyaluronan production follows the exposure of non-diabetic and diabetic preparations to fibronectin and to platelet-derived growth factor in vitro. Hyaluronan production appeared dependent on protein kinase C activity, and could not be shown after prolonged phorbol ester preincubation. Stimulation by fibronectin was wholly dependent on cyclooxygenase activity and prior prostaglandin production, while the effect of platelet-derived growth factor showed only a partial dependence.
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