Tissue Culture of Human Fetal Pancreas: Growth Hormone Stimulates the Formation and Insulin Production of Islet-Like Cell Clusters*

The human fetal pancreas (HFP) is a potential source of insulin-producing B-cells for transplantation to insulin-dependent diabetic patients. We recently described a technique for culturing HFP tissue in vitro which results in the development of islet-like cell clusters (ICC). These clusters exhibited (pro)insulin biosynthesis and a modest rate of insulin secretion, and immunocytochemical staining indicated the presence of insulin-positive cells in the cell clusters. In this study this technique was used to evaluate the effects of the addition of 1000 μg/L GH to HFP cultured in medium RPMI-1640 plus 10% human serum. ICCs developed in 21 of 33 consecutive cultures. GH increased the yield of ICC by 35% compared to explants supplemented with human serum alone. The insulin content of the ICCs also was increased, but the size of individual ICCs was not affected by GH, as reflected by an unchanged DNA content. GH also caused increased insulin release when the ICCs were stimulated with 16.7 DIM glucose plus 5 mM...