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Monolayer islet cells prepared from neonatal rat pancreases were cultured in media with 5.5 mM glucose alone or further supplemented with 5 mM 3-amino-3-deoxyglucose (3A3dG) for a total of 7 days. After culture for 7 days, 3A3dG-supplementation maintained the recovery of insulin released into the medium during the last 2 days of a 7-day culture at a level 2.9 fold higher that at day 0. Similarly, the insulin content of the cells was significantly higher than the initial level at day 0 (2.8-fold) and that of the cells grown in medium with glucose alone (4.5-fold). The maximum secretory responses to glucose (2.8-16.7 mM), leucine (2.5-10 mM) and 2-ketoisocaproate (2.5-10 mM) were several times as high as the initial. Further, 3A3dG caused a selective deletion of fibroblasts mostly consisting of endocrine cells. In these monolayer cells, either the cAMP response to glucose or the cellular cAMP content were significant. In conclusion, it is suggested that the beneficial effect of 3A3dG may be associated with an increase in either the oxidative catabolism of amino acids or the activity of adenylate cyclase in the B cell.

Maintenance of pancreatic endocrine cells of the neonatal rat: IV. The effect of 3-amino-3-deoxyglucose.