Abstract
Non-insulin-dependent diabetes mellitus is characterized by concurrent loss of beta-cells and deposition of islet amyloid derived from islet amyloid polypeptide (IAPP). We have previously demonstrated that IAPP-derived amyloid forms intracellularly in humans with chronic excess insulin expression (eg, insulinoma and insulin receptor antibody-induced insulin resistance). To determine whether overexpression of IAPP results in intracellular amyloid in mammalian cells, we transfected COS cells with vectors expressing amyloidogenic human IAPP or non-amyloidogenic rat IAPP. Transfected COS-1 cells secreted comparable amounts of human IAPP and rat IAPP (2.1 to 2.8 nmol/L/48 hours). After 96 hours, 90% of cells expressing human IAPP contained amyloid fibrils and were degenerating or dead, whereas cells transfected with rat IAPP lacked amyloid and were viable. Thus, overexpression of human IAPP can result in intracellular amyloid formation that is associated with cell death, suggesting that intracellular amyloid may play a role in beta-cell loss in non-insulin-dependent diabetes mellitus.
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Selected References
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