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- W2144913036 abstract "The major regulator of the gap-1/synthesis phase (G1/S) cell cycle checkpoint is the retinoblastoma protein (pRb), and this is regulated in part by the activities of cyclin-dependent kinase (cdk)-4 and the D cyclins. Surprisingly, given the potential importance of β-cell replication for islet replacement therapy, pRb presence, phosphorylation status, and function have not been explored in β-cells. Here, adenoviruses expressing cdk-4 and cyclin D1 were used to explore rat and human pRb phosphorylation and β-cell cycle control. pRb is present in rat and human islets, and overexpression of cyclin D1/cdk-4 led to strikingly enhanced pRb phosphorylation in both species. Combined overexpression of both cdk-4 and cyclin D1 caused a threefold increase in [3H]thymidine incorporation. This increase in proliferation was confirmed independently using insulin and bromodeoxyuridine immunohistochemistry, where human β-cell replication rates were increased 10-fold. Cdk-4 or cyclin D1 overexpression did not adversely effect β-cell differentiation or function. The key cell cycle regulatory protein, pRb, can be harnessed to advantage using cyclin D1/cdk-4 for the induction of human and rodent β-cell replication, enhancing replication without adversely affecting function or differentiation. This approach will allow detailed molecular study of the cellular mechanisms regulating the cell cycle in β-cells, β-cell lines, and stem cell-derived β-cells." @default.
- W2144913036 created "2016-06-24" @default.
- W2144913036 creator A5006892022 @default.
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- W2144913036 date "2004-01-01" @default.
- W2144913036 modified "2023-09-25" @default.
- W2144913036 title "Induction of β-Cell Proliferation and Retinoblastoma Protein Phosphorylation in Rat and Human Islets Using Adenovirus-Mediated Transfer of Cyclin-Dependent Kinase-4 and Cyclin D1" @default.
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- W2144913036 doi "https://doi.org/10.2337/diabetes.53.1.149" @default.
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