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Proteomic Analysis Of Mouse Islets After Multiple Low-dose Streptozotocin Injection.
X. Xie, S. Li, S. Liu, Y. Lu, P. Shen, J. Ji
Published 2008 · Chemistry, Medicine
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The islets of Langerhans are scattered throughout the pancreas and play a major role in the control of metabolic fuel homeostasis. To get a better understanding of the mechanisms underlying type 1 diabetes mellitus, we have generated a mouse model by injections of multiple low-dose streptozotocin. The islets in the mouse pancreas were handpicked and proteins from the islets were then isolated and separated by two-dimensional gel electrophoresis. Seven proteins were found to be altered significantly at expression level. Among the seven proteins, four were up-regulated and three were down-regulated in diabetic mice as compared with controls. These proteins were successfully identified by matrix-assisted laser desorption/ionization-time of flight mass spectrometry and the changes of selected protein expression were further validated by quantitative real time PCR and Western blotting. Voltage-dependent anion-selective channel protein 1 and peroxiredoxin-4 were found for the first time to be associated with type 1 diabetes mellitus in mouse islets in the current study. These results suggest that glucose transport, beta cell proliferation/death, and oxidative stress play important roles in maintaining the balance of glucose level. Our study also provides novel insight into the mechanism of type 1 diabetes mellitus.
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