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- W2073283432 abstract "To investigate insulin secretion and content in islet β cells after intravenous glucose load in mice.Acute hyperglycemia (≥ 16.7 mmol/L) in C57BL/J6 mice was achieved by hyperglycemic clamp. Mice were divided into four groups: a 2-hour and a 4-hour high glucose-infusion (2 h-HG and 4 h-HG) with 25% dextrose groups and control groups with saline infusion of the same duration. Insulin levels and response were measured using intraperitoneal glucose tolerance test (IPGTT) in mice and glucose-stimulated insulin secretion (GSIS) for isolated islets after overnight culture. Immunohistochemistry and electron microscopy (EM) for islet β cells were used after the hyperglycemic clamp to study morphologic changes of insulin granules and to assess the impact of acute glucose load on islet histology.Blood glucose at 15, 30, 60 and 120 min was significantly higher in 4 h-HG compared with the other groups. Serum plasma insulin significantly decreased only at 15 min as a first-phase insulin response (FPIR). Insulin secretion at 2.8 and 16.7 mmol/L glucose stimulus in 4 h-HG group decreased 77% and 64% more than those in 2 h-HG, respectively (P < 0.05). Similarly, residual insulin content in islet β cells after 2.8 and 16.7 mmol/L glucose challenge decreased 30% and 43% more than those in 2 h-HG, respectively (P < 0.05). EM showed decreased insulin granules in islet cells and swollen mitochondria only in 4 h-HG.Short time intravenous glucose load blunted FPIRs and decreased insulin content of islet β cells." @default.
- W2073283432 created "2016-06-24" @default.
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- W2073283432 date "2006-01-01" @default.
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- W2073283432 title "We-S14:3 From CVD risk to cardiometabolic risk" @default.
- W2073283432 doi "https://doi.org/10.1016/s1567-5688(06)81346-2" @default.
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