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Proteomic and transcriptomic analysis for streptozotocin-induced diabetic rat pancreas in response to fungal polysaccharide treatments.

Proteomics. 2008 Jun;8(11):2344-61. doi:10.1002/pmic.200700779
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摘要


In an attempt to search for novel biomarkers for monitoring diabetes prognosis, we examined the influence of the hypoglycemic fungal extracellular polysaccharides (EPS) on the differential change in pancreatic proteome and transcriptome in streptozotocin (STZ)-induced diabetic rats using 2-DE-based protein mapping and oligonucleotide microarray analysis. The 2-DE system separated more than 2000 individual spots, demonstrating that 34 proteins out of about 500 matched spots were differentially expressed. A total of 22 overexpressed and 12 underexpressed proteins in 2-DE map were observed (p<0.05) between the healthy and diabetic rats, of which 26 spots were identified by PMF analysis. Of these, significant down regulation of carbonyl reductase (Cbr), hydroxymethylglutaryl-CoA synthase (HMGCS), and putative human mitogen-activated protein kinase activator with WD repeats-binding protein (MAWDBP) in diabetic pancreas were reported for the first time in this study. When treated with EPS, all these four proteins were reverted to normal levels. The microarray analysis revealed that 96 out of 1272 genes were down- or up-regulated in the diabetic rats and the altered transcript levels of many of these genes were reversed after EPS treatment. In particular, generation in rat islets was significantly increased after STZ treatment, thereafter EPS treatment was likely to play a preventive role in beta-cell destruction mediated by STZ. Taken together, EPS may act as a potent regulator of gene expression for a wide variety of genes in diabetic rats, particularly in antioxidative stress, insulin biosynthesis, and cell proliferation.

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