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- W2006107991 abstract "Assessing islet cellular composition and beta cell viability using Flow Cytometry (FC) and Laser Scanning Cytometry (LSC) may aid in determining the transplant quality of islets. Human islets (2500 IEQ, n = 44, purity >or=80%) dissociated into a single cell suspension were stained with ductal marker CA19, with Newport Green (NG) and FluoZin3 (FL3) for beta-cell identification, with TMRE to assess mitochondrial membrane potential, with DAPI to identify live vs. dead cells, and with Annexin-V/DAPI to differentiate apoptotic and necrotic cells. For LSC, cell preparations (n = 9) were stained for insulin (beta-cells), glucagon (alpha-cells), somatostatin (delta cells), and pancreatic polypeptide (ppp cells). Fluorescence microscopy (EtBr/FDA) and insulin response were also measured. DAPI- staining was 73.78% +/- 1.37, while EtBr/FDA was 96% +/- 0.48. 52.5% +/- 3.73 of all cells were NG+, of which 58.08% +/- 2.61 were NG+/TMRE+. Annexin-V/DAPI staining (n = 26) showed 13.8% +/- 0.89 apoptotic, 27.2% +/- 2.0 necrotic, and 51.9% +/- 2.22 live cells. 26.0% +/- 5.19 of cells were CA19 positive (n = 17), of which 45.5% +/- 4.37 were also TMRE+, and 5.2% +/- 1.2 of the TMRE+ were also NG+/CA19+. NG and FL3 showed similar staining (n = 8). Comparison of short-term (<or=2 days) versus long-term (>or=3 days) culture showed similar TMRE+/NG+ averages, albeit lower percentages of live (36.4% vs 51.9%), and higher percentages of apoptotic (19.2% vs 13.8%) and necrotic cells (37.4% vs 27.2%) for long-term, as determined by Annexin-V staining. LSC resulted in 54.17% +/- 4.62 beta-cells, 33.33% +/- 4.16 alpha-cells, 8.75% +/- 2.5 delta-cells, and 3.75% +/- 0.79 ppp cells. There is no significant difference between insulin positive cells and NG positive cells (P <or= .55). FC and LSC provide valuable information about islet quality, which could potentially be used for evaluating islets prior to transplantation." @default.
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- W2006107991 date "2008-03-01" @default.
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- W2006107991 title "Comprehensive Analysis of Human Pancreatic Islets Using Flow and Laser Scanning Cytometry" @default.
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- W2006107991 doi "https://doi.org/10.1016/j.transproceed.2008.01.037" @default.
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