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• W2079412970 abstract "Transformed, insulin-secreting endocrine cells have been proposed as an alternative to islets for the development of a bioartificiat pancreas. With appropriate immunoprotection, such cells may be implanted without the need for patient immunosuppression. Use of continuous cell lines alleviates the cell availability limitation, but poses questions regarding thestability and biochemical and secretory function of the preparation, especially in the longterm. We have developed a bioreactor/perfusion system, compatible with a horizontal-bore NMR instrument, that can maintain immunoprotected endocrine cells for prolonged periods of time. 31P NMR spectroscopy was used to study the bioenergetics of recombinant, insulin-secreting mouse pituitary AtT-20 cells entrapped as spheroids in calcium alginate/poly-L-lysine/alginate beads. NMR provided data verifying the macroscopic homogeneity within the bioreactor and allowing the evaluation of changes in cellular bioenergetics for a period of 70 days under different culture conditions. Levels of high-energy phosphates changed slightly during the first 40 days of the experiment, then decreased considerably as cell death occurred. Rates of glucose consumption and insulin-related peptide secretion also remained constant for 40 days and decreased rapidly thereafter. This study constitutes the beginning of an extensive quantitative analysis of the biochemistry of transformed endocrine cell lines in a sequestered, artificial tissue environment. © 1995 John Wiley & Sons Inc." @default.
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• W2079412970 date "1995-08-20" @default.
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• W2079412970 title "Towards the development of artificial endocrine tissues:31P NMR spectroscopic studies of immunoisolated, insulin-secreting AtT-20 cells" @default.
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• W2079412970 doi "https://doi.org/10.1002/bit.260470404" @default.
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