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Sökning: WFRF:(Turunen L) > (2002-2004)

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1.
  • Kohler, M, et al. (författare)
  • On-line monitoring of apoptosis in insulin-secreting cells
  • 2003
  • Ingår i: Diabetes. - : American Diabetes Association. - 0012-1797 .- 1939-327X. ; 52:12, s. 2943-2950
  • Tidskriftsartikel (refereegranskat)abstract
    • Apoptosis was monitored in intact insulin-producing cells both with microfluorometry and with two-photon laser scanning microscopy (TPLSM), using a fluorescent protein based on fluorescence resonance energy transfer (FRET). TPLSM offers three-dimensional spatial information that can be obtained relatively deep in tissues. This provides a potential for future in vivo studies of apoptosis. The cells expressed a fluorescent protein (C-DEVD-Y) consisting of two fluorophores, enhanced cyan fluorescent protein (ECFP) and enhanced yellow fluorescent protein (EYFP), linked by the amino acid sequence DEVD selectively cleaved by caspase-3–like proteases. FRET between ECFP and EYFP in C-DEVD-Y could therefore be monitored on-line as a sensor of caspase-3 activation. The relevance of using caspase-3 activation to indicate β-cell apoptosis was demonstrated by inhibiting caspase-3–like proteases with Z-DEVD-fmk and thereby showing that caspase-3 activation was needed for high-glucose–and cytokine-induced apoptosis in the β-cell and for staurosporine-induced apoptosis in RINm5F cells. In intact RINm5F cells expressing C-DEVD-Y and in MIN6 cells expressing the variant C-DEVD-Y2, FRET was lost at 155 ± 23 min (n = 9) and 257 ± 59 min (n = 4; mean ± SE) after activation of apoptosis with staurosporine (6 μmol/l), showing that this method worked in insulin-producing cells.
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