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The Journal of Immunology, Vol 155, Issue 7 3353-3359, Copyright © 1995 by American Association of Immunologists
ARTICLES |
AH Guse, CP da Silva, F Emmrich, GA Ashamu, BV Potter and GW Mayr
Department of Enzyme Chemistry, University of Hamburg, Germany.
Ca2+ release from intracellular stores is one of the major events transducing extracellular signals into living cells. Recently, a metabolite of nicotinamide adenine dinucleotide+ (NAD+), termed "cyclic adenosine diphosphate-ribose" (cADPr), has been described to release Ca2+ from caffeine-sensitive internal stores of cells. Jurkat T cells possess intracellular Ca2+ stores sensitive to caffeine, so a potential involvement of cADPr in Ca2+ signaling was investigated. cADPr released Ca2+ in a dose-dependent manner from intracellular stores of permeabilized Jurkat T cells. Half maximal release was obtained at 2.25 microM cADPr. Prior addition of D-myo-inositol 1,4,5-trisphosphate (Ins(1,4,5)P3) or thapsigargin did not influence cADPr-induced Ca2+ release, indicating the presence of different Ca2+ pools sensitive to Ins(1,4,5)P3 and cADPr. The specificity of the response was confirmed using the inhibitors ruthenium red, 8-NH2-cADPr, and 8-Br-cADPr. All three compounds blocked cADPr-induced, but not Ins(1,4,5)P3-induced, Ca2+ release in a dose-dependent manner. Cyclic GMP (cGMP)-induced Ca2+ release was also partly antagonized by ruthenium red, indicating involvement of a cGMP-dependent step in the formation of cADPr. The presence of endogenous cADPr was analyzed directly by HPLC. Sequential separation on strong anion exchange HPLC and reverse-phase, ion-pair HPLC resulted in a single symmetric peak co-eluting with standard cADPr. The identity of this endogenous material was further confirmed by its ability to release Ca2+ in saponin-permeabilized Jurkat T cells.
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