Pure and Applied Chemistry

Abstract: A series of cyclic ADP-ribose (cADPR) analogs, in which modifications mainly focused on riboses, was synthesized in order to explore the molecular mechanism of calcium release regulated by cADPR. Biological activities investigated in intact T-lymphocytes showed that the structurally simplified analogs, N1-ethoxymethyl-substituted cyclic inosine diphosphoribose (cIDPRE), N1,N9-diethoxymethyl-substituted cyclic inosine diphosphoribose (cIDPDE), and N1-ethoxymethyl-substituted cyclic adenosine diphosphoribose (cADPRE) in which the northern ribose or both northern and southern riboses were replaced by ether linkages are membrane-permeant and induce calcium release from intracellular stores. This research has provided novel molecules to probe cADPR-mediated calcium signaling and enlarges our knowledge of the structure-activity relationships of cADPR analogs.