Substitution at the 8-position of 3″-deoxy-cyclic ADP-carbocyclic-ribose, a highly potent Ca2+-mobilizing agent, provides partial agonists1

We previously showed that 3″-deoxy-cyclic ADP-carbocyclic-ribose (3″-deoxy-cADPcR, 4) is a stable and highly potent analogue of cyclic ADP-ribose (cADPR, 1), a Ca2+-mobilizing second messenger. From these results, we designed and synthesized other 3″-modified analogues of cADPcR having a substituent at the 8-position and found that this modification at the 8-position made them partial agonists. Among these compounds, 8-NH2-3″-deoxy-cADPcR (10) was identified as a potent partial agonist with an EC50 value of 17 nM.

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