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Cyclic ADP-ribose was measured by a radioimmunological procedure in rat pancreatic islets. The cyclic ADP-ribose content of the islets was much lower immediately after isolation (< or = 2.3 +/- 0.2 fmol/islet) than after a further incubation of 90 min in a salt-balanced medium (26.4 +/- 1.3 fmol/islet). Under the latter condition, the islet cyclic ADP-ribose content was not affected by the concentration of D-glucose and/or D-fructose in the incubation medium and, when expressed per micrograms protein, was 3- to 30-fold higher than that found in other biological samples such as liver, whole pancrease or tumoral islet cells. Although these findings might suggest a physiological role for cyclic ADP-ribose in islet cells, they argue against the view that the cyclic nucleotide acts as a coupling factor in the process of hexosestimulated insulin release.
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