Abstract
The effect of morphine on the cyclic (c) AMP and cyclic (c) GMP concentrations in several organs, and its reversal by naloxone have been investigated in C57BL and DBA strains of mice. Morphine increased the cAMP contents in lungs and muscle, and the cGMP contents in lungs, intestine, heart, liver and muscle in a naloxone-reversible way in C57BL mice only. This is consistent with our previous observation that morphine increased plasma cyclic nucleotide levels in C57BL mice, whereas such an increase was marginal in the DBA strain. These results show that there is a strain difference in the effect of morphine on tissue cyclic nucleotide contents and the possible origin of the plasma cyclic nucleotides which are increased by morphine.
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