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. 1993 Apr;108(4):967–973. doi: 10.1111/j.1476-5381.1993.tb13493.x

Cholecystokinin as a factor in the enhanced potency of spinal morphine following carrageenin inflammation.

L C Stanfa 1, A H Dickenson 1
PMCID: PMC1908163  PMID: 8485635

Abstract

1. Cholecystokinin (CCK) has been shown to diminish opioid analgesia. Here we investigate whether changes in the physiological levels of spinal CCK are responsible for the enhanced potency of spinal morphine in animals following carrageenin inflammation, as compared with normal animals. 2. Single dorsal horn nociceptive neurones were recorded in intact halothane-anaesthetized rats in the presence and absence of carrageenin-induced inflammation and comparisons were made between the two groups of animals. Inflammation was induced by the injection of 100 microliters of 2% lambda-carrageenin into the hind paw. 3. The inhibitory effect of intrathecal morphine on the C-fibre-evoked responses of the neurones was enhanced in the carrageenin-treated animals such that the effects of 0.25 microgram and 10 micrograms of morphine in normal animals were comparable to those of 0.01 microgram and 2.5 micrograms in the carrageenin animals. The effect of 0.2 mg kg-1 of the CCKB antagonist, L-365,260, on the antinociceptive potency of intrathecal morphine was examined in both groups of animals. In normal animals, L-365,260 produced a significant enhancement in the effect of morphine indicating a tonic CCK modulation in these animals, but it had no effect on the inhibitions produced by either dose of morphine in the carrageenin animals. 4. The inhibition of the C-fibre-evoked response produced by intrathecal morphine in the presence of 1 microgram of CCK was examined in both groups of animals. CCK attenuated the effects of morphine only in animals with carrageenin inflammation, having no effect on the action of morphine in normal animals.(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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