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British Journal of Pharmacology logoLink to British Journal of Pharmacology
. 1992 Oct;107(2):573–576. doi: 10.1111/j.1476-5381.1992.tb12785.x

Effects of the delta-opioid receptor antagonist naltrindole on antinociceptive responses to selective delta-agonists in post-weanling rats.

T J Crook 1, I Kitchen 1, R G Hill 1
PMCID: PMC1907854  PMID: 1330187

Abstract

1. Antagonism, by the selective delta-opioid receptor antagonist naltrindole, of the antinociceptive effects of [D-Pen2, D-Pen5] enkephalin (DPDPE), [D-Ser2, Leu5, Thr6] enkephalin (DSLET) and D-Ala2 deltorphin I (DELT I) has been studied in 25 day old rats. 2. Antinociception was measured by the 50 degrees C tail immersion test following i.p. administration of agonists and/or antagonists. 3. Dose-related antinociception was observed with DPDPE, DSLET and DELT I and ED75 doses were computed (0.66 mg kg-1, 0.65 mg kg-1, 0.032 mg kg-1 respectively) and used for antagonism studies. 4. Naltrindole (0.01 mg kg-1) significantly attenuated the antinociceptive effects of DPDPE and DSLET with 0.1 mg kg-1 producing complete reversal of the effects of the ED75 dose. In contrast, naltrindole at 0.01 and 0.1 mg kg-1 did not alter antinociceptive responses to DELT I. Naltrindole at 1 mg kg-1 significantly attenuated DELT I antinociception. 5. Naloxone (1 mg kg-1) produced equivalent degrees of antagonism of the antinociceptive effects of DPDPE, DSLET and DELT I. ICI 174,864 (1 mg kg-1) also antagonized antinociception with a differential degree of attenuation (DSLET > DPDPE > DELT I). 6. Naltrindole (1 mg kg-1) had no effect on the antinociception induced by the selective mu-agonist alfentanil (60 micrograms kg-1). Naltrindole, naloxone or ICI 174,864 had no effect on nociceptive latencies. 7. The differential antagonism by naltrindole of the effects of three selective delta-agonists suggests delta-receptor heterogeneity.(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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