Effects of codeine, naproxen and dexamethasone on formalin-induced pain in the naked mole-rat

A DILUTE solution of formalin (20 μ1 of 10% formalin) was injected subcutaneously in the dorsal right hind paw of the naked mole-rat. The injection of the dilute formalin produced two periods of pain behaviour, the early (0–5 minutes) and the late phase (25–60 minutes). These were quantified as the...

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Veröffentlicht in:Neuroreport 1993-01, Vol.4 (1), p.25-28
Hauptverfasser: Karim, Farzana, Kanui, Titus Ikusya, Mbugua, Susan
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Kanui, Titus Ikusya
Mbugua, Susan
description A DILUTE solution of formalin (20 μ1 of 10% formalin) was injected subcutaneously in the dorsal right hind paw of the naked mole-rat. The injection of the dilute formalin produced two periods of pain behaviour, the early (0–5 minutes) and the late phase (25–60 minutes). These were quantified as the total time spent licking the injected paw. Codeine phosphate (10, 25 or 50 mg kg) significantly reduced pain behaviour in both the early and late phase. Codeine administration also induced aggressive, hyperactive behaviour and motor impairment that was nalox-one (2 mg kg) reversible. Naproxen (200 mg kg) and dexamethasone phosphate (30 mg kg) significantly reduced licking activity in the late phase only.
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The injection of the dilute formalin produced two periods of pain behaviour, the early (0–5 minutes) and the late phase (25–60 minutes). These were quantified as the total time spent licking the injected paw. Codeine phosphate (10, 25 or 50 mg kg) significantly reduced pain behaviour in both the early and late phase. Codeine administration also induced aggressive, hyperactive behaviour and motor impairment that was nalox-one (2 mg kg) reversible. Naproxen (200 mg kg) and dexamethasone phosphate (30 mg kg) significantly reduced licking activity in the late phase only.</description><subject>Animals</subject><subject>Behavior, Animal - drug effects</subject><subject>Behavioral psychophysiology</subject><subject>Biological and medical sciences</subject><subject>Codeine - pharmacology</subject><subject>Dexamethasone - pharmacology</subject><subject>Dose-Response Relationship, Drug</subject><subject>Formaldehyde</subject><subject>Fundamental and applied biological sciences. 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Psychology</topic><topic>Heterocephalus glaber</topic><topic>Injections, Intraperitoneal</topic><topic>Injections, Subcutaneous</topic><topic>Miscellaneous</topic><topic>Muscle Rigidity - chemically induced</topic><topic>Naloxone - pharmacology</topic><topic>Naproxen - pharmacology</topic><topic>Pain - chemically induced</topic><topic>Pain - prevention &amp; control</topic><topic>Psychology. Psychoanalysis. Psychiatry</topic><topic>Psychology. 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subjects Animals
Behavior, Animal - drug effects
Behavioral psychophysiology
Biological and medical sciences
Codeine - pharmacology
Dexamethasone - pharmacology
Dose-Response Relationship, Drug
Formaldehyde
Fundamental and applied biological sciences. Psychology
Heterocephalus glaber
Injections, Intraperitoneal
Injections, Subcutaneous
Miscellaneous
Muscle Rigidity - chemically induced
Naloxone - pharmacology
Naproxen - pharmacology
Pain - chemically induced
Pain - prevention & control
Psychology. Psychoanalysis. Psychiatry
Psychology. Psychophysiology
Rodentia - physiology
title Effects of codeine, naproxen and dexamethasone on formalin-induced pain in the naked mole-rat
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