PMID: 9539682Apr 16, 1998Paper

Genetic variance in nociception and its relationship to the potency of morphine-induced analgesia in thermal and chemical tests

Pain
G I ElmerJ H Woods

Abstract

The perceived intensity of a painful stimulus is determined in part by the stimulus intensity and environmental conditions. The purpose of this study was to determine the influence of genetic factors in nociception and its contribution to the potency of morphine to produce antinociception. Eight inbred strains of mice were tested across a range of stimulus intensities in thermal (hot plate) and chemical irritant (acetic acid) nociceptive tests. Stimulus intensities in the thermal test included hot plate temperatures of 51, 53, 55, 57 and 59 degrees C. Stimulus intensities in the chemical irritant test included acetic acid concentrations of 0.1, 0.3 and 0.6%. Linear interpolation of stimulus-effect curves revealed large genotype-dependent differences in the effective temperature resulting in a 10 s latency on the hot-plate (ET10") and the acetic acid concentration resulting in the same number of writhes as determined by the area under the curve (AUC50). There was no genetic correlation between sensitivity to thermal versus chemical stimuli. Morphine dose response curves were then determined at a fixed stimulus intensity in each test (55 degrees C and 0.6% acetic acid) to determine analgesic ED50 doses for each inbred strain. A s...Continue Reading

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