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• W2896592617 startingPage "539" @default.
• W2896592617 abstract "Abstract Background Translating efficacy of analgesic drugs from animal models to humans remains challenging. Reasons are multifaceted, but lack of sufficiently rigorous preclinical study design criteria and phenotypically relevant models may be partly responsible. To begin to address this fundamental issue, we assessed the analgesic efficacy of morphine in three inbred rat strains (selected based on stress reactivity and affective/pain phenotypes), and outbred Sprague Dawley ( SD ) rats supplied from two vendors. Methods Sensitivity to morphine (0.3–6.0 mg/kg, s.c.) was evaluated in the hot plate test of acute thermal nociception, the Complete Freund's Adjuvant ( CFA ) model of inflammatory‐induced mechanical hyperalgesia, and in a locomotor motility assay in male rats from the following strains; Lewis ( LEW ), Fischer (F344), Wistar Kyoto ( WKY ), and SD 's from Envigo and Charles River. Results F344 and SD rats were similarly sensitive to morphine in hot plate and CFA ‐induced inflammatory hyperalgesia (Minimum Effective Dose ( MED ) = 3.0 mg/kg). WKY rats developed a less robust mechanical hypersensitivity after CFA injection, and were less sensitive to morphine in both pain tests ( MED = 6.0 mg/kg). LEW rats were completely insensitive to morphine in the hot plate test, in contrast to the reversal of CFA ‐induced hyperalgesia ( MED = 3.0 mg/kg). All strains exhibited a dose‐dependent reduction in locomotor activity at 3.0–6.0 mg/kg. Conclusion Sensory phenotyping in response to acute thermal and inflammatory‐induced pain, and sensitivity to morphine in various inbred and outbred rat strains indicates that different pathophysiological mechanisms are engaged after injury. This could have profound implications for translating preclinical drug discovery efforts into pain patients. Significance The choice of rat strain used in preclinical pain research can profoundly affect the outcome of experiments in relation to (a) nociceptive threshold responses, and (b) efficacy to analgesic treatment, in assays of acute and tonic inflammatory nociceptive pain." @default.
• W2896592617 created "2018-10-26" @default.
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• W2896592617 date "2018-11-09" @default.
• W2896592617 modified "2023-10-18" @default.
• W2896592617 title "The analgesic efficacy of morphine varies with rat strain and experimental pain model: implications for target validation efforts in pain drug discovery" @default.
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• W2896592617 doi "https://doi.org/10.1002/ejp.1327" @default.
• W2896592617 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6587867" @default.
• W2896592617 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/30318662" @default.
• W2896592617 hasPublicationYear "2018" @default.
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