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Several genetic mouse models of differential sensitivity to opioids have been used to investigate the mechanisms underlying individual variation in responses to opioids. The CXBK mice are inbred recombinant mice which have a lower level of μ 1 -opioid receptors than their parental strain. Endomorphin-1 and endomorphin-2 are endogenous opioid peptides that are highly selective for μ-opioid...
There appear to be different relationships between μ-opioid receptor densities and the acute and neuroadaptive μ-opioid agonist-induced responses of the multiple opioid neuronal systems, including important pons/medulla circuits. The recent success in creating μ-opioid receptor knockout mice allows studies of μ-opioid agonist-induced pharmacological and physiological effects in animals that express...
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