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The Journal of Neuroscience, December 15, 2002, 22(24):10906-10913

Genetic Dissociation of Opiate Tolerance and Physical Dependence in delta -Opioid Receptor-1 and Preproenkephalin Knock-Out Mice

Joshua F. Nitsche1, Alwin G. P. Schuller1, Michael A. King2, Min Zengh1, Gavril W. Pasternak2, and John E. Pintar1

1 Department of Neuroscience and Cell Biology, University of Medicine and Dentistry of New Jersey-Robert Wood Johnson Medical School, Piscataway, New Jersey 08854, and 2 Laboratory of Neuropharmacology, Memorial Sloan-Kettering Cancer Center, New York, New York 10021

Previous experiments have shown that mice lacking a functional delta -opioid receptor (DOR-1) gene do not develop analgesic tolerance to morphine. Here we report that mice lacking a functional gene for the endogenous ligand preproenkephalin (ppENK) show a similar tolerance deficit. In addition, we found that the DOR-1 and ppENK knock-outs as well as the NMDA receptor-deficient 129S6 inbred mouse strain, which also lacks tolerance, exhibit antagonist-induced opioid withdrawal. These data demonstrate that although signaling pathways involving ppENK, DOR, and NMDA receptor are necessary for the expression of morphine tolerance, other pathways independent of these factors can mediate physical dependence. Moreover, these studies illustrate that morphine tolerance can be genetically dissociated from physical dependence, and thus provide a genetic framework to assess more precisely the contribution of various cellular and molecular changes that accompany morphine administration to these processes.

Key words: morphine; opiate; µ-opioid receptor; delta -opioid receptor; preproenkephalin; NMDA receptor; tolerance; dependence

Copyright © 2002 Society for Neuroscience  0270-6474/02/222410906-08$05.00/0


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