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Morphine and Fentanyl Differently Affect MOP and NOP Gene Expression in Human Neuroblastoma SH-SY5Y Cells

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Abstract

Morphine is widely used for the treatment of severe acute and chronic pain, but long-term therapy rapidly leads to tolerance. Morphine effects are mediated by μ opioid receptor (MOP) activation as well as for fentanyl that, in contrast to morphine, induces less tolerance to analgesia. The mechanisms underlying opioid tolerance involve complex processes, such as MOP desensitization, internalization, and/or changes of gene expression. The development of morphine tolerance also involves adaptive changes of the anti-opioid nociceptin/orphanin FQ–nociceptin receptor system, as suggested by the reduction of morphine tolerance in nociceptin opioid receptor (NOP) knockout mice. The aim of the present study was to investigate the MOP and NOP gene expression in the SH-SY5Y cells following morphine and fentanyl exposure. Results showed that cell exposure to 10 μM morphine for 5 h induced a significant decrease of MOP and NOP gene expression and that the MOP downregulation was reverted by the pretreatment with naloxone. Conversely, SH-SY5Y cells exposed to 0.1 and 1 μM fentanyl for 5 and 72 h showed a significant MOP upregulation, also reverted by naloxone pretreatment. Fentanyl induced no changes of NOP gene expression. The present findings showed a different effect by morphine and fentanyl on MOP mRNA levels that contributes to define the role of MOP gene expression changes in the mechanisms underlying the tolerance. Morphine also triggers an altered NOP-related signaling confirming that the nociceptin/orphanin FQ–nociceptin receptor system also plays a significant role in the development of morphine tolerance.

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Authors and Affiliations

  1. Department of Pharmacy and Biotechnology, Alma Mater Studiorum, University of Bologna, Via Irnerio, 48, 40126, Bologna, Italy

    Francesca Felicia Caputi, Francesca Lattanzio, Donatella Carretta, Daniela Mercatelli, Sanzio Candeletti & Patrizia Romualdi

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  1. Francesca Felicia Caputi
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  2. Francesca Lattanzio
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  3. Donatella Carretta
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  4. Daniela Mercatelli
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  5. Sanzio Candeletti
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  6. Patrizia Romualdi
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Corresponding author

Correspondence to Patrizia Romualdi.

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Francesca Felicia Caputi and Francesca Lattanzio contributed equally to this work.

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Caputi, F.F., Lattanzio, F., Carretta, D. et al. Morphine and Fentanyl Differently Affect MOP and NOP Gene Expression in Human Neuroblastoma SH-SY5Y Cells. J Mol Neurosci 51, 532–538 (2013). https://doi.org/10.1007/s12031-013-0019-3

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  • DOI: https://doi.org/10.1007/s12031-013-0019-3

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