Increased Methylation of the MOR Gene Proximal Promoter in Primary Sensory Neurons Plays a Crucial Role in the Decreased Analgesic Effect of Opioids in Neuropathic Pain
| Autor: | Jun-Li Cao, Min Yan, Yu-Nan Peng, Li-hui Tang, Lina Yu, Yin Wang, Xuelong Zhou |
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| Rok vydání: | 2014 |
| Předmět: |
Pain Threshold
Sensory Receptor Cells Analgesic Receptors Opioid mu Pharmacology Decitabine Neuropathic pain Methylation Mice Neuroblastoma Cellular and Molecular Neuroscience Dorsal root ganglion Cell Line Tumor Ganglia Spinal polycyclic compounds medicine Animals Enzyme Inhibitors Promoter Regions Genetic Pain Measurement Regulation of gene expression Dose-Response Relationship Drug Morphine business.industry Research Opioids Disease Models Animal Anesthesiology and Pain Medicine medicine.anatomical_structure Gene Expression Regulation Spinal Cord nervous system Opioid Hyperalgesia Azacitidine Neuralgia Molecular Medicine CpG Islands Epigenetics medicine.symptom μ-opioid receptor business human activities medicine.drug |
| Zdroj: | Molecular Pain |
| ISSN: | 1744-8069 |
| DOI: | 10.1186/1744-8069-10-51 |
| Popis: | Background The analgesic potency of opioids is reduced in neuropathic pain. However, the molecular mechanism is not well understood. Results The present study demonstrated that increased methylation of the Mu opioid receptor (MOR) gene proximal promoter (PP) in dorsal root ganglion (DRG) plays a crucial role in the decreased morphine analgesia. Subcutaneous (s.c.), intrathecal (i.t.) and intraplantar (i.pl.), not intracerebroventricular (i.c.v.) injection of morphine, the potency of morphine analgesia was significantly reduced in nerve-injured mice compared with control sham-operated mice. After peripheral nerve injury, we observed a decreased expression of MOR protein and mRNA, accompanied by an increased methylation status of MOR gene PP, in DRG. However, peripheral nerve injury could not induce a decreased expression of MOR mRNA in the spinal cord. Treatment with 5-aza-2′-deoxycytidine (5-aza-dC), inhibited the increased methylation of MOR gene PP and prevented the decreased expression of MOR in DRG, thereby improved systemic, spinal and periphery morphine analgesia. Conclusions Altogether, our results demonstrate that increased methylation of the MOR gene PP in DRG is required for the decreased morphine analgesia in neuropathic pain. |
| Databáze: | OpenAIRE |
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