Abstract:
BACKGROUND:N-methyl-D-aspartate receptor (NMDARs)-dependent central sensitization plays an important role in cancer pain. Binding of NMDAR subunit 2B (NR2B) by postsynaptic density protein-95 (PSD-95) can couple NMDAR activity to intracellular enzymes, such as neuronal nitric oxide synthase (nNOS), facilitate downstream signaling pathways, and modulate NMDAR stability, contributing to synaptic plasticity. In this study, we investigated whether perturbing the specific interaction between spinal NR2B-containing NMDAR and PSD-95, using a peptide-mimetic strategy, could attenuate bone cancer-related pain behaviors. METHODS:Osteosarcoma cells were implanted into the intramedullary space of the right femurs of C3H/HeJ mice to induce progressive bone cancer-related pain behaviors. Western blotting was applied to examine the expression of spinal phospho-Tyr1472 NR2B, nNOS, and PSD-95. We further investigated the effects of intrathecal injection of the mimetic peptide Myr-NR2B9c, which competitively disrupts the interaction between PSD-95 and NR2B, on nociceptive behaviors and on the upregulation of phospho-Tyr1472 NR2B, nNOS, and PSD-95 associated with bone cancer pain in the spinal cord. RESULTS:Inoculation of osteosarcoma cells induced progressive bone cancer pain and resulted in a significant upregulation of phospho-Tyr1472 NR2B, nNOS, and PSD-95. Intrathecal administration of Myr-NR2B9c attenuated bone cancer-evoked mechanical allodynia, thermal hyperalgesia, and reduced spinal phospho-Tyr1472 NR2B, nNOS, and PSD-95 expression. CONCLUSIONS:Intrathecal administration of Myr-NR2B9c reduced bone cancer pain. Internalization of spinal NR2B and dissociation NR2B-containing NMDARs activation from downstream nNOS signaling may contribute to the analgesic effects of Myr-NR2B9c. This approach may circumvent the negative consequences associated with blocking NMDARs, and may be a novel strategy for the treatment of bone cancer pain.
journal_name
Anesth Analgjournal_title
Anesthesia and analgesiaauthors
Liu Y,Cui X,Sun YE,Yang X,Ni K,Zhou Y,Ma Z,Gu Xdoi
10.1213/ANE.0000000000000202subject
Has Abstractpub_date
2014-06-01 00:00:00pages
1345-54issue
6eissn
0003-2999issn
1526-7598pii
00000539-201406000-00026journal_volume
118pub_type
杂志文章abstract:BACKGROUND:Anesthesiologists and certified registered nurse anesthetists (CRNAs) must acquire the skills to recognize and manage a variety of acute intraoperative emergencies. A simulation-based assessment provides a useful and efficient means to evaluate these skills. In this study, we evaluated and compared the perfo...
journal_title:Anesthesia and analgesia
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abstract::Few anesthesia studies have explored perioperative continuous epidural infusion of neostigmine. We examined such a regimen in thoracotomy patients. Ninety patients were randomized to one of three groups in this double-blind trial. Before anesthesia induction, an epidural catheter was inserted in all patients at T5-8 l...
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journal_title:Anesthesia and analgesia
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journal_title:Anesthesia and analgesia
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journal_title:Anesthesia and analgesia
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journal_title:Anesthesia and analgesia
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journal_title:Anesthesia and analgesia
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journal_title:Anesthesia and analgesia
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journal_title:Anesthesia and analgesia
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journal_title:Anesthesia and analgesia
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journal_title:Anesthesia and analgesia
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journal_title:Anesthesia and analgesia
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journal_title:Anesthesia and analgesia
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journal_title:Anesthesia and analgesia
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journal_title:Anesthesia and analgesia
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