PMID- 25550113 OWN - NLM STAT- MEDLINE DCOM- 20150925 LR - 20150121 IS - 1532-2777 (Electronic) IS - 0306-9877 (Linking) VI - 84 IP - 2 DP - 2015 Feb TI - Does modulation of spinal N-methyl-D-aspartic acid receptor by pre-activation accelerate the development of morphine tolerance? PG - 91-3 LID - S0306-9877(14)00456-3 [pii] LID - 10.1016/j.mehy.2014.12.012 [doi] AB - Repeated morphine administration usually leads to a number of neuroadaptive processes, including tolerance and sensitization. However, research has shown that the induction and maintenance of central sensitization is dependent on N-methyl-d-aspartic acid receptor (NMDAR) activation. Chronic morphine exposure has been shown to result in spinal sensitization and activation of spinal NMDARs. Chronic morphine treatment and the activation of spinal NMDARs may be synergistic and form a closed loop that may worsen the development of morphine analgesic tolerance and spinal sensitization. Inhibition of NMDARs with an antagonist could effectively alleviate the development of morphine analgesic tolerance. So, what is the effect of modulating spinal NMDAR activation with exogenous agonists or neuropathic input on the development of morphine-induced analgesic tolerance? Our hypothesis is that chronic morphine treatment may worsen the already activation of spinal NMDARs and spinal sensitization after agonist application or neuropathic input to shorten the process of morphine-induced analgesic tolerance. CI - Copyright (c) 2014 Elsevier Ltd. All rights reserved. FAU - Xu, Tao AU - Xu T AD - Department of Anesthesiology, Shanghai Jiaotong University Affiliated Shanghai Sixth People's Hospital, Shanghai 200233, China. FAU - Zhong, Wenhui AU - Zhong W AD - Department of Anesthesiology, Shanghai Jiaotong University Affiliated Shanghai Sixth People's Hospital, Shanghai 200233, China. FAU - Zhao, Jing AU - Zhao J AD - Department of Anesthesiology, Shanghai Jiaotong University Affiliated Shanghai Sixth People's Hospital, Shanghai 200233, China. FAU - Ma, Xiaqing AU - Ma X AD - Department of Anesthesiology, Shanghai Jiaotong University Affiliated Shanghai Sixth People's Hospital, Shanghai 200233, China. FAU - Zhao, Daqiang AU - Zhao D AD - Department of Anesthesiology, Shanghai Jiaotong University Affiliated Shanghai Sixth People's Hospital, Shanghai 200233, China. FAU - Jiang, Wei AU - Jiang W AD - Department of Anesthesiology, Shanghai Jiaotong University Affiliated Shanghai Sixth People's Hospital, Shanghai 200233, China. Electronic address: jiangw@sjtu.edu.cn. FAU - Zhang, Xiaoli AU - Zhang X AD - Department of Anesthesiology, Shanghai Jiaotong University Affiliated Shanghai Sixth People's Hospital, Shanghai 200233, China. Electronic address: balor@sjtu.edu.cn. LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't DEP - 20141220 PL - United States TA - Med Hypotheses JT - Medical hypotheses JID - 7505668 RN - 0 (Receptors, N-Methyl-D-Aspartate) RN - 6384-92-5 (N-Methylaspartate) RN - 76I7G6D29C (Morphine) SB - IM MH - Animals MH - Drug Tolerance/*physiology MH - Humans MH - Models, Neurological MH - *Morphine MH - N-Methylaspartate/pharmacology MH - Neuralgia/*metabolism MH - Neurons/*metabolism MH - Rats MH - Receptors, N-Methyl-D-Aspartate/antagonists & inhibitors/*metabolism MH - Spinal Nerve Roots/*cytology EDAT- 2015/01/01 06:00 MHDA- 2015/09/26 06:00 CRDT- 2015/01/01 06:00 PHST- 2014/10/27 00:00 [received] PHST- 2014/11/25 00:00 [revised] PHST- 2014/12/14 00:00 [accepted] PHST- 2015/01/01 06:00 [entrez] PHST- 2015/01/01 06:00 [pubmed] PHST- 2015/09/26 06:00 [medline] AID - S0306-9877(14)00456-3 [pii] AID - 10.1016/j.mehy.2014.12.012 [doi] PST - ppublish SO - Med Hypotheses. 2015 Feb;84(2):91-3. doi: 10.1016/j.mehy.2014.12.012. Epub 2014 Dec 20.