Morphine modulation of pain processing in medial and lateral pain pathways

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	Morphine modulation of pain processing in medial and lateral pain pathways
	Wang, Jin-Yan1 ; Huang, Jin 2; Chang, Jing-Yu 3; Woodward, Donald J.3; Luo, Fei1 ; Fei Luo
刊名	MOLECULAR PAIN
	2009-10-13
卷号	5
ISSN号	1744-8069
文献子类	Article
英文摘要	Background: Despite the wide-spread use of morphine and related opioid agonists in clinic and their powerful analgesic effects, our understanding of the neural mechanisms underlying opioid analgesia at supraspinal levels is quite limited. The present study was designed to investigate the modulative effect of morphine on nociceptive processing in the medial and lateral pain pathways using a multiple single-unit recording technique. Pain evoked neuronal activities were simultaneously recorded from the primary somatosensory cortex (SI), ventral posterolateral thalamus (VPL), anterior cingulate cortex (ACC), and medial dorsal thalamus (MD) with eight-wire microelectrode arrays in awake rats. Results: The results showed that the noxious heat evoked responses of single neurons in all of the four areas were depressed after systemic injection of 5 mg/kg morphine. The depressive effects of morphine included (i) decreasing the neuronal response magnitude; (ii) reducing the fraction of responding neurons, and (iii) shortening the response duration. In addition, the capability of cortical and thalamic neural ensembles to discriminate noxious from innocuous stimuli was decreased by morphine within both pain pathways. Meanwhile, morphine suppressed the pain-evoked changes in the information flow from medial to lateral pathway and from cortex to thalamus. These effects were completely blocked by pre-treatment with the opiate receptor antagonist naloxone. Conclusion: These results suggest that morphine exerts analgesic effects through suppressing both sensory and affective dimensions of pain.; Background: Despite the wide-spread use of morphine and related opioid agonists in clinic and their powerful analgesic effects, our understanding of the neural mechanisms underlying opioid analgesia at supraspinal levels is quite limited. The present study was designed to investigate the modulative effect of morphine on nociceptive processing in the medial and lateral pain pathways using a multiple single-unit recording technique. Pain evoked neuronal activities were simultaneously recorded from the primary somatosensory cortex (SI), ventral posterolateral thalamus (VPL), anterior cingulate cortex (ACC), and medial dorsal thalamus (MD) with eight-wire microelectrode arrays in awake rats.
学科主题	认知神经科学 ; 医学心理学
语种	英语
WOS记录号	WOS:000271609900001
公开日期	2011-08-22
内容类型	期刊论文
源URL	[http://ir.psych.ac.cn/handle/311026/5556]
专题	心理研究所_中国科学院心理研究所回溯数据库(1956-2010)
通讯作者	Fei Luo
作者单位	1.Chinese Acad Sci, Inst Psychol, Key Lab Mental Hlth, Beijing 100101, Peoples R China 2.Peking Univ, Neurosci Res Inst, Beijing 100871, Peoples R China 3.Neurosci Res Inst N Carolina, Winston Salem, NC USA
推荐引用方式 GB/T 7714	Wang, Jin-Yan,Huang, Jin,Chang, Jing-Yu,et al. Morphine modulation of pain processing in medial and lateral pain pathways[J]. MOLECULAR PAIN,2009,5.
APA	Wang, Jin-Yan,Huang, Jin,Chang, Jing-Yu,Woodward, Donald J.,Luo, Fei,&Fei Luo.(2009).Morphine modulation of pain processing in medial and lateral pain pathways.MOLECULAR PAIN,5.
MLA	Wang, Jin-Yan,et al."Morphine modulation of pain processing in medial and lateral pain pathways".MOLECULAR PAIN 5(2009).