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Hou YY, Cai YQ, Pan ZZ. GluA1 in Central Amygdala Promotes Opioid Use and Reverses Inhibitory Effect of Pain. Neuroscience 2019; 426:141-153. [PMID: 31863796 DOI: 10.1016/j.neuroscience.2019.11.032] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2019] [Revised: 11/20/2019] [Accepted: 11/21/2019] [Indexed: 01/22/2023]
Abstract
Increasing evidence suggests that long-term opioids and pain induce similar adaptive changes in the brain's reward circuits, however, how pain alters the addictive properties of opioids remains poorly understood. In this study using a rat model of morphine self-administration (MSA), we found that short-term pain, induced by an intraplantar injection of complete Freund's adjuvant (CFA), acutely decreased voluntary morphine intake, but not food intake, only at a morphine dose that did not affect pain itself. Pre-treatment with indomethacin, a non-opioid inhibitor of pain, before the pain induction blocked the decrease in morphine intake. In rats with steady MSA, the protein level of GluA1 subunits of glutamate AMPA receptors (AMPARs) was significantly increased, but that of GluA2 was decreased, resulting in an increased GluA1/GluA2 ratio in central nucleus of the amygdala (CeA). In contrast, pain decreased the GluA1/GluA2 ratio in the CeA of rats with MSA. Microinjection of NASPM, a selective inhibitor of homomeric GluA1-AMPARs, into CeA inhibited morphine intake. Furthermore, viral overexpression of GluA1 protein in CeA maintained morphine intake at a higher level than controls and reversed the pain-induced reduction in morphine intake. These findings suggest that CeA GluA1 promotes opioid use and its upregulation is sufficient to increase opioid consumption, which counteracts the acute inhibitory effect of pain on opioid intake. These results demonstrate that the CeA GluA1 is a shared target of opioid and pain in regulation of opioid use, which may aid in future development of therapeutic applications in opioid abuse.
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Affiliation(s)
- Yuan-Yuan Hou
- Department of Anesthesiology and Pain Medicine, The University of Texas MD Anderson Cancer Center, 1515 Holcombe Boulevard, Houston, TX 77030, USA
| | - You-Qing Cai
- Department of Anesthesiology and Pain Medicine, The University of Texas MD Anderson Cancer Center, 1515 Holcombe Boulevard, Houston, TX 77030, USA
| | - Zhizhong Z Pan
- Department of Anesthesiology and Pain Medicine, The University of Texas MD Anderson Cancer Center, 1515 Holcombe Boulevard, Houston, TX 77030, USA.
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Zhang RX, Zhang M, Li A, Pan L, Berman BM, Ren K, Lao L. DAMGO in the central amygdala alleviates the affective dimension of pain in a rat model of inflammatory hyperalgesia. Neuroscience 2013; 252:359-66. [PMID: 23994597 DOI: 10.1016/j.neuroscience.2013.08.030] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2013] [Accepted: 08/19/2013] [Indexed: 10/26/2022]
Abstract
Pain has sensory-discriminative and emotional-affective dimensions. Recent studies show that the affective component can be assessed with a conditioned place avoidance (CPA) test. We hypothesized that systemic morphine before a post-conditioning test would more potently attenuate the affective aspect compared to the sensory component and that [d-Ala2-N-Me-Phe4, Gly-ol5]-enkephalin (DAMGO), a μ-selective opioid receptor agonist, injected into the central nucleus of the amygdala (CeA) would reduce established CPA. A rat model of inflammatory pain, produced by a complete Freund adjuvant (CFA) injection into the hind paw, was combined with a CPA test. Three experiments were performed on adult male Sprague-Dawley rats. Systemic morphine (0.5 or 1.0mg/kg) in Experiment 1, intrathecal (i.t.) morphine (2.5 μg/rat) in Experiment 2, and intra-CeA DAMGO (7.7-15.4 ng/0.4 μl) in Experiment 3 were given to CFA-injected rats (n=6-8/group) prior to a post-conditioning test. Saline-injected rats were used as control. Time spent in a pain-paired compartment was recorded twice, before conditioning and after a post-conditioning test. Paw withdrawal latency (PWL) to a noxious thermal stimulus was measured before experiment at day-1 and after the post-conditioning test; hyperalgesia was defined as a decrease in PWL. The data showed that CFA-injected rats had significantly negative CPA compared to those of saline-injected rats (P<0.05). Low-dosage systemic morphine significantly (P<0.05) reduced CFA-induced CPA but had no effect on PWL. I.t. morphine did not inhibit the display of CPA but significantly increased PWL, suppressing hyperalgesia (P<0.05). Intra-CeA DAMGO significantly inhibited the display of CPA compared to saline (P<0.05) but had no effect on PWL. The data demonstrate that morphine attenuates the affective component more powerfully than it does the sensory and suggests that the sensory and the emotional-affective dimensions are underpinned by different mechanisms.
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Affiliation(s)
- R-X Zhang
- Center for Integrative Medicine, School of Medicine, University of Maryland, Baltimore, MD 21201, USA.
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Abstract
In addition to its neurotrophic role, brain-derived neurotrophic factor (BDNF) is involved in a wide array of functions, including anxiety and pain. The central amygdaloid nucleus (CeA) contains a high concentration of BDNF in terminals, originating from the pontine parabrachial nucleus. Since the spino-parabrachio-amygdaloid neural pathway is known to convey nociceptive information, we hypothesized a possible involvement of BDNF in supraspinal pain-related processes. To test this hypothesis, we generated localized deletion of BDNF in the parabrachial nucleus using local bilateral injections of adeno-associated viruses in adult floxed-BDNF mice. Basal thresholds of thermal and mechanical nociceptive responses were not altered by BDNF loss and no behavioural deficit was noticed in anxiety and motor tests. However, BDNF-deleted animals displayed a major decrease in the analgesic effect of morphine. In addition, intra-CeA injections of the BDNF scavenger TrkB-Fc in control mice also decreased morphine-induced analgesia. Finally, the number of c-Fos immunoreactive nuclei after acute morphine injection was decreased by 45% in the extended amygdala of BDNF-deleted animals. The absence of BDNF in the parabrachial nucleus thus altered the parabrachio-amygdaloid pathway. Overall, our study provides evidence that BDNF produced in the parabrachial nucleus modulates the functions of the parabrachio-amygdaloid pathway in opiate analgesia.
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Simons LE, Moulton EA, Linnman C, Carpino E, Becerra L, Borsook D. The human amygdala and pain: evidence from neuroimaging. Hum Brain Mapp 2012; 35:527-38. [PMID: 23097300 DOI: 10.1002/hbm.22199] [Citation(s) in RCA: 171] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2012] [Revised: 07/19/2012] [Accepted: 08/21/2012] [Indexed: 11/06/2022] Open
Abstract
The amygdala, a small deep brain structure involved in behavioral processing through interactions with other brain regions, has garnered increased attention in recent years in relation to pain processing. As pain is a multidimensional experience that encompasses physical sensation, affect, and cognition, the amygdala is well suited to play a part in this process. Multiple neuroimaging studies of pain in humans have reported activation in the amygdala. Here, we summarize these studies by performing a coordinate-based meta-analysis within experimentally induced and clinical pain studies using an activation likelihood estimate analysis. The results are presented in relation to locations of peak activation within and outside of amygdala subregions. The majority of studies identified coordinates consistent with human amygdala cytoarchitecture indicating reproducibility in neuroanatomical labeling across labs, analysis methods, and imaging modalities. Differences were noted between healthy and clinical pain studies: in clinical pain studies, peak activation was located in the laterobasal region, suggestive of the cognitive-affective overlay present among individuals suffering from chronic pain; while the less understood superficial region of the amygdala was prominent among experimental pain studies. Taken together, these findings suggest several important directions for further research exploring the amygdala's role in pain processing.
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Affiliation(s)
- Laura E Simons
- P.A.I.N. Group, Boston Children's Hospital, Center for Pain and the Brain, Harvard Medical School, Boston, Massachusetts; Division of Pain Medicine, Department of Anesthesiology, Perioperative and Pain Medicine, Boston Children's Hospital, Boston, Massachusetts; Department of Psychiatry, Harvard Medical School, Boston, Massachusetts
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5
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Carrasquillo Y, Gereau RW. Activation of the extracellular signal-regulated kinase in the amygdala modulates pain perception. J Neurosci 2007; 27:1543-51. [PMID: 17301163 PMCID: PMC6673749 DOI: 10.1523/jneurosci.3536-06.2007] [Citation(s) in RCA: 178] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2006] [Revised: 01/06/2007] [Accepted: 01/09/2007] [Indexed: 12/17/2022] Open
Abstract
The amygdala has been proposed to serve as a neural center for the modulation of pain perception. Numerous anatomical and behavioral studies demonstrate that exogenous manipulations of the amygdala (i.e., lesions, drug infusions) modulate behavioral responses to acute noxious stimuli; however, little is known about the endogenous molecular changes in the amygdala that contribute to alterations in nociceptive processing during persistent noxious stimuli that resemble pathological pain conditions. In the present study, we demonstrate that endogenous molecular changes in the amygdala play a crucial role in modulating long-lasting peripheral hypersensitivity associated with persistent inflammation and we further identify the extracellular signal-regulated kinase (ERK) as a molecular substrate underlying this behavioral sensitization. Using the formalin test as a mouse model of persistent inflammatory pain, we show that activation of ERK in the amygdala is both necessary for and sufficient to induce long-lasting peripheral hypersensitivity to tactile stimulation. Thus, blockade of inflammation-induced ERK activation in the amygdala significantly reduced long-lasting peripheral hypersensitivity associated with persistent inflammation, and pharmacological activation of ERK in the amygdala induced peripheral hypersensitivity in the absence of inflammation. Importantly, blockade of ERK activation in the amygdala did not affect responses to acute noxious stimuli in the absence of inflammation, indicating that modulation of nociceptive responses by amygdala ERK activation is specific to the persistent inflammatory state. Altogether, our results demonstrate a functional role of the ERK signaling cascade in the amygdala in inflammation-induced peripheral hypersensitivity.
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Affiliation(s)
- Yarimar Carrasquillo
- Washington University Pain Center and Department of Anesthesiology, Washington University School of Medicine, St. Louis, Missouri 63110, and
- Department of Neuroscience, Baylor College of Medicine, Houston, Texas 77030
| | - Robert W. Gereau
- Washington University Pain Center and Department of Anesthesiology, Washington University School of Medicine, St. Louis, Missouri 63110, and
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Sarhan M, Freund-Mercier MJ, Veinante P. Branching patterns of parabrachial neurons projecting to the central extended amgydala: single axonal reconstructions. J Comp Neurol 2006; 491:418-42. [PMID: 16175547 DOI: 10.1002/cne.20697] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Electrophysiological evidence suggests that the spinoparabrachioamygdaloid pathway carries nociceptive information that may be important for the elaboration of physiological and emotional responses to noxious events. The pontine parabrachial nucleus (pPB) sends a massive projection to the central nucleus of the amygdala (CeA) and lateral bed nucleus of the stria terminalis (BSTL), both regions belonging to a broader macrostructure, the central extended amygdala (EAc). The aim of this study was to examine whether different EAc components are targeted by a same pPB neuron, by reconstructing single axonal branching patterns after anterograde labelling. Small deposits of biotinylated dextran amine in the region of the external lateral pPB result in dense and specific labelling in the whole EAc. Reconstructed axons innervate either the lateral or the capsular part of the CeA with perisomatic or bushy terminals, respectively. A subset of axons enters the stria terminalis rostrally to follow its trajectory caudally toward the CeA. Individual axons targeting the CeA usually send collaterals to other EAc components, especially those projecting to the lateral CeA, which often coinnervate the BSTL. By contrast, only few branches were found outside the EAc. These results suggest that the noxious information travelling from the pPB to the CeA may also be transmitted to other EAc components. This pPB-EAc pathway, which appears distinct from the parabrachiohypothalamic and parabrachiothalamic projections, would be the anatomical basis through which the EAc elaborates the autonomic, endocrine, and emotional components of pain.
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Affiliation(s)
- Maysa Sarhan
- Unité Mixte de Recherche 7519, Centre National de la Recherche Scientifique/Université Louis Pasteur, 67084 Strasbourg, France
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Wasner G, Deuschl G. Chapter 50 Pain in Parkinson's disease. HANDBOOK OF CLINICAL NEUROLOGY 2006; 81:747-760. [PMID: 18808872 DOI: 10.1016/s0072-9752(06)80054-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
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Ducrocq F, Vaiva G. [From the biology of trauma to secondary preventive pharmalogical measures for post-traumatic stress disorders]. Encephale 2005; 31:212-26. [PMID: 15959448 DOI: 10.1016/s0013-7006(05)82388-7] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Of all the psychological complications that an individual is likely to present with when confronted with an exceptional event, the Post-Traumatic Stress Disorder is characterized by being progressive, frequent, invalidating, strongly associated with comorbidity, and having the tendency to become chronic if it is not detected clinically. By definition, it is threatening and produces an intense fear reaction. The traumatic event is a situation of extreme stress, not only capable of altering the physical and psychological homeostasis of the individual, but is also recognized as determinant in the aetiopathology of complications. The intensity of this distress can be identified clinically and physiologically, and is currently considered as an important risk factor for the development of PTSD later on, together with other pre-, peri- and post-traumatic factors. In fact, the most studied field is the therapeutic approach, in particular drug treatment, of the fully-constituted disorder, although this actually represents tertiary prevention. Even though primary prevention seems to concern Medicine very little, any prospect of performing secondary prevention should begin by rapid identification of the risk or vulnerability factors and should allow a population at risk from developing complications to be defined. Its potential therapeutic impact brings together psychotherapeutic and drug treatment, since it is only this combination that seems able to allow the most favourable clinical outcome to be achieved for an individual, who is confronted by an out-of-the-ordinary event. The aims of secondary prevention strategies are, for example, to reduce the incidence of acute PTSD in patients seen following the event. The benefits for the individual and for the society can easily be measured in terms of the consequences on his/her social, professional and family life, or in terms of cost. The usefulness of this prevention can also be measured by the possible ways that other conditions, comorbid to PTSD, are controlled, such as anxiety disorders, depression and substance abuse, for example. Secondary prevention strategies may also be aimed at determining the therapeutic impact, by preventing or moderating the appearance of an acute stress, or even by contributing in avoiding the onset of chronic PTSD. Psychopharmacology of the immediate and post-immediate disorders, however, remains a field which has been studied very little. Reduction or control of the high, prolonged level of hyperarousal phenomena or hypersensitization of the hypothalamo-pituitary axis, would contribute to the comfort of the individual, and would participate in the prevention of PTSD. Based on current knowledge of the neurobiology of trauma, we look into the existing and potential pharmacological possibilities. Even though benzodiazepines tend to have an important role, knowledge of other drugs and therapeutic groups is rapidly increasing. In this review, we will see that the efficacy of anti-adrenergic drugs and certain other anxiolytics is now well-documented, this opening the door to their use in the future. Other drug groups offer interesting, well-proven approaches, such as serotoninergic drugs, CRF or NPY antagonists, NMDA antagonists, anticonvulsants or other GABAergic agents. In view of this disorder, which represents a true public health problem, we consider that it is now possible to widen the horizons of our drug therapy, in combination with any necessary psychotherapeutic treatment, to reach the heart of the traumatic event, that often upsets the victims, both by the psychological suffering it induces, and the loss of his/her social, family and professional references and support structures.
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Affiliation(s)
- F Ducrocq
- Psychiatre, praticien hospitalier, Cellule d'Urgence Médico-Psychologique, SAMU Régional de Lille, Clinique Universitaire de Psychiatrie, CHRU de Lille, 59037 Lille cedex
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Finnegan TF, Chen SR, Pan HL. Effect of the μ Opioid on Excitatory and Inhibitory Synaptic Inputs to Periaqueductal Gray-Projecting Neurons in the Amygdala. J Pharmacol Exp Ther 2004; 312:441-8. [PMID: 15388784 DOI: 10.1124/jpet.104.074633] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Opioids are potent analgesics, but the sites of their action and cellular mechanisms are not fully understood. The central nucleus of the amygdala (CeA) is important for opioid analgesia through the projection to the periaquaductal gray (PAG). In this study, we examined the effects of mu opioid receptor stimulation on inhibitory and excitatory synaptic inputs to PAG-projecting CeA neurons retrogradely labeled with a fluorescent tracer injected into the ventrolateral PAG of rats. Whole-cell voltage-clamp recordings were performed on labeled CeA neurons in brain slices. The specific mu opioid receptor agonist, [d-Ala(2),N-Me-Phe(4),Gly(5)-ol]-enkephalin (DAMGO, 1 microM), significantly reduced the frequency of miniature inhibitory postsynaptic currents (mIPSCs) without altering the amplitude and decay constant of mIPSCs in 47.6% (10 of 21) of cells tested. DAMGO also significantly decreased the peak amplitude of evoked IPSCs in 69% (9 of 13) of cells examined. However, DAMGO did not significantly alter the frequency of miniature excitatory postsynaptic currents (EPSCs) and the amplitude of evoked EPSCs in 69% (9 of 13) and 83% (10 of 12) of labeled cells, respectively. The IPSCs were blocked by the GABA(A) receptor antagonist bicuculline, whereas the EPSCs were largely abolished by the non-N-methyl-d-aspartate antagonist 6-cyano-7-nitroquinoxaline-2,3-dione. The immunoreactivity of mu opioid receptors was colocalized with synaptophysin, a presynaptic marker, in close appositions to labeled CeA neurons. These results suggest that activation of mu opioid receptors on presynaptic terminals primarily attenuates GABAergic synaptic inputs to PAG-projecting neurons in the CeA.
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Affiliation(s)
- Thomas F Finnegan
- Department of Anesthesiology, H187, Pennsylvania State University College of Medicine, 500 University Drive, Hershey, PA 17033, USA
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10
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Abstract
This article focuses on possible psychopharmacological interventions in the immediate post disaster setting. As there is little evidence for the efficacy or effectiveness of such interventions-given the difficulty in performing randomized, double-blind, placebo controlled studies with these populations-the article will delineate the neurobiological basis for pathological sequelae and theoretical drug interventions targeting putative disease mechanisms.
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Affiliation(s)
- Asher Simon
- Department of Psychiatry, Mount Sinai School of Medicine, One Gustave L. Levy Place, Box 1230, New York, NY 10029, USA
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11
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Abstract
In the acute aftermath of exposure to extreme stress, nearly all trauma survivors experience one or more transient symptoms of stress. In the short run, these symptoms may serve an adaptive role and generally remit; in some cases, however, acute stress-related symptoms do not diminish and instead evolve into posttraumatic stress disorder (PTSD). At present it is not clear when and with whom to intervene. On one hand, it is possible that some responses, such as early intrusive memories, effectively recruit support from others and facilitate the psychological processing of trauma; on the other hand, failing to intervene clinically with a recently traumatized individual may permit the subsequent development of PTSD. In this review, we focus on potential pharmacologic interventions aimed at treating early symptoms of extreme arousal or dissociation with the hope of possibly preventing PTSD. To date there is almost no empirical data on effective pharmacologic interventions in the immediate aftermath of extreme psychological trauma. As a result, much of what is discussed in this review is speculative in nature
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Affiliation(s)
- Charles A Morgan
- Clinical Neurosciences Division, VA National Center for PTSD, West Haven, Connecticut, USA
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Arreto CD, Robert C, Limoge A, Gaudy JF. Use of the jaw opening reflex for assessing the effects of local anaesthetics in freely moving rats. J Pharmacol Toxicol Methods 2002; 48:45-51. [PMID: 12750041 DOI: 10.1016/s1056-8719(03)00020-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
INTRODUCTION In order to characterize a nonbehavioral model for assessing local anaesthetic (LA) activity, the effects of different LA agents (articaine, bupivacaine, procaine, and tetracaine) were measured in the conscious rat using the jaw-opening reflex (JOR). METHODS One hundred sixty rats were chronically implanted with stimulating electrodes in the dental pulp of the low incisor. While animals were conscious and unrestrained, the JOR threshold was measured electrophysiologically via electrodes wrapped around the digastric muscle. Each LA was administered in the infratemporal area. The increase of the JOR threshold was assessed during a 3-h period following injection. RESULTS Statistical analysis of the data showed a dose-dependent response to the four drugs tested. When the highest dose of each drug (articaine and procaine: 24 mg kg(-1), bupivacaine: 6 mg kg(-1), tetracaine: 3 mg kg(-1)) was administered (i) an immediate effect was observed for tetracaine and bupivacaine, whereas a 5-min delay was needed for articaine and procaine to act on the JOR threshold and (ii) an increase (>60%) of the JOR threshold was observed. The effects lasted 90 min for articaine, 45 min for procaine and bupivacaine, and 15 min for tetracaine before a return to baseline values. DISCUSSION The rat JOR response combined with infratemporal injection of test drugs can be used for the pharmacological evaluation of LAs.
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Affiliation(s)
- C-D Arreto
- Laboratoire d'Anatomie fonctionnelle de l'appareil manducateur, Université René Descartes-Paris 5, 1, rue Maurice Arnoux, 92 120, Montrouge, France.
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Saxe G, Stoddard F, Courtney D, Cunningham K, Chawla N, Sheridan R, King D, King L. Relationship between acute morphine and the course of PTSD in children with burns. J Am Acad Child Adolesc Psychiatry 2001; 40:915-21. [PMID: 11501691 DOI: 10.1097/00004583-200108000-00013] [Citation(s) in RCA: 219] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
OBJECTIVE To investigate the relationship between the dose of morphine administered during a child's hospitalization for an acute burn and the course of posttraumatic stress disorder (PTSD) symptoms over the 6-month period following discharge from the hospital. METHOD Twenty-four children admitted to the hospital for an acute burn were assessed twice with the Child PTSD Reaction Index: while in the hospital and 6 months after discharge. The Colored Analogue Pain Scale was also administered during the hospitalization. All patients received morphine while in the hospital. The mean dose of morphine (mg/kg/day) was calculated for each subject through chart review. RESULTS The Pearson product moment correlation revealed a significant association between the dose of morphine received while in the hospital and a 6-month reduction in PTSD symptoms. Children receiving higher doses of morphine had a greater reduction in PTSD symptoms over 6 months. CONCLUSIONS This study suggests the possibility that acute treatment with morphine can secondarily prevent PTSD. This result is discussed in terms of the possible effect of morphine on fear conditioning and the consolidation of traumatic memory.
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Affiliation(s)
- G Saxe
- Department of Child and Adolescent Psychiatry, Boston Medical Center Boston University School of Medicine, MA 02118, USA
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15
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Bourgeais L, Gauriau C, Bernard JF. Projections from the nociceptive area of the central nucleus of the amygdala to the forebrain: a PHA-L study in the rat. Eur J Neurosci 2001; 14:229-55. [PMID: 11553276 DOI: 10.1046/j.0953-816x.2001.01640.x] [Citation(s) in RCA: 123] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The lateral capsular division (CeLC) of the central nucleus (Ce) of the amygdala, in the rat, has been shown to be the main terminal area of a spino(trigemino)-parabrachio-amygdaloid nociceptive pathway [Bernard & Besson (1990) J. Neurophysiol. 63, 473-490; Bernard et al. (1992) J. Neurophysiol. 68, 551-569; Bernard et al. (1993) J. Comp. Neurol. 329, 201-229]. The projections to the forebrain from the CeLC and adjacent regions were studied in the rat by using microinjections of Phaseolus vulgaris leucoagglutinin (PHA-L) restricted in subdivisions of the Ce and the basolateral amygdaloid nucleus anterior (BLA). Our data showed that the entire CeLC projects primarily and extensively to the substantia innominata dorsalis (SId). The terminal labelling is especially dense in the caudal aspect of the SId. The other projections of the CeLC in the forebrain were dramatically less dense. They terminate in the bed nucleus of the stria terminalis (BST) and the posterior hypothalamus (pLH). No (or only scarce) other projections were found in the remaining forebrain areas. The Ce lateral division (CeL) and the Ce medial division (CeM), adjacent to the CeLC, also project to the SId with slightly lower density labelling. However, contrary to the case of the CeLC, both the CeL and the CeM extensively project to the ventrolateral subnucleus of the BST (BSTvl) with a few additional terminals found in other regions of the lateral BST. Only the CeM projects densely to both the interstitial nucleus of the posterior limb of the anterior commissure and the caudal most portion of the pLH. The projections of the BLA are totally different from those of the Ce as they terminate in the dorsal striatum, the accumbens nucleus, the olfactory tubercle, the nucleus of olfactory tract and the rostral pole of the cingulate/frontal cortex. This study demonstrates that the major output of the nociceptive spino(trigemino)-parabrachio-CeLC pathway is to the SId. It is suggested that the CeLC-SId pathway could have an important role in anxiety, aversion and genesis of fear in response to noxious stimuli.
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Affiliation(s)
- L Bourgeais
- Unité de Recherches de Physiopharmacologie du Système Nerveux, INSERM U-161, F-75014 Paris, France
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Magnusson JE, Fisher K. The involvement of dopamine in nociception: the role of D(1) and D(2) receptors in the dorsolateral striatum. Brain Res 2000; 855:260-6. [PMID: 10677598 DOI: 10.1016/s0006-8993(99)02396-3] [Citation(s) in RCA: 164] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Determination of the neuroanatomical and neurochemical factors that contribute to nociception is an essential element in the study and treatment of pain. Several lines of evidence have implicated nuclei and neurotransmitters within the basal ganglia in nociception. For example, previous studies have shown that dopamine receptors in the striatum are involved in acute nociception, however, it remains to be determined if dopamine receptors in the dorsolateral striatum are involved in persistent nociception. The purpose of the present study was therefore to determine whether activation or antagonism of dopamine receptors in the dorsolateral striatum influences the nociceptive responses of rats in the formalin test, a model of persistent pain. It was found that micro-injection of the non-selective dopamine antagonist haloperidol into the dorsolateral striatum increases formalin-induced nociception whereas injection of the non-selective dopamine agonist apomorphine reduces formalin-induced nociception. Injection of the D(1) antagonist SCH23390 or the D(1) agonist SKF38393 does not affect formalin-induced nociception. In contrast, injection of the D(2) antagonist eticlopride enhances formalin-induced nociception, whereas injection of the D(2) agonist quinpirole reduces formalin-induced nociception. These results provide additional evidence that dopamine receptors in the striatum are involved in nociception. Furthermore, this study strongly suggests that D(2), but not D(1), dopamine receptors in the dorsolateral striatum are involved in modulation of persistent nociception.
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MESH Headings
- 2,3,4,5-Tetrahydro-7,8-dihydroxy-1-phenyl-1H-3-benzazepine/administration & dosage
- 2,3,4,5-Tetrahydro-7,8-dihydroxy-1-phenyl-1H-3-benzazepine/pharmacology
- Animals
- Corpus Striatum/drug effects
- Corpus Striatum/physiology
- Dopamine/physiology
- Dopamine Agonists/administration & dosage
- Dopamine Agonists/pharmacology
- Dopamine Antagonists/administration & dosage
- Dopamine Antagonists/pharmacology
- Formaldehyde
- Haloperidol/administration & dosage
- Haloperidol/pharmacology
- Male
- Microinjections
- Motor Activity/drug effects
- Pain/physiopathology
- Rats
- Rats, Long-Evans
- Receptors, Dopamine D1/physiology
- Receptors, Dopamine D2/physiology
- Time Factors
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Affiliation(s)
- J E Magnusson
- Department of Clinical Neurosciences, Foothills Medical Centre, 12th Floor, 1403-29th Street N.W., Calgary, Alberta, Canada
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Chamberlin NL, Mansour A, Watson SJ, Saper CB. Localization of mu-opioid receptors on amygdaloid projection neurons in the parabrachial nucleus of the rat. Brain Res 1999; 827:198-204. [PMID: 10320709 DOI: 10.1016/s0006-8993(99)01168-3] [Citation(s) in RCA: 56] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
Abstract
The parabrachial nucleus (PB) is a major relay of noxious and non-noxious visceral sensory information from the nucleus of the solitary tract, spinal cord, and spinal trigeminal nucleus to the forebrain. The nucleus of the solitary tract, spinal cord, and trigeminal dorsal horns contain many enkephalin- and dynorphin-immunoreactive neurons that project to the PB. To study the role of mu-opioid receptors in relaying these inputs, we examined the distribution of mu-opioid receptor immunoreactivity in the PB. The most intense staining was in the external lateral parabrachial subnucleus (PBel), including dendrites extending from the PBel into the lateral crescent subnucleus. Because the Pbel is a major source of projections to the amygdala, we combined retrograde tracing from the central nucleus of the amygdala with immunohistochemistry for mu-opioid receptors. These experiments showed that mu-opioid receptors are expressed by Pbel neurons that project to the amygdala, including those Pbel neurons whose dendrites extend into the lateral crescent subnucleus. These results indicate that mu-opioid receptors in the PB may mediate or modulate nociceptive information relayed to the amygdala from medullary or spinal cord neurons that terminate not only in the Pbel, but also in the adjacent lateral crescent parabrachial subnucleus.
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Affiliation(s)
- N L Chamberlin
- Department of Neurology, Harvard Medical School, Beth Israel Deaconess Medical Center, 77 Avenue Louis Pasteur, Boston, MA 02215, USA.
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Bester H, Matsumoto N, Besson JM, Bernard JF. Further evidence for the involvement of the spinoparabrachial pathway in nociceptive processes: A c-Fos study in the rat. J Comp Neurol 1997. [DOI: 10.1002/(sici)1096-9861(19970714)383:4<439::aid-cne4>3.0.co;2-3] [Citation(s) in RCA: 76] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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Bernard JF, Bester H, Besson JM. Involvement of the spino-parabrachio -amygdaloid and -hypothalamic pathways in the autonomic and affective emotional aspects of pain. PROGRESS IN BRAIN RESEARCH 1996; 107:243-55. [PMID: 8782523 DOI: 10.1016/s0079-6123(08)61868-3] [Citation(s) in RCA: 184] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- J F Bernard
- Unité de Recherches Physiopharmacologie du Système Nerveux, INSERM U 161 and EPHE, Paris, France
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Feil K, Herbert H. Topographic organization of spinal and trigeminal somatosensory pathways to the rat parabrachial and Kölliker-Fuse nuclei. J Comp Neurol 1995; 353:506-28. [PMID: 7759613 DOI: 10.1002/cne.903530404] [Citation(s) in RCA: 221] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
We examined the organization of somatosensory projections to the parabrachial (PB) and Kölliker-Fuse (KF) nuclei by employing the retrograde and anterograde axonal transport of Fluorogold and Phaseolus vulgaris-leucoagglutinin (PHA-L), respectively. Small PHA-L injections were made into different parts of the spinal trigeminal complex, including the paratrigeminal nucleus, and into different segments and laminae of the spinal dorsal horn. The subnuclear distribution of axonal labeling in the PB and KF was mapped with a camera lucida. Our results show that the somatosensory input to the PB and KF is highly organized. Neurons in the spinal trigeminal nuclei project predominantly to the KF and to the ventral portion of the external lateral PB. Neurons in the paratrigeminal nucleus project to the ventral lateral PB, the external medial PB, and to caudal aspects of the medial PB. These findings were supported by retrograde tracing experiments with Fluorogold. Spinal cord neurons located in the superficial dorsal horn (laminae I-II) of upper cervical segments project specifically to the ventral portion of the external lateral PB and, although more sparsely, to various other lateral PB nuclei. In contrast, neurons in the superficial dorsal horn of thoracic and lumbar spinal segments project mainly to the dorsal lateral and the central lateral PB. Finally, neurons in the lateral reticulated area and the lateral spinal nucleus of all spinal segments project almost exclusively to the internal lateral PB, whereas neurons in the respective nuclei of upper cervical segments also project to the KF. From our data we conclude that the somatosensory projections to the PB and KF are topographically organized. It is assumed that these pathways, which run from trigeminal and spinal neurons through the PB and KF to various forebrain, medullary, and spinal nuclei, form functionally different neural circuits that are involved in somatoautonomic processing.
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Affiliation(s)
- K Feil
- Department of Animal Physiology, University of Tübingen, Germany
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Bernard JF, Dallel R, Raboisson P, Villanueva L, Le Bars D. Organization of the efferent projections from the spinal cervical enlargement to the parabrachial area and periaqueductal gray: a PHA-L study in the rat. J Comp Neurol 1995; 353:480-505. [PMID: 7759612 DOI: 10.1002/cne.903530403] [Citation(s) in RCA: 146] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
The organization of efferent projections from the spinal cervical enlargement to the parabrachial (PB) area and the periaqueductal gray (PAG) was studied in the rat by using microinjections of Phaseolus vulgaris-leucoagglutinin (PHA-L) into different laminae around the C7 level. The results demonstrated two areas of cervical enlargement which project in different ways to the PB area and PAG. First, the superficial laminae (I, II) showed a very dense projection, with a clear contralateral dominance at the coronal level where the inferior colliculus merges with the pons, to a restricted "superficial" portion of the PB area, namely the lateral crescent area, the dorsal lateral, the superior lateral (PBsl), and the outer portion of the external lateral PB subnuclei. Less dense projections were observed in the Kölliker-Fuse nucleus (KF) and in the ventrolateral/lateral quadrant of the caudal and mid PAG. By contrast, the labeling was weak or absent in the other PB subnuclei and the outer adjacent regions; in particular, no, or very little, labeling was found in the cuneiform nucleus. The PB area appeared to be the supraspinal target that received the densest projection from laminae I and II. Projections were less dense in the PAG and the thalamus and markedly less in other sites such as the ventrolateral medulla, the subnucleus reticularis dorsalis, and the nucleus of the solitary tract. Second, the reticular portion of lamina V, the medial portion of laminae IV-VI up to X and lamina VIII, showed bilateral projections with a weak ipsilateral dominance and a high to medium density on a very restricted portion of the PB area, namely the internal lateral PB subnucleus. A lesser projection was also observed in the adjacent portion of the PBsl, the KF, and the lateral quadrant of the PAG. These results suggest that signals carried by neurons from lamina I-II converge on a restricted superficial portion of the PB area and the ventral part of the lateral quadrant of the PAG. These results are discussed in the context of the role of the spino-PB and spino-PAG pathways in nociception.
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Affiliation(s)
- J F Bernard
- Unité de Recherches de Physiopharmacologie du Système Nerveux, INSERM U 161, Paris, France
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Matthies BK, Franklin KB. Effects of partial decortication on opioid analgesia in the formalin test. Behav Brain Res 1995; 67:59-66. [PMID: 7748501 DOI: 10.1016/0166-4328(94)00104-n] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Partially decorticated rats were tested for their response to nociceptive stimulation in the formalin and tail flick tests, and for the effect of morphine on these responses and on motor activity. Undrugged rats showed vigorous responses to nociceptive stimulation in both tests, and exhibited the typical biphasic time course of pain in the formalin test. Morphine 4 and 8 mg/kg produced dose-dependent analgesia in both tests in sham operated rats, and in rats with lesions that removed all or part of the cortex from the midline to the rhinal fissure (excluding the occipital cortex). In rats with lesions that extended deep into the piriform cortex and damaged the amygdala morphine analgesia was eliminated or attenuated. These and other recent findings suggest that analgesia in the formalin test depends on ascending connections to the forebrain, probably the amygdala.
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Affiliation(s)
- B K Matthies
- Department of Psychology, McGill University, Montreal, Que., Canada
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Abstract
The involvement of the basal ganglia in motor functions has been well studied. Recent neurophysiological, clinical and behavioral experiments indicate that the basal ganglia also process non-noxious and noxious somatosensory information. However, the functional significance of somatosensory information processing within the basal ganglia is not well understood. This review explores the role of the striatum, globus pallidus and substantia nigra in nociceptive sensorimotor integration and suggests several roles of these basal ganglia structures in nociception and pain. Electrophysiological experiments have detailed the non-nociceptive and nociceptive response properties of basal ganglia neurons. Most studies agree that some neurons within the basal ganglia encode stimulus intensity. However, these neurons do not appear to encode stimulus location since the receptive fields of these cells are large. Many basal ganglia neurons responsive to somatosensory stimulation are activated exclusively or differentially by noxious stimulation. Indirect techniques used to measure neuronal activity (i.e., positron emission tomography and 2-deoxyglucose methods) also indicate that the basal ganglia are activated differentially by noxious stimulation. Neuroanatomical experiments suggest several pathways by which nociceptive information may reach the basal ganglia. Neuroanatomical studies have also indicated that the basal ganglia are rich in many different neuroactive chemicals that may be involved in the modulation of nociceptive information. Microinjection of opiates, dopamine and gamma-aminobutyric acid (GABA) into the basal ganglia have varied effects on pain behavior. Administration of these neurochemicals into the basal ganglia affects supraspinal pain behaviors more consistently than spinal reflexive behaviors. The reduction of pain behavior following electrical stimulation of the substantia nigra and caudate nucleus provides additional evidence for a role of the basal ganglia in pain modulation. Some patients with basal ganglia disease (e.g., Parkinson's disease, Huntington's disease) have alterations in pain sensation in addition to motor abnormalities. Frequently, these patients have intermittent pain that is difficult to localize. Collectively, these data suggest that the basal ganglia may be involved in the (1) sensory-discriminative dimension of pain, (2) affective dimension of pain, (3) cognitive dimension of pain, (4) modulation of nociceptive information and (5) sensory gating of nociceptive information to higher motor areas. Further experiments that correlate neuronal discharge activity with stimulus intensity and escape behavior in operantly conditioned animals are necessary to fully understand how the basal ganglia are involved in nociceptive sensorimotor integration.
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Affiliation(s)
- Eric H Chudler
- Department of Anesthesiology and Multidisciplinary Pain Center, University of Washington, Seattle, WA 98195, USA
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Alden M, Besson JM, Bernard JF. Organization of the efferent projections from the pontine parabrachial area to the bed nucleus of the stria terminalis and neighboring regions: a PHA-L study in the rat. J Comp Neurol 1994; 341:289-314. [PMID: 7515078 DOI: 10.1002/cne.903410302] [Citation(s) in RCA: 130] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
The organization of efferent projections from the pontine parabrachial (pPB) area to the forebrain rostral to the central nucleus of the amygdala (Ce) was studied in the rat by using microinjections of Phaseolus vulgaris leucoagglutinin (PHA-L), into subregions of the pPB area. The present study is a follow-up of a former study (Bernard et al. [1993] J. Comp. Neurol. 329:201-229) which examines pPB projections onto the Ce. The results demonstrate that: (1) the pPB(m) region (the medial, the ventral lateral subnuclei and the waist area) diffusely projects to the lateral division (BSTL) of the bed nucleus of the stria terminalis (BST), the Ce-BSTL continuum (including, the dorsal portion of substantia innominata, the ventral portion of globus pallidus, the fundus striatum, and the substriatal area) and to a lesser extent the agranular insular cortex; (2) the pPB(1) region [the central lateral (pPBcl) and the outer portion of external lateral subnuclei] densely projects to the dorsal lateral subnucleus of BST (BSTdl); only the pPBcl subnucleus projects to the median, the anteroventral and the periventricular nuclei of the preoptic hypothalamus; and (3) the remaining pPB area (the dorsal lateral, part of the external lateral and the external medial subnuclei) projects to the nucleus of horizontal limb of diagonal band but does not project onto the BST and the preoptic hypothalamus. It is suggested that the pPB(m)-BSTL "diffuse pathway" is mainly implicated in motivational and autonomic aspects of taste. The pPB(1)-BSTdl and hypothalamic "concentrated pathways" could be implicated in autonomic and nociceptive processes.
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Affiliation(s)
- M Alden
- Unité de Recherches de Physiopharmacologie du Système Nerveux and EPHE, INSERM U 161, Paris, France
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