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Zhang S, Zhang J, Yang Y, Zang W, Cao J. Activation of Pedunculopontine Tegmental Nucleus Alleviates the Pain Induced by the Lesion of Midbrain Dopaminergic Neurons. Int J Mol Sci 2024; 25:5636. [PMID: 38891832 PMCID: PMC11171649 DOI: 10.3390/ijms25115636] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2024] [Revised: 05/17/2024] [Accepted: 05/20/2024] [Indexed: 06/21/2024] Open
Abstract
The loss of midbrain dopaminergic (DA) neurons is the fundamental pathological feature of Parkinson's disease (PD). PD causes chronic pain in two-thirds of patients. Recent studies showed that the activation of the pedunculopontine tegmental nucleus (PPTg) can effectively relieve inflammatory pain and neuropathic pain. The PPTg is located in the pontomesencephalic tegmentum, a target of deep brain stimulation (DBS) treatment in PD, and is involved in motor control and sensory integration. To test whether the lesion of midbrain DA neurons induced pain hypersensitivity, and whether the chemogenetic activation of the PPTg could modulate the pain, the AAV-hM3Dq receptor was transfected and expressed into the PPTg neurons of 6-hydroxydopamine-lesioned mice. In this study, von Frey, open field, and adhesive tape removal tests were used to assess animals' pain sensitivity, locomotor activity, and sensorimotor function and somatosensory perception, respectively. Here, we found that the lesion of midbrain DA neurons induced a minor deficit in voluntary movement but did not affect sensorimotor function and somatosensory perception in the tape removal test. The results showed that lesion led to pain hypersensitivity, which could be alleviated both by levodopa and by the chemogenetic activation of the PPTg. Activating the PPTg may be a potential therapeutic strategy to relieve pain phenotypes in PD.
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Affiliation(s)
- Shiqiang Zhang
- School of Basic Medical Sciences, Zhengzhou University, Zhengzhou 450001, China; (S.Z.); (J.Z.); (Y.Y.)
- Neuroscience Research Institute, Zhengzhou University, Zhengzhou 450001, China
| | - Jingjing Zhang
- School of Basic Medical Sciences, Zhengzhou University, Zhengzhou 450001, China; (S.Z.); (J.Z.); (Y.Y.)
- Neuroscience Research Institute, Zhengzhou University, Zhengzhou 450001, China
| | - Yihao Yang
- School of Basic Medical Sciences, Zhengzhou University, Zhengzhou 450001, China; (S.Z.); (J.Z.); (Y.Y.)
- Neuroscience Research Institute, Zhengzhou University, Zhengzhou 450001, China
| | - Weidong Zang
- School of Basic Medical Sciences, Zhengzhou University, Zhengzhou 450001, China; (S.Z.); (J.Z.); (Y.Y.)
- Neuroscience Research Institute, Zhengzhou University, Zhengzhou 450001, China
| | - Jing Cao
- School of Basic Medical Sciences, Zhengzhou University, Zhengzhou 450001, China; (S.Z.); (J.Z.); (Y.Y.)
- Neuroscience Research Institute, Zhengzhou University, Zhengzhou 450001, China
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Moreau C, El Habnouni C, Lecron JC, Morel F, Delwail A, Le Gall-Ianotto C, Le Garrec R, Misery L, Piver E, Vaillant L, Lefevre A, Emond P, Blasco H, Samimi M. Salivary metabolome indicates a shift in tyrosine metabolism in patients with burning mouth syndrome: a prospective case-control study. Pain 2023; 164:e144-e156. [PMID: 35916738 DOI: 10.1097/j.pain.0000000000002733] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2022] [Accepted: 05/31/2022] [Indexed: 11/25/2022]
Abstract
ABSTRACT The pathophysiology of primary burning mouth syndrome (BMS) remains controversial. Targeted analyses or "omics" approach of saliva provide diagnostic or pathophysiological biomarkers. This pilot study's primary objective was to explore the pathophysiology of BMS through a comparative analysis of the salivary metabolome among 26 BMS female cases and 25 age- and sex-matched control subjects. Secondary objectives included comparative analyses of inflammatory cytokines, neuroinflammatory markers, and steroid hormones among cases and control subjects, and among BMS patients according to their clinical characteristics. Salivary metabolome, neuroinflammatory markers, cytokines, and steroids were, respectively, analysed by liquid chromatography coupled with mass spectrometry, ELISA and protease activity assay, and multiparametric Luminex method. Among the 166 detected metabolites, univariate analysis did not find any discriminant metabolite between groups. Supervised multivariate analysis divided patients into 2 groups with an accuracy of 60% but did not allow significant discrimination (permutation test, P = 0.35). Among the metabolites contributing to the model, 3 belonging to the tyrosine pathway ( l -dopa, l -tyrosine, and tyramine) were involved in the discrimination between cases and control subjects, and among BMS patients according to their levels of pain. Among the detectable molecules, levels of cytokines, steroid hormones, and neuroinflammatory markers did not differ between cases and control subjects and were not associated with characteristics of BMS patients. These results do not support the involvement of steroid hormones, inflammatory cytokines, or inflammatory neurogenic mediators in the pathophysiology of pain in BMS, whereas the observed shift in tyrosine metabolism may indicate an adaptative response to chronic pain or an impaired dopaminergic transmission.
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Affiliation(s)
- Charlotte Moreau
- University François Rabelais, Tours, France
- Department of Dermatology, University Hospital of Tours, Tours Cedex, France
| | - Chakib El Habnouni
- University François Rabelais, Tours, France
- Department of Dermatology, University Hospital of Tours, Tours Cedex, France
| | - Jean-Claude Lecron
- Laboratory Inflammation, Tissus Epithéliaux et Cytokines, Poitiers University and Immunology/inflammation Laboratory, Poitiers University Hospital, Poitiers, France
| | - Franck Morel
- Laboratory Inflammation, Tissus Epithéliaux et Cytokines, Poitiers University and Immunology/inflammation Laboratory, Poitiers University Hospital, Poitiers, France
| | - Adriana Delwail
- ImageUP, Plate-forme d'Imagerie and Laboratoire Signalisation et Transport Ioniques Membranaires ERL CNRS 7003/EA 7349, Poitiers University, Poitiers, France
| | | | - Raphaele Le Garrec
- Univ Brest, LIEN (Laboratoire Interactions Epithelium Neurones), Brest, France
| | - Laurent Misery
- Univ Brest, LIEN (Laboratoire Interactions Epithelium Neurones), Brest, France
| | - Eric Piver
- Department of Biochemistry and Molecular Biology, University Hospital of Tours, Tours Cedex, France
- Inserm UMR 1259-Morphogenèse et antigénicité du VIH et des virus des hépatites (MAVIVH)
| | - Loïc Vaillant
- University François Rabelais, Tours, France
- Department of Dermatology, University Hospital of Tours, Tours Cedex, France
| | | | - Patrick Emond
- UMR 1253 iBrain, Université de Tours, Inserm, Tours, France
- Department of In Vitro Nuclear Medicine, University Hospital of Tours, Tours Cedex, France
| | - Hélène Blasco
- Department of Biochemistry and Molecular Biology, University Hospital of Tours, Tours Cedex, France
- UMR 1253 iBrain, Université de Tours, Inserm, Tours, France
| | - Mahtab Samimi
- University François Rabelais, Tours, France
- Department of Dermatology, University Hospital of Tours, Tours Cedex, France
- BIP, 1282 INRA University of Tours, Tours, France
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Babaie S, Taghvimi A, Hong JH, Hamishehkar H, An S, Kim KH. Recent advances in pain management based on nanoparticle technologies. J Nanobiotechnology 2022; 20:290. [PMID: 35717383 PMCID: PMC9206757 DOI: 10.1186/s12951-022-01473-y] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2022] [Accepted: 05/21/2022] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Pain is a vital sense that indicates the risk of injury at a particular body part. Successful control of pain is the principal aspect in medical treatment. In recent years, the advances of nanotechnology in pain management have been remarkable. In this review, we focus on literature and published data that reveal various applications of nanotechnology in acute and chronic pain management. METHODS The presented content is based on information collected through pain management publications (227 articles up to April 2021) provided by Web of Science, PubMed, Scopus and Google Scholar services. RESULTS A comprehensive study of the articles revealed that nanotechnology-based drug delivery has provided acceptable results in pain control, limiting the side effects and increasing the efficacy of analgesic drugs. Besides the ability of nanotechnology to deliver drugs, sophisticated nanosystems have been designed to enhance imaging and diagnostics, which help in rapid diagnosis of diseases and have a significant impact on controlling pain. Furthermore, with the development of various tools, nanotechnology can accurately measure pain and use these measurements to display the efficiency of different interventions. CONCLUSIONS Nanotechnology has started a new era in the pain management and many promising results have been achieved in this regard. Nevertheless, there is still no substantial and adequate act of nanotechnology in this field. Therefore, efforts should be directed to broad investigations.
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Affiliation(s)
- Soraya Babaie
- Physical Medicine and Rehabilitation Research Center and Student Research Committee, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Arezou Taghvimi
- Biotechnology Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Joo-Hyun Hong
- School of Pharmacy, Sungkyunkwan University (SKKU), Suwon, 16419, Republic of Korea
| | - Hamed Hamishehkar
- Drug Applied Research Center, Tabriz University of Medical Sciences, Tabriz, Iran.
| | - Seongpil An
- SKKU Advanced Institute of Nanotechnology (SAINT) and Department of Nano Engineering, Sungkyunkwan University (SKKU), Suwon, 16419, Republic of Korea.
| | - Ki Hyun Kim
- School of Pharmacy, Sungkyunkwan University (SKKU), Suwon, 16419, Republic of Korea.
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Martin SL, Jones AKP, Brown CA, Kobylecki C, Whitaker GA, El-Deredy W, Silverdale MA. Altered Pain Processing Associated with Administration of Dopamine Agonist and Antagonist in Healthy Volunteers. Brain Sci 2022; 12:brainsci12030351. [PMID: 35326306 PMCID: PMC8946836 DOI: 10.3390/brainsci12030351] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2022] [Revised: 02/22/2022] [Accepted: 02/23/2022] [Indexed: 12/10/2022] Open
Abstract
Striatal dopamine dysfunction is associated with the altered top-down modulation of pain processing. The dopamine D2-like receptor family is a potential substrate for such effects due to its primary expression in the striatum, but evidence for this is currently lacking. Here, we investigated the effect of pharmacologically manipulating striatal dopamine D2 receptor activity on the anticipation and perception of acute pain stimuli in humans. Participants received visual cues that induced either certain or uncertain anticipation of two pain intensity levels delivered via a CO2 laser. Rating of the pain intensity and unpleasantness was recorded. Brain activity was recorded with EEG and analysed via source localisation to investigate neural activity during the anticipation and receipt of pain. Participants completed the experiment under three conditions, control (Sodium Chloride), D2 receptor agonist (Cabergoline), and D2 receptor antagonist (Amisulpride), in a repeated-measures, triple-crossover, double-blind study. The antagonist reduced an individuals’ ability to distinguish between low and high pain following uncertain anticipation. The EEG source localisation showed that the agonist and antagonist reduced neural activations in specific brain regions associated with the sensory integration of salient stimuli during the anticipation and receipt of pain. During anticipation, the agonist reduced activity in the right mid-temporal region and the right angular gyrus, whilst the antagonist reduced activity within the right postcentral, right mid-temporal, and right inferior parietal regions. In comparison to control, the antagonist reduced activity within the insula during the receipt of pain, a key structure involved in the integration of the sensory and affective aspects of pain. Pain sensitivity and unpleasantness were not changed by D2R modulation. Our results support the notion that D2 receptor neurotransmission has a role in the top-down modulation of pain.
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Affiliation(s)
- Sarah L. Martin
- Department of Psychology, Manchester Metropolitan University, Manchester M15 6GX, UK
- The Human Pain Research Group, Division of Neuroscience and Experimental Psychology, The University of Manchester, Manchester M13 9PL, UK; (A.K.P.J.); (C.A.B.)
- Correspondence:
| | - Anthony K. P. Jones
- The Human Pain Research Group, Division of Neuroscience and Experimental Psychology, The University of Manchester, Manchester M13 9PL, UK; (A.K.P.J.); (C.A.B.)
| | - Christopher A. Brown
- The Human Pain Research Group, Division of Neuroscience and Experimental Psychology, The University of Manchester, Manchester M13 9PL, UK; (A.K.P.J.); (C.A.B.)
- Department of Psychological Sciences, University of Liverpool, Liverpool L69 3BX, UK
| | - Christopher Kobylecki
- Salford Royal NHS Foundation Trust, Department of Neurology, Manchester Academic Health Science Centre, Salford M6 8HD, UK; (C.K.); (M.A.S.)
| | - Grace A. Whitaker
- Advanced Center for Electrical and Electronics Engineering, Federico Santa María Technical University, Valparaíso 1680, Chile;
| | - Wael El-Deredy
- Centro de Investigación y Desarrollo en Ingeniería en Salud, Universidad de Valparaíso, Valparaiso 1680, Chile;
| | - Monty A. Silverdale
- Salford Royal NHS Foundation Trust, Department of Neurology, Manchester Academic Health Science Centre, Salford M6 8HD, UK; (C.K.); (M.A.S.)
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Research Progress on the Pharmacological Action of Schisantherin A. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE 2022; 2022:6420865. [PMID: 35190748 PMCID: PMC8858060 DOI: 10.1155/2022/6420865] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/16/2021] [Revised: 10/23/2021] [Accepted: 01/21/2022] [Indexed: 11/18/2022]
Abstract
Schisantherin A (Sch A) is a dibenzocyclooctadiene lignan monomer isolated from the fruit of Schisandra chinensis (Turcz.) Baill. (S. chinensis). At present, many studies have shown that Sch A has a wide range of pharmacological effects, including its anti-Parkinson and anti-inflammatory effects and ability to protect the liver, protect against ischemia-reperfusion (I/R) injury, suppress osteoclast formation, and improve learning and memory. Its mechanism may be related to the antioxidant, anti-inflammatory, and antiapoptotic properties of Sch A through the MAPK, NF-κB, AKT/GSK3β, and PI3K/AKT pathways. This is the first review of the recent studies on the pharmacological mechanism of Sch A.
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Case L, Adler-Neal AL, Wells RE, Zeidan F. The Role of Expectations and Endogenous Opioids in Mindfulness-Based Relief of Experimentally Induced Acute Pain. Psychosom Med 2021; 83:549-556. [PMID: 33480666 PMCID: PMC8415135 DOI: 10.1097/psy.0000000000000908] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
OBJECTIVE Expectations contribute to cognitive pain modulation through opioidergically mediated descending inhibition. Mindfulness meditation reduces pain independent of endogenous opioids, engaging unique corticothalamocortical mechanisms. However, it remains unknown whether expectations for pain relief predict mindfulness-induced analgesia and if these expectations are modified by endogenous opioids. METHODS In this secondary analysis of previously published work, 78 pain-free participants (mean age, 27 ± 7 years; 50% women) were randomized to a four-session mindfulness meditation or book listening regimen. Expectations for intervention-induced pain relief were assessed before and after each intervention. Pain ratings were examined after meditation or rest (control group) during noxious heat (49°C) and intravenous administration of saline placebo or the opioid antagonist naloxone (0.15 mg/kg bolus + 0.1 mg kg-1 h-1 infusion. RESULTS Mindfulness significantly lowered pain during saline and naloxone infusion. Higher expected pain relief from mindfulness predicted lower pain intensity (r(40) = -0.41, p = .009). The relationship between meditation-related expectations and pain intensity reductions was exhibited during naloxone (r(20) = -0.76, p < .001) but not saline (r(20) = -0.22, p = .36). Expectations for book listening-based analgesia did not significantly predict pain changes during saline (r(20) = -0.37, p = .11) or naloxone (r(18) = 0.26, p = .30) in the control group. CONCLUSIONS These novel findings demonstrate a significant role for expectations in mindfulness-based pain relief. However, this role was minimal during saline and stronger during opioid blockade, despite similar pain reductions. This supports growing evidence that mindfulness engages multiple mechanisms to reduce pain, suggesting that mindfulness might be an effective pain-reducing technique even for individuals with low expectations for pain relief.
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Affiliation(s)
- Laura Case
- Department of Anesthesiology, University of California at San Diego
| | | | | | - Fadel Zeidan
- Department of Anesthesiology, University of California at San Diego
- Department of Neurobiology and Anatomy, Wake Forest School of Medicine
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Fidanza F, Polimeni E, Pierangeli V, Martini M. A Better Touch: C-tactile Fibers Related Activity is Associated to Pain Reduction During Temporal Summation of Second Pain. THE JOURNAL OF PAIN 2021; 22:567-576. [PMID: 33465505 DOI: 10.1016/j.jpain.2021.01.001] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2020] [Revised: 12/14/2020] [Accepted: 01/03/2021] [Indexed: 02/07/2023]
Abstract
C-tactile (CT) fibers, responsible for the so-called "affective" touch (AT), have drawn a fair amount of attention within the scientific community for their marked social dimension. However, while the pain-relieving potential of discriminative touch (DT) has been documented, proofs of the analgesic properties of AT are still scarce. Additionally, no study has so far tested its possible pain-relieving effects on a clinically-relevant model. Temporal summation of second pain (TSSP), otherwise referred to as "wind-up," relies on repetitive stimulation of C-nociceptors and it is thought to reflect central sensitization, a process linked to many chronic pain conditions. In the present experimental, within participants, design we induced TSSP through trains of ascending and descending repetitive heat stimulation. Forty-two healthy participants' pain was measured during 2 different tactile stimulations (stroking velocities AT: 10 cm/s; DT: 0.3 cm/s) or without concomitant tactile input. Since measures of pleasantness of the tactile stimulation have been found to strongly correlate with C-tactile fibers' firing rate, these, together with participants' body awareness, were also taken into account. Our results show that AT brought about a decrease of our participants' pain as opposed to both DT and no touch, while DT did not produce any significant pain reduction. Thus, only AT successfully modulated wind-up. As expected, AT was perceived as more pleasant than DT, while a clear relationship between body awareness and pain was found only during DT. Targeting CT fibers could pave the way to new treatments for chronic pain conditions whose aetiology depend on abnormal C-nociceptors' physiology. PERSPECTIVE: This study extends previous findings on the analgesic potential of affective touch, documenting a clear pain reduction during temporal summation of second pain (TSSP). Since TSSP is thought to reflect central sensitization, the psychophysiological mechanisms of affective touch could be exploited for new chronic pain treatments.
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Affiliation(s)
| | - Elisa Polimeni
- Department of Psychology, University of East London, London, UK
| | | | - Matteo Martini
- Department of Psychology, University of East London, London, UK.
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Florin E, Koschmieder KC, Schnitzler A, Becker S. Recovery of Impaired Endogenous Pain Modulation by Dopaminergic Medication in Parkinson's Disease. Mov Disord 2020; 35:2338-2343. [DOI: 10.1002/mds.28241] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2020] [Accepted: 07/21/2020] [Indexed: 11/08/2022] Open
Affiliation(s)
- Esther Florin
- Institute of Clinical Neuroscience and Medical Psychology, Medical Faculty Heinrich‐Heine University Düsseldorf Düsseldorf Germany
| | - Kim C. Koschmieder
- Institute of Clinical Neuroscience and Medical Psychology, Medical Faculty Heinrich‐Heine University Düsseldorf Düsseldorf Germany
| | - Alfons Schnitzler
- Institute of Clinical Neuroscience and Medical Psychology, Medical Faculty Heinrich‐Heine University Düsseldorf Düsseldorf Germany
| | - Susanne Becker
- Integrative Spinal Research, Department of Chiropractic Medicine Balgrist University Hospital, University of Zurich Zurich Switzerland
- Department of Cognitive and Clinical Neuroscience, Central Institute of Mental Health, Medical Faculty Mannheim Heidelberg University Mannheim Germany
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Taherianfard M, Aalami S. Effects of Pretreatment With Ginseng Extract on Dopamine D2 Receptor Analgesia. Basic Clin Neurosci 2020; 11:587-593. [PMID: 33643552 PMCID: PMC7878063 DOI: 10.32598/bcn.9.10.425] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2019] [Revised: 08/10/2019] [Accepted: 12/19/2019] [Indexed: 11/29/2022] Open
Abstract
Introduction: The ginseng extract is an herb that has been used for many purposes such as analgesic effect. Dopamine D2 receptors are involved in the regulation of pain in humans. Therefore, the present investigation aims to study how pretreatment with aqueous-alcoholic extract of ginseng can affect dopamine D2 receptors’ pain sensitivity. Methods: We used 45 adult male rats weighing 250±20 for this study. Animals were maintained in a standard condition at a temperature of 21°C–24°C. The experimental groups were as follows: 1. Sham 1 (intraperitoneal [IP] injection of normal saline); 2. Sham 2 (intracerebroventricular [ICV] injection of artificial cerebrospinal fluid [ACSF]); 3. Experimental 1 (IP injection of ginseng extract); 4 and 5. Experimental groups 2 and 3 (IP injection of ginseng extract + bromocriptine 10 and 30 μg/rat by ICV injection); 6 and 7) experimental groups 4 and 5 (IP injection of ginseng extract + chlorpromazine 20 and 40 μg/rat by ICV injection). Ginseng extract 100 mg/kg/d was used for 7 days. Pain sensitivity test was done in all groups with the formalin test. Lateral ventricles of the rats were cannulated unilaterally by the stereotaxic procedure. Results: Our data showed that ginseng (100 mg/kg/d) significantly (P<0.05) decreased pain sensitivity compared to the sham 1 group. Bromocriptine in two doses significantly decreased pain sensitivity compared to the sham 2 group. Chlorpromazine in high doses significantly increased pain sensitivity compared to the sham 2 group. Conclusion: The present results indicate that ginseng can modulate the D2 receptor of the dopamine system in the control of pain sensitivity in the formalin test. Because bromocriptine and ginseng have similar effects, it seems that they had synergistic effects.
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Affiliation(s)
- Mahnaz Taherianfard
- Department of Basic Sciences, School of Veterinary Medicine, Shiraz University, Shiraz, Iran
| | - Somaye Aalami
- Department of Basic Sciences, School of Veterinary Medicine, Shiraz University, Shiraz, Iran
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Zunhammer M, Gerardi M, Bingel U. The effect of dopamine on conditioned placebo analgesia in healthy individuals: a double-blind randomized trial. Psychopharmacology (Berl) 2018; 235:2587-2595. [PMID: 29943093 DOI: 10.1007/s00213-018-4951-3] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/26/2018] [Accepted: 06/18/2018] [Indexed: 12/12/2022]
Abstract
RATIONALE Better means to control placebo effects are key to optimizing treatment outcomes. Dopamine-based reward and learning mechanisms have been hypothesized to drive placebo effects. Here, we tested whether dopamine augmentation can modulate learned placebo effects. METHODS We performed a randomized, double-blind parallel group study with 70 healthy adult participants to test whether a single oral dose of the dopamine precursor levodopa/carbidopa (100/25 mg) administered before the acquisition of conditioned placebo analgesia enhances the placebo response in an established experimental placebo model using heat pain. RESULTS Overall, the observed levels of placebo analgesia in our sample were low and not statistically significant. Levodopa, compared to placebo, only led to a marginal increase in placebo analgesia. Female participants tended to show larger placebo responses than male participants. Within the female subgroup, levodopa showed small-to-moderate effects on placebo analgesia; however, this effect was not statistically significant. CONCLUSIONS In summary, the present study could not provide evidence for a placebo augmenting effect of levodopa-enhanced dopamine levels in healthy subjects. Further studies are needed to elucidate whether placebo enhancement can be achieved through dopamine augmentation.
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Affiliation(s)
- Matthias Zunhammer
- Klinik für Neurologie, Universitätsklinikum Essen, Hufelandstraße 55, 45147, Essen, Germany.
| | - Magnus Gerardi
- Klinik für Neurologie, Universitätsklinikum Essen, Hufelandstraße 55, 45147, Essen, Germany
| | - Ulrike Bingel
- Klinik für Neurologie, Universitätsklinikum Essen, Hufelandstraße 55, 45147, Essen, Germany
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The effects of a dopamine agonist (apomorphine) on experimental and spontaneous pain in patients with chronic radicular pain: A randomized, double-blind, placebo-controlled, cross-over study. PLoS One 2018; 13:e0195287. [PMID: 29621293 PMCID: PMC5886417 DOI: 10.1371/journal.pone.0195287] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2016] [Accepted: 02/15/2018] [Indexed: 11/29/2022] Open
Abstract
Background Although evidence suggests that dopaminergic systems are involved in pain processing, the effects of dopaminergic interventions on pain remains questionable. This randomized, double blinded, placebo-controlled, cross-over study was aimed at exploring the effect of the dopamine agonist apomorphine on experimental pain evoked by cold stimulation and on spontaneous pain in patients with lumbar radicular (neuropathic) pain. Methods Data was collected from 35 patients with chronic lumbar radiculopathy (18 men, mean age 56.2±13 years). The following parameters were evaluated before (baseline) and 30, 75 and 120 minutes subsequent to a subcutaneous injection of 1.5 mg apomorphine or placebo: cold pain threshold and tolerance in the painful site (ice pack, affected leg) and in a remote non-painful site (12°C water bath, hand), and spontaneous (affected leg) pain intensity (NPS, 0–100). Results One-hundred and twenty minutes following apomorphine (but not placebo) injection, cold pain threshold and tolerance in the hand increased significantly compared to baseline (from a median of 8.0 seconds (IQR = 5.0) to 10 seconds (IQR = 9.0), p = 0.001 and from a median of 19.5 seconds (IQR = 30.2) to 27.0 seconds (IQR = 37.5), p<0.001, respectively). In addition, apomorphine prolonged cold pain tolerance but not threshold in the painful site (from a median of 43.0 seconds (IQR = 63.0) at baseline to 51.0 seconds (IQR = 78.0) at 120 min, p = 0.02). Apomorphine demonstrated no superiority over placebo in reducing spontaneous pain intensity. Conclusion These findings are in line with previous results in healthy subjects, showing that apomorphine increases the ability to tolerate cold pain and therefore suggesting that dopaminergic interventions can have potential clinical relevance.
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Brain Reward Circuit and Pain. ADVANCES IN PAIN RESEARCH: MECHANISMS AND MODULATION OF CHRONIC PAIN 2018; 1099:201-210. [DOI: 10.1007/978-981-13-1756-9_17] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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13
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Watanabe M, Narita M, Hamada Y, Yamashita A, Tamura H, Ikegami D, Kondo T, Shinzato T, Shimizu T, Fukuchi Y, Muto A, Okano H, Yamanaka A, Tawfik VL, Kuzumaki N, Navratilova E, Porreca F, Narita M. Activation of ventral tegmental area dopaminergic neurons reverses pathological allodynia resulting from nerve injury or bone cancer. Mol Pain 2018; 14:1744806918756406. [PMID: 29357732 PMCID: PMC5802605 DOI: 10.1177/1744806918756406] [Citation(s) in RCA: 52] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2017] [Revised: 12/03/2017] [Accepted: 12/13/2017] [Indexed: 02/02/2023] Open
Abstract
Chronic pain induced by nerve damage due to trauma or invasion of cancer to the bone elicits severe ongoing pain as well as hyperalgesia and allodynia likely reflecting adaptive changes within central circuits that amplify nociceptive signals. The present study explored the possible contribution of the mesolimbic dopaminergic circuit in promoting allodynia related to neuropathic and cancer pain. Mice with ligation of the sciatic nerve or treated with intrafemoral osteosarcoma cells showed allodynia to a thermal stimulus applied to the paw on the injured side. Patch clamp electrophysiology revealed that the intrinsic neuronal excitability of ventral tegmental area (VTA) dopamine neurons projecting to the nucleus accumbens (N.Acc.) was significantly reduced in those mice. We used tyrosine hydroxylase (TH)-cre mice that were microinjected with adeno-associated virus (AAV) to express channelrhodopsin-2 (ChR2) to allow optogenetic stimulation of VTA dopaminergic neurons in the VTA or in their N.Acc. terminals. Optogenetic activation of these cells produced a significant but transient anti-allodynic effect in nerve injured or tumor-bearing mice without increasing response thresholds to thermal stimulation in sham-operated animals. Suppressed activity of mesolimbic dopaminergic neurons is likely to contribute to decreased inhibition of N.Acc. output neurons and to neuropathic or cancer pain-induced allodynia suggesting strategies for modulation of pathological pain states.
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Affiliation(s)
- Moe Watanabe
- Department of Pharmacology, Hoshi University School of Pharmacy and Pharmaceutical Sciences, Shinagawa-ku, Tokyo, Japan
| | - Michiko Narita
- Department of Pharmacology, Hoshi University School of Pharmacy and Pharmaceutical Sciences, Shinagawa-ku, Tokyo, Japan
| | - Yusuke Hamada
- Department of Pharmacology, Hoshi University School of Pharmacy and Pharmaceutical Sciences, Shinagawa-ku, Tokyo, Japan
| | - Akira Yamashita
- Department of Pharmacology, Hoshi University School of Pharmacy and Pharmaceutical Sciences, Shinagawa-ku, Tokyo, Japan
| | - Hideki Tamura
- Life Science Tokyo Advanced Research Center (L-StaR), Hoshi University School of Pharmacy and Pharmaceutical Sciences, Shinagawa-ku, Tokyo, Japan
| | - Daigo Ikegami
- Department of Pharmacology, Hoshi University School of Pharmacy and Pharmaceutical Sciences, Shinagawa-ku, Tokyo, Japan
- Department of Pharmacology, Arizona Health Sciences Center, University of Arizona, Tucson, AZ, USA
| | - Takashige Kondo
- Department of Pharmacology, Hoshi University School of Pharmacy and Pharmaceutical Sciences, Shinagawa-ku, Tokyo, Japan
| | - Tatsuto Shinzato
- Department of Pharmacology, Hoshi University School of Pharmacy and Pharmaceutical Sciences, Shinagawa-ku, Tokyo, Japan
| | - Takatsune Shimizu
- Department of Pathophysiology, Hoshi University School of Pharmacy and Pharmaceutical Sciences, Shinagawa-ku, Tokyo, Japan
| | - Yumi Fukuchi
- Department of Pathophysiology, Hoshi University School of Pharmacy and Pharmaceutical Sciences, Shinagawa-ku, Tokyo, Japan
| | - Akihiro Muto
- Department of Pathophysiology, Hoshi University School of Pharmacy and Pharmaceutical Sciences, Shinagawa-ku, Tokyo, Japan
| | - Hideyuki Okano
- Life Science Tokyo Advanced Research Center (L-StaR), Hoshi University School of Pharmacy and Pharmaceutical Sciences, Shinagawa-ku, Tokyo, Japan
- Department of Physiology, Keio University School of Medicine, Shinjuku-ku, Tokyo, Japan
| | - Akihiro Yamanaka
- Department of Neuroscience II, Research Institute of Environmental Medicine, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Japan
| | - Vivianne L Tawfik
- Department of Anesthesiology, Perioperative and Pain Medicine, Stanford University School of Medicine, Palo Alto, CA, USA
| | - Naoko Kuzumaki
- Department of Pharmacology, Hoshi University School of Pharmacy and Pharmaceutical Sciences, Shinagawa-ku, Tokyo, Japan
| | - Edita Navratilova
- Department of Pharmacology, Arizona Health Sciences Center, University of Arizona, Tucson, AZ, USA
| | - Frank Porreca
- Department of Pharmacology, Arizona Health Sciences Center, University of Arizona, Tucson, AZ, USA
| | - Minoru Narita
- Department of Pharmacology, Hoshi University School of Pharmacy and Pharmaceutical Sciences, Shinagawa-ku, Tokyo, Japan
- Life Science Tokyo Advanced Research Center (L-StaR), Hoshi University School of Pharmacy and Pharmaceutical Sciences, Shinagawa-ku, Tokyo, Japan
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14
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Bauch EM, Andreou C, Rausch VH, Bunzeck N. Neural Habituation to Painful Stimuli Is Modulated by Dopamine: Evidence from a Pharmacological fMRI Study. Front Hum Neurosci 2017; 11:630. [PMID: 29311880 PMCID: PMC5742644 DOI: 10.3389/fnhum.2017.00630] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2017] [Accepted: 12/11/2017] [Indexed: 12/22/2022] Open
Abstract
In constantly changing environments, it is crucial to adaptively respond to threatening events. In particular, painful stimuli are not only processed in terms of their absolute intensity, but also with respect to their context. While contextual pain processing can simply entail the repeated processing of information (i.e., habituation), it can, in a more complex form, be expressed through predictions of magnitude before the delivery of nociceptive information (i.e., adaptive coding). Here, we investigated the brain regions involved in the adaptation to nociceptive electrical stimulation as well as their link to dopaminergic neurotransmission (placebo/haloperidol). The main finding is that haloperidol changed the habituation to the absolute pain intensity over time. More precisely, in the placebo condition, activity in left postcentral gyrus and midcingulate cortex increased linearly with pain intensity only in the beginning of the experiment and subsequently habituated. In contrast, when the dopaminergic system was blocked by haloperidol, a linear increase with pain intensity was present throughout the entire experiment. Finally, there were no adaptive coding effects in any brain regions. Together, our findings provide novel insights into the nature of pain processing by suggesting that dopaminergic neurotransmission plays a specific role for the habituation to painful stimuli over time.
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Affiliation(s)
- Eva M Bauch
- Department of Systems Neuroscience, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.,Medical School Hamburg (MSH), University of Applied Science and Medical University, Hamburg, Germany
| | - Christina Andreou
- Center for Gender Research and Early Detection, University Psychiatric Clinics Basel, Basel, Switzerland
| | - Vanessa H Rausch
- Department of Systems Neuroscience, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.,Department of Diagnostic and Interventional Radiology and Nuclear Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Nico Bunzeck
- Department of Systems Neuroscience, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.,Institute of Psychology I, University of Lübeck, Lübeck, Germany
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15
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Ono K, Viet CT, Ye Y, Dang D, Hitomi S, Toyono T, Inenaga K, Dolan JC, Schmidt BL. Cutaneous pigmentation modulates skin sensitivity via tyrosinase-dependent dopaminergic signalling. Sci Rep 2017; 7:9181. [PMID: 28835637 PMCID: PMC5569050 DOI: 10.1038/s41598-017-09682-4] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2017] [Accepted: 07/27/2017] [Indexed: 12/19/2022] Open
Abstract
We propose a new mechanism of sensory modulation through cutaneous dopaminergic signalling. We hypothesize that dopaminergic signalling contributes to differential cutaneous sensitivity in darker versus lighter pigmented humans and mouse strains. We show that thermal and mechanical cutaneous sensitivity is pigmentation dependent. Meta-analyses in humans and mice, along with our own mouse behavioural studies, reveal higher thermal sensitivity in pigmented skin relative to less-pigmented or albino skin. We show that dopamine from melanocytes activates the D1-like dopamine receptor on primary sensory neurons. Dopaminergic activation increases expression of the heat-sensitive TRPV1 ion channel and reduces expression of the mechanically-sensitive Piezo2 channel; thermal threshold is lower and mechanical threshold is higher in pigmented skin.
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Affiliation(s)
- Kentaro Ono
- Bluestone Centre for Clinical Research, New York University College of Dentistry, New York, NY, 10010, USA
| | - Chi T Viet
- Bluestone Centre for Clinical Research, New York University College of Dentistry, New York, NY, 10010, USA.,Department of Oral Maxillofacial Surgery, New York University College of Dentistry, New York, NY, 10010, USA
| | - Yi Ye
- Bluestone Centre for Clinical Research, New York University College of Dentistry, New York, NY, 10010, USA
| | - Dongmin Dang
- Bluestone Centre for Clinical Research, New York University College of Dentistry, New York, NY, 10010, USA
| | - Suzuro Hitomi
- Division of Physiology, Kyushu Dental University, Kitakyushu, Fukuoka, 803-8580, Japan
| | - Takashi Toyono
- Division of Oral Anatomy, Kyushu Dental University, Kitakyushu, Fukuoka, 803-8580, Japan
| | - Kiyotoshi Inenaga
- Division of Physiology, Kyushu Dental University, Kitakyushu, Fukuoka, 803-8580, Japan
| | - John C Dolan
- Bluestone Centre for Clinical Research, New York University College of Dentistry, New York, NY, 10010, USA.,Department of Oral Maxillofacial Surgery, New York University College of Dentistry, New York, NY, 10010, USA
| | - Brian L Schmidt
- Bluestone Centre for Clinical Research, New York University College of Dentistry, New York, NY, 10010, USA. .,Department of Oral Maxillofacial Surgery, New York University College of Dentistry, New York, NY, 10010, USA.
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16
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Subjective utility moderates bidirectional effects of conflicting motivations on pain perception. Sci Rep 2017; 7:7790. [PMID: 28798478 PMCID: PMC5552734 DOI: 10.1038/s41598-017-08454-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2017] [Accepted: 07/12/2017] [Indexed: 01/15/2023] Open
Abstract
Minimizing pain and maximizing pleasure are conflicting motivations when pain and reward co-occur. Decisions to prioritize reward consumption or pain avoidance are assumed to lead to pain inhibition or facilitation, respectively. Such decisions are a function of the subjective utility of the stimuli involved, i.e. the relative value assigned to the stimuli to compare the potential outcomes of a decision. To test perceptual pain modulation by varying degrees of motivational conflicts and the role of subjective utility, we implemented a task in which healthy volunteers had to decide between accepting a reward at the cost of receiving a nociceptive electrocutaneous stimulus or rejecting both. Subjective utility of the stimuli was assessed by a matching task between the stimuli. Accepting reward coupled to a nociceptive stimulus resulted in decreased perceived intensity, while rejecting the reward to avoid pain resulted in increased perceived intensity, but in both cases only if a high motivational conflict was present. Subjective utility of the stimuli involved moderated these bidirectional perceptual effects: the more a person valued money over pain, the more perceived intensity increased or decreased. These findings demonstrate pain modulation when pain and reward are simultaneously present and highlight the importance of subjective utility for such modulation.
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17
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Methylphenidate attenuates the response to cold pain but not to aversive auditory stimuli in healthy human: a double-blind randomized controlled study. Pain Rep 2017; 2:e593. [PMID: 29392209 PMCID: PMC5741299 DOI: 10.1097/pr9.0000000000000593] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2016] [Revised: 02/04/2017] [Accepted: 03/10/2017] [Indexed: 11/26/2022] Open
Abstract
This double-blind, crossover, randomized placebo-controlled study found that methylphenidate has a specific effect on nociceptive pathways rather than a generalized effect on aversive sensory modalities. Introduction: We recently showed that the psycho-stimulant norepinephrine–dopamine reuptake inhibitor methylphenidate (MP) prolonged cold pain threshold and tolerance in adults with attention-deficit hyperactivity disorder (ADHD). Objectives: The objectives of the present study were to: (1) examine whether MP has antinociceptive properties in healthy men; (2) test MP's effects on responses to aversive auditory stimuli. The underlying aim was to determine whether MP exerts antinociceptive properties or more generalized, nonspecific attenuating effects on different aversive sensory modalities. Methods: This double-blind, crossover, randomized placebo-controlled study consisted of 2 sessions one week apart from each other. In each session, pain threshold (seconds) and tolerance (seconds) in response to painful cold stimulation were measured. Additionally, threshold (dB) and tolerance (seconds) to loud aversive auditory stimuli (500 Hz, 2000 Hz and white noise) were also tested prior to and 2 hours following the administration of a single dose of either 20 mg MP or an identical looking placebo. Results: Forty men, 26.1 ± 4.0 (mean ± SD) years were enrolled in the study. Wilcoxon signed-rank test analyses showed that MP, but not the placebo, produced a significant increase in cold pain threshold (from 4.1 ± 2.6 to 5.4 ± 3.1 seconds, P = 0.001 and from 4.5 ± 2.6 to 4.3 ± 2.7 seconds, P = 0.2, respectively) and tolerance (from 57.8 ± 54.0 to 73.8 ± 61.8 seconds, P = 0.001 and from 52.5 ± 53.7 sec to 57.0 ± 52.9 seconds, P = 0.1, respectively). No significant changes were found in any of the auditory parameters. Conclusion: These results suggest that MP has an effect on nociceptive pathways rather than a nonspecific, generalized attenuating effect on aversive sensory stimuli.
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18
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Relation of dopamine receptor 2 binding to pain perception in female fibromyalgia patients with and without depression--A [¹¹C] raclopride PET-study. Eur Neuropsychopharmacol 2016; 26:320-330. [PMID: 26708319 DOI: 10.1016/j.euroneuro.2015.12.007] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/02/2014] [Revised: 08/26/2015] [Accepted: 12/01/2015] [Indexed: 12/17/2022]
Abstract
Dopamine D2/D3 receptor availability at rest and its association with individual pain perception was investigated using the [(11)C] raclopride PET-method in 24 female Fibromyalgia (FMS) participants with (FMS+, N=11) and without (FMS-, N=13) comorbid depression and in 17 healthy women. Thermal pain thresholds (TPT) and pain responses were assessed outside the scanner. We compared the discriminative capacity, i.e. the individual׳s capacity to discriminate between lower and higher pain intensities and the response criterion, i.e. the subject׳s tendency to report pain during noxious stimulation due to psychological factors. [(11)C] raclopride binding potential (BP), defined as the ratio of specifically bound non-displaceable radioligand at equilibrium (BP(ND)) was used as measure of D2/D3 receptor availability. We found significant group effects of BP(ND) in striatal regions (left ventral striatum, left caudate nucleus and left nucleus accumbens) between FMS+ and FMS- compared to healthy subjects. Correlational analysis showed negative associations between TPT and D2/D3 receptor availability in the left caudate nucleus in FMS-, between TPT and D2/D3 receptor availability in the right caudate nucleus in FMS + and positive associations between TPT and D2/D3 receptor availability in the left putamen and right caudate nucleus in healthy controls. The response criterion was positively associated with D2/D3 receptor availability in the right nucleus accumbens in FMS - and negatively with D2/D3 receptor availability in the left caudate nucleus in healthy controls. Finally, no significant associations between D2/D3 receptor availability and discriminative capacity in any of the groups or regions were determined. These findings provide further support for a disruption of dopaminergic neurotransmission in FMS and implicate DA as important neurochemical moderator of differences in pain perception in FMS patients with and without co-morbid depression.
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19
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Chronic Back Pain Is Associated with Alterations in Dopamine Neurotransmission in the Ventral Striatum. J Neurosci 2015; 35:9957-65. [PMID: 26156996 DOI: 10.1523/jneurosci.4605-14.2015] [Citation(s) in RCA: 118] [Impact Index Per Article: 13.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
UNLABELLED Back pain is common in the general population, but only a subgroup of back pain patients develops a disabling chronic pain state. The reasons for this are incompletely understood, but recent evidence implies that both preexisting and pain-related variations in the structure and function of the nervous system may contribute significantly to the development of chronic pain. Here, we addressed the role of striatal dopamine (DA) D2/D3 receptor (D2/D3R) function in chronic non-neuropathic back pain (CNBP) by comparing CNBP patients and healthy controls using PET and the D2/D3R-selective radioligand [(11)C]raclopride. D2/D3R availability was measured at baseline and during a pain challenge, yielding in vivo measures of receptor availability (binding potential, BPND) and DA release (change in BPND from baseline to activated state). At baseline, CNBP patients demonstrated reductions in D2/D3R BPND in the ventral striatum compared with controls. These reductions were associated with greater positive affect scores and pain tolerance measures. The reductions in D2/D3R BPND were also correlated with μ-opioid receptor BPND and pain-induced endogenous opioid system activation in the amygdala, further associated with measures of positive affect, the affective component of back pain and pain tolerance. During the pain challenge, lower magnitudes of DA release, and therefore D2/D3R activation, were also found in the ventral striatum in the CNBP sample compared with controls. Our results show that CNBP is associated with adaptations in ventral striatal D2/D3R function, which, together with endogenous opioid system function, contribute to the sensory and affective-motivational features of CNBP. SIGNIFICANCE STATEMENT The neural systems that underlie chronic pain remain poorly understood. Here, using PET, we provide insight into the molecular mechanisms that regulate sensory and affective dimensions of pain in chronic back pain patients. We found that patients with back pain have alterations in brain dopamine function that are associated with measures of pain sensitivity and affective state, but also with brain endogenous opioid system functional measures. These findings suggest that brain dopamine-opioid interactions are involved in the pathophysiology of chronic pain, which has potential therapeutic implications. Our results may also help to explain individual variation in susceptibility to opioid medication misuse and eventual addiction in the context of chronic pain.
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20
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Zhang LQ, Sa F, Chong CM, Wang Y, Zhou ZY, Chang RCC, Chan SW, Hoi PM, Yuen Lee SM. Schisantherin A protects against 6-OHDA-induced dopaminergic neuron damage in zebrafish and cytotoxicity in SH-SY5Y cells through the ROS/NO and AKT/GSK3β pathways. JOURNAL OF ETHNOPHARMACOLOGY 2015; 170:8-15. [PMID: 25934514 DOI: 10.1016/j.jep.2015.04.040] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/26/2015] [Revised: 03/16/2015] [Accepted: 04/20/2015] [Indexed: 05/27/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE The fruit of Schisandra chinensis (Turcz.) Baill, has been traditionally used in management of liver diseases and ageing associated neurodegeneration. The bioactive compound from this medicinal plant would be valuable for its potential use in prevention and treatment of Parkinson׳s disease. AIM OF THE STUDY The overall objective of the present study was to understand the neuroprotective effect of schisantherin A, a dibenzocyclooctadiene lignan from the fruit of S. chinensis (Turcz.) Baill, and to elucidate its underlying mechanism of action. MATERIAL AND METHODS This study investigated the protective effect of schisantherin A against selective dopaminergic neurotoxin 6-hydroxydopamine (6-OHDA)-induced neural damage in human neuroblastoma SH-SY5Y cells and zebrafish models. Oxidative stress and related signaling pathways underlying the neuroprotective effect were determined by multiple biochemical assays and Western blot. RESULTS Pretreatment with schisantherin A offered neuroprotection against 6-OHDA-induced SH-SY5Y cytotoxicity. Moreover, schisantherin A could prevent 6-OHDA-stimulated dopaminergic neuron loss in zebrafish. Our mechanistic study showed that schisantherin A can regulate intracellular ROS accumulation, and inhibit NO overproduction by down-regulating the over-expression of iNOS in 6-OHDA treated SH-SY5Y cells. Schisantherin A also protects against 6-OHDA-mediated activation of MAPKs, PI3K/Akt and GSK3β. CONCLUSION These findings demonstrate that schisantherin A may have potential therapeutic value for neurodegenerative diseases associated with abnormal oxidative stress such as Parkinson׳s disease.
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Affiliation(s)
- Lun Qing Zhang
- State Key Laboratory of Quality Research of Chinese Medicine and Institute of Chinese Medical Sciences, University of Macau, Macao, China
| | - Fei Sa
- State Key Laboratory of Quality Research of Chinese Medicine and Institute of Chinese Medical Sciences, University of Macau, Macao, China
| | - Cheong Meng Chong
- State Key Laboratory of Quality Research of Chinese Medicine and Institute of Chinese Medical Sciences, University of Macau, Macao, China
| | - Ying Wang
- State Key Laboratory of Quality Research of Chinese Medicine and Institute of Chinese Medical Sciences, University of Macau, Macao, China
| | - Zhong Yan Zhou
- State Key Laboratory of Quality Research of Chinese Medicine and Institute of Chinese Medical Sciences, University of Macau, Macao, China
| | - Raymond Chuen Chung Chang
- Laboratory of Neurodegenerative Diseases, LKS Faculty of Medicine, and State Key Laboratory of Brain and Cognitive Sciences, The University of Hong Kong, Pokfulam, Hong Kong, China
| | - Shun Wan Chan
- Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hong Kong, China; State Key Laboratory of Chinese Medicine and Molecular Pharmacology (Incubation), Shenzhen, China
| | - Pui Man Hoi
- State Key Laboratory of Quality Research of Chinese Medicine and Institute of Chinese Medical Sciences, University of Macau, Macao, China
| | - Simon Ming Yuen Lee
- State Key Laboratory of Quality Research of Chinese Medicine and Institute of Chinese Medical Sciences, University of Macau, Macao, China.
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Spinal dopaminergic projections control the transition to pathological pain plasticity via a D1/D5-mediated mechanism. J Neurosci 2015; 35:6307-17. [PMID: 25904784 DOI: 10.1523/jneurosci.3481-14.2015] [Citation(s) in RCA: 58] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The mechanisms that lead to the maintenance of chronic pain states are poorly understood, but their elucidation could lead to new insights into how pain becomes chronic and how it can potentially be reversed. We investigated the role of spinal dorsal horn neurons and descending circuitry in plasticity mediating a transition to pathological pain plasticity suggesting the presence of a chronic pain state using hyperalgesic priming. We found that when dorsal horn neurokinin 1 receptor-positive neurons or descending serotonergic neurons were ablated before hyperalgesic priming, IL-6- and carrageenan-induced mechanical hypersensitivity was impaired, and subsequent prostaglandin E2 (PGE2) response was blunted. However, when these neurons were lesioned after the induction of priming, they had no effect on the PGE2 response, reflecting differential mechanisms driving plasticity in a primed state. In stark contrast, animals with a spinally applied dopaminergic lesion showed intact IL-6- and carrageenan-induced mechanical hypersensitivity, but the subsequent PGE2 injection failed to cause mechanical hypersensitivity. Moreover, ablating spinally projecting dopaminergic neurons after the resolution of the IL-6- or carrageenan-induced response also reversed the maintenance of priming as assessed through mechanical hypersensitivity and the mouse grimace scale. Pharmacological antagonism of spinal dopamine D1/D5 receptors reversed priming, whereas D1/D5 agonists induced mechanical hypersensitivity exclusively in primed mice. Strikingly, engagement of D1/D5 coupled with anisomycin in primed animals reversed a chronic pain state, consistent with reconsolidation-like effects in the spinal dorsal horn. These findings demonstrate a novel role for descending dopaminergic neurons in the maintenance of pathological pain plasticity.
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22
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Effects of the Fourth Ventricle Compression in the Regulation of the Autonomic Nervous System: A Randomized Control Trial. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE 2015. [PMID: 26199632 PMCID: PMC4496659 DOI: 10.1155/2015/148285] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Introduction. Dysfunction of the autonomic nervous system is an important factor in the development of chronic pain. Fourth ventricle compression (CV-4) has been shown to influence autonomic activity. Nevertheless, the physiological mechanisms behind these effects remain unclear. Objectives. This study is aimed at evaluating the effects of fourth ventricle compression on the autonomic nervous system. Methods. Forty healthy adults were randomly assigned to an intervention group, on whom CV-4 was performed, or to a control group, who received a placebo intervention (nontherapeutic touch on the occipital bone). In both groups, plasmatic catecholamine levels, blood pressure, and heart rate were measured before and immediately after the intervention. Results. No effects related to the intervention were found. Although a reduction of norepinephrine, systolic blood pressure, and heart rate was found after the intervention, it was not exclusive to the intervention group. In fact, only the control group showed an increment of dopamine levels after intervention. Conclusion. Fourth ventricle compression seems not to have any effect in plasmatic catecholamine levels, blood pressure, or heart rate. Further studies are needed to clarify the CV-4 physiologic mechanisms and clinical efficacy in autonomic regulation and pain treatment.
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23
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Sa F, Zhang LQ, Chong CM, Guo BJ, Li S, Zhang ZJ, Zheng Y, Hoi PM, Lee SMY. Discovery of novel anti-parkinsonian effect of schisantherin A in in vitro and in vivo. Neurosci Lett 2015; 593:7-12. [DOI: 10.1016/j.neulet.2015.03.016] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2015] [Revised: 02/26/2015] [Accepted: 03/08/2015] [Indexed: 12/17/2022]
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24
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Haloperidol blocks dorsal striatum activity but not analgesia in a placebo paradigm. Cortex 2014; 57:60-73. [DOI: 10.1016/j.cortex.2014.02.023] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2013] [Revised: 10/08/2013] [Accepted: 02/27/2014] [Indexed: 12/19/2022]
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25
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Tiemann L, Heitmann H, Schulz E, Baumkötter J, Ploner M. Dopamine precursor depletion influences pain affect rather than pain sensation. PLoS One 2014; 9:e96167. [PMID: 24760082 PMCID: PMC3997524 DOI: 10.1371/journal.pone.0096167] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2013] [Accepted: 04/03/2014] [Indexed: 01/15/2023] Open
Abstract
Pain is a multidimensional experience, which includes sensory, cognitive, and affective aspects. Converging lines of evidence indicate that dopaminergic neurotransmission plays an important role in human pain perception. However, the precise effects of dopamine on different aspects of pain perception remain to be elucidated. To address this question, we experimentally decreased dopaminergic neurotransmission in 22 healthy human subjects using Acute Phenylalanine and Tyrosine Depletion (APTD). During APTD and a control condition we applied brief painful laser stimuli to the hand, assessed different aspects of pain perception, and recorded electroencephalographic responses. APTD-induced decreases of cerebral dopaminergic activity did not influence sensory aspects of pain perception. In contrast, APTD yielded increases of pain unpleasantness. The increases of unpleasantness ratings positively correlated with effectiveness of APTD. Our finding of an influence of dopaminergic neurotransmission on affective but not sensory aspects of phasic pain suggests that analgesic effects of dopamine might be mediated by indirect effects on pain affect rather than by direct effects on ascending nociceptive signals. These findings contribute to our understanding of the complex relationship between dopamine and pain perception, which may play a role in various clinical pain states.
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Affiliation(s)
- Laura Tiemann
- Department of Neurology, Technische Universität München, Munich, Germany
- TUM-Neuroimaging Center, Technische Universität München, Munich, Germany
- * E-mail:
| | - Henrik Heitmann
- Department of Neurology, Technische Universität München, Munich, Germany
- TUM-Neuroimaging Center, Technische Universität München, Munich, Germany
| | - Enrico Schulz
- Department of Neurology, Technische Universität München, Munich, Germany
- TUM-Neuroimaging Center, Technische Universität München, Munich, Germany
| | - Jochen Baumkötter
- Department of Pediatrics, Technische Universität München, Munich, Germany
| | - Markus Ploner
- Department of Neurology, Technische Universität München, Munich, Germany
- TUM-Neuroimaging Center, Technische Universität München, Munich, Germany
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