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Molecular and Cellular Mechanisms of Pain

A special issue of International Journal of Molecular Sciences (ISSN 1422-0067). This special issue belongs to the section "Biochemistry".

Deadline for manuscript submissions: closed (20 August 2015) | Viewed by 53071

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Guest Editor
Pharmazentrum Frankfurt, Dept. of Clinical Pharmacology, Goethe-University of Frankfurt, Theodor Stern Kai 7, Bd. 74, 4th Fl, 60590 Frankfurt am Main, Germany
Interests: nerve injury and neuropathic pain; pain and aging; central adaptations to chronic pain; multiple sclerosis; neuroinflammation; neuro-immunologic communication; redox signaling; nitric oxide; endocannabinoids and other lipid signaling molecules; progranulin; autophagy
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Dear Colleagues,

Growing numbers of molecules have been suggested to contribute to the development of chronic inflammatory or neuropathic pain. Based on rodent models, some of these molecules have potential as drug targets, such as fatty acid amide hydrolase, which regulates the metabolism of endocannabinoids, and GTP cyclohydrolase, which is the key enzyme in tetrahydrobiopterin synthesis. However, so far, no compounds have reached clinical practice and patients have few therapeutic options. No matter the reason for the pain, treatment focuses on symptom relief, but does not address or cure the underlying pathology of pain signaling. Available therapeutics either target opioid and cannabinoid receptors or cyclooxygenases or nonspecifically lower neuronal excitability. Pain relief via these drugs is associated with side effects. Therefore, there is still a high clinical need for novel pain-therapeutics that would address the underlying causes. Thus, there is a continuing search for targetable molecules and cellular processes, such as neuronal death. Also, there is continuing research concerning the interplay of neurons, glial cells, and immune cells. One approach is the targeting of activated (micro)glia for treatment of neuropathic pain because these cells produce pro-inflammatory substances, which maintain hyperexcitability in nociceptive neurons, even if the nerve injury is healed. The glia activation is driven by, e.g., specific purine receptors, cytokines, and growth factors, and are inhibited by inflammation resolving lipid signaling molecules, which are all potentially interesting drug targets. Transient receptor potential channels and specific sodium channels are long known as key molecules for nociception and there are some intelligent drugs that enter through one channel and then target the other from inside (to confer some specificity). However, successful pain reduction in rodents only moderately predicts efficacy in humans, because the pain goes far beyond nociception and behavioral tests in rodents rely mostly on the stimulation of an inflamed or nerve injured paw, but do not measure spontaneous pain or long-term adaptive changes in pain-associated centers. Thus, pain-causing or pain-resolving molecules must be seen in a broader context of pain as a systemic disease.

Prof. Dr. Irmgard Tegeder
Guest Editor

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Keywords

  • microglia
  • neuronal apoptosis
  • purine receptors
  • TRP channels
  • cytokines
  • hyperexcitability
  • cannabinoids
  • opioids
  • lipid signaling molecules

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Published Papers (5 papers)

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Research

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4684 KiB  
Article
Spinal Cord T-Cell Infiltration in the Rat Spared Nerve Injury Model: A Time Course Study
by Christophe Gattlen, Christine B. Clarke, Nicolas Piller, Guylène Kirschmann, Marie Pertin, Isabelle Decosterd, Romain-Daniel Gosselin and Marc R. Suter
Int. J. Mol. Sci. 2016, 17(3), 352; https://doi.org/10.3390/ijms17030352 - 9 Mar 2016
Cited by 36 | Viewed by 9136
Abstract
The immune system is involved in the development of neuropathic pain. In particular, the infiltration of T-lymphocytes into the spinal cord following peripheral nerve injury has been described as a contributor to sensory hypersensitivity. We used the spared nerve injury (SNI) model of [...] Read more.
The immune system is involved in the development of neuropathic pain. In particular, the infiltration of T-lymphocytes into the spinal cord following peripheral nerve injury has been described as a contributor to sensory hypersensitivity. We used the spared nerve injury (SNI) model of neuropathic pain in Sprague Dawley adult male rats to assess proliferation, and/or protein/gene expression levels for microglia (Iba1), T-lymphocytes (CD2) and cytotoxic T-lymphocytes (CD8). In the dorsal horn ipsilateral to SNI, Iba1 and BrdU stainings revealed microglial reactivity and proliferation, respectively, with different durations. Iba1 expression peaked at D4 and D7 at the mRNA and protein level, respectively, and was long-lasting. Proliferation occurred almost exclusively in Iba1 positive cells and peaked at D2. Gene expression observation by RT-qPCR array suggested that T-lymphocytes attracting chemokines were upregulated after SNI in rat spinal cord but only a few CD2/CD8 positive cells were found. A pronounced infiltration of CD2/CD8 positive T-cells was seen in the spinal cord injury (SCI) model used as a positive control for lymphocyte infiltration. Under these experimental conditions, we show early and long-lasting microglia reactivity in the spinal cord after SNI, but no lymphocyte infiltration was found. Full article
(This article belongs to the Special Issue Molecular and Cellular Mechanisms of Pain)
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1824 KiB  
Article
Age-Dependent Changes in the Inflammatory Nociceptive Behavior of Mice
by Tanya S. King-Himmelreich, Christine V. Möser, Miriam C. Wolters, Katrin Olbrich, Gerd Geisslinger and Ellen Niederberger
Int. J. Mol. Sci. 2015, 16(11), 27508-27519; https://doi.org/10.3390/ijms161126041 - 18 Nov 2015
Cited by 7 | Viewed by 5783
Abstract
The processing of pain undergoes several changes in aging that affect sensory nociceptive fibers and the endogenous neuronal inhibitory systems. So far, it is not completely clear whether age-induced modifications are associated with an increase or decrease in pain perception. In this study, [...] Read more.
The processing of pain undergoes several changes in aging that affect sensory nociceptive fibers and the endogenous neuronal inhibitory systems. So far, it is not completely clear whether age-induced modifications are associated with an increase or decrease in pain perception. In this study, we assessed the impact of age on inflammatory nociception in mice and the role of the hormonal inhibitory systems in this context. We investigated the nociceptive behavior of 12-month-old versus 6–8-week-old mice in two behavioral models of inflammatory nociception. Levels of TRP channels, and cortisol as well as cortisol targets, were measured by qPCR, ELISA, and Western blot in the differently aged mice. We observed an age-related reduction in nociceptive behavior during inflammation as well as a higher level of cortisol in the spinal cord of aged mice compared to young mice, while TRP channels were not reduced. Among potential cortisol targets, the NF-κB inhibitor protein alpha (IκBα) was increased, which might contribute to inhibition of NF-κB and a decreased expression and activity of the inducible nitric oxide synthase (iNOS). In conclusion, our results reveal a reduced nociceptive response in aged mice, which might be at least partially mediated by an augmented inflammation-induced increase in the hormonal inhibitory system involving cortisol. Full article
(This article belongs to the Special Issue Molecular and Cellular Mechanisms of Pain)
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1183 KiB  
Article
Identification of Molecular Fingerprints in Human Heat Pain Thresholds by Use of an Interactive Mixture Model R Toolbox (AdaptGauss)
by Alfred Ultsch, Michael C. Thrun, Onno Hansen-Goos and Jörn Lötsch
Int. J. Mol. Sci. 2015, 16(10), 25897-25911; https://doi.org/10.3390/ijms161025897 - 28 Oct 2015
Cited by 43 | Viewed by 9470
Abstract
Biomedical data obtained during cell experiments, laboratory animal research, or human studies often display a complex distribution. Statistical identification of subgroups in research data poses an analytical challenge. Here were introduce an interactive R-based bioinformatics tool, called “AdaptGauss”. It enables a valid identification [...] Read more.
Biomedical data obtained during cell experiments, laboratory animal research, or human studies often display a complex distribution. Statistical identification of subgroups in research data poses an analytical challenge. Here were introduce an interactive R-based bioinformatics tool, called “AdaptGauss”. It enables a valid identification of a biologically-meaningful multimodal structure in the data by fitting a Gaussian mixture model (GMM) to the data. The interface allows a supervised selection of the number of subgroups. This enables the expectation maximization (EM) algorithm to adapt more complex GMM than usually observed with a noninteractive approach. Interactively fitting a GMM to heat pain threshold data acquired from human volunteers revealed a distribution pattern with four Gaussian modes located at temperatures of 32.3, 37.2, 41.4, and 45.4 °C. Noninteractive fitting was unable to identify a meaningful data structure. Obtained results are compatible with known activity temperatures of different TRP ion channels suggesting the mechanistic contribution of different heat sensors to the perception of thermal pain. Thus, sophisticated analysis of the modal structure of biomedical data provides a basis for the mechanistic interpretation of the observations. As it may reflect the involvement of different TRP thermosensory ion channels, the analysis provides a starting point for hypothesis-driven laboratory experiments. Full article
(This article belongs to the Special Issue Molecular and Cellular Mechanisms of Pain)
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6283 KiB  
Article
Nerve Demyelination Increases Metabotropic Glutamate Receptor Subtype 5 Expression in Peripheral Painful Mononeuropathy
by Miau-Hwa Ko, Yu-Lin Hsieh, Sung-Tsang Hsieh and To-Jung Tseng
Int. J. Mol. Sci. 2015, 16(3), 4642-4665; https://doi.org/10.3390/ijms16034642 - 2 Mar 2015
Cited by 19 | Viewed by 6587
Abstract
Wallerian degeneration or nerve demyelination, arising from spinal nerve compression, is thought to bring on chronic neuropathic pain. The widely distributed metabotropic glutamate receptor subtype 5 (mGluR5) is involved in modulating nociceptive transmission. The purpose of this study was to investigate the potential [...] Read more.
Wallerian degeneration or nerve demyelination, arising from spinal nerve compression, is thought to bring on chronic neuropathic pain. The widely distributed metabotropic glutamate receptor subtype 5 (mGluR5) is involved in modulating nociceptive transmission. The purpose of this study was to investigate the potential effects of mGluR5 on peripheral hypersensitivities after chronic constriction injury (CCI). Sprague-Dawley rats were operated on with four loose ligatures around the sciatic nerve to induce thermal hyperalgesia and mechanical allodynia. Primary afferents in dermis after CCI exhibited progressive decreases, defined as partial cutaneous denervation; importantly, mGluR5 expressions in primary afferents were statistically increased. CCI-induced neuropathic pain behaviors through the intraplantar injections of 2-methyl-6-(phenylethynyl)-pyridine (MPEP), a selective mGluR5 antagonist, were dose-dependently attenuated. Furthermore, the most increased mGluR5 expressions in primary afferents surrounded by reactive Schwann cells were observed at the distal CCI stumps of sciatic nerves. In conclusion, these results suggest that nerve demyelination results in the increases of mGluR5 expression in injured primary afferents after CCI; and further suggest that mGluR5 represents a main therapeutic target in developing pharmacological strategies to prevent peripheral hypersensitivities. Full article
(This article belongs to the Special Issue Molecular and Cellular Mechanisms of Pain)
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Review

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1007 KiB  
Review
Mast Cell-Mediated Mechanisms of Nociception
by Anupam Aich, Lawrence B. Afrin and Kalpna Gupta
Int. J. Mol. Sci. 2015, 16(12), 29069-29092; https://doi.org/10.3390/ijms161226151 - 4 Dec 2015
Cited by 113 | Viewed by 20763
Abstract
Mast cells are tissue-resident immune cells that release immuno-modulators, chemo-attractants, vasoactive compounds, neuropeptides and growth factors in response to allergens and pathogens constituting a first line of host defense. The neuroimmune interface of immune cells modulating synaptic responses has been of increasing interest, [...] Read more.
Mast cells are tissue-resident immune cells that release immuno-modulators, chemo-attractants, vasoactive compounds, neuropeptides and growth factors in response to allergens and pathogens constituting a first line of host defense. The neuroimmune interface of immune cells modulating synaptic responses has been of increasing interest, and mast cells have been proposed as key players in orchestrating inflammation-associated pain pathobiology due to their proximity to both vasculature and nerve fibers. Molecular underpinnings of mast cell-mediated pain can be disease-specific. Understanding such mechanisms is critical for developing disease-specific targeted therapeutics to improve analgesic outcomes. We review molecular mechanisms that may contribute to nociception in a disease-specific manner. Full article
(This article belongs to the Special Issue Molecular and Cellular Mechanisms of Pain)
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