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Jubileum E, Binzen U, Treede RD, Greffrath W. Temporal and spatial summation of laser heat stimuli in cultured nociceptive neurons of the rat. Pflugers Arch 2022; 474:1003-1019. [PMID: 35867188 PMCID: PMC9393153 DOI: 10.1007/s00424-022-02728-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2022] [Revised: 07/04/2022] [Accepted: 07/05/2022] [Indexed: 12/04/2022]
Abstract
We studied the efficacy of a near-infrared laser (1475 nm) to activate rat dorsal root ganglion (DRG) neurons with short punctate radiant heat pulses (55 µm diameter) and investigated temporal and spatial summation properties for the transduction process for noxious heat at a subcellular level. Strength-duration curves (10–80 ms range) indicated a minimum power of 30.2mW for the induction of laser-induced calcium transients and a chronaxia of 13.9 ms. However, threshold energy increased with increasing stimulus duration suggesting substantial radial cooling of the laser spot. Increasing stimulus duration demonstrated suprathreshold intensity coding of calcium transients with less than linear gains (Stevens exponents 0.29/35mW, 0.38/60mW, 0.46/70mW). The competitive TRPV1 antagonist capsazepine blocked responses to short near-threshold stimuli and significantly reduced responses to longer duration suprathreshold heat. Heating 1/3 of the soma of a neuron was sufficient to induce calcium transients significantly above baseline (p < 0.05), but maximum amplitude was only achieved by centering the laser over the entire neuron. Heat-induced calcium increase was highest in heated cell parts but rapidly reached unstimulated areas reminiscent of spreading depolarization and opening of voltage-gated calcium channels. Full intracellular equilibrium took about 3 s, consistent with a diffusion process. In summary, we investigated transduction mechanisms for noxious laser heat pulses in native sensory neurons at milliseconds temporal and subcellular spatial resolution and characterized strength duration properties, intensity coding, and spatial summation within single neurons. Thermal excitation of parts of a nociceptor spread via both membrane depolarization and intracellular calcium diffusion.
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Affiliation(s)
- Elisabeth Jubileum
- Department of Neurophysiology, Mannheim Center for Translational Neuroscience (MCTN), Medical Faculty Mannheim, Heidelberg University, Ludolf-Krehl-Str. 13-17, 68167, Mannheim, Germany.,Department of Child and Adolescent Psychiatry, Psychotherapy and Psychosomatics, Rheinhessen Clinics, Hartmühlenweg 2-4, 55122, Mainz, Germany.,Department of Child and Adolescent Psychiatry and Psychotherapy, University Medical Center of the Johannes Gutenberg University, Langenbeckstraße 1, 55131, Mainz, Germany
| | - Uta Binzen
- Department of Neurophysiology, Mannheim Center for Translational Neuroscience (MCTN), Medical Faculty Mannheim, Heidelberg University, Ludolf-Krehl-Str. 13-17, 68167, Mannheim, Germany.,Department of Cardiovascular Physiology, European Center for Angioscience (ECAS), Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany
| | - Rolf-Detlef Treede
- Department of Neurophysiology, Mannheim Center for Translational Neuroscience (MCTN), Medical Faculty Mannheim, Heidelberg University, Ludolf-Krehl-Str. 13-17, 68167, Mannheim, Germany
| | - Wolfgang Greffrath
- Department of Neurophysiology, Mannheim Center for Translational Neuroscience (MCTN), Medical Faculty Mannheim, Heidelberg University, Ludolf-Krehl-Str. 13-17, 68167, Mannheim, Germany.
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Shimodaira T, Mikoshiba S, Taguchi T. Nonsteroidal anti-inflammatory drugs and acetaminophen ameliorate muscular mechanical hyperalgesia developed after lengthening contractions via cyclooxygenase-2 independent mechanisms in rats. PLoS One 2019; 14:e0224809. [PMID: 31693705 PMCID: PMC6834261 DOI: 10.1371/journal.pone.0224809] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2019] [Accepted: 10/22/2019] [Indexed: 01/04/2023] Open
Abstract
Nonsteroidal anti-inflammatory drugs and acetaminophen are cyclooxygenase inhibitors commonly used as symptomatic medicines for myofascial pain syndrome. Using the selective inhibitors celecoxib and zaltoprofen, cyclooxygenase-2 has been shown to be involved in the initiation, but not the maintenance, of muscular mechanical hyperalgesia induced by lengthening contractions, which serves as a useful model for the study of myofascial pain syndrome. The effect of other cyclooxygenase-2 inhibitors, such as acetylsalicylic acid, ibuprofen, loxoprofen sodium, and acetaminophen, on muscular mechanical hyperalgesia during maintenance has not been studied. Here, we examined the analgesic effects of the nonsteroidal anti-inflammatory drugs and acetaminophen on the model. Consistent with previous studies, mechanical withdrawal threshold of the muscle was significantly decreased and reached its lowest level 24 h after lengthening contractions. Celecoxib had no effect on muscular mechanical hyperalgesia, when orally administered 24 h after lengthening contractions. In contrast, acetylsalicylic acid, ibuprofen, loxoprofen sodium, and acetaminophen increased the withdrawal threshold, which had decreased by lengthening contractions, in a dose-dependent manner. These results demonstrate the analgesic actions of nonsteroidal anti-inflammatory drugs and acetaminophen in the maintenance process of lengthening contraction-induced muscular mechanical hyperalgesia, which may occur through cyclooxygenase-2 independent mechanisms.
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Affiliation(s)
| | - Shigeo Mikoshiba
- Pharmaceutical Research Laboratories, Lion Corporation, Odawara, Japan
| | - Toru Taguchi
- Department of Physical Therapy, Niigata University of Health and Welfare, Kita-ku, Niigata, Japan
- Institute for Human Movement and Medical Sciences, Niigata University of Health and Welfare, Kita-ku, Niigata, Japan
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Draelos ZD, Feldman SR, Berman B, Olivadoti M, Sierka D, Tallman AM, Zielinski MA, Ports WC, Baldwin S. Tolerability of Topical Treatments for Atopic Dermatitis. Dermatol Ther (Heidelb) 2019; 9:71-102. [PMID: 30680551 PMCID: PMC6380975 DOI: 10.1007/s13555-019-0280-7] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2018] [Indexed: 11/29/2022] Open
Abstract
Atopic dermatitis (AD) is a common inflammatory skin disease that is accompanied by increased sensitivity to itch-provoking and pain-provoking stimuli. Patients with AD experience skin pain before initiation of therapy and have also reported painful application site reactions in clinical trials of emollients and prescription topical therapies, including topical corticosteroids (TCSs), topical calcineurin inhibitors (TCIs), and a topical phosphodiesterase 4 (PDE4) inhibitor. To compare the sensory tolerability of prescription topical therapies for AD, a comprehensive literature search and analysis of published clinical trials was conducted. Sensory tolerability issues such as application site pain, burning, stinging, and pruritus were often among the most common adverse events or treatment-related adverse events in clinical trials for prescription topical therapies. Tolerability issues occurred at highest rates in trials of TCIs, followed by trials of the PDE4 inhibitor crisaborole and TCSs, although direct comparisons are not possible because of differences in study design. Tolerability issues in these clinical trials were generally mild to moderate and transient. This article also reviews published strategies for managing sensory tolerability issues in AD patients during treatment with topical therapies.Funding: Pfizer Inc., New York, NY.
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Affiliation(s)
- Zoe D Draelos
- Dermatology Consulting Services, High Point, NC, USA.
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Tsagareli M, Nozadze I, Tsiklauri N, Gurtskaia G. Non-steroidal anti-inflammatory drugs attenuate agonist-evoked activation of transient receptor potential channels. Biomed Pharmacother 2018; 97:745-751. [DOI: 10.1016/j.biopha.2017.10.131] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2017] [Revised: 10/02/2017] [Accepted: 10/23/2017] [Indexed: 02/02/2023] Open
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Maurer K, Binzen U, Mörz H, Treede RD, Greffrath W. Direkte Hemmung von TRPV1 durch Acetylsalicylsäure. Schmerz 2015; 29:223-6. [DOI: 10.1007/s00482-014-1492-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Maurer K, Binzen U, Mörz H, Bugert P, Schedel A, Treede RD, Greffrath W. Acetylsalicylic acid enhances tachyphylaxis of repetitive capsaicin responses in TRPV1-GFP expressing HEK293 cells. Neurosci Lett 2014; 563:101-6. [PMID: 24495935 DOI: 10.1016/j.neulet.2014.01.050] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2013] [Revised: 01/22/2014] [Accepted: 01/24/2014] [Indexed: 02/02/2023]
Abstract
Since many years acetylsalicylic acid (ASA) is known for its antithrombotic, antiphlogistic and analgesic effects caused by irreversible acetylation of cyclooxygenase. ASA also inhibits capsaicin- and heat-induced responses in cultured dorsal root ganglia (DRG) neurons, suggesting TRPV1 (transient receptor potential channel of the vanilloid receptor family, subtype 1) to be an additional target of ASA. We now studied the effect of ASA on heterologously expressed rat TRPV1 using calcium microfluorimetry. Capsaicin dose-dependently increased intracellular calcium with an EC50 of 0.29 μM in rTRPV1 expressing HEK293 cells. During repetitive stimulation the second response to capsaicin was reduced (53.4 ± 8.3% compared to vehicle control; p<0.005; Student's unpaired t-test) by 1μM ASA, a concentration much below the one needed to inhibit cyclooxygenase (IC50 of 35 μM in thromboxane B2 production assay). In contrast, calcium transients induced by a single stimulus of 0.3 or 1 μM capsaicin were not significantly reduced by 0.3 or 1 μM ASA. These data suggest that ASA increases the tachyphylaxis of rTRPV1 channel activation. Mechanisms are unknown and may be direct by e.g. stabilization of the desensitized state or indirect via inhibition of intracellular signaling pathways e.g. of the mitogen-activated protein kinase family (MAPK/ERK).
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Affiliation(s)
- Kristina Maurer
- Department of Neurophysiology, Centre for Biomedicine and Medical Technology Mannheim (CBTM), Medical Faculty Mannheim of the University of Heidelberg, Ludolf-Krehl-Str.13-17, D-68167 Mannheim, Germany
| | - Uta Binzen
- Department of Neurophysiology, Centre for Biomedicine and Medical Technology Mannheim (CBTM), Medical Faculty Mannheim of the University of Heidelberg, Ludolf-Krehl-Str.13-17, D-68167 Mannheim, Germany
| | - Handan Mörz
- Department of Neurophysiology, Centre for Biomedicine and Medical Technology Mannheim (CBTM), Medical Faculty Mannheim of the University of Heidelberg, Ludolf-Krehl-Str.13-17, D-68167 Mannheim, Germany
| | - Peter Bugert
- Institute of Transfusion Medicine and Immunology, Medical Faculty Mannheim of the University of Heidelberg, German Red Cross Blood Service of Baden-Württemberg-Hessen, Friedrich-Ebert-Straße 107, D-68167 Mannheim, Germany
| | - Angelika Schedel
- Institute of Transfusion Medicine and Immunology, Medical Faculty Mannheim of the University of Heidelberg, German Red Cross Blood Service of Baden-Württemberg-Hessen, Friedrich-Ebert-Straße 107, D-68167 Mannheim, Germany
| | - Rolf-Detlef Treede
- Department of Neurophysiology, Centre for Biomedicine and Medical Technology Mannheim (CBTM), Medical Faculty Mannheim of the University of Heidelberg, Ludolf-Krehl-Str.13-17, D-68167 Mannheim, Germany
| | - Wolfgang Greffrath
- Department of Neurophysiology, Centre for Biomedicine and Medical Technology Mannheim (CBTM), Medical Faculty Mannheim of the University of Heidelberg, Ludolf-Krehl-Str.13-17, D-68167 Mannheim, Germany.
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Abstract
Natural product ligands have contributed significantly to the deorphanisation of TRP ion channels. Furthermore, natural product ligands continue to provide valuable leads for the identification of ligands acting at "orphan" TRP channels. Additional naturally occurring modulators at TRP channels can be expected to be discovered in future, aiding in our understanding of not only their pharmacology and physiology, but also the therapeutic potential of this fascinating family of ion channels.
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Vincent AM, Backus C, Taubman AA, Feldman EL. Identification of candidate drugs for the treatment of ALS. ACTA ACUST UNITED AC 2009; 6:29-36. [PMID: 16036423 DOI: 10.1080/14660820510026171] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
A consortium of investigators interested in neurodegenerative diseases collaborated to screen 1040 drugs in multiple neurodegenerative disease assays. One model of amyotrophic lateral sclerosis (ALS) pathogenesis in particular incorporated glutamate exposure in enriched primary rat motor neuron cultures. In this model 78 compounds decreased motor neuron death caused by 100 microM glutamate. Almost all these pharmacological agents act at one or more of the following cellular targets: 1) protein synthesis inhibition; 2) Cox inhibition; 3) regulation of anion flux; 4) modulation of GABA receptors; 5) antioxidant, and 6) cell cycle inhibition. The most prevalent mode of action was the regulation of intracellular calcium. These data extend the understanding of motor neuron degeneration and identify a number of cellular targets for the improvement of combined therapies for neurodegenerative disease.
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Affiliation(s)
- Andrea M Vincent
- Department of Neorology, University of Michigan, Ann Arbor, Michigan, USA.
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Fonseca AS, Frydman JNG, Rocha VC, Bernardo-Filho M. Acetylsalicylic acid decreases the labeling of blood constituents with technetium-99M. ACTA BIOLOGICA HUNGARICA 2007; 58:187-98. [PMID: 17585508 DOI: 10.1556/abiol.58.2007.2.5] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Acetylsalicylic acid is the most widely used drug as antipyretic, analgesic, anti-inflammatory agent and for secondary prevention of thrombotic phenomena in the heart, brain and peripheral circulation. Drugs can modify the labeling of blood constituents with technetium-99m (99mTc). This work has evaluated the effect of in vivo treatment with acetylsalicylic acid on the in vitro labeling of the blood constituents with 99mTc. Wistar rats were treated with different doses (1.5, 3.0 and 6.0 mg/kg) of acetylsalicylic acid during 1 hour. At higher dose used (6.0 mg/kg) animals were treated during different period of time (0.25, 1.0 and 4.0 hours). Animals treated with physiologic saline solution were used as control. After the labeled process; plasma (P), blood cells (BC), insoluble (IF-P, IF-BC) and soluble (SF-P, SF-BC) fractions were separated. Afterwards, the percentage of radioactivity (%ATI) in each fraction was calculated. The treatment during 1 hour with acetylsalicylic acid at higher dose has significantly (p < 0.05) modified the fixation of 99mTc on blood cells. Considering the results, we suggest that acetylsalicylic acid used at therapeutic doses may interfere with the nuclear medicine procedures related to these blood constituents.
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Affiliation(s)
- A S Fonseca
- Departamento de Farmacologia e Psicobiologia, Universidade do Estado do Rio de Janeiro, Rio de Janeiro, Brasil.
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Rau KK, Jiang N, Johnson RD, Cooper BY. Heat sensitization in skin and muscle nociceptors expressing distinct combinations of TRPV1 and TRPV2 protein. J Neurophysiol 2007; 97:2651-62. [PMID: 17287441 DOI: 10.1152/jn.00840.2006] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Recordings were made from small and medium diameter dorsal root ganglia (DRG) neurons that expressed transient receptor potential (TRP) proteins. Physiologically characterized skin nociceptors expressed either TRPV1 (type 2) or TRPV2 (type 4) in isolation. Other nociceptors co-expressed both TRP proteins and innervated deep tissue sites (gastrocnemius muscle, distal colon; type 5, type 8) and skin (type 8). Subpopulations of myelinated (type 8) and unmyelinated (type 5) nociceptors co-expressed both TRPs. Cells that expressed TRPV1 were excellent transducers of intense heat. Proportional inward currents were obtained from a threshold of approximately 46.5 to approximately 56 degrees C. In contrast, cells expressing TRPV2 alone (52 degrees C threshold) did not reliably transduce the intensity of thermal events. Studies were undertaken to assess the capacity of skin and deep nociceptors to exhibit sensitization to repeated intense thermal stimuli [heat-heat sensitization (HHS)]. Only nociceptors that expressed TRPV2, alone or in combination with TRPV1, exhibited HHS. HHS was shown to be Ca(2+) dependent in either case. Intracellular Ca(2+) dependent pathways to HHS varied with the pattern of TRP protein expression. Cells co-expressing both TRPs modulated heat reactivity through serine/threonine phosphorylation or PLA(2)-dependent pathways. Cells expressing only TRPV2 may have relied on tyrosine kinases for HHS. We conclude that heat sensitization in deep and superficial capsaicin and capsaicin-insensitive C and Adelta nociceptors varies with the distribution of TRPV1 and TRPV2 proteins. The expression pattern of these proteins are specific to subclasses of physiologically identified C and A fiber nociceptors with highly restricted tissue targets.
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MESH Headings
- Animals
- Capsaicin/analogs & derivatives
- Capsaicin/pharmacology
- Colon/innervation
- Colon/metabolism
- Colon/physiology
- Histocytochemistry
- Hot Temperature
- Male
- Muscle, Skeletal/innervation
- Muscle, Skeletal/metabolism
- Muscle, Skeletal/physiology
- Muscle, Smooth/innervation
- Muscle, Smooth/metabolism
- Muscle, Smooth/physiology
- Muscles/innervation
- Muscles/metabolism
- Muscles/physiology
- Nerve Fibers, Myelinated/physiology
- Nerve Fibers, Unmyelinated/physiology
- Neurofilament Proteins/biosynthesis
- Neurons, Afferent/drug effects
- Nociceptors/metabolism
- Nociceptors/physiology
- Patch-Clamp Techniques
- Rats
- Rats, Sprague-Dawley
- Signal Transduction/physiology
- Skin/innervation
- Skin/metabolism
- TRPV Cation Channels/biosynthesis
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Affiliation(s)
- K K Rau
- Dept. of Oral Surgery and Diagnostic Sciences, Div. of Neuroscience, Box 100416, JHMHC, Univ. of Florida College of Dentistry, Gainesville, FL 32610, USA
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